vr4henry

Hi guys,

Tons of info on doing the GT3 revalve and re-spring -- but looking for some info on GT2 specific spring rates w/ OEM coilovers (re-valved or not).

Proper spring rates? (swifts?)
Re-valving necessary at what level of spring rate increase?

Best,
Henry

993GT

I plan on doing the same on my GT2 over this winter storage period. Not sure exactly what rates I will be running be think around 500/700 or 600/800 ft/rr. IE. identical to GT3 rates, help keep a little squat in the rear to help put the power down. Not going overly stiff or low ride-height as to maintain some streetability and travel on bumpy roadcourses/backroads.
Perhaps slightly stronger damper rates in rear to contain the added weight residing back there.
Cheers,

vr4henry

Same plan here...

I'm worried we don't want to target GT3 specs since there's a bit of weight difference between the two (as you know).

993GT

I wouldn't worry about the weight too much in regards to spring rates, but definitely applies to the damper valving. IIRC, pre-2004 GT2's have softer springs/'weaker' valving than the GT3's. The choice of spring rate will also depend on how you want/will use the car and how you want it to behave.

vr4henry

Makes sense... the part I worry about is if I order 500/700 and get revalved for those, then really want 600/800.. do I need them revalved again? What's the threshold for this revalving specs.

Car is probably 80% HPDE track miles at this point.

993GT

Depends how quick you are/how good your feel is, an average driver using a valving setup of 500/700 will likely not notice a 600/800 setup on same dampers...
know too many guys obsessed with setup, personally want the car reasonably soft(maybe 500/700) to deal with any 'terrain' the car will see, better to spend time driving the car at the 'limit' than to be obsessing about exact setup, pro-racing results excluded...
damper/spring rates should also be selected(in addition to use/surface conditions) based on the tires one is planning on using.
I personally think the GT2's should be set at near GT3 spring rate setups, although the mid-corner speeds might be slightly slower, the out-of-corner acceleration traction provided by some squat(less spring rate) might help boost/reduce lap times...

pete95zhn

Quote from Rennlist...a post few years back by member x:

Now we have all spring rates for all GT3s.

FRONT:

996.1 GT3
PART NUMBER: 996 343 531 91
SPRING RATE: 35N/mm

996.2 GT3
PART NUMBER: 996 343 531 95
SPRING RATE: 40N/mm

996.2 GT3 RS
PART NUMBER: 996 343 531 97
SPRING RATE: 45N/mM

997.1 GT3
PART NUMBER: 996 343 531 95
SPRING RATE: 40N/mm

997.2 GT3
PART NUMBER: 997 343 531 94
SPRING RATE: 49N/mm



REAR:

996.1 GT3
PART NUMBER: 996 333 531 91
SPRING RATE: 65N/mm

996.2 GT3
PART NUMBER: 996 333 531 95
SPRING RATE: 95N/mm

996.2 GT3 RS
PART NUMBER: 996 333 531 95
SPRING RATE: 95N/mm

997.1 GT3
PART NUMBER: 997 333 531 93
SPRING RATE: 105N/mm

997.2 GT3
PART NUMBER: 997 333 531 95
SPRING RATE: 115N/mm


Also I wouldn't be surprized if one of the sets was the *or close to MY06-09 997 cup set considering they used the slick cup rain tyres.

FYI Cup was:
Fmain length mm - N/mm: 100-260 997.343.531.90
Ftender length mm - N/mm : 75–43 996.343.537.90
Rmain length mm - N/mm: 130-260 996.333.531.90
Rtender length mm - N/mm: 60-50 996.333.537.90

powdrhound

Factory spring rates on the 996.2 GT3 are 228lb front and 542 lbs rear.

DHI

Dan Jacob's Grrrage.
Revalved/resprung bilstein exchange program.
Call them for advice.