ESS VT2-500 Supercharger Kit Installed! Impressions, pictures, video.

iPhoneEngineer · 07-23-2011, 02:56 AM

Boost gauge ordered with 1-day shipping, due on Monday. Kinda ridiculous that the lowest maximum for mechanical gauges seems to be 20PSI; electrical sender ones come in 15PSI, but 10 would be best for us to have the biggest visible range.

Beedub · 07-23-2011, 04:36 AM

Best decision u could have made......
Fyi, i temp mounted mine between tge dials, a normal 52mm gauge fits between them nice n snugly, i then left the window slightly open and straight to the rear vaccum line, the one the bov uses ;-) once uve finished testing, throw this in thr glove box and forget about it..... Very nice way to quickly test boost without having to pay 0000s for gauges n pods.....

Let me now after uve dun ur testing........

Beedub · 07-24-2011, 01:20 PM

iphone i had a real chance to test my kit in different circumstance and report back to you.....

my s/c has gotten alot quieter now during operation, low revs see's some sc noise, at idle it sounds rattly, but not excessively, its a very mecanial whheeerrrrrrrrrrrrrrrrr noise, its sounds lovely in harmony with the s54's engine note..

now traction..... today was 25 deg C, nice and warm tarmac, traction control left on and i can 100% tell you the traction light flashes pretty much all the way through second and sometimes into the change into third..... progess is hindered to the point where the car is undriveable...... so to confirm with Pss and a 265 rear tyre.

i see 7.3ishpsi boost @ 7300 rpm and 8psi @ 7900

i see 11.5ish AFR at redline.....

tuning is bang on, no wavering, no vibrations, just solid power throughout the rev range. looking forward to seeing what your boost tests show........

iPhoneEngineer · 07-25-2011, 12:35 AM

So I've done a fair bit more driving with the kit. Some notes:

1) There's no way I'm making full power. The car is definitively more powerful than before, but it's not nearly the "no comparison" difference it should be. I drove a new 650i for 20 minutes (alone) as part of the BMW Drive event for the Olympics; the TT V8 obviously has plenty of torque, but with "only" 400HP it could move 4,700lbs pretty effectively. I really pushed the car hard, and while I know mine is clearly faster (the 650 has a similar 0-60 as the stock M Coupe), it is NOT the sort of completely landslide difference I would expect when comparing the stats of 400HP / 4700lbs to 500HP / 3200lbs. I've tried traction control on or off; no blinking light, no spinning tires even in 1st gear, WOT to 7,500RPM.
2) The rear of the car has begun to collect a fine soot, after just a couple hundred miles since the pulley replacement. The car was washed shortly before then, and then washed again by HG Motorsports who did the replacement. I can draw a line on the bumper and collect it on my finger. Clearly running rich--when my Supra Turbo was out of tune, it was even worse, but another indication that there's at least one more problem. I've been doing a lot of highway and usual driving; a fair number of WOT pulls, but it's not like I've done 200 miles of city with WOT from every light, lol.
3) While the car is quite drivable, there are still areas where the tune is noticeably off while driving. Once I mashed the throttle at only ~1,500RPM in 2nd and the car hesitated, then bucked pretty violently before recovering. Also part-throttle deceleration still seems to be a weakness with occasional jerks or popping from the exhaust side.

To be clear I'm pretty sure all of these are caused by the same 1-2 issues, most likely a pretty sizable boost leak which gets significantly worse at higher boost. Maybe a clamp slipped since Chris tested it at 6.5PSI. My boost gauge arrives tomorrow morning and I will report back, of course

.

While a bit disappointing, I'm less worried about these issues and based on their response in handling the pulley issue, am confident ESS will work with me to ensure the kit is performing as expected. I'm really hoping the problem is boost and excited to see the full potential!

This is a very complicated kit, and coming from a built Supra, it is honestly amazing that big power like this can be truly bolt-on and problem-free in final installation without even an ECU piggyback.

