I'm curious to see what spring rates everyone is riding on their "SLAMMED" rides. From the other threads it seems like people on post their set up, but no one actually states their spring rates.

Reason I'm asking is b/c I was running Koni Yellows with Ground Control coilovers and top hats. The spring rates were Front: 430/lb , Rear: 350/lb and everytime I hit a small bump I'd hear a "bang" sound. Not sure if it's the UCA hitting the shock tower, but it just pissed me off b/c my car wasn't even that low compared to what I see here.

Does anyone else have this issue? There are no leaks of any kind and I have the adjustment set to just under full firm. Could it be that my shocks are blown? It's been like this since I purchased them new as a complete setup.

 

A loud bang is generally the UCA hitting the shock tower. Pull the front camber kit, if you have one. They kill available suspension travel. GC extended upper mounts also allow the UCA to hit the tower, and you might need to shim the bumpstop to prevent it.

It should be fairly obvious if you're hitting the UCAs regularly. The shock towers will have dents if so.

Those front spring rates probably won't be stiff enough for a slammed ride height. 500+ to tuck tire is a good start.

Plenty of people posted spring rates in the slammed thread.

 

OTS Konis are rebound adjustable only. Having them on full stiff does nothing to stiffen the compression stroke. It might actually be hurting as the shocks don't rebound as quick on multiple succeeding compressions.

 

cut the bump stops if you haven't yet, run 10k/8k spring rates. 10k/8k spring rates are ideal for a 2-2.5inch slammed ride while still maintaining decent ride quality. I was riding slammed with those spring rates for years and never had a too much of a problem with them. Your lower back def needs time to adjust though haha.

 

I ran 380 lb/in front and 450 lb/in rear springs on GC/Koni and was lowered like so, stock UCA's, and they never hit the shock towers. My shock towers have zero dents in them. And yes, I drove it like that alot, probably 30K miles on some pretty awful roads in some places.

 

Thanks Patrick. So are you suggesting with my setup I shouldn't be having a problem with UCA contact with the shock tower? Would tire/wheel size play a factor into this? The tires are 205/50/15.

I'm debating on whether I should send my shocks in to Koni to see if they are low in pressure.

 

...you might have them re-valved as well since off-the-shelf koni yellows are not meant to work with springs above 400lb/in.

 

500-550 lb/in is the accepted number, according to a H-T OG member who works/worked for Koni NA.

I ran 450 lb/in rear springs for awhile on my Konis. The shocks currently have about 185K miles on them and they're still working great.

 

Bump for more answers because I beieve I'm having the same issue. I have koni sp3 with 450f/375r 7in springs lowered with about a inch gap. I also have skunk2 camber kit. It doesn't happen all the time just on some occasions. Do my shock need service or longer bump stops?

 

skunk2 650lb front, pulled both adjusters, rear 350lb. stock shocks, rides so bad i get headaches, cant wait for the koni/gc!

 

bump

 

I just placed my order for AMR coilovers and am going to run 14K/12K spring rates for my CG.

 

Most likely the problem is the S2 camber kit. Toss it and put OEM upper arms back on and you probably won't have any more problems.

 

Yeah I'm most likely going to remove it. My question is for those that track the car how much negative camber is good and do you guys run front camber kits?

 

not a racer or anything, but most people perfer to have noithing less then 2 degrees of negative camber.

 

This question can't be answered "as is".

Track surface, tires used, driver preference, spring rates, and many other factors come into play in determining the optimal camber for track use.

Besides that, some racing classes don't allow use of camber kits anyway.

Testing with a pyrometer is a good place to start to figure out your exact camber needs though.

 

tHanks for the insight guys.