Ispeed

Having had the Bilstein/Eibach set-up for 2 years now, I swapped the springs for the non progressive 600/400 Hypercoils from Carl Faucet.

Why did I want to do this? I wanted to get rid of the mushy feeling that the progressive Eibachs give. The first like 1 to 1.5" of suspension travel is soft before the springs stiffen up, and I wanted a more firm feel from the suspension.

Anyways, I have a few drives on the new Hypercoils and the verdict from me is 100% good. The ride quality is not too different from the Eibachs, but body pitch and roll and brake dive are minimized. MUCH better in that respect. We only have a few inches of suspension travel to use anyways, and I don't want to give up too much right off the bat with the weight of the car pushing through the progressive part of the Eibach springs.

The Bilsteins seem to have enough dampening for the stiffer springs, and for $65 a corner Bilstein in CA will revalve for more compression and rebound if not.

Not so fat, not so lazy 928...

IcemanG17

I just think 600/400 hypercoils would right soo stiff (for the street).....I rode in a 928 with the bilstein/eibach (399 to 550 front progressive)...& It did not ride well at all...way too jiggle for me.....now the same car with stock springs and the same bilsteins is a nice combo....firm in corners, but still with a nice ride.....I really would like to ride in a 928 with heavier springs-shocks and 18" tires...to see how it feels.....

I'm happy with my 100% stock boge grays.....but a touch more bounce control in rough corners would be nice!

Bill Ball

Oh, I didn't know that. And thanks for the report on the Hypercoils. I like the Bilsteins and stock springs, but I am feeling the need for less roll in open road racing. I would like to lower the car but still be able to handle the funrun twisties w/o banging the front spoiler on the bumps.

Ispeed

The guy to contact at Bilstein is Bill Hindorf at 800-537-1085. He says that either rebound or compression can be changed (or both) by any amount like 15%, 20% etc. A rebuild or revalve is $65 each shock. They dyno them before shipping them out.
I want to do another run on "God's race track" the Blue Ridge Parkway before I am done thinking about suspension.

Everybody that goes to the track says to get adjustable Koni's, but I like Bilsteins and am not sold on doing that, and would rather have a good setup and leave it that way.

IcemanG17

Bill
What about stiffer roll bars in front and drop links in rear......that way your ride remains the same (very good)....but less roll?

I would like to ride in a hypercoil'd 928 on our roads with moderate springs like listed above......to feel the differences......

Having a bilstein setup that is set once and done.....thats nice

Bill Ball

I'm not a fan of swaybars. The transfer function bothers me, as overall you lose traction. Moderately stiffer springs and better bump control in the shocks would probably make me happier.

Jim bailey - 928 International

So Bill ..."I'm not a fan of swaybars " did you take OFF your stock swaybars ???

Bill Ball

No, I took off the stiffer aftermarket front bar after driving with it for a couple of years and put the stock one back on. Even the stock swaybar is pretty big.

Tahoe Shark

[QUOTE=IcemanG17]I really would like to ride in a 928 with heavier springs-shocks and 18" tires...to see how it feels.....

QUOTE]

I think you have done that!

IcemanG17

[QUOTE=Tahoe Shark]Tim
I can check the 1000+lb springs, custom Penske shocks 928 off my "928's I need a ride in list!"

Which was a surprisingly good ride.....possibly better than the bilstein eibach setup I rode in? I just wonder what a less aggressive setup would be like....like the 600-400 springs above?

Ispeed

I am used to a stiffer ride, and to drive a 928 with original springs and shocks feels like a passenger car to me now. I think the 928 does really well with a much firmer ride.

I have to remember that my car is not to be a race car, and needs to be streetable. Otherwise I am so tempted to go even stiffer. I think the 600/400 will be enough for spring rates especially because of how bad the roads are here in the northeast. Those rates were what Carl Faucet recommended when I called up looking for 750/500 and he seems to be right.

Bill: I can't believe you do open road racing with stock springs. I would imagine you ground out with the extra G forces at speed.

Bill Ball

George Suennen runs stock springs (and stock swaybar) at 190MPH. His car handles the high loading on the turns remarkably well. His car is much lower than mine. I've been baised against lowering the car, probably incorrectly. I had a horrible experience with Konis (I know, everybody else has had good results with them). I blamed part of the handling issues (bottoming on turns) on the fact that my car was lower. So, I moved the car back up to stock ride height (looks like a 4x4). That got rid of all the bottoming. Now, with the Bilsteins the car is handling pretty well, but I still have some excess lean on very high speed sweepers (over 140MPH) that I think is because the car is so high. Anyway, my next experiment is to take the car down quite aways, realign and see how it does.

drnick

i swapped away from the eibach progressive springs for the same reason - the squish before they firm up - but i do think they are a good spring for the street. ive got 650/425 hypercoils with bilsteins that are custom valved and biased to the track, it is stiff on the street. i didnt think the standard bilsteins had enough rebound damping for the stiffer shocks.

ive just faced the issue of updating my 79 car which will stay on the street and ive gone for koni shocks this time mainly for a comparison, along with some 550/350 hypercoils i already had. if i ever update the suspension on the track car i will go for leda - as long as they are operational.