Beedub · 07-25-2011, 02:01 AM

Quote:

Originally Posted by iPhoneEngineer

So I've done a fair bit more driving with the kit. Some notes:

1) There's no way I'm making full power. The car is definitively more powerful than before, but it's not nearly the "no comparison" difference it should be. I drove a new 650i for 20 minutes (alone) as part of the BMW Drive event for the Olympics; the TT V8 obviously has plenty of torque, but with "only" 400HP it could move 4,700lbs pretty effectively. I really pushed the car hard, and while I know mine is clearly faster (the 650 has a similar 0-60 as the stock M Coupe), it is NOT the sort of completely landslide difference I would expect when comparing the stats of 400HP / 4700lbs to 500HP / 3200lbs. I've tried traction control on or off; no blinking light, no spinning tires even in 1st gear, WOT to 7,500RPM.
2) The rear of the car has begun to collect a fine soot, after just a couple hundred miles since the pulley replacement. The car was washed shortly before then, and then washed again by HG Motorsports who did the replacement. I can draw a line on the bumper and collect it on my finger. Clearly running rich--when my Supra Turbo was out of tune, it was even worse, but another indication that there's at least one more problem. I've been doing a lot of highway and usual driving; a fair number of WOT pulls, but it's not like I've done 200 miles of city with WOT from every light, lol.
3) While the car is quite drivable, there are still areas where the tune is noticeably off while driving. Once I mashed the throttle at only ~1,500RPM in 2nd and the car hesitated, then bucked pretty violently before recovering. Also part-throttle deceleration still seems to be a weakness with occasional jerks or popping from the exhaust side.

To be clear I'm pretty sure all of these are caused by the same 1-2 issues, most likely a pretty sizable boost leak which gets significantly worse at higher boost. Maybe a clamp slipped since Chris tested it at 6.5PSI. My boost gauge arrives tomorrow morning and I will report back, of course

.

While a bit disappointing, I'm less worried about these issues and based on their response in handling the pulley issue, am confident ESS will work with me to ensure the kit is performing as expected. I'm really hoping the problem is boost and excited to see the full potential!

This is a very complicated kit, and coming from a built Supra, it is honestly amazing that big power like this can be truly bolt-on and problem-free in final installation without even an ECU piggyback.

definatly, very complicated and will be trouble free once youve sorted these niggles.... im guessing you have a slight boost leak thats blowing open @ WOT, cant wait really to see what your seeing boost wise....... email Ess and talk to them about a resolution, these guys WILL work your issues with you..

Re the bucking your feeling, let me guess, low revs high gear situation??? so say flat to the floor in 5th gear at like 35mph ;-) if you want that to dissappear you need ESS to send you the less aggressive vanos timing, :-)

please report re your boost.

Beedub · 07-25-2011, 01:01 PM

iphone????? updates on boost testing???

ZStig · 07-25-2011, 01:54 PM

Are you getting any error codes from the computer?

Beedub · 07-25-2011, 04:40 PM

any updates on boost testing iphone??

iPhoneEngineer · 07-25-2011, 05:37 PM

Hahah Beedub, I love your enthusiasm

. Keeps me going when the kit has been frustrating. I hadn't checked the thread but it's taken me a while to edit the video I took of the boost gauge and tachometer, which is undergoing the agonizing upload process on my grandma's internet connection.

The results show that boost is low by at least ~2PSI, not 0.5PSI. Here's a still shot of one of the clearest redline pulls:

As soon as I shift the boost gauge spikes another 2PSI, but it seems pretty clearly related to the actuation of the BPV since the change is instantaneous, occurring between the 30fps frames (shoot, I should've set the GoPro to 60fps). I will post the video when it is done uploading.

