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
 
Lux Angel Eyes
Post Reply
 
Thread Tools Search this Thread
      11-14-2008, 05:15 PM   #23
GregW / Oregon
Commander-In-Chief
 
Drives: 2008 M3 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

Posts: 7,263
iTrader: (1)

Garage List
Quote:
Originally Posted by jlaw View Post
Uh. No. Coasting for 6 seconds will result in a lower trap speed due to distance traveled and speed bled off while coasting.
Uhh, I think he was exaggerating to make a point.
__________________

Greg Lake Oswego, Oregon, USA
2008 M3 Coupe - Alpine/Fox Red/Carbon
2015 M4 coupe on order
GregW / Oregon is offline   United_States
0
Reply With Quote
      11-14-2008, 06:11 PM   #24
jlaw
nuh nuh nuh gone
 
jlaw's Avatar
 
Drives: E92 M3
Join Date: Aug 2007
Location: Miami, FL

Posts: 344
iTrader: (0)

Quote:
Originally Posted by GregW / Oregon View Post
Uhh, I think he was exaggerating to make a point.
If he was, that's a retarded way to do it.
jlaw is offline   United_States
0
Reply With Quote
      11-14-2008, 06:14 PM   #25
Sticky
Banned
 
Drives: E92 Jerez DCT M3
Join Date: Jan 2008
Location: Anaheim Hills / Malibu

Posts: 2,244
iTrader: (0)

Quote:
Originally Posted by BMW-M-Mexico View Post
Well, whatever the case, with race headers, deleted front cats as well as the reprogrammed software to include 8,600 rev limiter, it may be possible to get +40bhp not IMO whp. Don't honestly know what 200 more revs will get you but who knows with all that reprogramming everywhere. A word of caution, I've not seen one reputable tuner make more than 20bhp with ECU, not Dinan, nor ACS, nor RDSport, nor GPower, etc..., etc... Also, I paid for an ECU reflash that was dynoed at 44+bhp gain (dyno is on this site) and I honestly don't think I got half that. Just my opinion!! Serves my right for working with a second rate tuner I suppose, lol! In any event and for the life of me, I just can't see what those other tuners than claim big numbers know about the engines that is not known by other very, very reputable tuners.
I got 20 wheel with powerchip, just to let you know
Sticky is offline   United_States
0
Reply With Quote
      11-14-2008, 07:53 PM   #26
gthirtyfizle
Colonel
 
gthirtyfizle's Avatar
 
Drives: E92 M3 AW
Join Date: Jul 2008
Location: NYC

Posts: 2,584
iTrader: (4)

^^LMAO, i think we can come to a conclusion. Dont "F" with pg
gthirtyfizle is offline  
0
Reply With Quote
      11-14-2008, 08:28 PM   #27
jlaw
nuh nuh nuh gone
 
jlaw's Avatar
 
Drives: E92 M3
Join Date: Aug 2007
Location: Miami, FL

Posts: 344
iTrader: (0)

Quote:
Originally Posted by PencilGeek View Post
You're right...it was retarted of me to prove beyond any shadow of a doubt that trap speed is not strictly a function of horsepower. So many people here have claimed that driver ability isn't even a factor in trap speed. So the example that I gave made it so unambiguously clear that trap speed is also dependant on shift speed -- which of course is a direct function of driver ability.

Silly me for proving the point in such an obvious manner that it looked "retarded."
In the context of what we're talking about, you are told to take driver ability out of the equation... assume average driver missing no shifts. I would hope no one here is so stupid as to think that shift speed can't affect trap speed. Your example was just over the top.

The bottom line is that trap speed will be a pretty good indicator of whether your dyno numbers are in the correct ballpark, assuming no mechanical problems with the car. This was eagletango's basic point and anyone with drag racing experience can tell you that this is a common test used to verify dyno numbers.

