Didnt know if it should post here or in "The Hides" but what do you big tire guys run for air pressure in the slicks. Running 14x32x15. My guys at Voss Racing run 5 PSI on the prostock car. I've been running 6 on the Hawk. It did help with traction on launch but seems sort of washy at the top end. In fact in round 3 Sat I was coming up on the L lane pretty fast at the stripe(he had a full second head start on me) Peddled a bit and the rear of the car pitched sideways, bounced about 3 times before I got it straightened out. Spectators thought I was gonna wreck. Sorta scared me for a second as I was going 5.46 @ 126 mph in the 1/8. Just when I start to get comfy something like this happens. Also Last few runs it wants to go sideways in the burnout. Wasnt doing it a week ago. See nothing different in the rear suspension.
I ran 7.5 on that car when I had it. If the track was really sticky then more psi. I also ran no tubes. Not sure if you are running tubes or not. I have noticed a difference when running tubes with psi. Also that is not an ideal car to get in and out of the throttle on. I don't recommend it. If you need to scrub some e.t. then lift or ride the brake some. You are at a whole different level of lifting off the gad and stabbing it full throttle again. It will upset the suspension and something bad could happen. John jr
Often going sideways in burnout is that there is a little more water on one tire. Sometimes a car will have dragged some water out. We have plenty of torque...I would pull further out of water before starting burnout if you aren't already.... If it was my car I would run radials on it....more PSI more stable on top end. I went from running 10.5 (only hooked between 10 and 11) to 16.5 PSI with radials. Now hooks between 14.5 and 17. Obviously your PSI will be lower but I bet 12-14 would work on your Hawk....if you went to radials....
No tubes. Just coated the inside of the slicks with Dawn. Something really bad nearly did happen. If it didnt happen so quick I might have soiled my fire suit I was down to 14 on the DR's and couldnt get it to hook. Went to the slicks. Once I get some more bugs worked out I may go back to the radials and try it again
When I ran your size slicks - 12-13psi on well prepped track, hooked real hard. When running my 255-275 DR I run 20 and go mid 1.30’s on a No Prep track. I am no expert but have learned that the chassis and suspension set up right, is way more important than just the tires.
My 29x10s are now where near your size and my car with me in it is 3650....I have to run about 17-18 psi in my hoosier slicks or the sidewall gets all twisted out of shape. Have a picture where the sidewall is so folded ove you can hardly see either of the 2 o's in hoosier. When the sidewall does this the thread gets all balled up too. Going to try a stiff wall slick next time
Not really. Drag radial is most times considered a street tire. 315 275 etc. Radial slick is slick w radial construction. I thought he possible had a 315 on the car at some point
Yes if you are talking DOT drag radial but now with MT PBR and Hoosier DBR...drag radial slicks are the way to go.
When he bought it from me it had Pro Bracket Radials on it. I ran them at 14 and went as high as 17 on a good track
That's the ballpark that we ran our pro bracket radials at as well, albeit only a 30x9. I found that if it spun increasing the pressure helped.
I've never run any radial tire......but I've heard that they often don't recover well if they break traction either on the line or down track
As Denny said the car had PBR's on it when I got her. They were like new so my intentions were to go with that. Just would not hook even at 14lbs.. Then found and purchased a set of Goodyear Eagle slicks. Those will hook to the point of slipping the rim inside of the wheel. Each side has moved several inches over the last 10 - 12 runs. Cars done a 1.18 60'. Last Friday / Sat she did several 1.20 and a 1.19. with a .020 light (3times) . Next outing I'll go up a couple pounds in the slicks to maybe 8psi . In the pic above you can see the wrinkle in the side walls as she was coming out of the water box sideways. Dont have a still shot of the rear tires on the hit. Maybe can pick it up off one of the youtube vids. "itsjustbriz" channel
If the tires are walking on the rim you can put rim screws in to stop it.......not quite as important with out tubes, but with tubes like I run you can destroy the tube thst way
Just out of curiosity, what do people run in MT ET Street SS tires? 295/65-15. MT says 14-18 PSI, seems low to me...........
In the regal I spun a wheel and it ripped the valve stem off the tube . Instant flat= hard R turn on the hit
Steve, I run the same MT in a 275/60-15 and I am up around 22 psi. But I have a lot of overhanging weight that works to my benefit. I originally started at 18 psi and just kept raising it. I'm also at 22.5 psi in the 29 x 10 slicks. Absolutely no wander down track.