In addition to the ~5PSI boost at redline, boost is quite low at lower RPMs even at WOT. At 4kRPM in 3rd at WOT, the gauge reads pretty near 0! I need input from the other VT2-500 guys to know how much of this is normal for a centrifugal supercharger since I'm only used to turbos.

iPhoneEngineer · 07-25-2011, 09:16 PM

This video includes many examples of not just 1st and 2nd gear WOT to redline, but also vacuum at deceleration, and vacuum at idle with and without A/C running (vacuum was not as strong running the A/C due to the additional engine load opening the throttles slightly).

Beedub · 07-26-2011, 03:08 AM

iphone something is Really wierd here....... you need to send these video clips to ESS.
you either have a serious boost leak or...... the only other explaination is the wrong S/C pulley, my VT1 with its 5psi pulley made boost almost identically to how your VT2 kits making boost....my vt2 is around 3900-4000 im seeing between 1.5-2psi, by redline i see betweem 7.5-8psi, you kit is boosting in exactly the same way my vt1 did..... which was a 5psi pulley.

now im seeing your vacuum which is nice and strong, great figure, you either have a monumental boost leak under boost or the pullies wrong, Ess now need to take this car in and re-check things imo...... according you your boost gauge your running vt1 power so 445, your basically missing 60hp which is right in line with the alot Quicker than stock but not mind blowing performance you commented on......

iphone their are so many places where this boost pipework is butted up against sharp items in the engine bay, i think you may have a boost leak if the pully is around 85mm, something isnt holding pressure right...... im SOOOOO GLAD you did what i told you Re a boost gauge as i felt from your description that you wasnt getting the proper boost, now with this video ESS HAVE to act, youve got this installed at a reputable ess installer, you've done all you can do bro..... this needs proper testing....

things that need checking..... all boost pipes and clamps as they break very easily.
BPV for leaks
Complete intake system pressure/smoke tested
check s/c pulley size

Honestly????? i think the complete boost pipework needs to come off the car and be inspected thoroughly then re-installed..... 5psi is simply not exceptable, 6.5 is a fair trade off on a 7psi pulley but your getting vt1 peformance...... ESS will help you but you really need to speak to them and show them that video, thats pretty much answered your issue...... this will more than likely explain some tune issues your having as its not running as it should be.

...... im just wishing i was in the usa, id be straight round your house working this out with you, especially as my comments have directly led you to get this kit, im really gutted your having so many issues...... having taken off the boost pipe work myself on my own VT2 their is a lot of clips, i even found a broken installed that the tuner bust and lazily put back on ;-) what youve done now iphone is youve isolated your issue to boost......... now the real fault finding can begin. i still believe ALOT of this is done to a poor install as any self worthy shop should test boost and fault find imo....

Beedub · 07-26-2011, 03:11 AM

btw the temp routing of you Boost gauge was perfect, exactly how i had mine, test where your testing as well shows you a true "manifold" pressure which is what your engine see's :-)

great video BTW, very clear and shows clearly their is an issue, with this ESS will be able to see for themself whats the issue is :-) well done.

Beedub · 07-26-2011, 03:17 AM

iphone ive found a GREAT clip for you showing some real clear boost situtations, this is a clip of a v8 m3 using a 7psi pulley..... this partiular car makes on 6.6psi @ redline, now matter thats fine, in other conditions it will most likely be very close to 7psi.........
note vaccum figures, also not where boost starts, 1.5-2psi @ 3500-4000rpm exactly like i said earlier... my boost building looks very similar to this except i see a solid 2.25ish psi @ 4000 rpm..... great clip for you here and this shows how slow your boost is rising, bear in mind the v8 uses the same v3si, this is also a 7psi pulley

iPhoneEngineer · 07-26-2011, 05:01 PM

I tried twice to post from the road, but the Bimmerpost app wasn't getting the message through...anyway, I'm back home to NorCal.

ESS says they want me to get a dyno with boost and AFR to move forward, despite my efforts making a clear video.

