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> Spring Identification, how's it done
76-914
post Mar 24 2013, 09:26 AM
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As revealed earlier, I don't know (IMG:style_emoticons/default/stromberg.gif) about suspension. I did know enough to listen to the pros and have taken Eric's set up advice. (guess who has new Bilsteins coming (IMG:style_emoticons/default/biggrin.gif) ) My question is this; how do I identify what I currently have? Is this done by the number of coils? Is it stamped somewhere? Color coded? Here is a shot of mine. And...what does 100,120,140lb represent? What happens at a given value? TIA, kent

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McMark
post Mar 24 2013, 10:48 AM
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If my math is right, I think all the stock springs listed below are around 150 pounds. AFAIK, the three variations are about 14 pounds between the lowest rate mentioned and the highest.

EDIT: I am wrong.


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Dave_Darling
post Mar 24 2013, 11:38 AM
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I think your math is wrong, McMark. Specifically, not accounting for the "P at L1 = 239mm". I believe they're talking about a pressure at a given spring length, though it is possible it could be a given amount of reduction in length.

The oldest info we have is that the stock springs are on the order of 60 lbs.


The way we rate springs in the US is in "pounds per inch". That means pounds of force that it takes to compress the spring one inch. Most springs are relatively linear in rate through most of their range, meaning that compressing the spring two inches takes twice as many pounds as compressing it one inch.

Some are "progressive rate" springs, where compressing the spring two inches takes more than twice as much force.

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76-914
post Mar 25 2013, 08:07 AM
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Hey guys, thx for the quick response but I guess you went over my head because I still don't know what I've got or what was said. I did find this but doesn't mention the 914. http://forums.rennlist.com/rennforums/924-...color-code.html Maybe someone could tell me who sells 140# replacement springs or how to test existing springs to determine which I have.
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ThinAir
post Mar 25 2013, 02:06 PM
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I'm wondering too about this. Since mine has non-stock shocks, I'm guessing the PO also replaced the springs. I'd like to be able to figure out what I've got.
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Dave_Darling
post Mar 25 2013, 02:27 PM
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The rate is "pounds of force per inch of deflection". That suggests how you would test it:

Weights to put on the end of the spring, and a ruler to measure how far it compresses. Take measurements with different amounts of weight.

lbs of weight / inches of compression == lb/in spring rate.

...Or you take them to a shop that has a spring tester, which does the same sort of thing with much more precision.

--DD
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McMark
post Mar 25 2013, 04:39 PM
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QUOTE
I think your math is wrong, McMark.

Yup. I was wrong. Found a spring rate calculator that takes into account wire size, number of coils, etc. And came up around 80 pounds. Of course, that's just rough numbers and for new springs. I don't have any idea of the rate of decay on spring rates. But between 60-80 pounds for stock springs may be about right.
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SirAndy
post Mar 25 2013, 05:47 PM
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QUOTE(Dave_Darling @ Mar 25 2013, 01:27 PM) *
Weights to put on the end of the spring, and a ruler to measure how far it compresses. Take measurements with different amounts of weight.

lbs of weight / inches of compression == lb/in spring rate.

(IMG:style_emoticons/default/agree.gif)

Measure spring length at rest. Put a known weight on top of the spring. Measure difference in length.

Plug the known weight (in lbs) and the difference in length (in inch) into the formula above, normalize to 1 inch and voila!

(IMG:style_emoticons/default/smash.gif)
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sixnotfour
post Mar 25 2013, 06:04 PM
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If those are KYB's it wont matter..
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r_towle
post Mar 25 2013, 06:06 PM
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Spring ID for the simple minded.

Remove springs, toss them.
Order springs you want, install them.
Now you know what you have installed.

Rich
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ThinAir
post Mar 26 2013, 12:03 AM
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QUOTE(r_towle @ Mar 25 2013, 05:06 PM) *

Spring ID for the simple minded.

Remove springs, toss them.
Order springs you want, install them.
Now you know what you have installed.

Rich

As I recall, 100 pound works well for 914-4 for street driving and once-in-awhile autocross or WCC track day. Any reason to go higher for such use?
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76-914
post Mar 26 2013, 08:37 AM
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QUOTE(SirAndy @ Mar 25 2013, 04:47 PM) *

QUOTE(Dave_Darling @ Mar 25 2013, 01:27 PM) *
Weights to put on the end of the spring, and a ruler to measure how far it compresses. Take measurements with different amounts of weight.

lbs of weight / inches of compression == lb/in spring rate.

