FI options for Z4M: VT2-500 with water injection, other kits?

[iPhoneEngineer]

Has anyone heard of a version of the VT kits with a blow off valve instead of a bypass? I ran across this:

http://forum.e46fanatics.com/showpos...6&postcount=51

I would absolutely love a BOV, seeing as I came from a Supra Turbo and really miss the sound! Aside from that, recirculating air that was heated through the supercharger seems like a bad idea for the quality of the charge that first gets ingested after completing a shift.

[Beedub]

its all personal opinion but i genuinely dont see the need, the s/c noise itsself is pretty cool, @ 8psi its not moving a crazy amount of air and i personally want any charge air dumped straight back into my s/c so it can be cooled to get back into my motor.....

That Si trim unit is a Very large unit for the s54 to spin up so every last drop of air helps.

Again not going to make a massive difference eitherway i dont think, it's very audile recircing tbh....

[Beedub]

VT2-550 is now available guys!!! some really nice fuel mods as well with the 550.....

[iPhoneEngineer]

Originally Posted by Beedub

VT2-550 is now available guys!!! some really nice fuel mods as well with the 550.....

Oooh! Can you link us to further details? It's disappointing that even the VT2-500 (for Z4M) isn't seen on esstuning.com for parts list comparisons to the VT1-445.

[iPhoneEngineer]

Originally Posted by Beedub

its all personal opinion but i genuinely dont see the need, the s/c noise itsself is pretty cool, @ 8psi its not moving a crazy amount of air and i personally want any charge air dumped straight back into my s/c so it can be cooled to get back into my motor.....

That Si trim unit is a Very large unit for the s54 to spin up so every last drop of air helps.

Again not going to make a massive difference eitherway i dont think, it's very audile recircing tbh....

1) I wish I had a system map of the VT2-500...does the recirculation bridge from the intake manifold to just /after/ the supercharger, so it goes back through the FMIC?
2) Since the supercharger is always spinning in direct relation to engine RPM, does the recirculation actually save the engine any recompression effort? I would imagine if the pressure is lower in the post-supercharger piping (and FMIC) due to the BOV releasing it, it would actually require less power to run the supercharger at that speed until the pressure is regained.
3) Do you have any recordings of your setup? I haven't found many good ones on youtube, most are only with the car stationary and revving.

[iPhoneEngineer]

AJ got back to me and confirmed that a BOV is an available kit option! He does not know offhand the make or model of the BOV, though the BPV is from Vortech.

The decision to go with a BOV is obviously motivated entirely by the sound--what I'm used to and would like to get back! I'll have to shift quick if I want to maintain most of the pressure between shifts, but because the supercharger is fixed to engine RPM, I'm not that worried about the amount of time it will take to rebuild boost in the manifold after the throttle plates open again and shut off the BOV.

[Beedub]

Originally Posted by iPhoneEngineer

Oooh! Can you link us to further details? It's disappointing that even the VT2-500 (for Z4M) isn't seen on esstuning.com for parts list comparisons to the VT1-445.

vt2-500 isnt the easiest of install and requires someone that really knows their shizzle, this is why ess dont want to release to the general public, their authorized installers will handle this no probs... VT2 -550 will require further fuel mods and maybe a new fuel rail.... i believe its 9-10psi which is imo just alitte over where id want to take a stock high compression motor....

getting 500rwhp without adding further boost on the vt-500 is easily done, thats the way im going..... hell we get another 40rwhp from just water/meth injection as a charge cooling method.

[Beedub]

Originally Posted by iPhoneEngineer

1) I wish I had a system map of the VT2-500...does the recirculation bridge from the intake manifold to just /after/ the supercharger, so it goes back through the FMIC?
2) Since the supercharger is always spinning in direct relation to engine RPM, does the recirculation actually save the engine any recompression effort? I would imagine if the pressure is lower in the post-supercharger piping (and FMIC) due to the BOV releasing it, it would actually require less power to run the supercharger at that speed until the pressure is regained.
3) Do you have any recordings of your setup? I haven't found many good ones on youtube, most are only with the car stationary and revving.

1) the recirced air is 100% compressed and cooled again before entering the engine again......
2) maybe not too sure
3) ther are plenty of vids with my vt1, not the new setup.

[Beedub]

Originally Posted by iPhoneEngineer

AJ got back to me and confirmed that a BOV is an available kit option! He does not know offhand the make or model of the BOV, though the BPV is from Vortech.

