Rinty

Mike, I don't recall ever reading a post here, by anyone that has an Eibach/FSD combination. But my memory is not what it once was...

FWIW, I have FSD's with M033s, and really like the combination.

But your major issue would be whether the FSDs will fit your Eibach spring lengths. Your safest bet might be to go with a length adjustable shock.

Tough decision.

993James993

What is a fair price to pay for installation, say for Bilstein HD's and springs?

P-daddy

I have heard as low as $650 not including alignment. Expect to pay about $1k with full alignment and corner balance (ballpark figure)

IXLR8

Rinty PMed me with answers to my Qs and pics of his Koni FSD/M033 set-up.

Before (stock ride height)...


After (Koni FSDs and M033 springs)...

CP

I am sure there is a price gap, but I have PSS9s and absolutely love it.

Here are some questions you have to answer for yourself.
(1) Is height adjustments important? If you are in SF, there are plenty of 'scrape' opportunities. Too low of a ride height could be a real pain. If that is an issue, the coil-overs are far easier to adjust.
(2) Are you **** enough to eventually want a corner balance? If yes, then coil-overs it is. BTW, make sure you corner balance before you do your final alignment set-up.
(3) Autocross. Are you serious enough to worry about shock stiffness and camber settings? If yes to shock, coil-over it is.
(4) If ride comfort is important, than coil-overs will be your best bet. With my PSS9s, my Ruf rides just as nice as my E35 M5 and the 997 Turbo. These are feedback from M5 and 997TT owners who really know suspension set-up and driving dynamics.

Good luck with your decisions.

BTW, I'm **** about my suspensions. My E39 M5 was the first M5 to get the Ground Control coil over system.

CP

Ice9

I just upgraded to the Bilstein HDs about a month ago and am extremely happy with them. For me cost was a consideration since it is an older car. The Bilsteins offer "better than new OEM (Monroe)" performance at a price point installed that is unbeatable.

IXLR8

I never came across that term till I bought a 993.

Why is it a "coil-over" and the OEM one on my car isn't. They both have a coil spring over my strut.

Just another buzz-word?

Ed Hughes

I didn't understand his post. Coil springs over shocks or dampeners, is our only choice, so I don't know how it could be a suggestion as "best bet" for ride comfort. In the 911 world, torsion bars provide the spring with a seperate shock doing the dampening. A few have modified to a "coilover" spring/shock setup by changing suspension components, but in essence, the configuration is what we have on these cars.

Neil Perry

Hi,
I had standard Monroes with Eibach springs and the pair did not work together, to car was a pig to drive, I replaced them with PSS10 and they are fantastic for some track work and every day road

P-daddy

Ride height looks the same or maybe a tad lower?

IXLR8

Rin mentioned that is was a tad lower.

CP

Hi,

http://en.wikipedia.org/wiki/Coilover

In talking about modifying suspension systems, coil-overs now connotes both shock stiffness and ride-height travel adjustments. If that is the case, you can 'tune' the shock firmness to suit your desire for ride comfort. You cannot do that with non-adjustable shocks mated to springs.

CP

IXLR8

My question to Koni was...

On the FSD page you state "FSD kit must be used with stock height suspension", then on the Our Products - FSD / Eibach Kits page, you state "Pair with Eibach springs for 1"-1.5" lowering".

You are contradicting yourselves. Can you explain which is correct?


Koni USA's Racing Technical Sales Rep. response was...

Yes, if on your pull down if we don't offer a eibach kit for our model, then they can't be lowered.

So for the Koni FSD shocks to operate properly, I take it they can only be lowered so much.

shldrdoc993

I upgraded to pss10 with M030 sways and set mine to euro height. I'd rec installing chris walrods front bushings at sametime also RS motor mounts. Call darin fister for parts. The addition of bushings and mounts for me this summer was signif improvement.

Kiwi01

I went from USA ride height stock w/ Boges to M033 + HD's lowered 1 inch. I looked into the Koni FSD but they didn't have the room to lower. The Bilsteins and M033 give me a ride that I have come to enjoy. It is more firm than the stock setup but it is not uncomfortable. My car is a daily driver and I do 3-4 DE's a year.

I also looked into the PSS 10's, they were out of my budget range and I would have likely driven myself crazy playing with adjustments :-) ... but if $ were no object I likely would have gone that way.

The springs and HD's were $1650 ... installation, alignment, test, adjust and realign $1000. I ended up having the springs wired to the perches just to make sure there were no issues. 1 DE and ~ 2000 miles ... I am very happy with my choice.

My advice would be to try to ride / drive as many setups as you can find and then be honest with yourself as to what you want the suspension to do ... good luck with your decision.