ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Engine, Exhaust, Drivetrain Modifications
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      07-14-2012, 10:08 AM   #683
Westersund
Captain
Westersund's Avatar
Sweden
478
Rep
859
Posts

Drives: BMW
Join Date: Nov 2011
Location: Hallstahammar

iTrader: (1)

Quote:
Originally Posted by Z4-VILLA View Post
wonder just how smooth this would be
Heavy fly wheel = Slightly slower reving but smoother ride.

Light fly wheel = Faster reving but jerkier ride.
Appreciate 0
      07-14-2012, 05:13 PM   #684
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
awesome thanks for this so.....

on the rear be careful with washer layout.. bear in mind im using Re mounts...

Only need to remove the tray, is this difficult or piece of piss??

the fronts im always very careful with the nuts, Tq figure is 35nm.... will grab the tis to get Tq figures for all parts.... all in all, is this something you felt comfortable doing??

ill then drive to a shop to get alignment.... i will be trying to lower the car the minimum amount possble....
no its fairly easy and straightforward, just take your time, and have a good torch (flashlight) by your side
__________________
Appreciate 0
      07-14-2012, 05:14 PM   #685
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Westersund View Post
Heavy fly wheel = Slightly slower reving but smoother ride.

Light fly wheel = Faster reving but jerkier ride.
yup. I've had the 8.5lbs UUC flywheel on my first bmw, it was tricky
__________________
Appreciate 0
      07-15-2012, 08:07 AM   #686
Westersund
Captain
Westersund's Avatar
Sweden
478
Rep
859
Posts

Drives: BMW
Join Date: Nov 2011
Location: Hallstahammar

iTrader: (1)

Quote:
Originally Posted by Roffle Waffle View Post
yup. I've had the 8.5lbs UUC flywheel on my first bmw, it was tricky
The only good reason to get a light fly wheel is if you're building a proper race car imo.
Appreciate 0
      08-11-2012, 12:42 PM   #687
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Ran the quarter mile for the first time yesterday. Ran 13.0@111 to 12.95@122.8 all night. 60 foot times consistently 2.2s. Consistent enough to get to the semifinals in the bracket racing competitions. Then in the semifinals i ran a much improved 12.6@113.6mph with a 2.0s 60 foot. Lots of videos and pics to follow. Dissapointed that i didnt get close to low 12s and 120 speeds but i think the launch pluz the florida heat was the biggest reason.
__________________
Appreciate 0
      08-11-2012, 03:36 PM   #688
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

Quote:
Originally Posted by Roffle Waffle View Post
Ran the quarter mile for the first time yesterday. Ran 13.0@111 to 12.95@122.8 all night. 60 foot times consistently 2.2s. Consistent enough to get to the semifinals in the bracket racing competitions. Then in the semifinals i ran a much improved 12.6@113.6mph with a 2.0s 60 foot. Lots of videos and pics to follow. Dissapointed that i didnt get close to low 12s and 120 speeds but i think the launch pluz the florida heat was the biggest reason.

wow im dissapointed :-( that dude with the vt1 did a 12 and fr8tdog (i miss that dude) did a high 11......

i was hoping with a proper warmup, drag radials, this car would stretch a low 11......

pics and videos NOW please!!!

did you get wheel hop?
did you baby the launch?
how warm was it out>???
good track prep??

i need the details tom!!!!
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-11-2012, 04:47 PM   #689
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
wow im dissapointed :-( that dude with the vt1 did a 12 and fr8tdog (i miss that dude) did a high 11......

i was hoping with a proper warmup, drag radials, this car would stretch a low 11......

pics and videos NOW please!!!

did you get wheel hop?
did you baby the launch?
how warm was it out>???
good track prep??

i need the details tom!!!!
temp and humidity was very high, about 80*F
this car will NOT do low 11s, trust me. I'm pretty sure I'm hitting 8psi of boost too..

If launching over 1500rpm I got wheel hop, the higher RPM the worse. Blame my stiff suspension and BMW's design for that. Good cars usually run the first 60 feet in 1.6 to 1.8 seconds. I was consistently around 2.2 and 2.1 seconds, the best was 2.0 seconds. The 2.0 second launch landed a .3 second faster run, so do the math. Based on 0-60 runs I've done in cold weather with a timer, my best launches are from low RPM and rolling off the clutch with minimal wheelspin. I noticed in my videos I'm laying down the power in all the gears, but chirping the tires on shifts (.1 seconds worth each). The race finishes in 4th gear.

I'm gonna start with posting my favorite runs, Vette, Viper and turbo civic. For comparison, the Viper GTS' best run was a 12.86@~116mph, so I would have beat him on my best run, but his trap speed is a bit higher. That car is a benchmark for me, as they typically run 12.0@122.

