944 tyre pressures
Discussion
Well, I picked up my shiney S2 on saturday, put a couple of new tyres on the back, went to check the pressures in the hand book and it says 36 and 44 psi front to rear respectively - do you guys stick to that as it seems very high to me?!
Also the front end of this car seems more than a little wandery, I'll be getting a couple of new front tyres as a matter of course and prolly a set of shocks but am hoping it's not ball joints!
Stupid question - how do you tell? And what's a guide line cost of replacement?!
ta,
Happy S2 Owner!
Also the front end of this car seems more than a little wandery, I'll be getting a couple of new front tyres as a matter of course and prolly a set of shocks but am hoping it's not ball joints!
Stupid question - how do you tell? And what's a guide line cost of replacement?!
ta,
Happy S2 Owner!
I think there was a year where the manual stated the pressures should be 36/44, but all the later ones specified 36/36 - which is what I have mine set to.congratulations on your purchase!
Porsche seemed to recommend different tyre pressures every year for some reason. My '88 Turbo S is supposed to run 36 psi all round, but I find it much better at 32 all round - far more grip and no signs of uneven wear so far (about 5000 miles).
As for the wandering at the front, check the antiroll bar bushes. Mine are fairly worn and I will be changing them soon. Hopefully this will also help to settle the car under heavy braking as it squirms a bit at the moment.
Also check the tracking.
Jack up the front of the car and wobble the wheels side to side and up and down - there should be hardly any play. If there is play it could be either the ball joints or wheel bearings. Also, if the ball joints are worn, you may get some clunking when driving.
Steve
Porsche seemed to recommend different tyre pressures every year for some reason. My '88 Turbo S is supposed to run 36 psi all round, but I find it much better at 32 all round - far more grip and no signs of uneven wear so far (about 5000 miles).
As for the wandering at the front, check the antiroll bar bushes. Mine are fairly worn and I will be changing them soon. Hopefully this will also help to settle the car under heavy braking as it squirms a bit at the moment.
Also check the tracking.
Jack up the front of the car and wobble the wheels side to side and up and down - there should be hardly any play. If there is play it could be either the ball joints or wheel bearings. Also, if the ball joints are worn, you may get some clunking when driving.
Steve
When I used to run mine (about 7 years ago!) on the standard S2 rims, I did 2 complete sets of rears, RE71 and a set of SO1’s, I ran both sets at 36 and when they were due for changing, you could see the middle ever so slightly more worn than the out-side edges (indicating over inflation). But it was sooo marginal, I don’t think you need to run them any lower, I certainly would run them higher, unless you constantly carry people in the back.
Front I used to run at 36 as well, but I always shagged them due to a couple of track days per year and trying to take MK’s roundabouts, about 10 mph more than your supposed to…!!
jj
Front I used to run at 36 as well, but I always shagged them due to a couple of track days per year and trying to take MK’s roundabouts, about 10 mph more than your supposed to…!!
jj
Welcome to the club, you've made the right decision. turbo's have all been owned by pis(ton)heads who trash them around tracks on race days. The S2 is for the more refined.
I see you are already started by asking the same questions we all ask. I've only had mine a short while and the regulars on this site are incredibly helpful.
Look out I f'd the sunroof the first time I took it off on replacing it. It's something you only do once anyway. Its too b noisy with it fully removed and not worth the hassle or is it a rag top? Show off and give us a few details. Enjoy, they are lovelly!
>> Edited by bob944 on Monday 26th April 19:04
I see you are already started by asking the same questions we all ask. I've only had mine a short while and the regulars on this site are incredibly helpful.
Look out I f'd the sunroof the first time I took it off on replacing it. It's something you only do once anyway. Its too b noisy with it fully removed and not worth the hassle or is it a rag top? Show off and give us a few details. Enjoy, they are lovelly!
>> Edited by bob944 on Monday 26th April 19:04
on my 968 i found this really depends on the type of tyre, when i had N-rated contisports, 36 felt too high
but on F1 gsd3 at least 36 is needed to avoid side wall flex and inprecision as its a pretty soft sidewall or compound, it is a bit harsher tho still better than the contis (f1's at 32 psi give limo ride) but when pressing on you will notice the difference
but on F1 gsd3 at least 36 is needed to avoid side wall flex and inprecision as its a pretty soft sidewall or compound, it is a bit harsher tho still better than the contis (f1's at 32 psi give limo ride) but when pressing on you will notice the difference
IIRC the higher presures, 44, listed in the handbook were generally considered to be for continued high speed running, e.g. autobans at near flat out speeds.
I wouldn't set above 36. For 17 inch 225 fronts and 255 rears, I've found 32/34 to be OK for all situations, (other than Euro autobans).
These are COLD settings, not warm.
For track use, 16 inch 245's all round (inc fronts), dry track, set at 28 cold, and keep at 36 HOT.
I wouldn't set above 36. For 17 inch 225 fronts and 255 rears, I've found 32/34 to be OK for all situations, (other than Euro autobans).
These are COLD settings, not warm.
For track use, 16 inch 245's all round (inc fronts), dry track, set at 28 cold, and keep at 36 HOT.
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