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      01-02-2020, 05:03 PM   #28
CarJunkie
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Drives: e82 1M, f87 M2cs
Join Date: Nov 2011
Location: Tri-Cities, Washington

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2011 BMW 1M  [0.00]
Quote:
Originally Posted by rapter View Post
Quote:
Originally Posted by CarJunkie View Post
I have been very happy wit PS4S (255f/275r) on stock wheels for daily use. I haven't run autocross or track on them. They do not tramline on uneven roads nearly as badly as RE11, RE71R or Rival S.
Are you running stock suspension springs and dampers?

How are the handling characteristics, specifically any understeer?

The oem tire and suspension is set up neutral and set to oversteer at the limit (as everyone knows).
I am using Ohlins with camber plates, so not stock suspension. If you are on a stock suspension, the understeer will persist if you stay with a staggered set up. This was true for me with RE11s on stock wheels (255 in the front and 275 in the rear). While on those tires, I installed camber plates which made a world of difference and completely eliminated the understeer.

I'm currently using a square wheel and tire set for the track which is very neutral at the limit. To achieve this, I have -2.5° of camber in the front and-1.8° of camber in the rear. With my stock wheels on the car, which currently have the PS4S on them, there is still a tendency to understeer very slightly at the limit, which is much safer for every day use.
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1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
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