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      07-12-2011, 01:18 AM   #37
J Tyler
My ride: bimmergirl84
 
Drives: For free.
Join Date: Jun 2008
Location: SloCal

Posts: 302
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Quote:
Originally Posted by vwong View Post
Jeff, I finally got my ass out to Buttonwillow. I kept your estimated lap times in mind all the time. Anyway, I did everything I could, but the quickest lap I did was 2:11.8xx. I think I can get to 2:10, or maybe 2:09 if the ambient temp wasn't in the mid-high 90s. I'll post up the video tonight or tomorrow.
Ambient temp has a huge affect on lap time in stock street cars, especially big heavy turbo BMWs on runflats! After watching your video I think you can do 2:08 on a cool day and a tidy lap. A hot day vs cool day can be 2-3 seconds at that track in a 335i. (More like 1-2s in an S2000/Miata as they are much lighter and non-turbo).

Quote:
Originally Posted by vwong View Post
Here's the best lap from yesterday. Jeff, feel free to critique my driving and/or racing line.

Of course over all you are really really quick! And, there are always little things to talk about, but the biggest thing that stands out to me in the video is the corner entry technique for T1, T3, and the Sweeper. I think that if you blend your steering turn-in and your trail-braking (gradually easing off the brakes) together more, you will gain quite a bit of time in those 3 corners. So - rather than the relatively fast/abrupt/late steering turn-in, try turning in slower/less-abruptly; but sooner. Once you are getting close to the apex, then you add the heavy steering input. This whole concept relates directly to the 'traction circle' representation of a tire's grip ability.

You've seen my video from Buttonwillow.... Here is my friend Billy in a Merc C63. I think he illustrates the steering/braking idea I am talking about too. See what you think -

http://www.youtube.com/watch?feature...E3dAGChE#t=31s
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