Tire pressure

Ron Gusack · 08-17-2011, 05:47 PM

The shot below is at MIR with 9.5 pounds in a 32x14 on a 13" rim. I'm not sure exactly how far off the line it is, but I'd say at least 15-20 feet. Judging by the wrinkles, I think I need way more pressure. What should the tire look like this far out? Thanks for your help.[IMG]

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jmcarter · 08-17-2011, 06:36 PM

From the angle I can't tell how much roll you've got, any idea how much more loaded the Right side is? Also, car weighs about how much and how is it set up? 9.5 lbs sounds like plenty to me so other variables may be in play...

Ron Gusack · 08-17-2011, 08:36 PM

Quote:

Originally Posted by jmcarter

From the angle I can't tell how much roll you've got, any idea how much more loaded the Right side is? Also, car weighs about how much and how is it set up? 9.5 lbs sounds like plenty to me so other variables may be in play...

Car weighs 2800 with 1220 in the rear. I've never scaled the car with individual scales. It's got a mono leaf with sliders and ladder bars that I pre load the right bar until it leaves straight. The back of the car is too high and I'm working on that. Here's a video of the car last Saturday. I know the burnout was too long.

Michael Beard · 08-17-2011, 08:50 PM

Decals look nice on the car.

Doesn't matter what the tire looks like. Keep raising the tire pressure until it spins, then back it off. Run as much as you can get away with consistently. The car will work better on both ends of the race track, and you won't wear out the sidewalls on the tire so quickly.

Ron Gusack · 08-17-2011, 09:33 PM

Quote:

Originally Posted by Michael Beard

Decals look nice on the car.

Doesn't matter what the tire looks like. Keep raising the tire pressure until it spins, then back it off. Run as much as you can get away with consistently. The car will work better on both ends of the race track, and you won't wear out the sidewalls on the tire so quickly.

Thanks Michael, I'm happy with the way they turned out. I have a few tiny air bubbles that seem to appear when it's really hot out. The company that prints them should spend an extra dollar and use a larger box instead of folding the decal. I'm trying to come up with a way to mount the vinyl from the inside to protect it when cleaning the lexan.

At MIR I think I could have run much more air and still hooked. I adjusted the shocks up a click, but never tried more air. Thanks for your input. Should I go up 1/2 lb at a time?

Michael Beard · 08-17-2011, 10:50 PM

Throw 11-12psi in them and see if it sticks! Then baby steps.

Agree on the shipping boxes... sorry about that. I get them started, then pull taunt and squeegee. Typically, any small bubbles will disappear over time when exposed to the sun. Vinyl is somewhat permeable, and it'll 'suck fast' to the window. They are laminated, so they'll last.

Jim Wahl · 08-18-2011, 02:22 AM

Stick a pin in the air bubble making an itty bitty pinhole and push the air out working it toward the pin hole. Works great for all sizes of bubbles. Jim

Ron Gusack · 08-18-2011, 07:37 AM

Quote:

Originally Posted by Jim Wahl

Stick a pin in the air bubble making an itty bitty pinhole and push the air out working it toward the pin hole. Works great for all sizes of bubbles. Jim

I thought about that Jim, but I thought rain/stuff would get in the little pin hole and eventually make things worse.

08-17-2011, 05:47 PM	#1
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Tire pressure The shot below is at MIR with 9.5 pounds in a 32x14 on a 13" rim. I'm not sure exactly how far off the line it is, but I'd say at least 15-20 feet. Judging by the wrinkles, I think I need way more pressure. What should the tire look like this far out? Thanks for your help.[IMG][/IMG]

08-17-2011, 06:36 PM	#2
jmcarter VIP Member Join Date: Dec 2008 Location: Richmond Hill GA (and Port Ludlow WA) Posts: 4,284 Likes: 2,337 Liked 3,126 Times in 962 Posts	Re: Tire pressure From the angle I can't tell how much roll you've got, any idea how much more loaded the Right side is? Also, car weighs about how much and how is it set up? 9.5 lbs sounds like plenty to me so other variables may be in play... __________________ Jim Carter 2340 Super Stock 2340 SST/2340 Stock Set another place at the table

08-17-2011, 08:50 PM	#4
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Tire pressure Decals look nice on the car. Doesn't matter what the tire looks like. Keep raising the tire pressure until it spins, then back it off. Run as much as you can get away with consistently. The car will work better on both ends of the race track, and you won't wear out the sidewalls on the tire so quickly. __________________ Michael Beard - NHRA/IHRA 3216 S/SS

08-17-2011, 10:50 PM	#6
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Tire pressure Throw 11-12psi in them and see if it sticks! Then baby steps. Agree on the shipping boxes... sorry about that. I get them started, then pull taunt and squeegee. Typically, any small bubbles will disappear over time when exposed to the sun. Vinyl is somewhat permeable, and it'll 'suck fast' to the window. They are laminated, so they'll last. __________________ Michael Beard - NHRA/IHRA 3216 S/SS

08-18-2011, 02:22 AM	#7
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,843 Likes: 666 Liked 683 Times in 129 Posts	Re: Tire pressure Stick a pin in the air bubble making an itty bitty pinhole and push the air out working it toward the pin hole. Works great for all sizes of bubbles. Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association.