8/10 is pretty good for street tires, will need more for r-comps

 

Do some research on the Gerard-spec stuff, IIRC he used fairly low spring rates....maybe even lower than what is currently shipping on stock off the shelf DFV's.

I could be wrong....had a set for a month or so that were in need of a rebuild and opted to sell and get brand new DFV's with HyperCo 600/700lb springs

 

gerrard spec's run 475lb/575lb hypercos with custom valving which is approximately 8.5k/10.5k , i have a set on my car right now. he recently told me can handle up to about 14k issue (i think...i have it in my notes somewhere). he ran those specs with stock bars, bumpsteer bushing, poly lower shock bushing in the rear and hoosiers.

as was discussed in the spring thread i started, i really think that tires have changed so much that the "go to" spring rates need to be rethought, street tires were nowhere near what they are now when he came up with that setup.

 

There is no set answer for spring rates. In the end, you are trying to control body motion and suspension travel to keep the tires and suspension operating in a favorable range (better part of the camber curve and best possible contact patch). The 'more spring less bar' vs the 'less spring more bar' argument rages on.

I will say if you are on 10k/8k you are probably much to low for 275 R comps. If the fronts are 10k and you are driving hard on a road course, you are most likely riding the bump stops on occasion. If they are 8k you are probably on them a lot. If you are loaded up in a corner and any small bump or such in the track makes the car get all skittish and nervous, probably on the bumpstops.

 

Hoosiers A6's have been around for a long time now. You guys just need to do some research. I will tell you that i run anywhere from 10k=12k to 14k-16k. What track you are on also dictates spring rates.

 

Front spring is this, which if I read it right is approximately a 10.5k spring??? Am I doing the numbers correct?

 

googling that part number turns up 10k. so it would appear your setup in quite a sub optimal configuration.

 

Yup, heh, that's why I'm venturing into new springrates. Here's where I'm stumped now. The rears are unmarked, unbranded. They're yellow as well as the fronts, but there's no Eibach, Ohlins, or part numbers on them anymore. From what I've read the Gerrard spec Ohlins came with 10.5k/8.5k rear, which would put the 8.5k's on my rear end. Everyone here says the stiffer springs should be in the rear. My car has oversteer on corner exit, I really hope I don't mess up my entire balance getting into this...

 

At the same time oversteer on corner exit has a lot to do with you being WOT... my car has oversteer with left foot brake. Depends how aggressively you drive the car. Mine's as neutral as can be up until I transfer weight or go WOT, then the rear end comes out to play slightly.

 

Honestly, the only way you are going to make the car better is to try some different things and see what happens. And you may try some combinations that suck. That is part of the whole process. You will not know how much better or worse that car will get on any given setup without trying it.

And do you have Traqmate or a Solo or similar for logging? Make a change, log it and see how it feels. A combination of how comfortable the car feels to you and data showing better corner entry/apex/exit speeds will point you to where you want to be.

 

One thing I constantly preach.

Data makes you faster.

 

Are you talking about this Data?

 

having a spring imbalance like that can make for a VERY sketchy handling car going strictly by the "book"...a pushy front end with an undersprung rear that i would think could start to get loose when overloaded mid corner.

 

Are your coilovers R&T's or DFV's. I don't ever recall Gerrard selling DFV's just the old R&T's with Vishnu? (could be wrong). Either way i highly doubt that 8.5's were on the rear of his coilovers if they are truly Garrard spec.

FWIW, these are what the R&Ts looked like. They do call them the same thing now i believe but, they were not the same back when they came out. https://www.evolutionm.net/forums/sa...s-springs.html

 

I believe you have it backward. The originals were called DFV's, where they went to the R&T version just a few years ago. Mine are, definitely DFV's in Gerrard spec. I Purchased them from Robispec, who at the time was doing his suspension. My top hats and camber plates are (were) gold in color. Performance shock verified last year during the rebuild that they have been revalved, so everything checked out as far as I can tell.