The decision to go with a BOV is obviously motivated entirely by the sound--what I'm used to and would like to get back! I'll have to shift quick if I want to maintain most of the pressure between shifts, but because the supercharger is fixed to engine RPM, I'm not that worried about the amount of time it will take to rebuild boost in the manifold after the throttle plates open again and shut off the BOV.

again imo i want the best for performance...... recircing the air is best in thisv application

[Beedub]

Originally Posted by iPhoneEngineer

Oooh! Can you link us to further details? It's disappointing that even the VT2-500 (for Z4M) isn't seen on esstuning.com for parts list comparisons to the VT1-445.

550 uses 9psi..... upgraded Ess spec fuel supply/pressure system...

other than that its a simply pulley, tune, new fuel pump and maybe uprated fuel rail.......

you might be lucky and get an 8psi pulley like i did!! report back when you recieve you kit, please make sure your shop do boost logs.... im really interested to see what your hitting with your vt2...

[ZStig]

any website links to VT2-550?

[Beedub]

Originally Posted by Roffle Waffle

any website links to VT2-550?

http://www.esstuning.com/products/E4...8Gen.2%29.html

z4m pricing is usually a good bit more with the more complicated tuning involved ..............

VT2-500 with the 8psi i see is more than enough for another year....

then its time to get serious..... fully built motor and VT3...

[ZStig]

Did you notice a big difference over stock for 6th gear performance? Particularly at highway speeds of around 125kph

[Beedub]

Originally Posted by Roffle Waffle

Did you notice a big difference over stock for 6th gear performance? Particularly at highway speeds of around 125kph

ermm difficult one.... @ motorway crusing the blower is just.... just... tickling around 0.5-1 psi so it definatly feels quicker, not massively so at this boost but definatly enough to feel a shove and not need to change down..........

@ motorway cruising speeds with around 1 psi showing, mpg is the same and in some circumstance is better with a gentle 0.5-1psi just gently helping the motor along.....

[ZStig]

eh, I guess I can't expect it to do everything

[Tiago]

You can put the vortech BPV blowing into atmosphere after blocking the inlet in the manifold. The idle will be rough at the beginning till the ECU adapt and then it will be fine because ESS intake sensor only reads AIT.

[Tiago]

A question for you: If you really are considering W/M kit, and since it drop dramatically the air temps, then why not put the intake filter attached to the S/C, like AA did with HKS kit? Maros, that has a custom ESS CFR kit (ASA TM-21 with low compression - 680hp) also has the filter like this. The S/C will make much less effort to suck air and it will be cooler with the IC and W/M injection. This will only works when converting the BPV to VTA or replace it with a BOV.

Go to 1:35m

[Beedub]

no way would i stick a filter directly on the back of my s/c unit, it will be sucking in proper warm air, where ESS currently locate the intake it gets a proper cold air supply isolated from the engine, its grill mounted, ESS clearly spent money getting that intake right, seems silly to bin it and just stick a filter on the back of the unit, ess could have asily and saved alot of money releasing the kit like this, imo its say alot they didnt ;-)

[Tiago]

Originally Posted by Beedub

no way would i stick a filter directly on the back of my s/c unit, it will be sucking in proper warm air, where ESS currently locate the intake it gets a proper cold air supply isolated from the engine, its grill mounted, ESS clearly spent money getting that intake right, seems silly to bin it and just stick a filter on the back of the unit, ess could have asily and saved alot of money releasing the kit like this, imo its say alot they didnt ;-)

ESS has a amazing IC and with meth, the air it will be even cooler that with the current system. Thus, the SC will breath better, it will be easier to take off the filter and clean, and you don't have to worry anymore with heavy rain days or jet wash the front of the car. But the true benefit it will be to get room for the meth tank...

[Beedub]

Originally Posted by Tiago

ESS has a amazing IC and with meth, the air it will be even cooler that with the current system. Thus, the SC will breath better, it will be easier to take off the filter and clean, and you don't have to worry anymore with heavy rain days or jet wash the front of the car. But the true benefit it will be to get room for the meth tank...

ok if you wish to free room then maybe BUT... i for one dont drive this vehcile as a daily drive, its used on dry weekends / track outings, and i never ever jet wash, i always hand wash with a low pressue hose, the location the ESS pickup cold air is imo simply the best location, its literally forced a cold air supply all the time the vehicle is moving..... unforunatly to service the filter means Bumper off!! lol which is rather annoying butwell worth it....

meth on these cars make a HUGE difference, the intercooler ESS supply is very impressive i agree, meth/water with get you a good 40whp over your current setup.....

just keep an eye on those hose clamps..... i will also be upgrading to the okada coils, mega expensive but surely worth while, still ill burn out my stock coils first.. :-)

[ZStig]

I wonder where fr8dog is, haven't seen him here in a while

[Beedub]

Originally Posted by Roffle Waffle

I wonder where fr8dog is, haven't seen him here in a while

busy guy as hes a pilot :-)