I'm going to be a frantically busy guy getting back to work after a week and a half, so with the nearest quality dyno 45 mins away, I'm not sure it seems necessary. Alekshop is also a fair drive, but nonetheless I'm going to try to diagnose and fix the issue ASAP.

iPhoneEngineer · 07-26-2011, 08:13 PM

"Great" news--I finally had a chance to check the size of the pulley (it was busy in SoCal). It appears to be clear over 100mm, between 105mm and 110mm as far as I can tell. However, it is quite difficult to measure accurately because the bolt in the center blocks all lengths across the diameter from sitting flush with the edges of the pulley.

How large is the VT1-445 pulley? Since a larger pulley would indeed result in a slower compressor blade spin and less boost, it would appear to be confirmed that I simply have the wrong S/C pulley.

iPhoneEngineer · 07-26-2011, 08:15 PM

Quote:

Originally Posted by Roffle Waffle

Are you getting any error codes from the computer?

I have never had a persistent SES light; not even after the Active Autowerke headers.

Beedub · 07-27-2011, 01:56 AM

Quote:

Originally Posted by iPhoneEngineer

I tried twice to post from the road, but the Bimmerpost app wasn't getting the message through...anyway, I'm back home to NorCal.

ESS says they want me to get a dyno with boost and AFR to move forward, despite my efforts making a clear video.

I'm going to be a frantically busy guy getting back to work after a week and a half, so with the nearest quality dyno 45 mins away, I'm not sure it seems necessary. Alekshop is also a fair drive, but nonetheless I'm going to try to diagnose and fix the issue ASAP.

i dont agree with ESS's approach, they need to understand we all dont live next door to these shop and have jobs :-( im sure they want clear cut results, business wise i understand that decision....... i believe my pully is 85mm??? as son as i get in this evening ill check and post back :-)

were getting closer iphone :-)

ZStig · 07-27-2011, 10:01 AM

I'd also check the height of the bolt thats adjustable on the bypass valve, and post the measurement here for us to compare. My friend's VT625 e92 m3 was getting low boost, so we tried my bypass valve, and it hit 5psi instead of only 2psi it was getting before. (I'm still hunting down my 02 sensor problem)

Beedub · 07-27-2011, 04:21 PM

right ive literally just come in from measureing the pulley, mine measures around 83-84mm MAX, thats leaving room for slight error also... its closer to 83mm, i think weve found your problem...... if your pulley is indeed 100mm, thats the vt1 pulley :-)

Get ess to get you a vt2 pulley asap... are you SURE your pulley is 100mm????

it seems...... iphone weve worked out your issue....

glad ive been able to help....... now go get your 60+hp!!!!! lol

iPhoneEngineer · 07-27-2011, 04:50 PM

Quote:

Originally Posted by Beedub

Get ess to get you a vt2 pulley asap... are you SURE your pulley is 100mm????

Heh, I just double-checked my measurements by doing a circumference with a strip of paper around the pulley and dividing by pi. I discovered the ruler I had lying around was in fact marked in thirds of an inch, not centimeters, so it's all wrong.

I can confirm that my pulley is in fact around 83mm based on both an inch ruler direct estimated diameter measurement, and the circumference approach (also using a clear inch-demarked ruler). So, the issue is still at large.

iPhoneEngineer · 07-27-2011, 05:19 PM

As a side note, I now have on order the same IC pipe elbow that Roffle Waffle found fits his car perfectly, in contrast to the ESS-provided one that seems to be too short for the E85/E86 install (a few different installers have commented on this fit issue).

I know next to nothing about adjusting BPVs, but was still surprised to see that the nut on mine is tightened all the way down. Chris said smoke testing revealed it was one of two boost leaks and apparently they think this is the right position for the nut, but the number of threads it has indicates to me that there is probably room for debate on that. Beedub, Roffle--what are the positions of your BPV nut?

iPhoneEngineer · 07-27-2011, 09:44 PM

I'm signed up for a boost+AFR dyno (on a DynoJet) at 11AM tomorrow; looking forward to some official and comprehensive results despite the drive and additional expense. It may be a couple hours before I can post the results since I'll be at work.

