Trailing arm Issues WTF

[MrRPJ]

So I have a problem i just cant get my head around. I have 20mm spacer on the rear left and nothing on the right. but the 20mm on the lest is required to keep my fitment even. I measured from gearbox to axle mounts and the distance is the same so wtf is going on look how close the rotor is to the right wheel compared to the left. The thing thats got me baffled is the alxe distances are the same

[Omegaman]

Then the wheel offset must be different. Have you put a rear tyre on a wheel from the front?

[stownsen914]

Perhaps to keep tire/wheel clearance looking the same on both sides to account for small differences due to alignment or asymmetry in bodywork? 20mm is a lot though, almost an inch! Has the car ever had crash damage/repairs?

[T77911S]

if you are measuring the wheels in relation to the fenders and each side is different, that is normal.
I think I did different spacers on each side for my 77 widebody or I was seriously considering it just for aesthetics.

[gomezoneill]

Could it have anything to do with the non Porsche engine that's installed? Did you keep the 915?

[betterair]

""Has the car ever had crash damage/repairs?""

Bent trailing arm??
seems unlikely but maybe?

[Sboxin]

Originally Posted by MrRPJ

So I have a problem i just cant get my head around. I have 20mm spacer on the rear left and nothing on the right. but the 20mm on the lest is required to keep my fitment even. I measured from gearbox to axle mounts and the distance is the same so wtf is going on look how close the rotor is to the right wheel compared to the left. The thing thats got me baffled is the alxe distances are the same

IMHO - - it's just the body - - are you fitting the tire to the outside of the fender?
We have 2 Porsches that are not the same on both rear sides, a 2002 Boxster and 1978 911 SC . . .

We use different size spacers to correct the wheel/tire placement . . . not a problem.
I would suggest to use your 20MM spacer and not worry about it .

Regards,

[75 911s]

First off, I've been following your project build for a while and kudos to getting to this point.

There are a lot of factors involved in your spacing issue. The first that comes to mind is possibly different offset wheels. Swap them and check if there is any difference.

The second is your addon fenders. Didn't you recently put wide fenders on the back? Are they square and in the same position?

Another thing you might check is a broken TB. I saw a recent thread about this exact problem on the FB page and in several cases, it turned out to be a broken Torsion bar. I don't why or how that would affect the spacing, but something to check.

Keep us posted.

[MrRPJ]

Originally Posted by gomezoneill

Could it have anything to do with the non Porsche engine that's installed? Did you keep the 915?

Nar that just make the wheels spin while going past other porsches haha. No i ditched the 915 for a custom made transaxle

[MrRPJ]

Originally Posted by Sboxin

IMHO - - it's just the body - - are you fitting the tire to the outside of the fender?
We have 2 Porsches that are not the same on both rear sides, a 2002 Boxster and 1978 911 SC . . .

We use different size spacers to correct the wheel/tire placement . . . not a problem.
I would suggest to use your 20MM spacer and not worry about it .

Regards,

Thanks mate its really got me baffled so for now thats the plan I still have a bit to do to get it running. ill worry about it after rego.

Originally Posted by 75 911s

First off, I've been following your project build for a while and kudos to getting to this point.

There are a lot of factors involved in your spacing issue. The first that comes to mind is possibly different offset wheels. Swap them and check if there is any difference.

The second is your addon fenders. Didn't you recently put wide fenders on the back? Are they square and in the same position?

Another thing you might check is a broken TB. I saw a recent thread about this exact problem on the FB page and in several cases, it turned out to be a broken Torsion bar. I don't why or how that would affect the spacing, but something to check.

Keep us posted.

Thanks mate its been a long time coming. and yep i just fitted gt2 flares all measurements are equal both sides. i checked the torsion bar and its good.

Originally Posted by betterair

""Has the car ever had crash damage/repairs?""

Bent trailing arm??
seems unlikely but maybe?

These were my initial thoughts but no evidence of any repairs and we recently did all the floor pan measurements before we made the engine cradle and it was spot on. could one be a turbo arm??

[75 911s]

Originally Posted by MrRPJ

could one be a turbo arm??

There are several different arms out there.. I think they have casting numbers stamped in them. Turbo are different and SWB arms..also steel vs aluminum.

I read on another thread the bending tolerance is minuscule. So if it is a bent arm, it wouldn't be anywhere near 20mm. I think the tolerance is like 3mm before a crack or break on an aluminum arm. (con't quote me on that, but my point is, they don't bend much)

You also might just disassemble both sides fully and re-assemble. Everything down to pulling off the spring plates and pulling out the tb.

[T77911S]

i will say it again, if you are measuring from the wheel to the fender lip, it WILL BE different from side to side.
with the spacer on the left, the wheel will be further form the rotor


although looking at the right I don't remember my wheels being that far from the rotors. do you have custom wheels with more offset?

[rattlsnak]

Have you swapped wheels from left to right and see what happens to the measurements at that point?

[Eagledriver]

Alignment could affect the spacing. You might have some significant thrust offset.

-Andy