Tyre hitting wheel arch

Brucey · **Posted:** Tue Dec 01, 2009 2:54 pm

Hi all, I've had my 944 for about 8 months now and when I first got it I noticed if I opened it up and changed from 1st to 2nd it would squat so hard the tyre would hit the arch. Now I know this aint right but as I don't thrash it and have since improved my gear change technique it has'nt been a problem up until recently when I had the rust repaired on the drivers side rear arch, now every time I hit a bump or cornered quite hard it would hit :evil:

So I took it back and he narrowed the inside of the arch for me and it still hits :twisted:

The last straw was last night when I took two of the lads off my watch to the fire station in Manchester city centre for our christmas p#ss up. The journey was horrendous although funny as one of them is 6ft 2in and the other is 6ft 4in :lol:

I have'nt gone back for my car yet but will be shortly as I'm on tonight and am dreading it as when I left it appeared to be sitting lower on the drivers side.
As I am by no means a mechanic and am still learning I would love to hear your ideas. P.S I should point out it has 255 rear tyres on boxster wheels.

Pastry · **Posted:** Tue Dec 01, 2009 3:18 pm

Brucey wrote:

I should point out it has 255 rear tyres on boxster wheels.

that'll most likely be the problem; bit fat for a 944, turbo has 245s iirc and rolled arches. my 2.5 n/a is on 225 rears on 8j rims.

standard for a 2.5 n/a was 7j rims all round on 215 or 195. but the rears sit under quite a bit with them.

mind you if its sitting unevenly then suspension isnt right either.

Brucey · **Posted:** Tue Dec 01, 2009 3:23 pm

Pastry wrote:

Brucey wrote:

I should point out it has 255 rear tyres on boxster wheels.

that'll most likely be the problem; bit fat for a 944, turbo has 245s iirc and rolled arches. my 2.5 n/a is on 225 rears on 8j rims.

standard for a 2.5 n/a was 7j rims all round on 215 or 195. but the rears sit under quite a bit with them.

mind you if its sitting unevenly then suspension isnt right either.

Could I put 245 tyres on my wheels?

stepa1007 · **Posted:** Tue Dec 01, 2009 3:34 pm

I have 255 tyres on 9j rears on my Rose (944 Turbo S).
The wheels are 17" CUP 2's (55 offset) from my 928 GTS and Rose cars had rolled rear arches.

Are your 'Boxster' wheels 17"?

Live and breathe the Marque,
Stephen

Brucey · **Posted:** Wed Dec 02, 2009 10:53 am

stepa1007 wrote:

Are your 'Boxster' wheels 17"

Yes.

stepa1007 · **Posted:** Wed Dec 02, 2009 11:30 am

What is the offset?
I dont think you 245 is a standard width for 17" tyres.
I think the next common size down is 225.

Ask at your local tyre store.
You willl need your rim widths to check if the tyre is within the recommended fittting range.

Stephen

Brucey · **Posted:** Wed Dec 02, 2009 11:52 am

stepa1007 wrote:

What is the offset?

You may as well be talking chinese to me now mate :lol:

I think the first thing to do is to replace the rear shocks as it's obvious that they're goosed. I can only just slide my finger under that arch and just about two under the other.
Is this gonna be mega bucks?

stepa1007 · **Posted:** Wed Dec 02, 2009 12:34 pm

Yes better to do that.
See the current post about shockers.

Stephen

tr7v8 · **Posted:** Wed Dec 02, 2009 12:54 pm

Brucey wrote:

stepa1007 wrote:

What is the offset?

You may as well be talking chinese to me now mate :lol:

I think the first thing to do is to replace the rear shocks as it's obvious that they're goosed. I can only just slide my finger under that arch and just about two under the other.
Is this gonna be mega bucks?

Off set of wheels will be marked on them as ETxx that is what Stephen is talking about.

Shocks will make no difference to the ride height, I suspect that either the torsion beam mountings are knackered or more likely the torsion bars need reindexing.

Brucey · **Posted:** Wed Dec 02, 2009 12:57 pm

tr7v8 wrote:

Shocks will make no difference to the ride height, I suspect that either the torsion beam mountings are knackered or more likely the torsion bars need reindexing.

Expensive?

tr7v8 · **Posted:** Wed Dec 02, 2009 1:06 pm

Brucey wrote:

tr7v8 wrote:

Shocks will make no difference to the ride height, I suspect that either the torsion beam mountings are knackered or more likely the torsion bars need reindexing.

Expensive?

Fiddly as in no parts but labour. Also dependent on how much of it is seized up! It needs to go someone who has done it before. It'll need a full geometry check after as well.

David924S · **Posted:** Wed Dec 02, 2009 1:09 pm

Pastry wrote:

Brucey wrote:

I should point out it has 255 rear tyres on boxster wheels.

that'll most likely be the problem; bit fat for a 944, turbo has 245s iirc and rolled arches. my 2.5 n/a is on 225 rears on 8j rims.

standard for a 2.5 n/a was 7j rims all round on 215 or 195. but the rears sit under quite a bit with them.

mind you if its sitting unevenly then suspension isnt right either.

I have 255/45/17 on cup1 alloys on my 944S2 and they don't come close to touching the arches even with people in the back seats so I would suspect more a problem with the torsion bar and rear suspension, also as mentioned check the wheel offset is suitable for your car.

tr7v8 · **Posted:** Wed Dec 02, 2009 1:27 pm

Just a thought Brucey it hasn't got odd rear wheels or a spacer on one side has it?

Brucey · **Posted:** Wed Dec 02, 2009 4:35 pm

tr7v8 wrote:

Just a thought Brucey it hasn't got odd rear wheels or a spacer on one side has it?

I'll have a ganders later in work if I get a chance.
Thanks everyone for your help :wink:

Richy_S · **Posted:** Wed Dec 02, 2009 4:45 pm

tr7v8 wrote:

Brucey wrote:

stepa1007 wrote:

What is the offset?

You may as well be talking chinese to me now mate :lol:

I think the first thing to do is to replace the rear shocks as it's obvious that they're goosed. I can only just slide my finger under that arch and just about two under the other.
Is this gonna be mega bucks?

Off set of wheels will be marked on them as ETxx that is what Stephen is talking about.

Shocks will make no difference to the ride height, I suspect that either the torsion beam mountings are knackered or more likely the torsion bars need reindexing.

May get away with just adjusting the eccentrics.

Rich

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