tyre pression and tyre damage
Discussion
I am booked next week for new front tyres and the old ones have done only a couple of miles. One of the front tyres has a dent (to the inside) in the inner sidewall. According to the tyreshop the damage was caused due to driving with (too) low pression. Recommended tyrepressures from tvr a quite low, i think. Also the tyres are worn more on the innersides. I had Falken 452's and ordered Good Year F1's now. Are the more Cerbera owners with 18"rims that suffered from tyredamage due to a too low pressure, although the tvr recommendation was followed? Tyreshop sais I should put in 2.5 bar. That would be 36,3 psi (used a calculator on the web).
What calculator is it that they used?
I find any more than 22 front 24 rear on the road starts to make it darty and prone to tramlining.
Inside edge wear can be caused by no end of things, tracking, camber, work steering rack or joints.
Sidewall damage can also occur on tyres at high pressure, very much depends on what you hit.
I find any more than 22 front 24 rear on the road starts to make it darty and prone to tramlining.
Inside edge wear can be caused by no end of things, tracking, camber, work steering rack or joints.
Sidewall damage can also occur on tyres at high pressure, very much depends on what you hit.
He didn't use a calculator. It was his general opnion. I also went with the 22 and 24 psi in the past. Reartyres are ok. Only the front left tyre has the damage. Both of the front tyres have more wear on the inside. The car is booked for Good Year F1's and frontwheel alignment. It has quite some camber wich looks nice, but i would be hapier when the tyres use less camber.
Having recently had my car setup by Centre of Gravity, having been on 24psi, i'm on a completely different setup now. It's all based on the suspension setup, temperatures of tyres, across the tyre, tyre manufacturer etc. It's about ensuring the wear is even and the tyre temperature is even across the width. I'm 24 on the front and about 28 on the rear now. This is for my car, my setup etc, but shows, that although 24 seems to be the defacto standard, each car is different.
If you want to set the correct pressure for your car use an IR thermometer. Drive the car it for a bit, a mile or two on a road that isn't biased to predominantly with either left hand or right hand bends. Stop amn measure the temperature of the tyre in 3 places - one on each shoulder of the tread and one in the middle. If the middle is hotter than the edges of the tread, then let air out, if the middle is cooler then put air in. Repeat until you get even temperature across the width of the tread and you will have perfectly inflated tyres at their operating temperature. On mine its 24 front and 25 rear.
Edited by Tanguero on Sunday 18th August 22:54
The GY eagles aere on, but i saw the inside of the the Falken tyres. One tyre had a handful of rubberpowder in it. The innersidewal had a lot of damage and the other side had started to. According to the tyreshop it was the combination of a very low tyrepression (the recommended tyrepression war considered very very low)and a lot of camber in the front wheels. It had too much camber. Wheels are now aligned and the frontwheels now have the maximum of camber that is allowed from tvr. They could not adjust it further than that.
Tanguero said:
If you want to set the correct pressure for your car use an IR thermometer. Drive the car it for a bit, a mile or two on a road that isn't biased to predominantly with either left hand or right hand bends. Stop amn measure the temperature of the tyre in 3 places - one on each shoulder of the tread and one in the middle. If the middle is hotter than the edges of the tread, then let air out, if the middle is cooler then put air in. Repeat until you get even temperature across the width of the tread and you will have perfectly inflated tyres at their operating temperature. On mine its 24 front and 25 rear.
A good start but if you want to do it properly then get a proper tyre probe pyrometer which measures the temperature deeper in the rubber closer to the carcass rather than merely the surface temperature of the tyre rubber. :racing geek mode off: Edited by Tanguero on Sunday 18th August 22:54
Keithyboy said:
Tanguero said:
If you want to set the correct pressure for your car use an IR thermometer. Drive the car it for a bit, a mile or two on a road that isn't biased to predominantly with either left hand or right hand bends. Stop amn measure the temperature of the tyre in 3 places - one on each shoulder of the tread and one in the middle. If the middle is hotter than the edges of the tread, then let air out, if the middle is cooler then put air in. Repeat until you get even temperature across the width of the tread and you will have perfectly inflated tyres at their operating temperature. On mine its 24 front and 25 rear.
A good start but if you want to do it properly then get a proper tyre probe pyrometer which measures the temperature deeper in the rubber closer to the carcass rather than merely the surface temperature of the tyre rubber. :racing geek mode off: Edited by Tanguero on Sunday 18th August 22:54
Tanguero said:
Keithyboy said:
Tanguero said:
If you want to set the correct pressure for your car use an IR thermometer. Drive the car it for a bit, a mile or two on a road that isn't biased to predominantly with either left hand or right hand bends. Stop amn measure the temperature of the tyre in 3 places - one on each shoulder of the tread and one in the middle. If the middle is hotter than the edges of the tread, then let air out, if the middle is cooler then put air in. Repeat until you get even temperature across the width of the tread and you will have perfectly inflated tyres at their operating temperature. On mine its 24 front and 25 rear.
A good start but if you want to do it properly then get a proper tyre probe pyrometer which measures the temperature deeper in the rubber closer to the carcass rather than merely the surface temperature of the tyre rubber. :racing geek mode off: Edited by Tanguero on Sunday 18th August 22:54
Mr Cerbera said:
225/35 x 18 26 psi, normal : 28 psi extended fast/load
255/35 x 18 27.5 psi, normal : 30 psi extended fast/load
Quickest, most reliable turn-in, superbly controllable powerslide exit I've ever experienced.
That's nearly what I run. 255/35 x 18 27.5 psi, normal : 30 psi extended fast/load
Quickest, most reliable turn-in, superbly controllable powerslide exit I've ever experienced.
I run 29 front, 28 rear, any less and the car over/understeers.Sagaris runs 28 all round and its lighter than ours!
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