What psi? - That is the question

CT · Postby CT » Sat Jan 21, 2006 1:07 pm

smiles wrote:CT that's some great info, any chance we can have it as a sticky?

Is the 4 psi range sufficient to take into account the weight of the car. I believe a heavier car would need to have higher pressures than a lighter one.

Again, it's a reliable guide from a tyre manufacturer when testing performance tyres. Ted as always is spot on too. A good eg is my XR8 wears 18s but I run 40psi in the rear and 38 in the fronts - especially when towing. The MX5 is probably happiest at the softer end of the scales but I can change my car's high speed handling by adding 2psi front or rear so it's a fine tuning tool as well.

MxJadeMonkey · Postby **MxJadeMonkey** » Sat Jan 28, 2006 10:44 pm

cold running 35 to 36 psi no higher as car becomes way to skitttish, i running 205/45 17x7 khumo supraz

THE REAL BORIS · Postby **THE REAL BORIS** » Tue Jan 31, 2006 10:59 pm

Mazda Australia Track Day Queensland Raceway 2005. Insisted that ALL the Mazdas MX-5 / SE/ RX8, 6 etc. had 36 psi cold all round.

Crazy?! but then again, they didn't see the road rule "drive on the left" as being in the top 5 safety requirements either!

Stay with the manufacturer's balance front/rear I say and add 4, 6 or 8psi depending on how much you want to scare yourself .............

Or, ...................... drive on the right?

Brad · Postby **Brad** » Tue Jan 31, 2006 11:55 pm

I run 32 with the Azenis for the road, and 27 for the track, to give a hot temp of around 34-35. Sure you can pump more in them to make it feel like it's turning in better, but that's only because there is less rubber on the ground giving less friction, but at the same time less grip.

4sfed5 · Postby **4sfed5** » Fri Feb 10, 2006 4:16 pm

Regarding the electronic air gauges....
They are made by clipsal in australia and are very very accurate... i know because i service them...
the pressure sensor element is calibrated and is self testing.it is also VERY temperature stable having only around 1/2psi difference at 100psi between -10 degrees and 60 degrees. so when it thinks that the sensor is faulty due to having a slightly different millivolt value at atmospheric pressure it will throw an error code.
you need to make sure that the tyre chuck on the end of the hose that clips to the valve isnt leaking..
Leaking valve connectors is 99% of the "faults" we get with them......
i trust them more than any repco tyre gauge thats for sure!