mikey k

Spill the beans!!
Whats this "device"

Amuse Boy

You obviously aren't driving the car right. I start a drive with 32 all round and finish with around 34.5 / 35 psi all round.

I use the digital tyre pressure gauge from Halfords - IIRC it has an error margin of +- 0.5 psi

Different pressures between left and right tyres make a big difference - braking can make the car squirm and spirited cornering can be a little entertaining. IMO

Neil.H

Don't lie, everyone knows your car never moves

That was off the top of my head, I guess I remembered wrong. I use the Halfords gauge as well, I agree that different pressures could throw the handling off but I think 1 psi is too small a difference to notice. /shrugs

Amuse Boy

1psi between wheels is definitely noticeable - try a brake test - 100 down to 10 mph and you'll notice the car squirm with uneven pressures.

Kobe

the point is to be consistent....use the same gauge and measure at equivalent temps. If you can read the gauge to 1psi..then it should be able to done on all tyres with good accuracy..as long as you don't leak too much air whilst doing it.

I use compressor and then bleed the air to the point I want...use a gauge that holds the max pressure so easier to read away from the tyre.

I always notice the difference after taking the car to the dealer for a service..since they invariably play with the pressures.

The absolute number is not so important...it is what you are used to and you adapt your driving to that, it's the differences that cause the problem.

honpar

I think theres a few more variables to take into consideration here, can't all be put down to 1 psi differance across the axle, road surface, heaviness of braking, transfer of weight all come into play. Go to a tyre fitters and ask if they have a recently calibrated pressure gauge and compare yours against it, at least that way you will know how much adjustment is needed when checking pressures.

mikey k

kobe is spot on - be consistent!
PS I use the 0.5 psi step helfords gauge as well!

Karl2k

Any comments on the Nitrogen option in tyres?

Filling the tyres with nitrogen (I.e. pure air) is supposed to give better consistency. Basically (as I was told whilst have a 4 wheel geometry setting session done on Saturday) it is the water molecules in air that expand / contract when tyre temperatures rises/falls. Without the water molecules, there are no changes in tyre pressure...

Anyone gone for this? garage I was at on Saturday