Quote:
Originally Posted by renfield90
Random grab bag of thoughts. Sorry it's not more organized, it's late and I'm supposed to be working.
My old T2 settings on 450lbs/in front and 550lbs/in rear:
Compression: 4 clicks from full hard (all 4)
Front rebound: 10 clicks from full hard
Rear rebound: 11 clicks from full hard
You want a stiffer rear spring on this car than on the front to make the suspension "flat." If you go too stiff in the rear, a 200tw tire (and/or your talent) will not be able to keep up. For me, too much was at 600lbs/in. Look into "motion ratio" and "natural frequency" if you want to dig into this more. A spring rate change is not the first change I'd recommend though.
If you are riding on the bump stops, your spring rate is not what you think it is. A bump stop acts as a spring in parallel which means the total spring rate is simple addition of both rates. And since a bump stop's spring rate is variable and very progressive...good luck! Get off the bump stops.
You do not have enough front camber and that is absolutely contributing to your understeer. If you can't get to -4.5 with your current plates, get new plates. This is IMO the first thing you should try, followed by getting the car off the bump stops, followed by a rear spring change.
From there I suggest finding a suspension adjustment flow chart and following it. Everyone has their own philosophy for how to tweak their car, but we're all mostly following the flow chart which provides a menu of options, and from there picking our own medicine (or in some cases, poison). Get your mid corner straightened out first because sometimes that will fix entry/exit as well.
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Interesting. I’m on 7/9k so close to yours, mine is 400/500.
I did end up also increasing my ride height as I definitely was bottoming out the front on bumps. First thing I noticed on the street was much less rear weight shifting upon acceleration, that the rear seems to follow the front a lot closer, I actually get feeling from what’s happening in the rear, and the ride isn’t “crashing” anymore. Instead it’s stiff, but doesn’t crash. Will have to see how the 7/9k holds up in autocross.
For compression, from my own street test and tune and capabilities I ended up about the same, 4 clicks from full stiff for compression on all four corners.
I’ll be playing with rebound next using my steps (one of the posts on this thread).
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