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> Stock Rear Spring Rate?
detoxcowboy
post May 15 2009, 05:33 PM
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I would like to know the stock rear spring rate for a 74 914 2.0 w/ perforomance package.. the black springs with the green paint....
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EdwardBlume
post May 15 2009, 05:39 PM
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I think stock is 100lbs. After 34 years?
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Larry.Hubby
post May 15 2009, 05:39 PM
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I believe all the 4 cylinder cars had 88 lb/in rear springs as stock items.
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bandjoey
post May 15 2009, 07:32 PM
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what do the colored strips mean on the springs? Green? yellow?
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Dave_Darling
post May 16 2009, 09:33 AM
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According to an old Up-Fixin Der Porsche article, the stock springs could be as stiff as 65 lb/in. I think most were less.

--DD
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74914LE
post May 21 2009, 10:20 PM
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This brings up a great question. How do you tell what the rating is on the springs mounted in a particular car? I recently baught a car that I know has much stiffer
than stock springs, but other than the fact that the fillings in my teeth are loose,
how can it be determined? Number of coils/OD of the spring/Un-mounted length?

The 100lb springs always seemed about right when matched with Koni or Bilstein, but what I have now, must be way north of that rating
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SirAndy
post May 21 2009, 10:39 PM
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QUOTE(74914LE @ May 21 2009, 09:20 PM) *

This brings up a great question. How do you tell what the rating is on the springs mounted in a particular car? I recently baught a car that I know has much stiffer
than stock springs, but other than the fact that the fillings in my teeth are loose,
how can it be determined? Number of coils/OD of the spring/Un-mounted length?

The 100lb springs always seemed about right when matched with Koni or Bilstein, but what I have now, must be way north of that rating

Your shocks don't happen to be white, are they?
(IMG:style_emoticons/default/idea.gif) Andy
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74914LE
post May 22 2009, 09:02 PM
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The set on the car are Black, with White KYB shocks.....
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SirAndy
post May 22 2009, 09:45 PM
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QUOTE(74914LE @ May 22 2009, 08:02 PM) *

with White KYB shocks.....


That's why the fillings in your teeth are loose ...
(IMG:style_emoticons/default/stirthepot.gif) Andy
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SLITS
post May 22 2009, 10:27 PM
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KYB = Kill Your Back
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orcadigital
post May 22 2009, 10:50 PM
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Weren't there 3 spring rates from the factory, with 1, 2, or 3 green dots? They ranged from 65 to 96lbs i "thought".
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BMXerror
post May 22 2009, 11:18 PM
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QUOTE(SLITS @ May 22 2009, 09:27 PM) *

KYB = Kill Your Back

Agreed! I had KYBs with floppy silly putty springs of some sort on them when I bought the car. Then this year I went to Konis and 200 pound rear springs, and my ride got smoother! (IMG:style_emoticons/default/dry.gif) Hijack over.
Mark D.
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Dave_Darling
post May 23 2009, 10:53 AM
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QUOTE(74914LE @ May 21 2009, 09:20 PM) *

This brings up a great question. How do you tell what the rating is on the springs mounted in a particular car?


Step 1: Remove them from the car.
Step 2: Put them on a spring tester.
Step 3: Read the results.

You can change out steps 2 & 3 for putting weights on the springs and measuring their deflection, but it's a whole lot easier to take them to a shop with a tester.

--DD
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ArtechnikA
post May 23 2009, 01:54 PM
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/4's were "a little more than 50"
/6's were "about 60"
GT's were 70/80/90 soft/medium/hard

There are formulas for determining theoretical rates for steel coil springs - Carroll Smiths' and Paul Van Valkenburg's books have them. An old spring will probably have settled but that doesn't change its rate, just its free length.

The table of data with 'what the dots mean' can be found here: Charlie Davis' 914 spring rate web page
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johnhora
post Nov 25 2019, 11:34 AM
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sixnotfour
post Nov 25 2019, 11:51 AM
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mepstein
post Nov 25 2019, 11:57 AM
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Stock front torsion bars, 100lb rear springs, Bilstein HD shocks and oem size sway bars make for great handling that is still very comfortable.

It's very common to see people up the spring rates because they think more is better but you don't get grip when the car is so stiff it bounces off the ground on every bump. It happens a lot in the 911 world because guys don't realize how increasing the torsion bar size ramps up the spring rate. So both ends get increased by 50-100% with just a couple mm change. Big sway bars also affect the ride as well as stiff bushings.

I've also lowered my tire pressure over the years since most psi suggestions are for heavier cars.
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Mikey914
post Nov 25 2019, 12:05 PM
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I'd agree the 100 for the stock 4 is perfect.
However there are those that have heavier motors. I know Eric used some 200s at one point, but the 140/160 I think is a good complement to the additional weight.
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mepstein
post Nov 25 2019, 12:10 PM
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QUOTE(Mikey914 @ Nov 25 2019, 01:05 PM) *

I'd agree the 100 for the stock 4 is perfect.
However there are those that have heavier motors. I know Eric used some 200s at one point, but the 140/160 I think is a good complement to the additional weight.

(IMG:style_emoticons/default/agree.gif) I think Ben is using 140 on his 2.7 car and I have 160 on my 3.2 car and trying 180 on my Suby six. It's all subjective but I think guys are too quick to go to 21mm torsion bars on the front for a road car.
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jmitro
post Nov 25 2019, 05:25 PM
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EDIT nevermind; looks like someone bumped it as a search
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