07-23-2011, 02:56 AM	#111
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	Boost gauge ordered with 1-day shipping, due on Monday. Kinda ridiculous that the lowest maximum for mechanical gauges seems to be 20PSI; electrical sender ones come in 15PSI, but 10 would be best for us to have the biggest visible range.
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07-23-2011, 04:36 AM	#112
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	Best decision u could have made...... Fyi, i temp mounted mine between tge dials, a normal 52mm gauge fits between them nice n snugly, i then left the window slightly open and straight to the rear vaccum line, the one the bov uses ;-) once uve finished testing, throw this in thr glove box and forget about it..... Very nice way to quickly test boost without having to pay 0000s for gauges n pods..... Let me now after uve dun ur testing........ __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-24-2011, 01:20 PM	#113
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	iphone i had a real chance to test my kit in different circumstance and report back to you..... my s/c has gotten alot quieter now during operation, low revs see's some sc noise, at idle it sounds rattly, but not excessively, its a very mecanial whheeerrrrrrrrrrrrrrrrr noise, its sounds lovely in harmony with the s54's engine note.. now traction..... today was 25 deg C, nice and warm tarmac, traction control left on and i can 100% tell you the traction light flashes pretty much all the way through second and sometimes into the change into third..... progess is hindered to the point where the car is undriveable...... so to confirm with Pss and a 265 rear tyre. i see 7.3ishpsi boost @ 7300 rpm and 8psi @ 7900 i see 11.5ish AFR at redline..... tuning is bang on, no wavering, no vibrations, just solid power throughout the rev range. looking forward to seeing what your boost tests show........ __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-25-2011, 12:35 AM	#114
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	So I've done a fair bit more driving with the kit. Some notes: 1) There's no way I'm making full power. The car is definitively more powerful than before, but it's not nearly the "no comparison" difference it should be. I drove a new 650i for 20 minutes (alone) as part of the BMW Drive event for the Olympics; the TT V8 obviously has plenty of torque, but with "only" 400HP it could move 4,700lbs pretty effectively. I really pushed the car hard, and while I know mine is clearly faster (the 650 has a similar 0-60 as the stock M Coupe), it is NOT the sort of completely landslide difference I would expect when comparing the stats of 400HP / 4700lbs to 500HP / 3200lbs. I've tried traction control on or off; no blinking light, no spinning tires even in 1st gear, WOT to 7,500RPM. 2) The rear of the car has begun to collect a fine soot, after just a couple hundred miles since the pulley replacement. The car was washed shortly before then, and then washed again by HG Motorsports who did the replacement. I can draw a line on the bumper and collect it on my finger. Clearly running rich--when my Supra Turbo was out of tune, it was even worse, but another indication that there's at least one more problem. I've been doing a lot of highway and usual driving; a fair number of WOT pulls, but it's not like I've done 200 miles of city with WOT from every light, lol. 3) While the car is quite drivable, there are still areas where the tune is noticeably off while driving. Once I mashed the throttle at only ~1,500RPM in 2nd and the car hesitated, then bucked pretty violently before recovering. Also part-throttle deceleration still seems to be a weakness with occasional jerks or popping from the exhaust side. To be clear I'm pretty sure all of these are caused by the same 1-2 issues, most likely a pretty sizable boost leak which gets significantly worse at higher boost. Maybe a clamp slipped since Chris tested it at 6.5PSI. My boost gauge arrives tomorrow morning and I will report back, of course . While a bit disappointing, I'm less worried about these issues and based on their response in handling the pulley issue, am confident ESS will work with me to ensure the kit is performing as expected. I'm really hoping the problem is boost and excited to see the full potential! This is a very complicated kit, and coming from a built Supra, it is honestly amazing that big power like this can be truly bolt-on and problem-free in final installation without even an ECU piggyback. Last edited by iPhoneEngineer; 07-25-2011 at 01:04 AM..
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07-25-2011, 01:01 PM	#116
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	iphone????? updates on boost testing??? __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-25-2011, 01:54 PM	#117
ZStig instagram 997turbotom 279 Rep 7,377 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	Are you getting any error codes from the computer? __________________
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07-25-2011, 04:40 PM	#118
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	any updates on boost testing iphone?? __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-25-2011, 05:37 PM	#119
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	Hahah Beedub, I love your enthusiasm . Keeps me going when the kit has been frustrating. I hadn't checked the thread but it's taken me a while to edit the video I took of the boost gauge and tachometer, which is undergoing the agonizing upload process on my grandma's internet connection. The results show that boost is low by at least ~2PSI, not 0.5PSI. Here's a still shot of one of the clearest redline pulls: As soon as I shift the boost gauge spikes another 2PSI, but it seems pretty clearly related to the actuation of the BPV since the change is instantaneous, occurring between the 30fps frames (shoot, I should've set the GoPro to 60fps). I will post the video when it is done uploading. In addition to the ~5PSI boost at redline, boost is quite low at lower RPMs even at WOT. At 4kRPM in 3rd at WOT, the gauge reads pretty near 0! I need input from the other VT2-500 guys to know how much of this is normal for a centrifugal supercharger since I'm only used to turbos.
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07-25-2011, 09:16 PM	#120
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	This video includes many examples of not just 1st and 2nd gear WOT to redline, but also vacuum at deceleration, and vacuum at idle with and without A/C running (vacuum was not as strong running the A/C due to the additional engine load opening the throttles slightly).
	Appreciate 0 Quote

