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315 Sumitomo PSI

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Old May 5, 2008 | 01:18 AM
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Default 315 Sumitomo PSI

I'm going to the track this Saturday with the new tires (315 Sumitomos on a 17" rim). Granted they're DD tires, but I was hoping for some sub 2.0 60' times this time around, haha. Hoping for 12's!

What air pressure should I start at?
Also, about where on the tach should I launch at?

Car weighs about 3450 with me. Mods in sig. Thanks in advance
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Old May 5, 2008 | 01:21 AM
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Good luck getting below 2.0 with them, they are not all that sticky. I would start at 25psi and go from there.
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Old May 5, 2008 | 01:42 AM
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I set my 275/35/18's at 21psi and can get 1.8-1.9 60's
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Old May 5, 2008 | 03:19 PM
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Originally Posted by LT1-DAN
Good luck getting below 2.0 with them, they are not all that sticky. I would start at 25psi and go from there.
I was the first run of the night at our local drag strip after they just sprayed VHT down. with my 383, 3500-4000 stall, full weight car I cut a 1.95 60'. The tires were at 30-32 psi. light burnout to get the rocks and other garbage off the tires.

however, after that first one, I couldn't dip below a 2.0. most were 2.1-2.2.

I was running 315 sumitomos on 17" TT2s.
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Old May 5, 2008 | 10:48 PM
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Cool, That's awesome you got 1.95. Pretty good for the Sumi's, the best I could do with them is a 2.2 with 27 psi.
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Old May 5, 2008 | 10:49 PM
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those are not ment to run at the track
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Old May 5, 2008 | 11:02 PM
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30psi seems to work best, but they still suck.
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Old May 6, 2008 | 12:27 AM
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Lower the pressure as I said above. My 60's were all above 2.2 untill I lowered the pressure. Playing around with it I found 21 to be the best for me. Too much and they got worse too little and they got worse.
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Old May 6, 2008 | 12:39 AM
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If you get them hot, just like any other street tire, they will get really greasy really fast. So no John Force burnouts for you!


Just in case you weren't aware...
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Old May 6, 2008 | 12:58 AM
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Sweet. So little/no burnout, start at 30 psi and drop it from there, then save up for drag radials.. lol

And that's interesting about how they get greasy quick. I've never heard of that, I was planning on a long burn out (new to racing). Would Nitto DR's benefit from a decent burnout?
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