Bias Ply Tire Pressure

Andy Friar · 09-17-2020, 10:45 AM

I am looking for feedback on tire pressure and amount of 'wrap' on our tires at launch. I know people on here have more experience and I was hoping to hear what pressure other people have run bias ply tires at. We are running 14.5psi, 3600rpm launch and 30 x 9 x 15 Hoosier D05's on a 10" rim in this video. 1.55' 60 ft in this video as well while weighing in at 3440 w/ me in the driver's seat. We are only running bracket races currently, but the car is setup as a skinny tire SS car. Thanks for the help.

cad · 09-18-2020, 03:01 PM

That looks pretty darn good. The weight of the car, how much hit, and how much hp affect it. I ran a 3055S MT on my 68 Camaro with 12 psi, and the slick always looks good in slomo.

Clark

Joe DeMarzo · 09-18-2020, 04:19 PM

Andy., when I run the bias tire, Hoosier 30x9x15 D 05 I run minimum 18 lbs and up to 22 lbs depending on the track. Car weights 3400 plus. Looks like your climbing the tire and should pump it up 2 lbs at at a time to see what your car likes best. Good luck.

Adger Smith · 09-19-2020, 10:32 AM

You also need to watch the surface of the tire for full contact "feather".. The tire will tell you if it is making proper full contact.
Bias tires work the sidewall. Most of the time Too little air over works sidewalls.
Somewhere I have a real good picture of a run with my car when it was killing the sidewalls from low air pressure.

Andy Friar · 09-19-2020, 04:22 PM

Thanks for the reply's and experience shared. Our buddy Dave has been all over us to add more air. Looks like I will this Sunday at Milan. Nostalgia Drags with Nitro Funny Cars, Gassers and 1990 and older bracket racing. Should be a good time!

HR9121 · 09-20-2020, 07:54 PM

I'm with Joe I normally would run 18 to 22 psi and have ran it at 24 before. My car most races at 3650 and sixties around 1.47 Like Joe said keep adding in 2 pound increments until you find the sweet place.

09-17-2020, 10:45 AM	#1
Andy Friar Member Join Date: Aug 2013 Location: Howell, MI Posts: 242 Likes: 674 Liked 220 Times in 72 Posts	Bias Ply Tire Pressure I am looking for feedback on tire pressure and amount of 'wrap' on our tires at launch. I know people on here have more experience and I was hoping to hear what pressure other people have run bias ply tires at. We are running 14.5psi, 3600rpm launch and 30 x 9 x 15 Hoosier D05's on a 10" rim in this video. 1.55' 60 ft in this video as well while weighing in at 3440 w/ me in the driver's seat. We are only running bracket races currently, but the car is setup as a skinny tire SS car. Thanks for the help. __________________ Andy Friar Last edited by Andy Friar; 09-17-2020 at 05:03 PM.

09-18-2020, 03:01 PM	#2
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 673 Likes: 141 Liked 72 Times in 40 Posts	Re: Bias Ply Tire Pressure That looks pretty darn good. The weight of the car, how much hit, and how much hp affect it. I ran a 3055S MT on my 68 Camaro with 12 psi, and the slick always looks good in slomo. Clark

09-18-2020, 04:19 PM	#3
Joe DeMarzo Senior Member Join Date: Oct 2002 Location: Mahopac, NY Posts: 666 Likes: 48 Liked 114 Times in 9 Posts	Re: Bias Ply Tire Pressure Andy., when I run the bias tire, Hoosier 30x9x15 D 05 I run minimum 18 lbs and up to 22 lbs depending on the track. Car weights 3400 plus. Looks like your climbing the tire and should pump it up 2 lbs at at a time to see what your car likes best. Good luck. __________________ Joe DeMarzo 1317 STK

09-19-2020, 10:32 AM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,349 Likes: 435 Liked 677 Times in 261 Posts	Re: Bias Ply Tire Pressure You also need to watch the surface of the tire for full contact "feather".. The tire will tell you if it is making proper full contact. Bias tires work the sidewall. Most of the time Too little air over works sidewalls. Somewhere I have a real good picture of a run with my car when it was killing the sidewalls from low air pressure. __________________ Adger Smith (Former SS)

09-19-2020, 04:22 PM	#5
Andy Friar Member Join Date: Aug 2013 Location: Howell, MI Posts: 242 Likes: 674 Liked 220 Times in 72 Posts	Re: Bias Ply Tire Pressure Thanks for the reply's and experience shared. Our buddy Dave has been all over us to add more air. Looks like I will this Sunday at Milan. Nostalgia Drags with Nitro Funny Cars, Gassers and 1990 and older bracket racing. Should be a good time! __________________ Andy Friar

09-20-2020, 07:54 PM	#6
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,353 Likes: 112 Liked 2,869 Times in 641 Posts	Re: Bias Ply Tire Pressure I'm with Joe I normally would run 18 to 22 psi and have ran it at 24 before. My car most races at 3650 and sixties around 1.47 Like Joe said keep adding in 2 pound increments until you find the sweet place. __________________ James Williamson W200 J/SA