IntegraR0064

Not sure I understand what you're saying here...why would the height of the car change the rate of weight transfer?

sirbunz

FWIW, I have not ever been able to tell much of a difference in handling between an AP1 vs AP2 except for power, gearing, and steering (only slaloms, non CR). Our AP1 was the best handling STR car to date. This perked my interest after lots of seat time in AP1s ... despite the obvious changes (I actually have both sub-frames/arms as spares) I think this has been exaggerated from the driver's seat. On a road course, again, the same once you figure out aero.

I purposely left out body roll as that's something the springs and multiple other settings/setup will change. I still use a similar spring because the changes in ride heights, spring, changes, shock changes, bar changes, etc didn't seem to have a predictable pattern no matter what height we chase other than worse handling as the car got lower. Too low messed up suspension travel which I found very necessary on our bumpy lots. The S2k is low to begin with and I never felt any benefits of a lower CG in lower auto-x speeds. On track, it is much different, but aero is much more of a factor compared to an auto-x setup.

Also, we tried the soft spring/high ride height setup (see Nationals 2011) ... initially too much body roll, loose entry, loose exit (even with adjustments maxed)... added stiffer sway bars, created delayed response & robbed grip.

-Marc

sproutxj

Thanks for the advice everyone. I appreciate you weighing in with your experience. I have installed the KWs with 750/550 springs for now. I'm didn't go as low in the rear as suggested because its outside of the recommended height range and I was concerned about hitting the bumpstops. I can appreciate running at the edge of risk and I am far from a conservative driver. I push hard at my and the cars limits. This suspension stuff is all new to me but I'm learning quickly. I am only looking for a baseline that isn't dangerous at first. It sounds like with stiffer springs I should go with more rebound than recommended, I just don't know much much. I guess I'm just slightly skiddish about ending up with a totally unpredictable setup at first. I don't have the luxury of being able to have a testing session or two.

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steguis

Wohoo...more BSP S2000s.

sillyboybmxer

I might be as well too but my car is totally under prepped.

rrthorne8

no appreciative bump steer on ap2 at this height in my testing.
After a couple hours on the shock dyno, my recommendations are as follows.
From full stiff on each adjuster. I consider the first detent that engages to be position 0 (standing for 0 clicks from full stiff.)

front rebound -2, compression -5.
rear rebound -4, compression -6.

Front rebound adjustment is very course in this area. I dont think i would recommend moving from this position as the jump up and down one click is double or half the force. With the low front spring rate, you may have no choice but to drop the front rebound 1 click on rough surfaces. If you feel this is needed, i would consider softening the rear rebound 1-2 clicks as well. On street tires, i found that FR-3 and RR -5 felt very nice
Front compression, again not a ton of wiggle room, only adjusts very low speed compression rates. I would only recommend moving 1 click in either direction depending on how things are feeling, often a click stiffer will find you some mid corner front grip, but will cause a lack of compliance over anything bumpy (lincoln concrete )
Rear rebound, I would start with this adjustment if you want to play with a little transitional balance and on power rear grip (sounds backwards to some but hey its just one guys opinion and i cant control what works). I wouldn't recommend more then 1 click stiffer or two clicks softer (1 click stiffer is an equal change to two clicks softer as the adjustment is not linear)
Rear compression, If your going to venture somewhere, i wouldn't go more then two clicks softer and 1 stiffer

IMO, hope this helps

sproutxj

Thanks for your time and effort Robert. Greatly appreciated. I will report back after we thaw out up here in Montana. Good luck with your new ride.

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IntegraR0064

Just curious what your experience has been on the effect of rear rebound on transitional balance and on power rear grip - when would you increase it and when would you decrease? Are the settings you gave above more rebound in the rear or the front in terms of the force they put out on the dyno?

Rear rebound is one that I've just left alone for the most part.

IntegraR0064

Why not go to 12.75" ride height in the front? Are you just trying to clear the big tires, or is it shock travel, or are you intentionally going higher than you need to for some other reason?

rrthorne8

All good questions. I am basing it off of rake and the rear ride height assuming he doesn't want to slam the crap out of the rear and go buy an expensive rear bar. If you did 12.75" front, then i would recommend 12.25 rear and a 150lb rear bar and one hole stiffer on front bar. I am not however compensating for any tire clearance since the 285 will pretty much fit under anything
as always... IMO