help. bouncy car

[325isdan]

hi all.


so I have ground Control on my 91 and an experiencing a really bouncy ride.

essentially it feels as if the rear shocks aren't doing their job. Typical push up and down on the rear and it doesn't get stiff.

because of this I replaced the koni yellows with new ones and have them now set to three half turns. mine seem to only go to 4 half turns. I had them set to 2 half turns before and still feels the same. Push on the rear and it doesn't get stiff.

Is this a sign the springs are toast?

I don't think I have the rear very low but maybe it is.




Any insight would be great.

thanks

[325isdan]

after looking more at it I'm starting to think that maybe my tires have soft side walls. I am assuming this will play a factor?

[325isdan]

after looking more at it I'm starting to think that maybe my tires have soft side walls. I am assuming this will play a factor?

I tested on my brothers e30 which has koni yellows and just lowered ebach springs and crappy tires and his is stiff so it's not my tires.

[squidmaster]

Did you get custom GC rates? If you replaced the shocks with brand new ones, then the only thing left on your list is the springs.

[LJ851]

I'm going to assume you are removing the bumpstops when you adjust and are actually turning the adjusters.

All you are doing with the adjustment is changing the rebound of the shock, it won't feel firmer when you push down because the compression damping is not adjustable.

[325isdan]

I have no clue about what the spring rates are as they came on the car. yes the bump stops removed from the dampers.

why then on every other car I can press on the rear and it will stiffen right up? front of the car feels fine.

[LJ851]

why then on every other car I can press on the rear and it will stiffen right up? front of the car feels fine.

Not sure what stiffen right up means. Maybe try explaining your problem another way.

If you gently sit on your trunk and the car moves down further than you like, you need stiffer springs.

[325isdan]

Not sure what stiffen right up means. Maybe try explaining your problem another way.

If you gently sit on your trunk and the car moves down further than you like, you need stiffer springs.

go to the back of your car. push the rear down and let it rebound. After 3 to 5 pushes the rear will stiffen up and you won't be able to push the rear down anymore. Mine on the other hand does not stiffen up even with band new koni yellows.

[LJ851]

go to the back of your car. push the rear down and let it rebound. After 3 to 5 pushes the rear will stiffen up and you won't be able to push the rear down anymore. Mine on the other hand does not stiffen up even with band new koni yellows.

The "stiffening up" you describe is NOT supposed to happen. That is the result of too much rebound damping and is actually pretty dangerous in a bumpy corner. It's also called packing, the suspension does not rebound fast enough to have sufficient travel for the next bump so it ratchets down until it is effectively solid and unable to absorb bumps at all.


I have H&R race with koni SA shocks that i have adjusted to match the springs , it does not "stiffen up" as you describe.

[325isdan]

The "stiffening up" you describe is NOT supposed to happen. That is the result of too much rebound damping and is actually pretty dangerous in a bumpy corner. It's also called packing, the suspension does not rebound fast enough to have sufficient travel for the next bump so it ratchets down until it is effectively solid and unable to absorb bumps at all.


I have H&R race with koni SA shocks that i have adjusted to match the springs , it does not "stiffen up" as you describe.

hmm I did not know that. thanks for clearing that up for me.

[DRTSRFR]

Get the numbers off of the springs and I can help you with baseline settings.

The spec's will be printed on the spring. IE; (xxxx.xxx.xxxx) or (GCxxx.xx.xxxx).

[325isdan]

cool thanks. I'll look for some numbers. correct me if I'm wrong but I've been reading and by raising the rear back up it should eliminate some of the bounciness? As you can see the front is much higher then the rear. The front is as low as it can go.

[DRTSRFR]

Raising the rear will help if you are getting into the bumpstops, by reducing that tendency.

As others have mentioned; it's more likely you are packing the spring because of over damping.

I'm assuming this is the Basic $1000 kit, with compress to adjust Konis in the rear...?

[325isdan]

I'm assuming it is the basic kit, red eibach springs. I'm not sure how I can be over damping the shocks since I had them set to the softest to med hard with the same results.

I guess a better way to describe it is I can push the rear down a few CM before the dampers engage.

I'm going to try raising the rear up and report back. I hope also by raising the rear it will reduce some wheel hop.

[325isdan]

OK so I got more info for you guys and thanks for the help.

Koni 80 2522SPORT

Ebach 0500.225.0600.0
also on the springs 255565

I couldn't get any numbers off my old shocks they were to rusty.

I did raise up the rear springs just to see and no change. So what is my best solution to correct my problem?