R888 Tyre Pressures for Drag Racing

I'm just wondering what sort of tyre pressure I should be running in my rear 285/30/18 R888's for going up the strip on Saturday?

I usually run 32psi on the road, is it worth me lowering it at all when I get there to aid off the line traction?

i all was drop it to 25 rear 38 front, not sure if it helps or not it does in my mind lol.

15psi roughly....edit: just to clarify this is what we used on the 15" drag wheels with 28" tyres

wow down to 15psi thats lower then i thought , next time i will drop mine some more

Not R888s of course, but this is the guide I have been using for my MTs:

http://www.mickeythompsontires.com/tech.php?bulletin=s3

I would run them at the correct pressures for road driving. R888s are no good for drag racing anyway. They're designed for circuit driving.

I'm aware they're not drag tyres by any stretch of the imagination but they do help put the power down in the first couple of gears

Going off the above advice I'll give it a try at the normal pressures then maybe try lowering them for the next runs. I'll take a foot pump with me to make sure I can re-inflate lol.

Is that 32 hot or cold ?

Is that 32 hot or cold ?

I always inflate them cold as a rule. I never seem to see more than a psi difference when they're hot though? (only checked using petrol stations tyre inflater).

I would be very very wary of lowering the tyre pressures that much on a stiff side walled low profile road legal track tyre. You could damage the side wall construction, plus it might be all but impossible to control if it gets very sideways.

I would be very very wary of lowering the tyre pressures that much on a stiff side walled low profile road legal track tyre. You could damage the side wall construction, plus it might be all but impossible to control if it gets very sideways.

I'm going to leave them at the pressure they're at now then. I don't want to completely ruin them just yet and it will save my leg having to pump them back up

As Chris says, don't lower the tyre pressure on a low profile road (radial) tyre

The side wall is too stiff and you will risk damaging it and it won't help traction

It could actually make it worse as the tyre may deform in the middle giving you less contact area.

You can get away with it on drag radials as the side wall is so large and has some give in it.

I'm running 32-33psi on Track when hot. Starting at 26-27 cold approximately. For Drag racing you'll be having problems getting them constantly hot and they do lose a lot of pressure when cooling down at least when comparing hot to cold Pressure

I'd try to inflate them to 29psi at the rear and a lot more on the fronts cold. After the burnout(if you are doing one) it should be okay

could this not cause damage to the diff also??

Well I ended up running them at 32 psi cold but could not get any heat into them at all and I wasn't getting much traction. Maybe I should of done a longer burnout?

The answer I think is to buy myself some stock 16"s and fit some proper drag radials for my trips to Santapod.

If you run say 25psi and do a burnout then the pressure will prob be back up to 32-35 for the run, if no burnout then normal pressure, my 17" drag radials we ran below 20 psi for all the 10 sec runs