Rich.2211 Posted October 18, 2013 Share Posted October 18, 2013 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? Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 18, 2013 Share Posted October 18, 2013 i all was drop it to 25 rear 38 front, not sure if it helps or not it does in my mind lol. Quote Link to comment Share on other sites More sharing options...
Jamesy Posted October 18, 2013 Share Posted October 18, 2013 (edited) 15psi roughly....edit: just to clarify this is what we used on the 15" drag wheels with 28" tyres Edited October 19, 2013 by Jamesy (see edit history) Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 18, 2013 Share Posted October 18, 2013 wow down to 15psi thats lower then i thought , next time i will drop mine some more Quote Link to comment Share on other sites More sharing options...
Shane Posted October 18, 2013 Share Posted October 18, 2013 Not R888s of course, but this is the guide I have been using for my MTs: http://www.mickeythompsontires.com/tech.php?bulletin=s3 Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted October 18, 2013 Share Posted October 18, 2013 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. Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 18, 2013 Author Share Posted October 18, 2013 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. Quote Link to comment Share on other sites More sharing options...
wile e coyote Posted October 18, 2013 Share Posted October 18, 2013 Is that 32 hot or cold ? Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 18, 2013 Author Share Posted October 18, 2013 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). Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 18, 2013 Share Posted October 18, 2013 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. Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 18, 2013 Author Share Posted October 18, 2013 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 Quote Link to comment Share on other sites More sharing options...
Lee P Posted October 19, 2013 Share Posted October 19, 2013 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. Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted October 19, 2013 Share Posted October 19, 2013 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 Quote Link to comment Share on other sites More sharing options...
LOGIE Posted October 19, 2013 Share Posted October 19, 2013 could this not cause damage to the diff also?? Quote Link to comment Share on other sites More sharing options...
Rich.2211 Posted October 19, 2013 Author Share Posted October 19, 2013 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. Quote Link to comment Share on other sites More sharing options...
dude Posted October 20, 2013 Share Posted October 20, 2013 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 Quote Link to comment Share on other sites More sharing options...
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