What pressure should I use using MT ET Streets 305/35R18

[Dan Wendling]

What pressure should I use using MT ET Streets 305/35R18 at the strip (and on the road to and from the strip)?

3.42 rear, headers, 2600 Stall TC, and CAI are the only performance mods. Plus trying to figure out the A6 tuning.

[iburke]

The pressure to and from the track should be the normal pressure recommended by the manufacturer.

Pressure for the track is a trial and error procedure for your car. Try different pressure until your find your sweet spot for launching... I wish I could tell you there was a book to look in but there is not.

Keep good records every time you run, Temp, pressure, 60' times launch RPM etc etc ect...

[livnup]

Originally Posted by Dan Wendling

What pressure should I use using MT ET Streets 305/35R18 at the strip (and on the road to and from the strip)?

3.42 rear, headers, 2600 Stall TC, and CAI are the only performance mods. Plus trying to figure out the A6 tuning.

You can start at 22 psi and see how it hooks, then could go down to anyway from 22psi to 18psi, remember when measures at a hot temp., it will also increase after each burnout, so for a 20psi inflation, it will read about 22psi after burnout, now after racing, you can put about 26/29psi for driving to and from the race track. Be safe and enjoy yourself.

[stkjock]

I've found 17 psi to work well on my ET SR IIs at the track.

(265/40/18)

Regular driving I keep them at 30psi unless I go looking for trouble... then I take them down to 25 or so for the street

[TBYRNE]

I've had good luck with 16-18psi at the track.

[racingvette]

You need to talk to the tire maker and see what the lowest PSI is without the bead of tire spinning on the rim.

Else you might use lower PSI but degrade the bead over time and also cause tire to leak air or break loose from rim.
GY for stock tires says no less then 25 PSI

I'd suggest testing launches between 20-25 PSI (cold) to be safe and besides the less tire spin the more load is being put onto wheel bearing and drivetrain so better tires break loose a but rather then parts breaking.

The less PSI the faster air would heat up and expand so I'd suggest using nitrogen.

[frans96ss]

Originally Posted by livnup

You can start at 22 psi and see how it hooks, then could go down to anyway from 22psi to 18psi, remember when measures at a hot temp., it will also increase after each burnout, so for a 20psi inflation, it will read about 22psi after burnout, now after racing, you can put about 26/29psi for driving to and from the race track. Be safe and enjoy yourself.

Agreed.