BMW M3 Forum (E90 E92)

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


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications
 
GetBMWParts
Post Reply
 
Thread Tools Search this Thread
      02-15-2013, 12:00 AM   #23
thorny
Captain
 
thorny's Avatar
 
Drives: 2007 X5 E70, 2011 M3 E92
Join Date: Apr 2011
Location: Houston, TX

Posts: 935
iTrader: (9)

Quote:
Originally Posted by GIdriver View Post
Nice runs!! I have two questions:
1. The 4.5sec to 60 was using the "one foot rollout" feature?
2. (This one's open to the community) Do 1/4mile drag strips use/don't use the "one foot rollout" while measuring 60', ET, etc?

This is SOlO data logger I use on track to measure my lap time. It has "Performance" mode when you can set it up to measure 0-60, 1/4 mile. etc etc.
I believe it starts recording as soon as it detects motion.
thorny is offline   United_States
0
Reply With Quote
      02-15-2013, 12:15 AM   #24
thorny
Captain
 
thorny's Avatar
 
Drives: 2007 X5 E70, 2011 M3 E92
Join Date: Apr 2011
Location: Houston, TX

Posts: 935
iTrader: (9)

Quote:
Originally Posted by 1SICKM View Post
Nice runs! 60 ft timing is off and your 1/4 time might be off to. If you want to be competitive you need 3 things...drag radials, linelock and launch control. Stay focused, work on your 60ft, race the clock not the other car and most importantly show up with a properly setup car and tire psi! Go for it !!!
Thanks for the advice. I did a lot of research prior to going and read a lot of your posts. I know you speak with authority on the subject.

The deal is I largely prefer track, I even have track spec alignment with large negative camber. Having two setups (track and strip) are not my goal.

At the same time I find it fun and think about going back, but I am aware I will never be in a 10 second realm.

I agree with staying focused, and I can't care less about the guy next to me. I hope their timing system will work better next time.

What tire pressure do you recommend with street tires like I have, I run 36 street, 36-38 track (hot)? I know they are not ideal for the strip.

Do you offer any advice about LC. I know how to activate it. I drop shifter and my tires spin like crazy, I have no traction whatsoever, then the car upshifts into second gear and redlines without shifting into 3rd. I don;t know maybe I let the gas off a little because of all the drama, but man, unless I get drag radials and get immensly more grip - I will dig a hole at the start line faster than I get to the 60' mark..
thorny is offline   United_States
0
Reply With Quote
      02-15-2013, 12:22 AM   #25
thorny
Captain
 
thorny's Avatar
 
Drives: 2007 X5 E70, 2011 M3 E92
Join Date: Apr 2011
Location: Houston, TX

Posts: 935
iTrader: (9)

Quote:
Originally Posted by mdoughty View Post
I hate to say it and I'd love to be a believer but.... Those slips don't correlate.
The thing is my car is so fast, that only Einstein Special Relativity theory can explain my slips
thorny is offline   United_States
0
Reply With Quote
      02-15-2013, 07:24 AM   #26
1SICKM
Captain
 
1SICKM's Avatar
 
Drives: 2009 M3 E92
Join Date: Oct 2010
Location: Mansfield, NJ

Posts: 946
iTrader: (5)

Tire psi needs to be between 25-30psi for streets. Just buy a set of DR's (mine are for sale). PSI for drags start around 25 but i usually run high teens. Your not supercharged so your psi wont be as low as mine. You really can't use launch control unless your on drags and the difference is huge ! Track prep and DA has a lot to do with it.
__________________
E92 M3 DCT...Powered by ESS VT2 650/DCT GTS Software/Aquamist HFS-3 50/50/Morr /Toyo R888's

CURRENT WORLD RECORD HOLDER 1/4 MILE - 12/7/12 (ESS VT2 625, Meth Off)
ATCO RACEWAY: 10.65 @ 131.79MPH 1.725 60FT
1SICKM is offline  
0
Reply With Quote
      02-15-2013, 07:49 AM   #27
CanAutM3
Brigadier General
 
CanAutM3's Avatar
 
Drives: 2008 E92 M3 (2015 M4 on order)
Join Date: Jan 2012
Location: Montreal

Posts: 3,415
iTrader: (0)

Garage List
2008 BMW M3  [0.00]
2006 Audi S4  [0.00]
Quote:
Originally Posted by thorny View Post
I agree, the breakdown seems to be off on the last run. I do believe in my 11.90 time nonetheless. I knew right away it was my best run long before receiving my slip, I had no tire spin and it felt awesome. I didn't have my left foot on the brake, so who knows maybe I rolled a few inches. My best run is at the very end of the video, filmed from the grand stand.

I think there could be discrepancy between the way track measures things and my own GPS logger. Here are logger shots (in order) from run 1 (4.74) and run 2 (5.52) for comparison. And my best 4 second 0-60 from "the street"

My plan is to go again in the near future and get more than 3 runs in a day and see what I can do trying different things. One thing I promise - my slips or data loggers are not photoshoped Just shearing with the community.
What I mean by a roll is starting behind the starting line. When the christmas tree turns green, you have already travelled some distance and gained some speed before tripping the start timing lights. So you enter the 1/4 mile with x mph instead of zero mph. You then carry some of that extra speed across the 1/4 mile. It does not take much roll to make a significant difference.

Further, even your best 0-60 on the street does correlate to you 11.9 run. 0.8 seconds to travel 142 feet is 120mph (should be in the 60-70mph range).

Last edited by CanAutM3; 02-15-2013 at 09:53 AM.
CanAutM3 is offline   Canada
0
Reply With Quote
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
Forum Jump


All times are GMT -5. The time now is 05:06 AM.




m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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