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Porsche specialists buying, selling, servicing | 911virgin | Uxbridge

996 C4 Tyre wear

O

Ocean996C4

Silverstone
Joined
14 Jul 2016
Messages
134
Good afternoon, I'm a long term 996 owner having had several, normally in 4wd flavour, but I've not had the issue that I'm having with tyres on my current car before.

It's a 1999 C4 without a LSD, it's on coilovers, new coffin arms all round, had a four wheel alignment done before fitting a new set of Pirelli P zero tyres all round.

1800 miles later and both rear tyres are goosed, road driving only, no track days and not what I'd call particularly spirited driving.

I've been running 34psi front and 40psi rear which is a bit lower than standard, the tyres have worn fairly consistently across the width of the tyre.

Any thoughts on a possible cause for the accelerated wear?

Thanks is advance
 
Far from being an expert and I've never tried P Zero's but it could be that the coilovers are set up to be too stiff (reduce the compression damping), spring rates are wrong, or the Geo is wrong - could the toe setting be out increasing the wear (although you stated even wear).

Are you carrying an elephant on the spoiler or wheel spinning away from every junction? I got 14,000m out of my Conti SC2's running standard pressures with mainly solo driving but can't imagine that 4psi less in the rears would make that much difference.

Good luck and please post your findings.
 
The geometry is spot on, done on a hunter by a guy who knows his stuff, no rear spoiler, and no wheel spin.

The only real unknown is the suspension, the damping is set in the middle of the range, and it's on the standard springs supplied in the kit, BC Coilovers by the way so certainly not the most expensive option, but the rear does not feel like it's doing anything strange.
 
Tyre pressure would give you uneven wear .

Incorrect geo would again give you uneven wear.

Poor damping or skipping would give you uneven wear.

1800 miles is pretty dam low , could you do a picture of the tyres and post it please , need to see if there is anything that sticks out as a possible reason for this.
 
Non expert hat firmly on! but I think it may be the coilovers,
The reason I say that is that when I changed my suspension to M030 an authoritive source told me that much of the less expensive coilovers were not designed with a rear engined Porsche in mind and therefore spring rates/damping etc may not be suitable and can be well out. On cheaper coilovers the adjustment is not linear so being in the middle of the adjustment could be near the high/low end of the actual scale.

I'm not sure about BC coilovers but maybe you should check with them and compare spring rates etc with higher end 996 coilovers to see if they are in the same ball park. For me it would take an informed guess and trial and error to hone the setup so I'd be inclined to take it to specialist to dial it in correctly.

BUT before any of that I'd wait for some other replies as I could be barking up the wrong tree!
 
The center part of the tread is wearing out faster than the outer parts .

Im not an expert on non Porsche items but tyre pressure would have an effect like this ..Left tyre shows signs of slipping or sideways wear as well .. not much but its still there .

EDIT ..

Actually that might be the shock damping on the left side and its skipping or bounceing the load and causeing that high / low effect in the center .
 
Whats the date code on the tyres? Is there any chance the tyres could be old stock and out of condition?
 
Thanks for the ideas, tyres are 2016 manufacture date.

I've taken it out for a spin today, and concentrated on trying to work out what the rear suspension is doing, on bumpy roads the rear wheels seem to be banging around a bit, like the suspension isn't damping well and the wheels are leaving the ground then re-connecting.

Not sure if there is enough adjustment to stop this happening, but I'll have a play with the settings tomorrow, I've a suspicion I might just need to buy better suspension though.
 
1800 miles :eek:

I've just checked my notes regarding my Gen2 996C4 and after having a full set of pzeros on mine the rears still had 3mm left after 8k miles and the fronts had 5.5mm.

The GEO was done soon after and I ran my car at 36/44.

My car was tracked several times at Brands Hatch and driven more on twisty B roads than motorways.

It definitely sounds like non-standard suspension that has caused your issue.
 
I can post a picture of the hunter print out before and after, however the settings were all in the green, why?
 
Ocean996C4 said:
I can post a picture of the hunter print out before and after, however the settings were all in the green, why?
Click to expand...

Ignore them being in the green, half the hunter defaults are wrong and it's not uncommon for someone to pick a totally different 996 to the one you actually have.... or a Carrera GT.

It's possible you have too much rear toe in coupled with a rear suspension that has limited droop compared to standard (this is what you feel as skipping over bumps) and is probably over soft on either spring or damper leading to the rear compressing more than it would as standard. As such the rear doesn't reduce toe in as it rises and increases toe in above standard when in compresses. How much lower than standard is it and do you have adjustable rear toe arms or is it still on the eccentric adjusters in the subframe?

I put a lot of work into getting a decent amount of droop into the suspension on mine and getting the spring rates right, I get 10 - 12K miles from a set of rear PS2s and that's on a car which is used in anger very often.
 
I am no expert on suspension but as a layman would have looked at manufacture date - 2016 so all good there and tyre pressures which with central wear would say too high tyre pressures. Maybe the tyres have been stored badly and sat in the sun and therefore hardened.

Best of luck anyway and I am looking forward to seeing the solution

Pip
 
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