Hoosier Radials

[tommy d]

Originally Posted by HR9121

I typically run 21-23 psi in my 30×9 Hoosier radicals. Have had as much as 28. I would suggest 18 and go up from there until you find a comfortable setting.

21 is a number we have been hearing. Right now it wobbles bad enough that you can see it from the fence.

[Hacksaw]

I run under 15 lbs all the time. My rule of thumb is....increase the tire pressure until you subject yourself with radial tire wobble....then go lower in psi.

[1320racer]

radial wobble has nothing to due with air pressure and everything to due with track prep and chassis setup.

Oh and I run 21 psi my 32/13.5 radials.

[tommy d]

Originally Posted by 1320racer

radial wobble has nothing to due with air pressure and everything to due with track prep and chassis setup.

Oh and I run 21 psi my 32/13.5 radials.

I think that going from 14 -21 would have to help...no? Only been out three times and this last week was the first for the wobble.

[1320racer]

I posted this photo for a reason. My car was killer at this track/at this race and IIRC, I ran five, 5.60s in a row, won the boggie race too.

Then once the sun went down and the track cooled, it was a different car and I had radial wobble every pass and had this not been an 1/8th mile race, I would have had to lift.

Point being it was the track not my car.

Left that track, made no changes and the car was right back to perfect launches, passes where ever I raced it.

BTW, that was the last time my car has had radial wobble and that was 7 years ago this November.

[tommy d]

Originally Posted by 1320racer

I posted this photo for a reason. My car was killer at this track/at this race and IIRC, I ran five, 5.60s in a row, won the boggie race too.

Then once the sun went down and the track cooled, it was a different car and I had radial wobble every pass and had this not been an 1/8th mile race, I would have had to lift.

Point being it was the track not my car.

Left that track, made no changes and the car was right back to perfect launches, passes where ever I raced it.

BTW, that was the last time my car has had radial wobble and that was 7 years ago this November.

Ok. makes sense as that was the same for us. This past week was the first night time passes and that's when we started having trouble. Thanks for the help.

[Ed Wright]

I don't know what width wheels you have. I found my 13X31" Hoosiers hooked harder, and felt more stable on wider wheels. Went from 12" to 14" wide wheels, no more wobble at all.
Then, I bought a second set of 14" wheels & bought a pair of MT tires, same size. A-B-A testing during a track rental showed the MTs 5 hun quicker, close to one MPH faster. I use 13 to 15 psi to help corrrect my lights. Both dead hooked, I'm thinking the time differences were maybe sidewall design?
Been so long, I don't remember how much air in the Hoosiers. Have run the Mickeys as low as 12, still no wobble on the 14" wheels. Both brands of tires left better foot prints on 14" wheels.