Tyre Pressures
Discussion
lowest said:
My Tuscan hand book clearly states 28 psi front and rear going up to 31 for sustained high speed, track days or fully laden. I've been using these values on the car since new with no problems or odd tyre wear.
Just to qualify that a little.... That's with 235/40 ZR18s on the front and 245/40 ZR18s on the rear.
tuscany said:
Ok thanks, i will give it a go but i have to say I'm not feeling confident about this.
It will either be "Good news" or "spares or repair !"
It will be(IMHO) correct at 22/24, just ensure you have an accurate guage dont rely on the local garages airhose and set the pressures when tyres are cold.
And if you have new rear tyres give it 200 or 300 miles for the tyre release agent to wear off and for the tyres to settle down before you go attacking corners.
Edited by whitey on Wednesday 21st March 15:19
TUSCANY said:
Ok - I have reduced the rears down to 26 psi and its dangerous !
I will try a little lower, but either the tyres are pants or faulty !
After that, I'm not sure what to do.
1. Make sure you're setting the tyre pressures from cold
2. Make sure you're using a decent, accurate tyre pressure gauge. I'd only go with a digital one nowadays (and some of those can be inaccurate, too)
3. I'd just about be able to tell if my rears were at 26 rather than 24, even in good conditions. And I wouldn't like it. 24 on the rears. *nods*
What's making it dangerous now? Handling generally comes from the front, not the rear. Incorrect (high) rear tyre pressures on a Tusc will probably lead to worse tramlining (especially on lane changes, etc)... if the tyre pressures are uneven between the wheels. (Know that one, cos I tried it for interests sake)
I'd have to agree with James about uneven pressures making things worse, even by a few PSI.
The biggest cause of worry I had was when my tyres were new!
This caused tramlining on a horrendous scale - so much so that I thought there must be something wrong with the suspension setup. This was checked and found to be ok.
Over the next 1500 miles or so the problem got less and less, and after about 3000 miles the handling was back to its previous best.
The tyres are Goodyear Eagle F1s BTW and I run 24psi all round.
The biggest cause of worry I had was when my tyres were new!
This caused tramlining on a horrendous scale - so much so that I thought there must be something wrong with the suspension setup. This was checked and found to be ok.
Over the next 1500 miles or so the problem got less and less, and after about 3000 miles the handling was back to its previous best.
The tyres are Goodyear Eagle F1s BTW and I run 24psi all round.
nelly1 said:
I'd have to agree with James about uneven pressures making things worse, even by a few PSI.
The biggest cause of worry I had was when my tyres were new!
This caused tramlining on a horrendous scale - so much so that I thought there must be something wrong with the suspension setup. This was checked and found to be ok.
Over the next 1500 miles or so the problem got less and less, and after about 3000 miles the handling was back to its previous best.
The tyres are Goodyear Eagle F1s BTW and I run 24psi all round.
The biggest cause of worry I had was when my tyres were new!
This caused tramlining on a horrendous scale - so much so that I thought there must be something wrong with the suspension setup. This was checked and found to be ok.
Over the next 1500 miles or so the problem got less and less, and after about 3000 miles the handling was back to its previous best.
The tyres are Goodyear Eagle F1s BTW and I run 24psi all round.
You've burned through a whole set of rubber on the old girl? The tyres were nearly new on it when you took the keys, bud!
Would agree, though - bad tyres can be SHOCKING. I had a pair of F1s on it and I think a pair of SO3s (nelly - you'll probably know better than me now
)... Depending on which set were on the front and which were on the back, it went from being fantastic with them matching the front/rear characteristics to frickin' frightening depending on which way round they were. (Different tyre wall firmness, etc) If it IS running SO3s all round... I'd definitely ditch them off one end! (Do a search on previous threads on here - put a LONG one up about tyres a couple of years back)
J_S_G said:
You've burned through a whole set of rubber on the old girl? The tyres were nearly new on it when you took the keys, bud!
Would agree, though - bad tyres can be SHOCKING. I had a pair of F1s on it and I think a pair of SO3s (nelly - you'll probably know better than me now
)...Well, not quite burned through them.....there was the small matter of the tiny 'off' I had!
It was SO3's at the back and Goodyears at the front, but now it's Goodyears all round - and all the better for it - particularly in the wet!
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