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      01-17-2015, 01:00 PM   #147
bigjae1976
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Drives: 11 E90 M3 Individual
Join Date: Mar 2006
Location: Houston, TX

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2004 BMW M3  [6.33]
2011 BMW E90 M3  [6.83]
2013 BMW 328i  [6.67]
Quote:
Originally Posted by driftflo
Quote:
Originally Posted by bigjae1976 View Post
So I guessed that lockup on decel is bad...but I guess its good? When I think decel, I think corner entry to the apex. Locking the axles to xx%...doesn't that cause the rear end to not want to rotate?
yes, this is true. too much lockup on decel means it has some turn-in understeer. but bevor turning in there normally is a certain need to brake hard. and if you do that (especially in a quick corner, where you cannot brake on a straight line) the rear end gets nervous and wants to spin the car. therefore you have the decel lockup that helps keep the car straight and stable under hard braking. if you have dsc switched on or dont brake hard anyway you don't need decel lockup. if you drive and brake hard on quick racetracks, you definitely do need it to be quick!

turn in understeer then has to be reduced via other setup parameters (coilovers, swaybars, camber, square tire setup, ...).

Quote:
Originally Posted by bigjae1976 View Post
This diff stuff hurt my brain but I like it!
yes, it is really difficult to really understand that stuff. there are very few out there who really have understood it ;-)
Awesome info! I do appreciate your expertise!
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