suspension advice
Drifting
Joined: Apr 2008
Posts: 2,650
Likes: 3
From: Calgary, Alberta
...what are folks experience with Eibach springs and Koni FSD combination...mikej
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.
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Joined: Nov 2010
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From: MD
Race Director
Joined: Jun 2003
Posts: 15,122
Likes: 337
From: Los Altos, CA
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
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
Track Day
Joined: Jul 2003
Posts: 18
Likes: 0
From: San Francisco
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.
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Joined: Sep 2009
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From: Canada & the Alps
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Joined: Jul 2002
Posts: 16,557
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From: Bend, OR
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.
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Racer
Joined: Jul 2010
Posts: 416
Likes: 0
From: Sydney Australia
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
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
Rennlist Member
Joined: Nov 2010
Posts: 7,018
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From: MD
Race Director
Joined: Jun 2003
Posts: 15,122
Likes: 337
From: Los Altos, CA
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
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Joined: Sep 2009
Posts: 8,683
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From: Canada & the Alps
Response from Koni on the FSD...
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.
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.
Advanced
Joined: Jan 2010
Posts: 85
Likes: 0
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.
Rennlist Member
Joined: Nov 2004
Posts: 218
Likes: 41
From: ... Westminster, CO
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.
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.