Dnk Posted June 18, 2015 Share Posted June 18, 2015 I forgot to say that was a cold setting which will rise as the air inside heats up Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 18, 2015 Share Posted June 18, 2015 If I am initially setting up a road car I go in 5 PSI "jumps", you'd have to be very attuned to a particular car to notice a 2 PSI change But really, without proper temp probing you may end up with a pressure setting that makes the car feel good, but get centre of tread wear as you are using more pressure than is optimal for even wear to counteract understeer or oversteer, or just stabilise the sidewalls as road car tyres are softly walled for NVH. "Pushing on" on a B road is totally different to pushing on for consecutive laps on a track. On track the required 2.5 plus front degrees negative camber will give even tyre wear and good turn in. On the road it will crucify the inner tyre edges in a few thousand miles or less. It's all a huge compromise unless the car is for a sole purpose. On track the front lower wishbone inner bushes are ludicrously squidgy and the geo will wander about in corners and under hard braking. Spherical bearings will cure that, but make it horribly harsh and noisy on the road.... Quote Link to comment Share on other sites More sharing options...
Jellybean Posted June 18, 2015 Author Share Posted June 18, 2015 Great information Chris , I may start at a lower psi 28 rear , 32 front to see how is is and keep an eye on tyre wear Thanks for the Help! Quote Link to comment Share on other sites More sharing options...
Wez Posted June 18, 2015 Share Posted June 18, 2015 Those pressures look too low, I think I use to run 36 up front and 34 in the rear. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 18, 2015 Share Posted June 18, 2015 28 is as low as you probably want to try in the front, you don't want to roll the tyre off the rim! I usually find big heavy road sports saloons / sports GT cars end up with circa 38 PSI hot all round. But there's always the exception. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted June 18, 2015 Author Share Posted June 18, 2015 Toyota do say 36 all round , ok , let's try 36 front and 30 rear I am not even going to get into how volatile air is versus nitrogen lol Quote Link to comment Share on other sites More sharing options...
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