Proxes 1 tyre pressures

[simont]

Just fitted some Toyos to the rear of the Griff. It now handles very differently. I am running 20 PSI on the front S02s annd 24 PSI in the rear Toyos. Anybody else got the same combination? Happy or sad? what pressures are you runing?

Simon

[d1bble]

26 all round....

[GarryM]

22 front 24 rear all SO2s

[GreenV8S]

quote:
It now handles very differently.

Differently how? BTW it's bound to take a while for the Toyos to cure and scrub in and in the meantime they're probably going to make it a bit tail happy.

[simont]

Sounds about right although Its more a feeling that on turn in the car oversteers then corrects itself with no input from the steering, may be they need more time (200 miles so far) or maybe more PSI?

[heliox]

the tyre wall thickness is different on them im led to believe, probably why they react differently.

heliox

[apache]

20psi at the front is a bit low, I run mine 23/25 and it seems a good comprimise......does the problem ease as they heat up?

[gerjo]

after extensive testing, I run them at 28 front, 30 rear

however, this is with 16" front and 17" rear wheels

coincidently, these are also the figures the Toyo distributor calculated for the Griff with the above mentioned wheels

[griff2be]

But Apache - you've got 17" wheels, which makes a difference....

[shpub]

quote:
Sounds about right although Its more a feeling that on turn in the car oversteers then corrects itself with no input from the steering, may be they need more time (200 miles so far) or maybe more PSI?

It is the softer tyre wall that they have so the tyre starts to roll off the rim and then comes back. I would chcek the sidewall lettering for wear immediately
The cure is to increase the tyre pressure or (fit them onto wider wheels ) and then the contact patch starts to reduce which makes the car even happier.

Personally I prefer sidewalls that stay where they should be as you can get a far better feel of what the car is doing. Any movement is due to the car and not the tyre squidging.

Steve
www.tvrbooks.co.uk

[simont]

Lettering gone and slight scuffing on the outer edge of the rim, could this be the problem....

[heliox]

the tyres are the problem, the tyre wall errosion is the symptom.

fitting these Toyos is a step backwards if you ask me, SO3's are the way to go, IMHO of course.

heliox

[sb930turbo]

I have to say I think that different makes of tyre are a 'no,no' on a high performance car.This could well be the cause of your hndling problem.

[mikial]

I`ve the same combination.Done over 1000 miles now.At first the feeling was the rear trying to overtake the front ,tried various pressures , went as high as 32 in the rear, all to no avail.
Last week took off all wheels to clean chassis, the weight difference between 225 SO 2 (F) and 245 Toyo (R) was immediatley noticeable with the SO 2 so much heavier.
The input on steering needed to go in a straight line over certain speeds is much more than the previous set up ( SO 2 all round.)

Think I`ll go to F 1 `s.

[shpub]

quote:
Think I`ll go to F 1 `s.

Seen similar problems's with these tyres as well. Soft sidewalls. What is this reluctance to go with S03s?

All of the S03 problems are reported when bigger wheels and even lower profile tyres are fitted.

Steve

[shpub]

quote:
Lettering gone and slight scuffing on the outer edge of the rim, could this be the problem....

Been there, done that, bought the new underwear. First encountered this on the 520 when it was a 390. Got some scary pictures of the tyre moving right off the rim.

Steve

[mikial]

Personal choice after the "Evo" tyre test. Toyo came out favourably against the SO3 which didn`t do well,plus the fact they`re factory fitted on the Tuscan.
The car (95 5 Griff with 2000 chasis & suspension) just doesn`t feel "planted" any more, squirms about when o/taking under heavy acceleration.

I think the car is compromised now and the only way to go is SO 3 .

The Overfinch is much more fun right now (88 Classic Rangie with a 5.7 Chevrolet engine)so not too concerned.


>> Edited by mikial on Saturday 14th September 08:17

[simpo one]

'Last week took off all wheels to clean chassis, the weight difference between 225 SO 2 (F) and 245 Toyo (R) was immediatley noticeable with the SO 2 so much heavier.'

Could it also have be that the rear wheels are 1" bigger than the fronts? (If you have same size wheels front and back I withdraw this suggestion!)

[mikial]

I expected the rears to be heavier than the fronts.
15 inch front 16 inch rear.