Many ppl said they usually run .5 seconds faster on colder nights. Time to fix my broken Meth injection kit....
__________________
Appreciate 0
      08-12-2012, 03:35 PM   #690
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

clips



stats:
Attached Images
    
__________________

Last edited by ZStig; 08-12-2012 at 07:01 PM..
Appreciate 0
      08-13-2012, 07:59 AM   #691
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

lol love how you went past that viper like it wasnt trying!!! car sounds good,

just wondering why no tyre warming?? i still think a low 11 is possible with drag radials, warm tyres, cool air and the right launch....

that wheel hop made me wince in pain!!! our axles wont take too much of that so be careful!!
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-13-2012, 08:02 AM   #692
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

the civic race was awesome, in that clip at 3 mins you can ealy hear the BPV blowing off pressure, a proper whooooshhh...... never heard that before but it sounded cool....
considering we have another stage to run to, im very impressed.... well done....

im on track 6th september and looking forward to showing some footage!!
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-13-2012, 12:18 PM   #693
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
the civic race was awesome, in that clip at 3 mins you can ealy hear the BPV blowing off pressure, a proper whooooshhh...... never heard that before but it sounded cool....
considering we have another stage to run to, im very impressed.... well done....

im on track 6th september and looking forward to showing some footage!!
the civic race was very close, I'm surprised I launched as hard as this guy, who's been drag racing for years, and won several events. The vette race was the closest, although it doesn't look like it in the video, the timesheet shows a win by just a hair.

Maybe YOU have another stage to run to, but I don't. I'm 90% sure my trap speeds sucked because of major heat soak. I've sent a request for a replacement controller box for my AEM meth kit. That shit needs to be WORKING.

If it still doesn't help, I'll install something to spray on the intercooler's outside. jethotjethot!
__________________
Appreciate 0
      08-13-2012, 12:20 PM   #694
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
lol love how you went past that viper like it wasnt trying!!! car sounds good,

just wondering why no tyre warming?? i still think a low 11 is possible with drag radials, warm tyres, cool air and the right launch....

that wheel hop made me wince in pain!!! our axles wont take too much of that so be careful!!
Car sounds pretty quiet, its fun to watch it go. I'm gonna get my exhaust cutouts installed this week!

I didn't do any big burnouts because I'm a noob at them and didn't want to stall the car by braking too hard, and I didn't want to destroy my daily driven $$$ tires. I'll definitely run lower tyre pressures next time

Low 11s are impossible unless you have closer to 480rwhp. I'd estimate that with this heat, I'm closer to 380rwhp
__________________
Appreciate 0
      08-14-2012, 06:27 AM   #695
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

Quote:
Originally Posted by Roffle Waffle View Post
Car sounds pretty quiet, its fun to watch it go. I'm gonna get my exhaust cutouts installed this week!

I didn't do any big burnouts because I'm a noob at them and didn't want to stall the car by braking too hard, and I didn't want to destroy my daily driven $$$ tires. I'll definitely run lower tyre pressures next time

Low 11s are impossible unless you have closer to 480rwhp. I'd estimate that with this heat, I'm closer to 380rwhp
no way in that heat are you running 380rwhp.... not to walk a viper like that...... , you down on power but not as much as you think.

BUT... considering you NOT warming the tyres, baby-ing the launch, on road tyres...... im impressed.... id love to see someone do an all out, warm tyres, drag radials, vt2 on a cool evening with good track prep, im pretty certain we'd all be alittle suprised!!
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-14-2012, 09:27 PM   #696
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
no way in that heat are you running 380rwhp.... not to walk a viper like that...... , you down on power but not as much as you think.

BUT... considering you NOT warming the tyres, baby-ing the launch, on road tyres...... im impressed.... id love to see someone do an all out, warm tyres, drag radials, vt2 on a cool evening with good track prep, im pretty certain we'd all be alittle suprised!!
trap speeds tell the power, I beat the viper on his shitty run, but I'd still edge him out because I shift faster. Anyway, compare my 13 second run to his

viper 13.466 114.63
me 13.581 109.92

as you can see, his ~450hp car is 5mph faster. thats huge
__________________
Appreciate 0
      08-14-2012, 09:32 PM   #697
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Anyway, the BIG NEWS:

The exhaust cutouts are in, and I'm sooooo glad you can adjust the size of the opening with the toggle switch. You hold it down for 3 seconds for a full open, but you can tap it to tweak it.

On full open, or even 75% open, it is BONKERS loud. Plus, it opens under my seat, so I feel the pulsation of the exhaust. By lightly tapping the throttle, I can pop it as many times as I want when getting off the gas. In fact, I can make it sound like a gattling gun with 10 pops. hahahha

It does NOT sound refined, it sounds like a car with no mufflers. I'm probably gonna run it on about 25% open or so, because I attracted a lot of cops within 5 miles of road. Its REALLY fun to see a cop ahead thats waiting at an intersection that knows you're loud, but you close the valve, and you're dead silent. Then half a mile later all hell breaks loose again. Its hillarious

A lot more bass, and a lot more volume. crazy loud. let me repeat myself again. its loud!

