Damper/shock absorber forces

[NoHachi]

Quote:With 8kg/mm/6kg/mm springs I've calculated bounce frequency of 2.49hz front and 2.56hz rear.

Hmz, that weird, I get 2.67Hz/2.42Hz in two wheel bump, or 2.75Hz/2.62Hz in roll. And those numbers are already compensated for the added weight of the CA18DET and turbo stuff added to the front of mine..so for a stock AE86 the rates would be even higher? I also didn't detract the sprung weight from the cornerweights, so that would make the freqs even higher.

What front lever ratio are you using? I did some measurements (also not very accurate) and ended up at 0.99 when I included the influence of KPI (measured at~8degrees). Also what are you using as cornerweights? That might explain some of the differences.

Quote:I'm not into mega stiff suspension so I'm sure some people would disagree with the above but I think comfort and grip are as important as handling.

Amen. Comfort is completely secondary to me. But optimise for grip and suddenly you get some comfort back too. How about that

Quote:I'm using a guestimate of 500mm for CoG but haven't done any research as to how accurate it is. As I'm only using for making comparisons, not outright results so it doesn't make a big difference.

Shame, I would like to do some roll rate calcs..guess I'll have to hoist the whole thing on its side one day and measure CoG location. Hope that works on 86's only ever tried it once with a tiny formula car.

Quote:Anyway I think less than 2Hz would be a good start

I'm at 2.2/2.1 Hz and its a world of difference (used to be a 2.8/2.7). The car now actually grips the road instead of skipping over it. However, I think I'm at the outer limit of what is possible on a 86 without massive wheelgaps. And I already run the car quite high compared to the popular JDM tight yo stance.
As I have the car now (5.8kg/mm-4.46kg/mm, shortstroked), the total stroke at the front is 90mm (@1G acceration max) while I measured the AE86 to have about 98mm available between full droop and tire/fender contact.