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Eibach Spring Specs

 
Old 09-24-2017, 07:42 AM
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Red Flash
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Default Eibach Spring Specs

Hi All

So, I am going to start going through the 91GT. One of the tasks will be updating the springs and schocks to Eibachs and Konis. I have this on the 90 and love it.

I have some Eibach that look like new. Does anybody now the free length of these springs? Can I do any tests on them to verify condition?

Cheers and thanx in advance!

John
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Old 09-30-2017, 11:24 AM
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vfrv4
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Default eibach free length

Hi,

I have a set of never mounted eibachs from the 928intl run about 5-6 years ago. There other other sets running around a little older that are slightlty different.

The specs on theses are:

front free length : 10 1/2 inches and weight progressive 399-559 lbs.

Rear free length: 13 3/4 inches and weight progressive 285-372 lbs.


The only other way to test is a spring/shock dyno. Perhaps a local race shop can test for you if concerned or free length doesnt match above.

Note: the eibachs will "settle" a little with use..so a length 1/4-3/8 inch lower than above, i wouldn't worry about.

My springs will get 1 coil cut and mounted on the 79 track car this winter.

Last edited by vfrv4; 09-30-2017 at 02:02 PM. Reason: confirmed spring weights.
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Old 09-30-2017, 12:02 PM
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Originally Posted by vfrv4 View Post
The specs on theses are:

front free length : 10 1/2 inches and weight progressive 399-559 lbs.

Rear free length: 13 3/4 inches and weight progressive 285-375 lbs.
Really? Those are really stiff to start with.
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Old 09-30-2017, 01:52 PM
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Are you questioning the cutting of one coil for a dedicated track car? I have read posts where others have had trouble getting a lower track height, below 165mm with as delivered heights due to the spring being stiffer and a stripped 200-300 lbs. lighter track car (as my car is).

Do you have a different experience, or seen other?

The spring weights confirmed from Marks original for sale thread.
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Old 09-30-2017, 02:15 PM
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Originally Posted by vfrv4 View Post
Are you questioning the cutting of one coil for a dedicated track car?
No... I'm questioning if those are the real spring rates.

Porsche didn't spec their springs in a normal way so people have had to measure and guess. Generally, the stock springs are thought to be around 215 lb/in in the front and 120 lb/in in the rear.

I'm running 450/275 on my street/track car and it's, at once, too stiff for the street and not quite stiff enough for the track. That's with Koni's set towards hard.

The spring rates given for the Eibachs would be very stiff for the street. Going with soft shocks alleviates that a bit but that'd trade-off the benefits.
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Old 09-30-2017, 03:10 PM
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Sorry for threadjack Redflash!

Glen: interesting info...I'm guessing the eibachs are measured different than a straight rate or other if your spring rates are as reported. Many eibachs are running on the street with just reports of firmer, not spine breaking.

hmmm???
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Old 10-03-2017, 07:52 PM
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I'm running Eibachs with Boges and it has a great ride...not to harsh at all. I've had issues with clearance and have had to raise the car several times...I do appreciate the rake it puts on the car.
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Old 10-03-2017, 10:01 PM
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Hi All, thanks for the posts. I Am going to measure my free lengths and post tomorrow. I am not sure I can anything to the spring rate discussions. In any case, mine also have 928 Int stamped on them. There are also versions without the stamp and I also wonder what the differences are... John
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Old 10-05-2017, 04:10 PM
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So, the poor perspective makes it difficult to read the ruler at the staight edge and distorts the relative sizes of the springs.

But, the freelength of my front spring seems to be 33.8 cm.



The rear spring seems to be 27.2 cm.



These springs again are marked with 928 Int and appear to be almost new. So, I am not particularly worried about them being out of spec. I just know they are slightly used and heard also that there is at least one other version of Eibach spring out there.
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Old 10-06-2017, 12:13 AM
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Red flash
rear springs are the longer ones
I am running Eibach springs and Koni shocks
I also have stiffer F and R sway bars
I find the ride firm but not too harsh
the test is that my wife doesn't complain
and have been auto crossing with good success
If I want a soft ride I drive my MB
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