Wheel rate data

Anyone have any actual suspension wheel rate data (or geometry laid out) for any Ferraris? 308 or 348 would be especially interesting especially for a track car.

I have some for a Porsche GT3 . .. 35 N/mm front and 65 N/mm rear
"Regular 996" 29.6/41
Sport 33/50 while I'm at it.

Edit: Conversion factor multiply by 5.7 which gives front wheel rate on the GT3 about 200 in-# which felt really hard to me


The "softest" of these setups still feels harder than my 308 with 375/325 front/rear springs with qa1's dialed on 9 and 5 respectively. Trying to figure out if it's shock dampening or springs that gives this solid feel on the P cars.

Thanks,

Sean

 

Hee hee . . . giving me more reason to order double adjustable QA1's this time but then I have to buy 4 . . . don't want to do that if they're not up to the task to begin with (had failure on single adjusties). Probably will call them tomorrow and tell them what's up but I'm sure they'll need wheel rates if I talk to someone with a clue.

In one of the suspension mod threads there was problems and I thought the reccomendation was to increase spring and not run the shocks on such a high setting . .. probably only applies to single adjustment and the less expensive shocks.

Someone mentioned 750# springs to me on a 348 but I can't imagine that would be required based on the wheel rates on that GT3.

 

thanks . .. will do .. .why you ^2 the ratio . .. that would matter with velocity (2nd derivative) but not spring rate right?

edit: the ^2 must make sense I guess 'cause just did a search and cup car GT3 spring rates are 240 N/mm in front

 

that's not that obvious at first . . thanks

 

thanks for more info . .. when I installed the 375 # springs on my 308 it didn't feel as firm as my stock setup until I had turned the shocks all the way to 5 . .. my Konis had been rebuilt by Truechoice back in '97 and I think I recall them telling me they'd turn them up a few clicks for spirited drving.

Here's some thoughts on side wall deflection/tire profile . .. my P race car is way stiff like the GT3 with 275-45-16 hoosiers on the rear . .. 245-45-16 on the front . .. same size tires on the front as on the rear of my 308. I do not like the way it drives on the street . .. but the car is insane on the track . .. I'm sure the sidewalls are super stiff as tires go and are I have a set of the same Hoosiers for the 308.

Guess where I'm going with this is it seems like for the track the 308 would benefit from WAY WAY more spring . . . even more than the 450 . .. I was really surprised how "soft" the 375 springs felt with the shocks turned down . .. thought it would be at least like a stocker P car but it's obviously nowhere near that wheel rate.

 

I'm messing with my 308 again . . . I got side tracked on it after a shock failure. .. I'll be going thru all this on the 348 one of these days . .. I've started grading for the construction of my seperate "stable" in my spare time .

I wasn't ^2 the leverage ratio so that's why 750# seemed so heavy . . makes sense now.