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





 

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      08-20-2014, 02:06 PM   #23
chris82
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2008 BMW 128i  [5.00]
What series do you race in? Were you allowed to upgrade your brakes?
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      08-20-2014, 02:33 PM   #24
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Yes, fully floating 6 pot AP's have been fitted
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      08-20-2014, 11:13 PM   #25
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Are you running the 235 tire on a 9" due to classing specifications, or by choice? I want to get a 17x9 w/ 255 on the front of my 135i. My current 17x8.5 just isn't enough.
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      08-21-2014, 01:59 AM   #26
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I'm now running 225/40x18 front on 8J and 265/35x18 rear on 9J
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      08-21-2014, 06:24 AM   #27
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IMO you should ditch the AD08s, IMO they aren't that great of a street tire.

I'd look into a RS3 or similar tire, they have seemed to offer much more grip from my findings.

I'd agree on decreasing compression in the rear and/or increasing front rebound. However you shouldn't increase rear pressures. All this does is will make the tire break loose sooner, and this doesn't really solve the problem at hand.

Do you have a front or rear bar?

If you have a rear bar, disconnect it and try running without a rear bar. If you have a front bar, make it stiffer.

Finally, I don't understand the E87 body, but the same spring rate front/rear seems odd.
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      08-21-2014, 06:47 AM   #28
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I'm now running 450 front springs and 275 rear which is a great improvement
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      08-21-2014, 08:43 AM   #29
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Quote:
Originally Posted by kbird View Post
I'm now running 450 front springs and 275 rear which is a great improvement
Wow...that is REALLY soft in the rear.

I know different chassis, but I'm at #400 fronts and #700 rears.
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      08-21-2014, 08:47 AM   #30
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Mine are true coil overs on the rear, are yours?
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      08-21-2014, 09:18 AM   #31
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Quote:
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Mine are true coil overs on the rear, are yours?
Multi-link.

Makes sense, have you calculated your motion ratios to see if you're wheel rates are the same front/rear?
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      08-21-2014, 09:40 AM   #32
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No, do you have a formula for that?
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      08-21-2014, 09:59 AM   #33
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Quote:
Originally Posted by kbird View Post
No, do you have a formula for that?
I only have it for multi-link rear and macpherson strut front.

Do you have a rear bar? I'd remove that if you still can't calm down the rear. I think you're compromising ultimate rear grip with a soft setup.
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      04-02-2015, 01:49 PM   #34
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Quote:
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E36 M3 throttle bodies, race exhaust manifold, Motec ECU. Standard head and cams but the Valvetronic is locked at full lift

Wow wish I seen this 10 years ago...
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