Quote:
Originally Posted by Shankenstein
I remember hearing Shaikh from Fat Cat Motorsports talking about his standard "aggressive street + light track" setup is 1.8-1.9 Hz in front and 1.9-2.0 Hz in rear.
As the CSG guys can attest, a good damper can be tuned for much higher rates (3.0-3.5 Hz)... but the only reason you'd want to go that far is when you've dropped the car low or there is a super-low splitter on the front.
The theory of flat ride is that your front tires will hit the bump first, and depending on the speed, the rear tires will hit it shortly after. The front and rear need to settle simultaneously (per the theory). At autocross speeds (50-70 mph), I've calculated a 10-15% bias to the rear is best. For track only situations, you'll be driving faster, so a bias of 10% is probably better.
BTW, you're welcome to use my suspension calculator spreadsheet. One of our forum members got it from the Miata guys, and I've done some fiddling with it.
LINK to Google Drive |
Awesome! Thanks for sharing that calculator.
While I've noticed that while the rear motion ratios of 0.77 is agreed upon by a lot of people who have done their own calculations, I have noticed that the front seems to vary between 0.95 and 1. Why is this?
I also see there are a lot of variables that seem to play into all this. How do you (or rate calculators) factor such things such as aero (or lack of it), tire width and compound, etc.?
It's a little difficult for me to understand the math here (let alone check it), but I found this:
Quote:
|
Another setup – the RCE T2s that come in 400/400 result in NFs of 2.27 Hz Front and 2.16 Hz rear.
|
Isn't that opposite of the theory above? How does RCE do it (and get away with it too?). I understand RCE favors a square setup, which not everyone prefers, but it seems like they make it work and people are generally happy with their way of doing things.
Quote:
Originally Posted by strat61caster
imo anything over 300# is going to want a helper spring on this car.
|
Yeah, I had no intention of running without helpers. I'm just unsure of spring length and not being able to get the car at the desired height.