07-26-2011, 03:08 AM	#121
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	iphone something is Really wierd here....... you need to send these video clips to ESS. you either have a serious boost leak or...... the only other explaination is the wrong S/C pulley, my VT1 with its 5psi pulley made boost almost identically to how your VT2 kits making boost....my vt2 is around 3900-4000 im seeing between 1.5-2psi, by redline i see betweem 7.5-8psi, you kit is boosting in exactly the same way my vt1 did..... which was a 5psi pulley. now im seeing your vacuum which is nice and strong, great figure, you either have a monumental boost leak under boost or the pullies wrong, Ess now need to take this car in and re-check things imo...... according you your boost gauge your running vt1 power so 445, your basically missing 60hp which is right in line with the alot Quicker than stock but not mind blowing performance you commented on...... iphone their are so many places where this boost pipework is butted up against sharp items in the engine bay, i think you may have a boost leak if the pully is around 85mm, something isnt holding pressure right...... im SOOOOO GLAD you did what i told you Re a boost gauge as i felt from your description that you wasnt getting the proper boost, now with this video ESS HAVE to act, youve got this installed at a reputable ess installer, you've done all you can do bro..... this needs proper testing.... things that need checking..... all boost pipes and clamps as they break very easily. BPV for leaks Complete intake system pressure/smoke tested check s/c pulley size Honestly????? i think the complete boost pipework needs to come off the car and be inspected thoroughly then re-installed..... 5psi is simply not exceptable, 6.5 is a fair trade off on a 7psi pulley but your getting vt1 peformance...... ESS will help you but you really need to speak to them and show them that video, thats pretty much answered your issue...... this will more than likely explain some tune issues your having as its not running as it should be. ...... im just wishing i was in the usa, id be straight round your house working this out with you, especially as my comments have directly led you to get this kit, im really gutted your having so many issues...... having taken off the boost pipe work myself on my own VT2 their is a lot of clips, i even found a broken installed that the tuner bust and lazily put back on ;-) what youve done now iphone is youve isolated your issue to boost......... now the real fault finding can begin. i still believe ALOT of this is done to a poor install as any self worthy shop should test boost and fault find imo.... __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-26-2011, 03:11 AM	#122
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	btw the temp routing of you Boost gauge was perfect, exactly how i had mine, test where your testing as well shows you a true "manifold" pressure which is what your engine see's :-) great video BTW, very clear and shows clearly their is an issue, with this ESS will be able to see for themself whats the issue is :-) well done. __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-26-2011, 03:17 AM	#123
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	iphone ive found a GREAT clip for you showing some real clear boost situtations, this is a clip of a v8 m3 using a 7psi pulley..... this partiular car makes on 6.6psi @ redline, now matter thats fine, in other conditions it will most likely be very close to 7psi......... note vaccum figures, also not where boost starts, 1.5-2psi @ 3500-4000rpm exactly like i said earlier... my boost building looks very similar to this except i see a solid 2.25ish psi @ 4000 rpm..... great clip for you here and this shows how slow your boost is rising, bear in mind the v8 uses the same v3si, this is also a 7psi pulley __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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07-26-2011, 05:01 PM	#124
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	I tried twice to post from the road, but the Bimmerpost app wasn't getting the message through...anyway, I'm back home to NorCal. ESS says they want me to get a dyno with boost and AFR to move forward, despite my efforts making a clear video. I'm going to be a frantically busy guy getting back to work after a week and a half, so with the nearest quality dyno 45 mins away, I'm not sure it seems necessary. Alekshop is also a fair drive, but nonetheless I'm going to try to diagnose and fix the issue ASAP.
	Appreciate 0 Quote

