Question please..about rear susp.

Reg · 02-16-2002, 02:01 PM

Will adjustable springplates from an 82' SC fit my 1970 911t?

There are a pair on ebay currently that say "fit 72 and up", and well I thought the 70 to 73 cars were very similar.

I'd hate to bother bidding on the wrong items for my car. I am attempting to stuff 7" wheels in the rear and I unsderstand adjusting ride height will be much easier with these plates installed.

Thank You!

Reg

Early_S_Man · 02-16-2002, 02:33 PM

Reg,

They should fit any car back to '69 without a problem.

dtw · 02-16-2002, 03:09 PM

I think I saw those on eBay, those should be ok- only thing I can add is make sure you get the hardware, too. I got a "free" pair of adjustable springplates, but the hardware (dealer items only) cost $135.

By the way- you will get very little adjustment from these plates- just a "fine tune" capacity. If you want more adjustment, try getting the aftermarket ones. They cost more- $300- but would give you what you're looking for. Somebody help me out with the name brand...I forget.

pjv911 · pjv911's Garage

I put the aluminum control arms and the adjustable plate in my 69` and have 16x7 rear wheels with 225/50/16 pirelli tires. However on the right bump the pass side wheel just touch`s the wheelwell lip. And yes my camber is set very negative at 2.4 deg neg camber. The car will go back on the road in april and i plan to try a different brand of tire since they sometimes have different width`s dispite being called the same size. Does anyone have any suggestions on a brand and model tire to get. The car now has a antique set of P7`s on it.

Kurt Williams

marcesq · marcesq's Garage

The after-market adjustable spring plates are made by sway-a-way.

Stock plates adjust 3/4" from center in each direction. I believe that the sway-a-way's have double that, but thats from memory.

Tire clearance will depend on more than just ride height. Larger torsion bars will reduce the amount the car squats during acceleration and in turns. This will keep the tires from coming in contact with the inside of the wheel well. A 225/50 is the largest tire a narrow body can handle, and some cars require the lips to be rolled to clear the sidewall.

I guess what I'm trying to say is that make sure you look at all of the rear suspension components before spending time adjusting spring plates only to find that the tires still rub.

Good luck.

Reg · 02-16-2002, 07:15 PM

thanks again for the posts. Food for thought. I do not see any hardware listed with these plates. The fellow has a whole whack of stuff divied up on ebay... left plate , right plate and then the covers. No mention about the hardware.

Maybe he'd want extra $$ for that after the fact.

My car is on stands now, and I put one of my new 7's on without a tire to see how it looked and it looks like it wont work now.Clad with a 225, I can't see it.

I do know that brands vary quite a bit in their tire sizes. I am not sure why. I've seen 205's that were as wide as 225's.

02-16-2002, 09:08 PM

A bit of help on the tires.
Most manufactures have information on things like revs per mile, section width for a rim size etc.
Tire rack has the tables with this data.
www.tirerack.com
What you want to do is pick a brand and look up the specs for it.
This will help alot in "pre fitting" your combination.

Reg · 02-17-2002, 06:30 AM

trouble is , they do not have rev per mile in diff rim widths. Would a 205 60 15 not have a different overall diameter if on a 7" rim vs a 5.5" rim?

02-17-2002, 09:48 AM

Well I would have to say that is a none issue. Consider the changes air pressure make and the fact that the tires are loosing material when they go down the road (not very much). I would think that the difference would not be classified as a percentage but parts per million.
The revs per mile is used for callibrating your speedo when the percent of difference requires a change.
IE: changing profile from lets say 205 75R15 to a 205 55R15 or a 205 "O"R15 (O is for o-ring or forklift ride quality) This would be a significant change in revs per mile.

I would use the tables for section width when mounted on a specific rim width. That way you can get an idea if the specific wheel tire combination will work.

ClayMcguill · 02-18-2002, 08:00 AM

When fitting wide tires and wheels (7" or wider) and adjustable spring plates to an earlier chassis, one major area of conflict is the inner sidewall of the tire and the block on the spring plate that the bolt screws into to adjust the plate up and down.

Depending on the offset and backspacing of the wheels and the width of the tires, spacers may be needed to prevent rubbing at that point. Check carefully.