joe v3sti

iTrader: (8)

Hiya guys I'm looking for an alternative to p1 springs due to their rarity and cost.

Does anyone know what rating the springs are ?


Cheers joe

AshMurc

Great idea mate, i would be interested in what you find (i'll have a look too!)

I was on NASIOC the other week and happened to make a note of the spring rates stated in one of the threads: 215 lb/inch front, 195 lb/inch rear. AFAIK..... be worth getting a couple possitive confirmations on that.

I presume they are linear in rate too as a few people have been banging on about the rising rate springs being mushy at full travel to crashy and hard as you go through the stroke, yet all seem to rave about P1 springs.

joe v3sti

iTrader: (8)

Yeah the p1 ones are linear, I've been looking at these.

http://www.rhdjapan.com/sti-coil-spr...preza-gc-55492

AshMurc

hmmm...interesting find!

so by my calculations for front spring rates 3.6kgf/mm = 200 lbf/inch, and 4 kgf/mm = 223 lbf/mm

so provided my P1 spring rates and my calculations are correct we can go a bit harder or a bit softer then P1s.... i might be interested in the 4 kgf/mm front.

But for the rear 3.3 kgf/mm i think is 185 lbf/inch so we would be 10lb stiffer at the front and 10lb softer at the rear... Not sure i like that difference in balance. My old wrx wagon has a smaller difference betwwen F &R spring rates comaped with the saloons which is probably why the wagons are a bit more tail happy (you can spin the thing with lift off oversteer in the dry if you are leaning hard and in the wet have to really watch you arn't still on or transitioning from the brakes as you start to turn in. Been there got the tshirt haha!)

AshMurc

or could go 3.6 F and 3.3 R which would retain similar balance to the P1s but softer overall. If you had carried out a decent bit of weight saving it might be a good setup

2pot

iTrader: (3)

P1 springs are 194lb/in front 157lb/in rear.