hans14914

I will be dropping the trans and rear suspension to do the TT replacement in the next week or two, and am looking to go ahead and refresh the suspension while I am in there.

I remember reading years ago about people buying fixed-rate springs from Eibach instead of the normal progressive rates (but with the same dimensions). It seems that this may be a better option cost-wise than going to the Hypercoil, and needing to buy the spaces/perches to avoid the rattle.

Doe anyone have part numbers or experience with uprated fixed rate springs for use with factory/Bilstein adjustment hardware?

Thanks,
Hans

Mrmerlin

I would suggest that you add a set of bilstiens and keep the stock springs...... simply put they work.
You might consider a set of drop links for the rear sway bar

hans14914

I have a 928SP rear sway bar going in to replace the already capable OTT links that are installed.

My current stock springs have 122k miles of use on them, and I am thinking that they have to be very tired. The Eibachs are cheaper than stock replacement springs, but I am not wild about the progressive rate. I would like to get fixed-rate springs with factory dimensions, but maybe just a touch more control. Something between stock, and the hard end of the standard Eibach prog coils.

Any thoughts?

Mrmerlin

Bill Ball has 200K on his stock springs and goes open road racing with his car, is that something you have in mind??
Just adding the Bilstiens will make the car tighter and it will be better on hi speed driving

RKD in OKC

Interesting. I prefer progressive rate springs.

Mrmerlin

RKD what do you do with your car??
X country trips or DE events ??
Just a DD ?

GlenL

I'm not aware of "straight weight' springs having been made in 10 years. They made them in the '90s, but I've never seen them for sale since I got my car is 2001. I've also looked for other spring that'd fit without success.

For what I know, ya got four options:

1) Stick with your springs.
2) Get other 928 stock springs.
3) Get the Eibach "928 Intl" progressive-rate springs
4) Go with a Hypercoil set-up

I'm actually running what I understand to be the straight Eibachs. Got them used with a set of used Koni's about 5 years back.

hans14914

I think I joined rennlist back in 2003 or so, and I cant recall hearing anything about the fixed rate springs since my "freshman" year, but figured someone would know of a direct replacement spring.

Does anyone have the dimension handy so I can call some of the reputable winders to see if they have something?

Thanks,
Hans

RKD in OKC

Mrmerlin—
DD, X country tours (slow) and trips (high speed), Autocross, and some DE track (but not much).

However, our local Autocross is on a 1.2 mile road course with a 400 ft skid pad where we put some tight twisty bits. It's more like time trials than your typical parking lot or runway autocross. Setup for our events makes a pretty good all round everywhere handling car because there are both high speed sweepers and tight twisty turns.

Racers like linear springs because it is easier and less expensive to set a car up for different tracks with different spring sets with different rates depending on the roughness of the road surface. I resign to the fact I am going to run only one set of springs everywhere and not change my suspension setup for different tracks or activities. Thats why I like progressive springs, they provide a more all round setup.

Another consideration for the torquey 928 is progressive springs on the rear of a rear will drive car put more power down without wheel spin.

GlenL

Racers like linear springs because progressive rates give odd behaviors in aggressive cornering especially combination turns.

RKD in OKC

I guess my 4 wheel drifting through combination turns just isn't aggressive enough to notice any odd behaviour.

Ispeed

I think the progressive eibachs are bouncy crap. What shocks have progressive valving?

Possibly RKD's adjustable Koni's when cranked up have enough dampening for the eibachs.

928autobahndreamer

IIRC Bill Ball had difficulty finding the right balance when replacing shocks though. I am also looking to upgrade the tired shocks and was considering doing the hypercoil 600/400 kit with the revalved Bilstiens to match the shock rate. I have heard very good things about this combo.

However, I am willing to entertain other options for a better handlling shark. Especially if it ends up more cost effective. My driving tends to be very aggressive back road drives through the country on 2 lane twisty blacktop trying to keep up with an insane Cayman driver with upgraded suspension, exhaust and engine mods. As is now, there is too much body roll and the car gets upset in transition under heavy braking and aggressive combo turns.

Unfortunately, out here in the midwest, I have not had the opportunity to try out sharks with other set ups, so I have to rely on experiences posted here.

Ispeed

You would love it for hard driving. I am biased of course...

ew928

What is so 'bouncy' about the Eibachs?


The 928 is not a race motorcycle. It has a car's suspension.