what air pressure for big slix

[olds48]

I wasn't sure what topic to go to.I guess this will be it.I am in the process of tubbing my car and am unsure as to what ir pressure to start testing with.Before I was running 28x9 ET Drags and was setting them at 11.25 on the driver side and 11.00 on the passenger.The car would never sit still long enough to do a burnout withh 11 on both sides.Acted like driver side was trying to come around.We decided that since I was sitting on that side,maybe the extra weight was causing a larger foorprint.Always ran a quarter pound more after that and had no problems. :? I am going with a 33x16 tire in the back now.Way bigger than what I need,but worth some serious style points :D .So where to start?I've been told around 8 psi,but will that be enough to be stable?Any and all points of views and ideas welcome.Thanks

[curtisreed]

How much will the car weigh?

Curtis

[spib]

e-mail manufact of slicks and tell them what you have, they will give you, somewere to start, I asked hoosier abought mine, and they said start around12-14 and I run around 10

[olds48]

Car wieghs about 3200 lbsand rear weight is 1550

[curtisreed]

Spib is right the manufacturer knows the most about their tires, that said I would start with 9-10 lbs and work from there.

Curtis

[olds48]

SOUNDS GOOD. THANKS GUYS. WHERE I WAS TALKING ABOUT HAVING TO RUN UNEVEN AIR PRESSURES TO LAUNCH STRAIGHT,ANYONE ELSE EVER RUN INTO THAT? JUST WONDERING WHAT MY INTIAL PROBLEM REALLY WAS.

[I972Nova]

my dads nova weighs 3180 and we run 7 pounds in a 16x33 goodyear slick on it...I only run 5.5 in my 17x33 on the dragster but that isnt helpful here..lol...I Hope this helps... As far as uneven tire pressure sounds like you need some preload???

Josh

[olds48]

:shock: Shed some light on me .This is the first set of ladder bars I've run.I know next to nothing :oops:

[I972Nova]

there is a nice post a few down in here titled "preload" that breaks it down pretty good...

[olds48]

:oops: duh.....

[I972Nova]

I am sorry my input wasnt helpful...

[olds48]

NO WAY! EVERY BIT HELPS. THANKS FOR YOUR TIME :D

[zcar]

The best way is to watch your slicks on the edges after you have made a burn out, look at the very edge of the slick, you will have excess rubber build up where the slick is actually contacting the track. You want the excess to be on the slick edge, hope this helps, with your weight probally start out between 7-8 lbs.

[Tod74]

I have a 3050 lb car with ladder bars. I run 8-10 pounds.

[olds48]

Thanks all you guys

[rob41willys]

I run 33x15 goodyears at about between 7-8 lbs. pretty light car with 4-link though. As far as the back end wanting to come around on the burn out if you can jack some weight in the left front that would help also. ( puts more load on the right rear )

[olds48]

Sounds good.Thanks man

[bowtie4542001]

I had 14.5x32 on a 2800lb Nova and was running 10lbs with no problem. I agree to call the manufacture though to get a rough esitmate. Then play around with it a little to get the best 60' times. Good luck and keep us informed.

Chris

[fla1976]

With the tires inflated to the same pressure, check the circumference of the tires to see if they are the same. They may be different and the difference in pressure may equalize the size. I ran 7.5 in my Hoosier slicks. Both were the same circumference within an eighth of an inch.
Paul (fla1976)

[olds48]

I can understand different pressures to equalize the rollout,is there a certain range the tires have to stay in?Like only a 2 pound difference or something like that?

[rob41willys]

I would keep the pressure difference limited so you dont have handling problems on the top end. I would try and tune the chassis set-up rather than use air pressure as a crutch. just my thoughts

[slowmotion]

I've heard that when a car comes around sideways on a burnout, It is because you don't have enough wheel speed. My malibu was doing the same thing. So I did my burnouts a little harder and the problem went away.

[zipper06]

May not be much help on a ladderbar car, but i have 14X32's GY's on the malibu, which weighs 3253lbs 4 link setup, and i run 10.5 lbs air, it doesn't seem to matter much on my car since it always shoot for the moon on launch anyway, but i did notice if i ran less pressure it didn't handle as good on top end.

Just my setup though.

Zip.

[olds48]

Handling on the big end is my main concern.I got way more tire than I really need right now,only 700 hp,so launching is not concerning me,too much.High speed handling is what bothers me.Was running 28x9s.What should I expect? And thanks to all you guys for all the advice so far.Helps more than you know

[rob41willys]

I agree with zipper06 that to low of air pressure could cause handling problems on the top end. What are you going to be running for mph?I would start at about 10psi and go from there. Making small changes till your 60 ft. are the best then you can make small changes for varying track conditions. Also 60ft times vary from track to track so just look for consistency and dont worry that your 60ft times may fall off or pick-up. The main thing is staging the same way everytime.

[olds48]

I'm running 1/8 mile,so I'm only hitting 98 mph for now