Quote:
Originally Posted by CSG Mike
That's because if you want to be competitive, an AutoX setup and a track setup are mutually exclusive.
AutoX priorities:
- lightning fast weight shifts and small direction changes (less than 30 degrees). This is for slaloming.
-- This is achieved by REALLY high front spring rates, and a giant front sway
-- This also makes it so that under sustained cornering (sweepers), the car pushes like CRAZY, so that's why AutoX cars go deep, brake hard, and power out, rather than make a more rounded arc.
Track priorities:
- Sustained cornering speed, and being able to put power down at corner exits
-- This is achieved by getting a nice static balance.
-- Keep in mind that under power, you're unloading the front, and loading the rear.
-- Track prepped cars will sustain more raw cornering Gs, but not change direction and shift weight as quickly.
For example:
AutoX prepped FRS
- 14k/9k spring rates
- Blade type front sway, minimal rear sway
Track prepped FRS
- 10/12k spring rates
- Sways to fine tune balance.
Each car has its strengths and weaknesses. The AutoX car will likely slalom ~20% faster (raw mph), but the track prepped FRS will hold more speed on a skidpad (raw mph).
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Thank you for this post. I was thinking exactly this as I was going through the thread.
This is why highly developed, track oriented coilovers (a la Ohlins R&T) often run a rear biased spring setup. I ran that setup in my e46 M3 and the rates were 400F/630R. It was definitely a track vs autocross setup.
This also seems to be the case with the GC springs setup, and frankly to a lesser extent the FRS stock setup. My .02