Looking for recomendations on spring rates and sway bar settings for pss9 with gendron 1.25 solid front and 1 solid rear ap2 car with 255 all around on enoki rpf1

 

Is this going to be an STR car?

If so, those wheels will be a problem.

 

yes i run autox in str. what will be the problem?

 

The offset is wrong. You need something closer to +60mm. As your driving gets more aggressive and you lower the car, the more likely you'll hit the fenders. And with the +45mm offset of the RPF1, it's bound to happen sooner than later.

I used 12k/10k (~676lb/560lb) Swift springs on my Bilsteins and it was good on autox/track and not too rough on the street. There is some good information in this thread regarding the Bilsteins https://www.s2ki.com/s2000/topic/766...gs%22__st__250

 

I'll have to read up on that thanks for the link. As far as low goes I love the stance of my car now with the eibachs that lower it 1.5 inches I don't think I'll want any lower in till it's a full track car. My fenders are rolled and I don't have any rubbing issues at the moment with the eibachs I really want the kw v3 but the extra 700 for them is makeing it hard

 

The Bilsteins can be revalved for any spring combination; other than the stamped steel body the internals are the same as any Bilstein racing shock. IMHO, a revalved Bilstein would be better than a KW although some may disagree.


The adjustment on the PSS9 is generally thought to be near useless. Bilstein does have some adjustable shafts that work, however I don't know if any would work with an S2k (most have spherical bearing eyes on the shaft), they wouldn't be cheap, and may have hood clearance issues. So a straight revalve would be the way to go. Guy Ankeny is famous for his autocross revalves, especially of the Bilstein PSS; Bilstein themselves also do it, about $135/shock I believe.

You can browse the STR threads for recommendations. Generally you will need offset upper boil joints (this is from Karcepts) to get the 3+° negative camber used in front. That also aids in tire clearance. The RPF01 may work with rolled fenders, but generally the PF01 with +60 offset or others (Kosei, TM3) with +60-to-+63 offset are used.

Springs themselves are fairly cheap. People run rates all over the place, but usually about 100-200lb/in (2-4kg/mm) stiffer in front. The most being run on the front seems to be in the 900 lb/in (16kg/mm) range but there are probably cars that are stiffer. The lowest seems to be around 600/450 (roughly 10/8). The anti-roll bars directly play a part in this also. With any spring change you will need to set the perches for ride height and cross weight; both affect handling.

Note that lowering affects the suspension geometry significantly and the jury is out on whether lowering helps or hurts.