Eibach/Bilstein vs. Stock/Boge or Bilstein...
Race Director
Joined: Sep 2004
Posts: 16,271
Likes: 82
From: Stockton, CA
bilsteins with stock springs is a VERY good combo for a street driven 928...better in the corners than the Boges, but not overly harsh.....even with larger 18" wheels
I have found street 928's with bilstein-eibachs overly bouncy on the street and just generally harsh....
But the cut eibach-bilsteins on my race 928 are GREAT...handles EXCELLENT....but I don't drive on the street either
I was impressed with the ride quality of an S4 with bilsteins and hypercoil 600F-400R..handles great on track and still has a nice ride...
I have found street 928's with bilstein-eibachs overly bouncy on the street and just generally harsh....
But the cut eibach-bilsteins on my race 928 are GREAT...handles EXCELLENT....but I don't drive on the street either
I was impressed with the ride quality of an S4 with bilsteins and hypercoil 600F-400R..handles great on track and still has a nice ride...
Thread Starter
Race Car
Joined: Jan 2010
Posts: 3,722
Likes: 5
From: Greensboro, NC
bilsteins with stock springs is a VERY good combo for a street driven 928...better in the corners than the Boges, but not overly harsh.....even with larger 18" wheels
I have found street 928's with bilstein-eibachs overly bouncy on the street and just generally harsh....
But the cut eibach-bilsteins on my race 928 are GREAT...handles EXCELLENT....but I don't drive on the street either
I was impressed with the ride quality of an S4 with bilsteins and hypercoil 600F-400R..handles great on track and still has a nice ride...
I have found street 928's with bilstein-eibachs overly bouncy on the street and just generally harsh....
But the cut eibach-bilsteins on my race 928 are GREAT...handles EXCELLENT....but I don't drive on the street either
I was impressed with the ride quality of an S4 with bilsteins and hypercoil 600F-400R..handles great on track and still has a nice ride...
Drifting
Joined: Aug 2006
Posts: 2,232
Likes: 12
From: lawrence,kansas
What about externally adjustable for compression and rebound.....then you could tune for street and then retune for competition, track or ORR. any one have any experience with penske, leda etc...I seem to remember TAHOE SHARK had penske I think
anyone know?
andy
anyone know?
andy
Racer
Joined: Sep 2006
Posts: 256
Likes: 1
From: Eslöv, Sweden
The option was standard on the GT and Club Sport cars.
The Club Sport had also stiffer springs in the front, 10% stiffer compared to the standard setup.
Give an idea how good the springs actually were for the 928 range.
Ragnar
Rennlist Member
Joined: Jul 2002
Posts: 3,269
Likes: 5
From: Deep in the Heart of Texas!
I'm going Bilstein with standard springs. My car came with M474 Boge Reds, from what people have discussed here, guessing this will be about the same in ride and handling ...
Thread Starter
Race Car
Joined: Jan 2010
Posts: 3,722
Likes: 5
From: Greensboro, NC
Thanks you everyone who has replied so far! Great info!
Rest in Peace
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Joined: May 2006
Posts: 9,903
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From: Bird lover in Sharpsburg
From looking at PET it looks like there are three different part numbers for the springs on my S4, does any body know what that means and how to tell which you have on your car?
Race Director
Joined: Sep 2004
Posts: 16,271
Likes: 82
From: Stockton, CA
Tim does have double adjustable Penskes on the Beast...but they are PRICEY too....around the cost of the set of bilsteins per SHOCK....
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Thread Starter
Race Car
Joined: Jan 2010
Posts: 3,722
Likes: 5
From: Greensboro, NC
Addict
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Joined: Jun 2003
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From: Helsinki, Finland
On production line only same group springs were used at same axle. Those cars which got more options only used two stronger group springs to compensate for heavier options. Springs have one to three paint markings which tell which group they are. WSM has values for each group.
When replacing individual springs same group replacement should be used or if not available both need to be changed. Thats why PET has option of ordering all three possibilities.
Rennlist Member
Joined: Mar 2007
Posts: 3,670
Likes: 76
From: Central Virginia
The aftermarket springs jar your eye teeth out on smooth roads. I have personally removed many sets from customer's cars after they complain about all the rattles and noises their cars have. You almost need a full time mechanic to follow the car around and tighten the stuff that comes loose from being beat by the suspension. IMHO they ruin the vehicles.
Rennlist Member
Joined: Dec 2004
Posts: 5,670
Likes: 1
Stock springs. Bilsteins. That combination will handle any corner that you are ever going to encounter on the street. If you are building a race car...then you need something else.
The aftermarket springs jar your eye teeth out on smooth roads. I have personally removed many sets from customer's cars after they complain about all the rattles and noises their cars have. You almost need a full time mechanic to follow the car around and tighten the stuff that comes loose from being beat by the suspension. IMHO they ruin the vehicles.
I put Bilsteins with stock springs in all of my hot rod 928 projects. Work great.
Other than that, I don't have an opinion.
The aftermarket springs jar your eye teeth out on smooth roads. I have personally removed many sets from customer's cars after they complain about all the rattles and noises their cars have. You almost need a full time mechanic to follow the car around and tighten the stuff that comes loose from being beat by the suspension. IMHO they ruin the vehicles.
I put Bilsteins with stock springs in all of my hot rod 928 projects. Work great.
Other than that, I don't have an opinion.
I have heavy springs and Konis on the 85. It rides well considering, but it is no longer a GT in any way.
Advanced
Joined: Aug 2004
Posts: 88
Likes: 0
From: Sevierville, TN.
Please correct me if I'm wrong. I believe Bilstein has regressive valving and Eibach has progressive.
A few questions about regressive/progressive for those that have driven both.
Can you feel the difference between the two types of valving on a bumpy road?
Can you feel the difference between the two types of valving on the track?
I'm guessing the regressive would be good for track because they start of harder and will help stay flat in corners. If a bump is encountered then it softens to absorb the bump
But at what point does the regressive soften? I'm sure it would for a pot hole at freeway speeds, but what about a speed bump in a parking lot driving 5MPH.
I'm also guessing, while track driving, the driver can’t turn the steering wheel fast enough to cause the regressive to go soft during cornering
Ron.
A few questions about regressive/progressive for those that have driven both.
Can you feel the difference between the two types of valving on a bumpy road?
Can you feel the difference between the two types of valving on the track?
I'm guessing the regressive would be good for track because they start of harder and will help stay flat in corners. If a bump is encountered then it softens to absorb the bump
But at what point does the regressive soften? I'm sure it would for a pot hole at freeway speeds, but what about a speed bump in a parking lot driving 5MPH.
I'm also guessing, while track driving, the driver can’t turn the steering wheel fast enough to cause the regressive to go soft during cornering
Ron.