07-26-2011, 08:13 PM	#125
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	"Great" news--I finally had a chance to check the size of the pulley (it was busy in SoCal). It appears to be clear over 100mm, between 105mm and 110mm as far as I can tell. However, it is quite difficult to measure accurately because the bolt in the center blocks all lengths across the diameter from sitting flush with the edges of the pulley. How large is the VT1-445 pulley? Since a larger pulley would indeed result in a slower compressor blade spin and less boost, it would appear to be confirmed that I simply have the wrong S/C pulley.
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07-27-2011, 10:01 AM	#128
ZStig instagram 997turbotom 279 Rep 7,377 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	I'd also check the height of the bolt thats adjustable on the bypass valve, and post the measurement here for us to compare. My friend's VT625 e92 m3 was getting low boost, so we tried my bypass valve, and it hit 5psi instead of only 2psi it was getting before. (I'm still hunting down my 02 sensor problem) __________________
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07-27-2011, 04:21 PM	#129
Beedub Major General 423 Rep 5,328 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	right ive literally just come in from measureing the pulley, mine measures around 83-84mm MAX, thats leaving room for slight error also... its closer to 83mm, i think weve found your problem...... if your pulley is indeed 100mm, thats the vt1 pulley :-) Get ess to get you a vt2 pulley asap... are you SURE your pulley is 100mm???? it seems...... iphone weve worked out your issue.... glad ive been able to help....... now go get your 60+hp!!!!! lol __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com Last edited by Beedub; 07-27-2011 at 04:39 PM..
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07-27-2011, 05:19 PM	#131
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	As a side note, I now have on order the same IC pipe elbow that Roffle Waffle found fits his car perfectly, in contrast to the ESS-provided one that seems to be too short for the E85/E86 install (a few different installers have commented on this fit issue). I know next to nothing about adjusting BPVs, but was still surprised to see that the nut on mine is tightened all the way down. Chris said smoke testing revealed it was one of two boost leaks and apparently they think this is the right position for the nut, but the number of threads it has indicates to me that there is probably room for debate on that. Beedub, Roffle--what are the positions of your BPV nut?
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07-27-2011, 09:44 PM	#132
iPhoneEngineer Lieutenant 43 Rep 476 Posts Drives: 2007 BMW Z4 M Coupe Join Date: Jun 2010 Location: La Honda, CA iTrader: (2)	I'm signed up for a boost+AFR dyno (on a DynoJet) at 11AM tomorrow; looking forward to some official and comprehensive results despite the drive and additional expense. It may be a couple hours before I can post the results since I'll be at work.
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