 Spring rates for a 3.3L Subie conversion, What do the 6 and 8 converts think? |
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| Chris H. |
 Dec 19 2012, 04:33 PM
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#1
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Senior Member  Group: Members Posts: 4,079 Joined: 2-January 03 From: Chicago 'burbs Member No.: 73 Region Association: Upper MidWest 
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I'm doing a 3.3L Subie conversion with a WRX trans using Ian's kit. Not sure the 90 lb rear springs are going to cut it, and they need to be changed anyway. What spring rate would be best? 250 hpish flat 6. Weighs about 350 lbs I think. Don't want my teeth rattled out, just want them to be strong enough for the job. Maybe the stock springs are OK I just don't know.
Build thread coming soon!~ |
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| wingnut86 |
Dec 19 2012, 04:38 PM
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...boola la boo boola boo... Group: Members Posts: 1,054 Joined: 22-April 10 From: South Carolina Member No.: 11,645 Region Association: South East States |
Chris,
I'm only looking at a 2.5L SOHC Subie with Ian's setup, and I'm seriously rethinking going back up to 140LB springs from the 90s I currently have. I'm searching for a spring rate calculator now, but share what you find on your end if you come across one that satisfies our setups. Dave |
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| TravisNeff |
Dec 19 2012, 05:02 PM
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#3
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region
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What do you have in the front, torsion bar size and sway bar? if so, what size?
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| Chris H. |
Dec 19 2012, 06:21 PM
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#4
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Senior Member Group: Members Posts: 4,079 Joined: 2-January 03 From: Chicago 'burbs Member No.: 73 Region Association: Upper MidWest
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Travis,
Stock setup now... not even a sway bar but plan to look for a later 911 front suspension with sway bar built in. I had planned to do a much smaller conversion (2.2) but the SVX came up cheap and I couldn't pass it up. Dave, I'll definitely let you know what I learn as well. I thought the 140# springs were hard to come by but maybe thats not right. |
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| Mike Bellis |
Dec 19 2012, 06:25 PM
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#5
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Resident Electrician Group: Members Posts: 8,348 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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I have 200lb progressive springs on mine. From the heavy V8 to the lightweight rotary. I love it. I have not driven with the Audi motor yet.
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| mittelmotor |
Dec 20 2012, 02:00 AM
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#6
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Member Group: Members Posts: 334 Joined: 21-May 12 From: SoCal Member No.: 14,464 Region Association: None |
I think 200-lb. springs would be nice, paired with 21-mm torsion bars up front. That's my setup with the LS1 V-8, about the same weight as yours. I've get Koni yellows set on full soft, and the ride remains pretty civilized, and I've yet to bottom out the rear suspension even at a slightly lower-than-stock ride height.
--Doug |
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| Van914 |
Dec 20 2012, 05:59 AM
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#7
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Van914 Group: Members Posts: 702 Joined: 5-January 03 From: Cincinnati, Ohio Member No.: 90 Region Association: Upper MidWest
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When I did my 3.0 conversion I used:
21 mm Torson Bars 19mm Sway Bar 180lb rear springs Koni Yellows Tarrett Polly Bronse Bushings Van914@aol.com |
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| TravisNeff |
Dec 20 2012, 10:40 AM
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#8
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region
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I would suggest for a decent ride and improved performance, add in a stock or 19mm front sway bar and 140lb rear springs. If your shocks are shot, replacing those while you are at it.
At 350lbs for the engine you are not much heavier than a stock, plus you will be adding some weight up front with the cooling system. |
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| jimkelly |
Dec 20 2012, 02:28 PM
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#9
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
i think i've read one say that a rear sway bar feels like an increase in spring rate.
these look nice http://www.ground-control-store.com/produc...hp/II=76/CA=217 |
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| andys |
Dec 20 2012, 03:36 PM
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#10
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Advanced Member Group: Members Posts: 2,165 Joined: 21-May 03 From: Valencia, CA Member No.: 721 Region Association: None
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QUOTE(jimkelly @ Dec 20 2012, 01:28 PM)  i think i've read one say that a rear sway bar feels like an increase in spring rate. these look nice http://www.ground-control-store.com/produc...hp/II=76/CA=217 Those Ground Control springs and perches are a good value for the money. I have a set on my car. 200# springs on a V8 conversion. Andys Attached thumbnail(s) 
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| Chris H. |
Dec 20 2012, 04:33 PM
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#11
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Senior Member Group: Members Posts: 4,079 Joined: 2-January 03 From: Chicago 'burbs Member No.: 73 Region Association: Upper MidWest
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Thanks guys! Great advice. Those Ground Controls look like the ticket. Definitely going with new shocks and struts as well. The rears are coughcoughcough..oldKYBs...coughcough... So I imagine the ride will be much smoother regardless. I assume the Boges up front are original.
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| nsyr |
Dec 20 2012, 06:13 PM
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#12
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Because I Can Group: Members Posts: 314 Joined: 16-May 04 From: Tampa, FL Member No.: 2,073 |
I have the svx engine with suby trans.
initially i had 165# progressive rate on bilstein hd and i had issues with tire rub. I then put on 185# progressive and it is holding up. i do plan on putting on collars and trying the 165s again. They just had a more comfortable ride. |
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| nsyr |
Dec 20 2012, 06:16 PM
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#13
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Because I Can Group: Members Posts: 314 Joined: 16-May 04 From: Tampa, FL Member No.: 2,073 |
Double post
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