I don't have enough data on drag racing this specific car to know what the number ranges are, but as an example... if 10 different M3's of equal weight and gearing are putting down 400rwhp on a Dynojet and trapping 119mph, and your M3 with the same weight and gearing puts down 400rwhp and traps, say, 114mph, then you know one of two things: something is wrong with your car, or you aren't really making 400rwhp.

Obviously this is not an exact science, there are too many other variables to account for... but then again, I don't think that was ever the point.

Anyway, this is not worth fighting about. I've read quite a few of your posts and agree with you 99% of the time. Just not on how you went about this one.
jlaw is offline   United_States
0
Reply With Quote
      11-14-2008, 08:46 PM   #28
swamp2
Major General
 
swamp2's Avatar
 
Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

Posts: 9,950
iTrader: (1)

Quote:
Originally Posted by PencilGeek View Post
You're right...it was retarted of me to prove beyond any shadow of a doubt that trap speed is not strictly a function of horsepower. So many people here have claimed that driver ability isn't even a factor in trap speed. So the example that I gave made it so unambiguously clear that trap speed is also dependant on shift speed -- which of course is a direct function of driver ability.

Silly me for proving the point in such an obvious manner that it looked "retarded."
I agree with the post just above (not your quote, the post). It is spot on. However, you are also correct. A 1 second vs. a 0.25 second shift time (both pretty extreme) makes about a 5 mph difference in trap speed in an E92 M3 based on simulation with CarTest.
swamp2 is offline   United_States
0
Reply With Quote
      11-14-2008, 08:50 PM   #29
Adonislike
Captain
 
Drives: Toyota Insight/Honda Prius
Join Date: Aug 2008
Location: Southern California

Posts: 842
iTrader: (1)

Quote:
Originally Posted by gthirtyfizle View Post
^^LMAO, i think we can come to a conclusion. Dont "F" with pg
Yeah. Havent posted much but Im in here everyday. And that guy (PG) should teach a class with how much knowledge he has. Would be difficult to get one over on him.

But he has always posted great info for morons like me to try and learn something. Definitely helps
Adonislike is offline   United_States
0
Reply With Quote
      11-15-2008, 12:00 AM   #30
mvagusta
Lieutenant
 
Drives: 2008 m3 coup
Join Date: Jun 2008
Location: michigan

Posts: 475
iTrader: (1)

I with pg........
mvagusta is offline  
0
Reply With Quote
      11-15-2008, 05:40 AM   #31
serven7
Second Lieutenant
 
serven7's Avatar
 
Drives: RS 46 M3
Join Date: Jan 2008
Location: Honolulu/Phoenix

Posts: 293
iTrader: (1)

Quote:
Originally Posted by Adonislike View Post
Yeah. Havent posted much but Im in here everyday. And that guy (PG) should teach a class with how much knowledge he has. Would be difficult to get one over on him.

But he has always posted great info for morons like me to try and learn something. Definitely helps
He just has too much time on his hands
serven7 is offline  
0
Reply With Quote
      11-15-2008, 09:02 AM   #32
Technic
Lieutenant General
 
Technic's Avatar
 
Drives: 2012 E92 M3, 2014 528i
Join Date: Apr 2005
Location: Ft Lauderdale, Florida

Posts: 10,794
iTrader: (16)

Garage List
2004 M3  [0.00]
Quote:
Originally Posted by jlaw View Post
If he was, that's a retarded way to do it.
Why we can't just argue at some professional level and not with some ghetto crap?

I'm really getting tired of some members in this forum that just can't help themselves in looking like morons...
Technic is offline   United_States
0
Reply With Quote
      11-15-2008, 03:48 PM   #33
jlaw
nuh nuh nuh gone
 
jlaw's Avatar
 
Drives: E92 M3
Join Date: Aug 2007
Location: Miami, FL

Posts: 344
iTrader: (0)

Fair enough. Amazing that people would argue the point, that thread must have been a trainwreck.
jlaw is offline   United_States
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 01:44 PM.




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