GT3RS TYRE PRESSURE ????

[sambaman]

What should i be running guys..just put the TOYO 888's on the car what would you suggest ?????

[fergus]

keith

buy a tyre pyrometer and experiment until you get the same heat reading across the tyre. Will also let you know if the car should be running more or less camber.... demon thieves flog them for about a ton. very useful bit of kit to have. Without this, you can't be sure your car has the optimum camber settings - no matter what Parr, JZM, etc say....

[DanH]

For 888s hot temps should be 35-36 on the front and 39ish on the rear. If you run them like MPSCs (32ish all round) you will destroy the inner shoulder prematurely.

For road use, I just run the Porsche recommended cold temps from under the fuel cap, but add an extra PSI or so to compensate for the additional camber in my setup.

[sambaman]

thanks guys...

[simply tyres]

DanH said:

For 888s hot temps should be 35-36 on the front and 39ish on the rear. If you run them like MPSCs (32ish all round) you will destroy the inner shoulder prematurely.

For road use, I just run the Porsche recommended cold temps from under the fuel cap, but add an extra PSI or so to compensate for the additional camber in my setup.

Totally agree,nice one dan,also agree completly about using a tyre temp guage,nothing else will tell you whats happening to the tyre.

[DanH]

simply tyres said:

also agree completly about using a tyre temp guage,nothing else will tell you whats happening to the tyre.

True, but it gets tedious very quickly. It's bad enough checking pressures all the time.

Now if you have a pit team, I can see the appeal...

[taffyracer]

fergus said:

keith

buy a tyre pyrometer and experiment until you get the same heat reading across the tyre. Will also let you know if the car should be running more or less camber.... demon thieves flog them for about a ton. very useful bit of kit to have. Without this, you can't be sure your car has the optimum camber settings - no matter what Parr, JZM, etc say....

They need to be staggered from inside to out not the same, if they're the same something is wrong!

[Agent Orange]

Sambaman is my pit team ...................... by how much pse inside to out ????

Edited by Agent Orange on Wednesday 28th February 09:10

[sambaman]

just making sure i got it right for you ORANGE BOY !!!

Agent Orange said:

Sambaman is my pit team ......................staggered by how much pse inside to out ????

[fergus]

taffyracer said:

fergus said:

keith

buy a tyre pyrometer and experiment until you get the same heat reading across the tyre. Will also let you know if the car should be running more or less camber.... demon thieves flog them for about a ton. very useful bit of kit to have. Without this, you can't be sure your car has the optimum camber settings - no matter what Parr, JZM, etc say....

They need to be staggered from inside to out not the same, if they're the same something is wrong!

I think you'll find that tyres are designed to run optimally parallel to the ground, with the load spread evenly over the tyre. Why would you want the inside/outside of a tyre to run hotter than the other side? You can normally tell under/over inflation from the middle vs the outside temps and an incorrect camber setup via inside versus outside temps. However, I agree, there will be a slight stagger from inside to outside edge.

[Agent Orange]

EVEN THOUGH U VE SAID IT 3 TIMES, THATS EXACTLY WHAT I VE BEEEN BROUGHT UP ON so very keen to learn abt the staggering theory PSE ?

[fergus]

vic, check out:
www.coleparmer.com/techinfo/techinfo.asp?htmlfile=Fluke-track.htm

www.turnfast.com/tech_practice/practice_tires.shtml (start of 3rd para...)

Edited by fergus on Wednesday 28th February 11:51

quote:

While most cars will utilize a similar tire pressure range, the difference of one psi will make a noticeable diffence in handling to even a moderately experienced driver. Two pounds can make a major difference in a car's overall grip level that even a novice can recognize. Therefore, asking what someone else uses for a tire pressure is completely irrelevent information (unless it's the exact same car setup). You must do the testing on your car to determine the optimum pressure setting for a given track and ambient conditions.

Edited by fergus on Wednesday 28th February 11:53

[Agent Orange]

Just back from a swifty ...............many tks will have read with care !So still cant see where the stagger comes in ?
Last time id di some of those things suggested measurings was witha set or MSPC and the aid of a Mr Hutchison , i neither use those tyres nor the same car or set up now so maybe wil spend a morning with the 888 s and current set checking it all out again
Tks for the articles

Edited by Agent Orange on Wednesday 28th February 15:10

[fergus]

Agent Orange said:

Just back from a swifty ...............many tks will have read with care !So still cant see where the stagger comes in ?
Last time id di some of those things suggested measurings was witha set or MSPC and the aid of a Mr Hutchison , i neither use those tyres nor the same car or set up now so maybe wil spend a morning with the 888 s and current set checking it all out again
Tks for the articles

Vic, there is no stagger, unless your camber is not correctly setup... cheers

[Agent Orange]

Fergus u have nt said it at least 3 times so u dont mean it ..............again have to say from my limited knowledge , stagger equals more heat on one edge ,equals uneven grip and one dodgy set up ..........

Edited by Agent Orange on Wednesday 28th February 18:04

[fergus]

Agent Orange said:

Fergus u haven't said it at least 3 times so u dont mean it ..............again have to say from my limited knowledge, stagger equals more heat on one edge, equals uneven grip an done dodgy set up ..........

Areed. I never said you needed any 'stagger'.... I was merely correcting another post...

[964RS]

So in stupid world then....if the inside of a tyre was hotter than the outer would you reduce pressure or increase? And would you do the opposite if the other way around?

I'm guessing in all cases you actually start high and reduce down until you get a level temp? Which is what normally happens.

Is a level temp then the best indicator of best grip possible?

If so then this has to be worthwhile as I do find myself reducing presuure until I 'feel' like I have reached optimum all round grip but its pretty much guess work until you get there.....

[Agent Orange]

FWIW i think ur right..........aim foreven spread , but still rest with set up in first place

[993rsr]

I think it's also important to remember that most folks are only using tyre pressures as a guide during trackdays, not qualifying at Le Mans.

Edited by 993rsr on Wednesday 28th February 18:29

[simply tyres]

DanH said:

simply tyres said:

also agree completly about using a tyre temp guage,nothing else will tell you whats happening to the tyre.

True, but it gets tedious very quickly. It's bad enough checking pressures all the time.

Now if you have a pit team, I can see the appeal...

You can Dan....I am very cheap...