Is this dangerous????

[Bonnie and Clyde]

Well after a great weekend racing Col bought me a portable Michelin tyre pressure gauge as a treat
However i questioned it accuracy when i found that one of the front tyres on the VXR8 was reading 51 psi and all others were around 45-47 psi
Surely at speed thats dangerous????
I have now adjusted them to 38 rear and 36 front as suggested on the inside doors.

What do you all think please???
BTW the last person to put pressure in was a tyre specialist I had no reason to believe they wouldn't be correct.

I feel a touch uneasy about this

[after_shock]

Depends on the tyres, they have ratings on the sides, all mine say do not exceed 50psi but if going round a track or building a lot of temp in the pressures would increase so starting at 50psi would be a bad idea!!

[drew ss]

what was in them before u raced at TR

[Glyn84]

Bonnie and Clyde said:

BTW the last person to put pressure in was a tyre specialist I had no reason to believe they wouldn't be correct.

Sadly anyone can call themselves a specialist when really they aren't. I've had new tyres fitted by specialists with anything from a few PSI over, a few PSI under, and even 10 PSI under. You did the right thing in correcting them yourself which is always the best thing to do. Even if you have no reason to believe they are wrong I always still check so I know for sure. If nothing else it puts my mind at ease.

[Bonnie and Clyde]

drew ss said:

what was in them before u raced at TR

I didn't check them before i ran. Should have i know but i didn't. So i have been at top speed with 51psi in my front tyre.

[crisisjez]

No not dangerous Mel.
The tyre is speed rated to 186mph or better AT a max of 50(ish)psi(Build in the manufacturers margin for safety on that figure too) so 158 was a walk in the park.
Not a good idea for prolonged tyre life though

Also not your top speed, just your mile speed....but I have a plan for the next TR

Edited by crisisjez on Tuesday 30th March 20:41

[nosubstitute]

Not wishing to sound like a complete @rse but checking tyre pressures before a trackday/drag day is the first thing I do before venturing out on track. The reason being that I have always been under the impression that for track use you need to increase the pressures.

I never rely on a tyre place to correctly inflate the tyres because to date none have done it properly.

[ARAF]

Frankly, the extra pressure would have hampered 1/4 mile times, but helped you with terminal speed.

As Jez says, there's plenty of safety margin built it, but don't make a habit of using it. ;o)

[stevieturbo]

What is a tyre specialist ? You mean a tyre fitter ?

They just pump them up til the bead seals, and most leave at that. And if its 50psi cold....you can be sure its a lot higher when warm !!

[SimonV8ster]

I had a couple of rear tyres fitted by a local spaz specialist and when I got the car out of the garage the next day they were both pretty much flat.

Pumped them up and went back and neither of the valves had been tightened up.

[royal family]Specialists my arse.[/royal family]

Edited by SimonV8ster on Tuesday 30th March 21:19

[Bonnie and Clyde]

ARAF said:

Frankly, the extra pressure would have hampered 1/4 mile times, but helped you with terminal speed.

As Jez says, there's plenty of safety margin built it, but don't make a habit of using it. ;o)

Really WOW i did a 13.1 1/4 mile so maybe i could be doing sub 13's on the right pressure??????????????????/

And as for making a habit of it, dont worry i'll never do it again

Edited by Bonnie and Clyde on Tuesday 30th March 21:28

[ARAF]

Thinking about it, have you checked them with a different gauge? It could be that the one you have is faulty.

[Bonnie and Clyde]

stevieturbo said:

What is a tyre specialist ? You mean a tyre fitter ?

They just pump them up til the bead seals, and most leave at that. And if its 50psi cold....you can be sure its a lot higher when warm !!

A tyre fitter sorry. He has his own business in tyres and alloys. He also knows we take the cars on drag races. I will be making a very serious phone call to him in the morning.

[Bonnie and Clyde]

ARAF said:

Thinking about it, have you checked them with a different gauge? It could be that the one you have is faulty.

I checked it on the portable unit col bought me and then i went straight to a fuel station. Both reading were identical.

[Wolfracer]

Bonnie and Clyde said:

ARAF said:

Frankly, the extra pressure would have hampered 1/4 mile times, but helped you with terminal speed.

As Jez says, there's plenty of safety margin built it, but don't make a habit of using it. ;o)

Really WOW i did a 13.1 1/4 mile so maybe i could be doing sub 13's on the right pressure??????????????????/

And as for making a habit of it, dont worry i'll never do it again

Edited by Bonnie and Clyde on Tuesday 30th March 21:28

WOW! Zero rolling resistance! No wonder you flew by us all. Your'e lucky you didn't float away at those pressures!

[stigmundfreud]

so it was the 300000psi of tyre pressure that done it!

Jez (mel this aint a pop at you so dont worry, btw the video is uploaded now), at the next one it might be worth getting scrutineering to check tyre pressures

[Boosted LS1]

Maybe you had one fast wheel and the other 3 were just keeping up

Also is a fuel station an americanism for the garage?

Edited by Boosted LS1 on Tuesday 30th March 22:14

[Wolfracer]

Boosted LS1 said:

Maybe you had one fast wheel and the other 3 were just keeping up

One wheel felt pressurised into going fast, however the other 3 were a little deflated by the whole experience!

[ARAF]

No wonder Mel was using the right hand side, when Col told her there was a nasty bump. She was using it to take off, and bounce to the end.

[Bonnie and Clyde]

Boosted LS1 said:

Maybe you had one fast wheel and the other 3 were just keeping up

Also is a fuel station an americanism for the garage?

Edited by Boosted LS1 on Tuesday 30th March 22:14

No thats a Gas station