Stock Rear Spring Rate? |
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Stock Rear Spring Rate? |
detoxcowboy |
May 15 2009, 05:33 PM
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#1
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Senior Member Group: Members Posts: 1,294 Joined: 30-January 08 Member No.: 8,642 Region Association: Africa |
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 |
May 15 2009, 05:39 PM
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#2
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California |
I think stock is 100lbs. After 34 years?
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Larry.Hubby |
May 15 2009, 05:39 PM
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#3
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Member who doesn't post much, but has a long time in 914s Group: Members Posts: 186 Joined: 24-November 04 From: Palo Alto, CA Member No.: 3,172 Region Association: Northern California |
I believe all the 4 cylinder cars had 88 lb/in rear springs as stock items.
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bandjoey |
May 15 2009, 07:32 PM
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#4
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bandjoey Group: Members Posts: 4,925 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
what do the colored strips mean on the springs? Green? yellow?
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Dave_Darling |
May 16 2009, 09:33 AM
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#5
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
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 |
74914LE |
May 21 2009, 10:20 PM
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#6
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Member Group: Members Posts: 136 Joined: 6-April 04 From: Fort Worth, TX Member No.: 1,895 |
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 |
SirAndy |
May 21 2009, 10:39 PM
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#7
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Resident German Group: Admin Posts: 41,625 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
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 |
74914LE |
May 22 2009, 09:02 PM
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#8
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Member Group: Members Posts: 136 Joined: 6-April 04 From: Fort Worth, TX Member No.: 1,895 |
The set on the car are Black, with White KYB shocks.....
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SirAndy |
May 22 2009, 09:45 PM
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#9
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Resident German Group: Admin Posts: 41,625 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
with White KYB shocks..... That's why the fillings in your teeth are loose ... (IMG:style_emoticons/default/stirthepot.gif) Andy |
SLITS |
May 22 2009, 10:27 PM
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#10
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
KYB = Kill Your Back
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orcadigital |
May 22 2009, 10:50 PM
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#11
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Member Group: Members Posts: 59 Joined: 1-November 05 From: Elizabeth, CO Member No.: 5,043 |
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 |
May 22 2009, 11:18 PM
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#12
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Senior Member Group: Members Posts: 1,705 Joined: 8-April 06 From: Hesperia Ca Member No.: 5,842 |
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. |
Dave_Darling |
May 23 2009, 10:53 AM
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#13
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914 Idiot Group: Members Posts: 14,982 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
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 |
ArtechnikA |
May 23 2009, 01:54 PM
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#14
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
/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 |
johnhora |
Nov 25 2019, 11:34 AM
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#15
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None |
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sixnotfour |
Nov 25 2019, 11:51 AM
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#16
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914 Wizard Group: Members Posts: 10,423 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
Attached image(s) |
mepstein |
Nov 25 2019, 11:57 AM
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#17
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914-6 GT in waiting Group: Members Posts: 19,258 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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. |
Mikey914 |
Nov 25 2019, 12:05 PM
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#18
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The rubber man Group: Members Posts: 12,659 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
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. |
mepstein |
Nov 25 2019, 12:10 PM
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#19
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914-6 GT in waiting Group: Members Posts: 19,258 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
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. |
jmitro |
Nov 25 2019, 05:25 PM
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#20
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Senior Member Group: Members Posts: 713 Joined: 23-July 15 From: Oklahoma Member No.: 18,986 Region Association: None |
EDIT nevermind; looks like someone bumped it as a search
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