Will take clips soon.
__________________
Appreciate 0
      08-14-2012, 09:37 PM   #698
Twisted Six
CarbonFiber Engineer @ ZeroMassMotorsports
Twisted Six's Avatar
United_States
40
Rep
1,481
Posts

Drives: Z4si-coupe
Join Date: Mar 2009
Location: -Laguna Beach Ca.

iTrader: (6)

Quote:
Originally Posted by Roffle Waffle View Post
Anyway, the BIG NEWS:

The exhaust cutouts are in, and I'm sooooo glad you can adjust the size of the opening with the toggle switch. You hold it down for 3 seconds for a full open, but you can tap it to tweak it.

On full open, or even 75% open, it is BONKERS loud. Plus, it opens under my seat, so I feel the pulsation of the exhaust. By lightly tapping the throttle, I can pop it as many times as I want when getting off the gas. In fact, I can make it sound like a gattling gun with 10 pops. hahahha

It does NOT sound refined, it sounds like a car with no mufflers. I'm probably gonna run it on about 25% open or so, because I attracted a lot of cops within 5 miles of road. Its REALLY fun to see a cop ahead thats waiting at an intersection that knows you're loud, but you close the valve, and you're dead silent. Then half a mile later all hell breaks loose again. Its hillarious

A lot more bass, and a lot more volume. crazy loud. let me repeat myself again. its loud!

Will take clips soon.
Good times for sure. I had cut-out/bypass valves on my turbo 240-Z and it was fun to partially close-it to feel the torque differences from full open. It was a single pipe 3" with zero 90's, only 45*.Boosted cars don't like much back pressure but NO BP seemed to weaken things in different rpms.
Appreciate 0
      08-14-2012, 09:41 PM   #699
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

probably doesn't add more than 10hp on a supercharged car, but its gonna scare some people thats for sure
Attached Images
 
__________________
Appreciate 0
      08-15-2012, 09:34 PM   #700
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

__________________
Appreciate 0
      08-16-2012, 08:50 AM   #701
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

sounds like RPI cans!!!!!!

not to sure on this mod tom??? seems like alot of expense for nothing other than noise??
at least the rpis drop a shed load of weight.......

sounds good tho!!!
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-16-2012, 11:45 AM   #702
ZStig
instagram 997turbotom
279
Rep
7,376
Posts

Drives: Interlagos Z4MR
Join Date: Jun 2008
Location: Delray Beach, FL

iTrader: (4)

Quote:
Originally Posted by Beedub View Post
sounds like RPI cans!!!!!!

not to sure on this mod tom??? seems like alot of expense for nothing other than noise??
at least the rpis drop a shed load of weight.......

sounds good tho!!!
This mod continues the theme/ideology of my build, which is to create a easily tolerable daily driver that turns into a polar opposite on the track or any kind of competition.

Yeah, I gained 6lbs or so. I wanted something noisy for when I'm feeling like the stock is too quiet. The sound isn't as "good" as I wanted, and like all cutouts, this one has a very small leak that you can hear when its closed. In fact, I don't really like the sound at full throttle either. It sounds its best driving at partial throttle downtown, where the sound reverberates and bounces off building walls, it sounds like a full exotic cruizing by.

I wanted to do this mod so I can have a loud exhaust AND a very quiet exhaust at the same time. I did not want an aftermarket muffler that can become annoying, and then I'd be stuck with it. Its such a pleasure to press that button and go back to the stock sound. Plus, I'm sure it picked up a couple of horses, probably between 5 and 10. I'll dyno after my meth kit is fixed
__________________
Appreciate 0
      08-16-2012, 03:29 PM   #703
Beedub
Major General
United Kingdom
423
Rep
5,327
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

Quote:
Originally Posted by Roffle Waffle View Post
This mod continues the theme/ideology of my build, which is to create a easily tolerable daily driver that turns into a polar opposite on the track or any kind of competition.

Yeah, I gained 6lbs or so. I wanted something noisy for when I'm feeling like the stock is too quiet. The sound isn't as "good" as I wanted, and like all cutouts, this one has a very small leak that you can hear when its closed. In fact, I don't really like the sound at full throttle either. It sounds its best driving at partial throttle downtown, where the sound reverberates and bounces off building walls, it sounds like a full exotic cruizing by.

I wanted to do this mod so I can have a loud exhaust AND a very quiet exhaust at the same time. I did not want an aftermarket muffler that can become annoying, and then I'd be stuck with it. Its such a pleasure to press that button and go back to the stock sound. Plus, I'm sure it picked up a couple of horses, probably between 5 and 10. I'll dyno after my meth kit is fixed
fair enough.....

as an apology for questioning your actions, i bring woman, car and smoke.



from 3 mins on will make you smile.


random... but awesome.
__________________
Z4MR VT2 - Clubsport build.
Multi award winning Detailing | Wrap | PPF specialists UK based - www.topwrapz.com
Appreciate 0
      08-16-2012, 05:09 PM   #704
Z4-VILLA
Banned
Afghanistan
110
Rep
2,460
Posts

Drives: Z4M Hardtop Roadster
Join Date: Feb 2009
Location: Classified

iTrader: (0)

fucking hot
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 08:21 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST