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Bushing replacement - priorities?


aeshultz

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I'm planning on freshening my suspension for this season, and want your opinions on replacing bushings - which should be my priorities? Car is an '83, former SCCA ITS car w/ 84K miles but I'm assuming that most of the bushings are stock - I haven't changed anything since I bought it already built.

Which areas should I upgrade fist? Thanks,

Alan Shultz

Columbus, Ohio

 

Edit - Car is a 944Spec / SP-1

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Hi Alan:

 

If you are running original stock bushings, upgrading here is a good place to start.

 

What class u select to run in will make a difference in which type of bushings you can use.

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I had some delrin bushings made for my 83. I had Weltmeister bushings first, but the metal control arm cut through the soft plastic. I am refering to the cross member bushings. There are a couple places that sell delrin cross member bushings, but I am getting a few more sets made if you are interested in one.

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delrin in the crossmember welt reds in back is the popular setup. its also the setup i was kind forced to take after power steering fluid drenched and dystroyed my stock rubber. ohh well. these bushings helped with response and feel so much it was like a completly different car... even with no power steering and very old suspension parts the thing feels way more responsive then my 02 ford focus SVT... and thats acctually saying something...

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Alan,

You can go to spherical bushings, but that will limit you choices when racing with different orgs.

If you stick to "non-metallic" bushings , you can race with PCA and NASA.

I also use red Welts in the rear on the front control arms. I swap out the aluminum arms in front for the steel ones. Don't bust your butt trying to remove the opld bushings from an old steel arm. Just buy a new steel arm. They're cheap. I use Delrin whites in the crossmember. These come about 1/16th inch too big so you'll have to file them down to fit.

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I'm planning on freshening my suspension for this season, and want your opinions on replacing bushings - which should be my priorities? Car is an '83, former SCCA ITS car w/ 84K miles but I'm assuming that most of the bushings are stock - I haven't changed anything since I bought it already built.

Which areas should I upgrade fist? Thanks,

Alan Shultz

Columbus, Ohio

 

Edit - Car is a 944Spec / SP-1

 

For an 83 SP1 car do the following.

 

Front

- Replace the steel control arms with new ones. These can be purchased for $25 each. Then get new ball joints for $11 each. Infact buy 3 so that you have one spare at the track (they are the same for left & right sides)

- Bushings

Crossmember to A-arm. Go with Delrin from racer's edge. They are the only non metailc bushings that will last. I have been through all the rest (rubber and 2 type of poly) before I had Karl make these. I have the first set of these ever made (installe din 2003) and they will out last my control arms.

A-arm to frame - AKA Casterblock. Here you can go with weltmeister red poly bushings. Delrin is not offered due to the wide range of tolerances on the arms and potential binding. The red welts are perfect here as they are complant enough to allow for some miss alignment. They will also last for a long time.

 

Strut Top - replace with camberplate and take out all the rubber. Simple and effective

 

The other rubber in the front is sway bar and steering rack. Sway bar will be depend on which sway bar you use. Welts come with rod ends and metal to metal mounts as part of the standard install kit. 968 M030 or other stock style bars may have rubber mounts, but these can be replaced.

 

Rear.

Other the rear sway bar the only place you can replace bushings is in the t-bar spring plate and from t-bar carrier to tub. The tub bushings can be replace with poly bushigns and will work fine. Replacing the spring plate bushings is job best done only when doing t-bars. Reason is the t-bars need to come out to swap bushings. I have used weltmeister poly bushings with good success here. Mount from the semi trailing arm to t-bar carrier is stock however.

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Thanks all- That's exactly the kind of advice I was looking for. Doesn't looks as though I'll be racing this spring- plans are to renew the suspension and then the license summer or fall, depending on how things go.

Can't wait to get out there.

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