(IMG:style_emoticons/default/agree.gif)

Measure spring length at rest. Put a known weight on top of the spring. Measure difference in length.

Plug the known weight (in lbs) and the difference in length (in inch) into the formula above, normalize to 1 inch and voila!

(IMG:style_emoticons/default/smash.gif)

I plan on doing just that after I drop the trailing arms. Then I'd like to follow up with a spring test by a pro to verify what I think I already know.

QUOTE(sixnotfour @ Mar 25 2013, 05:04 PM) *

If those are KYB's it wont matter..

They are and your right. Erc is sending me some Bilsteins. (IMG:style_emoticons/default/evilgrin.gif)

QUOTE(r_towle @ Mar 25 2013, 05:06 PM) *

Spring ID for the simple minded.

Remove springs, toss them.
Order springs you want, install them.
Now you know what you have installed.

Rich

I agree. I want 140# springs. Now tell me where to buy them.
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Dave_Darling
post Mar 26 2013, 06:38 PM
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All over. Performance Products, GPR, Pelican, AA.... Most of your favorite places (did I mention Pelican Parts?) will carry them if they carry 914 stuff at all.

--DD
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76-914
post Mar 27 2013, 07:55 AM
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Pelican lists them as NLA as did GPR but I didn't know about Performance Products. They have them for $90 ea., Thanks Dave
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Elliot Cannon
post Mar 27 2013, 11:26 AM
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I bought 165 lb. progressive springs From Troutman in Temecula. They were at 27831 Sycamore Mesa Road. 909 699 9277. That was about 10 years ago and I'm not sure they are in business anymore. I also got cross drilled rotors from them. Too bad if they're no longer around.
Cheers, Elliot
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Socalandy
post Mar 27 2013, 05:03 PM
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my Eibach 140's came from Pelican via Rebel Racing but they are for the coil over kit and the diam. is different from stock, call Glenn Sager X240
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SLITS
post Mar 27 2013, 05:28 PM
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QUOTE(Elliot Cannon @ Mar 27 2013, 10:26 AM) *

I bought 165 lb. progressive springs From Troutman in Temecula. They were at 27831 Sycamore Mesa Road. 909 699 9277. That was about 10 years ago and I'm not sure they are in business anymore. I also got cross drilled rotors from them. Too bad if they're no longer around.
Cheers, Elliot


Troutman moved to the East Coast. House has a caretaker & lots of Porsche parts but they have been gone though.

Springs / brake hoses are no longer being made.
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rgalla9146
post Mar 27 2013, 06:15 PM
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QUOTE(SLITS @ Mar 27 2013, 04:28 PM) *

QUOTE(Elliot Cannon @ Mar 27 2013, 10:26 AM) *

I bought 165 lb. progressive springs From Troutman in Temecula. They were at 27831 Sycamore Mesa Road. 909 699 9277. That was about 10 years ago and I'm not sure they are in business anymore. I also got cross drilled rotors from them. Too bad if they're no longer around.
Cheers, Elliot


Troutman moved to the East Coast. House has a caretaker & lots of Porsche parts but they have been gone though.

Springs / brake hoses are no longer being made.


Dont mean to hijack but could someone comment on the meaning of the various color paint dabs used on the OE springs ?
I know that I've read that yellow was for 914 6 specific springs. True ? if so what does red or green indicate ?
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ww914
post Mar 27 2013, 06:32 PM
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QUOTE(76-914 @ Mar 27 2013, 06:55 AM) *

Pelican lists them as NLA as did GPR but I didn't know about Performance Products. They have them for $90 ea., Thanks Dave


If you can't find your 140 lb springs, I have a pair that I bought a couple of years ago that I do not need.
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76-914
post Mar 27 2013, 07:01 PM
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QUOTE(ww914 @ Mar 27 2013, 05:32 PM) *

QUOTE(76-914 @ Mar 27 2013, 06:55 AM) *

Pelican lists them as NLA as did GPR but I didn't know about Performance Products. They have them for $90 ea., Thanks Dave


If you can't find your 140 lb springs, I have a pair that I bought a couple of years ago that I do not need.

Well Hell, PM me a price. That would be a win/win deal. (IMG:style_emoticons/default/beerchug.gif)
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