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      12-05-2018, 11:48 AM   #28
redpriest
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Drives: 2011 M3/Porsche 992 GT3RS
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Quote:
Originally Posted by italyix View Post
Just got back from running Streets of Willows with OnGrid this past Sunday and was experiencing bad under steer, and am trying to understand why.

My set up is:
Falken Azenis
Front 285
Rears 315

Brembo 380mm bbk front and rear
Endless pads

US MDM

Camber is 3.8 front and 3.2 rear

Running a front GTS style splitter also

Best time was 1:30, my friend ran a 1:28 with my car as well

Any thoughts as to what is causing the under steer? I was also over heating the front brakes, I think the mdm was kicking in waaaay too early and causing issues

I should also add that while the rear tires were being used to the fullest, as the wear marks were spot on, the fronts were scrubbing and not hitting their wear marks. Too much camber?
You'll find I think, that's just the nature of Streets. Having just come back from there for the second time ever, was experiencing understeer in quite a few corners, especially turn 8.

It doesn't seem to be a very good grip surface and it's very bumpy making it a challenge for your suspension.

I did 1:28 once in my e92 when I was relatively new to driving it - maybe 6 or so track days of experience. That lap with MDM is here:

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'06 BMW M3 ZCP 6MT | JRZ RS Pro + Hyperco 650/750 | Epic Tune | Brembo 355mm BBK | too many to list
'11 BMW M3 ZCP DCT | Akra Evolution | Eventuri intake | MCS 3-way | 4.6L Carbahn S65 | Zebulon Aero | AP Racing Radi-CAL BBK by Essex | 305/645-18 Pirelli DHB
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