Tire Pressure When Drag Racing? - Sportbike Forum: Sportbike Motorcycle Forums
View Poll Results: Your Drag Racing Rear Tire Pressure?
20-24 PSI 2 28.57%
25-28 PSI 2 28.57%
29-32 PSI 2 28.57%
33-44 PSI 1 14.29%
Voters: 7. You may not vote on this poll

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post #1 of 12 (permalink) Old 07-29-2002, 08:14 AM Thread Starter
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Question Tire Pressure When Drag Racing?

When you are drag racing.............What is your rear tire pressure set at on DOT tires?

Hmmmmmmmmmmmmmm


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post #2 of 12 (permalink) Old 07-31-2002, 01:00 PM Thread Starter
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GEEZ..............No answers on this question?


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post #3 of 12 (permalink) Old 08-02-2002, 04:59 PM
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You could lower some compaired to what you run on the street but i wouldn't go anything less the 25 - 30 psi depending on weight.
Personaly i don't touch tire press when i drag race lowering to to much will effoct ET and MPH
Unless it is spinnig i wouldn't mess with it.
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post #4 of 12 (permalink) Old 08-08-2002, 01:17 PM Thread Starter
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Let's keep the "racer input" rollin' in!


Johnny
Team No Limit Racing &#169 1996-2002
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JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......
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post #5 of 12 (permalink) Old 08-08-2002, 07:05 PM
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WHat esle could i try to help with ???
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post #6 of 12 (permalink) Old 08-23-2002, 06:59 PM Thread Starter
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I was hoping for more feedback...................That's ok!

To follow is a breakdown that friends of ours and our team riders use:

M/T MCR2 Tire = 7-11lbs
Pirelli/Metzler = 20-28lbs (variables to include ambient temperature)
Dunlop = 23-28lbs (same as above)
Michelin = 24-27lbs (same as above)
Avon = ? NO CLUE...........Anyone run these?

"Big Wheel" Tire such as a Hoosier = 6-12lbs

Thanks For The Participation!


Johnny
Team No Limit Racing &#169 1996-2002
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JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......
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post #7 of 12 (permalink) Old 09-16-2002, 05:39 AM
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Jammin-Johnny,
Everyone on this topic kept saying 'tires' as if they were referring to both front and back. I generally run a little lower pressure in the rear and increased pressure in the front. There is no solid answer to your question, however. It depends on many other factors as well. For example, if you were running a small displacement bike you would almost certainly be better off running higher than normal pressure both front and back, as the lower HP may not benefit all that much from greater traction, but this would be a hindrance all the way down the strip.

If you have some serious power, than the benefits of lowering the rear tire pressure would, in most cases, be helpful. But then again, a wider or flatter profile tire may render similar traction but enable higher pressure and thus less rolling resistance for the remaining 90% of the run down the track.

This subject also brings up all the other elements of rolling resistance, which are rarely even considered. And serious competitors need to look at their brake drag, the added resistance of all those axle seals, and even the heavy axle grease. And don't forget that hard to rotate drive chain. X-ring chains are much easier to flex than standard O-ring chains. Even non-O-ring chains should be considered here.
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post #8 of 12 (permalink) Old 09-16-2002, 10:28 AM Thread Starter
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The tire pressure theory is ok.............But not one that I prescribe to. Here's why:

With 14/48 (1) & 14/50 (2&3) gearing, different tire preasures and the same machine (my '94 ZX6E) these are some of the best ever #'s posted.

1) Michelin Race Compound @ 32psi = 7.359 @ 94.75, 1.875 60' @ 98*F
2) Metzler Race Compound @ 26psi = 7.157 @ 101, 1.674 60' @ 65*F
3) Metzler Race Compound @ 27psi = 11.354 @ 121, 1.783 60' @ 83*F

1) Rialto Raceway, July 2000, 1/8 mile
2) Irwindale Raceway, January 2002, 1/8 mile
3) California Speedway, March 2002, 1/4 mile

This with a 600 machine "built" to the AMA/PROSTAR regulations for 600 SS!


Like more info.................


Johnny
Team No Limit Racing &#169 1996-2002
http://www.teamnolimitracing.com

JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......

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post #9 of 12 (permalink) Old 09-16-2002, 02:22 PM
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Well i'll answer but doubt this will help you any. I run 38 rear and 33 front. Thats what i use on the street too. My "drag" bike is also my daily ride. I have pretty hard mez4's on right now and i can't seem to break them loose at the place where i run. So i see no need to change.
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post #10 of 12 (permalink) Old 09-16-2002, 09:27 PM Thread Starter
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Thumbs up

No one is asking you nor anyone else to change.........Just a way to gather and pass-on racing info.

BTW..........My "E" started a "street" & "strip" machine. Now it is more "strip" than "street" but does roll on the street......Occasionally.

KEEP UP THE GOOD WORK!


Johnny
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http://www.teamnolimitracing.com

JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......
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