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Old 12-10-2012, 09:09 PM   #1
fofo
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Default MT 315 Drag Radials. Air Pressure?

What's a good starting point on AIR PRESSURE for the MT 315 Drag Radial tire on a 2850# backhalf car, 1.80 1st gear & 4.10 rear gear, 638 with 2 stages? Mounted on 15" double beadlock wheels (pic below).

Thanks.
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Old 12-11-2012, 08:15 AM   #2
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Default Re: MT 315 Drag Radials. Air Pressure?

I would start at 13 PSI and work from there in 1 PSI increments.

Thanks,

Jason Moulton
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Old 12-12-2012, 09:15 AM   #3
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Default Re: MT 315 Drag Radials. Air Pressure?

Thanks Jason...working Higher or Lower in pressure, after starting with 13#?
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Old 12-12-2012, 09:20 AM   #4
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Default Re: MT 315 Drag Radials. Air Pressure?

Quote:
Originally Posted by fofo View Post
Thanks Jason...working Higher or Lower in pressure, after starting with 13#?
Higher. Most guys typically run 14-16.5 depending on weight and suspension.
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Old 12-12-2012, 11:40 AM   #5
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Default Re: MT 315 Drag Radials. Air Pressure?

Thx Renegade...see weight etc. in original post... est 2860# with 315s on the car...638, 2 stage n20, 1.80 1st, 4.10 rear. Goal is 4.59 @ about 157. Went 4.70 @ 140 with 33x10.5Ws lifting @ 4.19, cause it got goofy toward the guardrail. Currently taking off the Heads to do a fresh valve job.
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Old 12-12-2012, 12:27 PM   #6
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Default Re: MT 315 Drag Radials. Air Pressure?

Quote:
Originally Posted by fofo View Post
Thx Renegade...see weight etc. in original post... est 2860# with 315s on the car...638, 2 stage n20, 1.80 1st, 4.10 rear. Goal is 4.59 @ about 157. Went 4.70 @ 140 with 33x10.5Ws lifting @ 4.19, cause it got goofy toward the guardrail. Currently taking off the Heads to do a fresh valve job.
I usually run 15# @ 3000, 115-125% A/S
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