BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      02-24-2009, 01:33 PM   #1
gnpower
Lieutenant
United_States
17
Rep
475
Posts

Drives: BMW ///M Sport 135i
Join Date: May 2008
Location: Red Sox Nation

iTrader: (0)

Rollout

Is it exactly what is sounds like? They say you can get faster drag times with just a foot of rollout.
__________________
///M 135i
Appreciate 0
      02-24-2009, 07:56 PM   #2
SpeedballTrix
Second Lieutenant
SpeedballTrix's Avatar
No_Country
3
Rep
242
Posts

Drives: 2009 135i 6MT SBM/CBL; 2022 X5
Join Date: Nov 2008
Location: Long Island, NY

iTrader: (0)

Quoted from http://www.1addicts.com/forums/showthread.php?t=226345:

Quote:
Originally Posted by SpeedballTrix View Post
Rollout is the measure of how far back from the start beam you stage your car before launching. What this does is allow your vehicle to get a running start before starting the ET timer. Using a lot of rollout is referred to as shallow staging. Using very little is reffered to as deep staging (because you are deep into the box formed between the staging beam and the start beam). The adverse affect of rollout is that the reaction timer starts the instant the light goes green, not the instant you cross the start beam. Therefore your reaction time becomes "worse", even though it didn't actually change.
The way you compensate for this is actually by sorta cheating.
It's hard to do, but what you do is stage shallow to get the ET advantage by giving your car that running start but you have to jump the light a tiny bit. This means that your RT will also decrease. The problem is if you jump too much you will redlight. The amount you can jump over your rollout is determined by the contact patch of your tire (that's the total amount of tire that contacts the road when your car is standing, which is affected by rolling diameter and tire pressure).

For street racing where there are no staging beams, you are essentially always starting with zero rollout, this is why alot of people dont bother talking about rollout. This is also why some people refuse to accept 0-60 times with rollout taken into account: because it's almost like cheating. But if it can be (and always is) done on a race track then you have to be aware of it and be prepared to use it.

This is why some magazines report 4.8s 0-60 and some report 5.2s 0-60.
The affect is equal on quarter mile ET. Dropping .4 seconds on your 0-60 by using rollout will drop about .4 second on your quartermile time. If you know drag racing you know .4 seconds is HUGE.

To get a 135 to drop half a second by power alone would take probably another 80 or 100 hp. Rollout is basically a free 100hp worth of dragtime IF you can do it right, which is not easy. I, for example, would fail miserably because Im simply not good at all at drag racing =P
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 06:37 AM.




1addicts
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