So, tonight at the track...I have questions..

[BannonJr]

I lost 2 10th's, and I think I know where...

Last year I was using 26.5x10.5x15 Hoosier pure slick...they're actually cascar truck series slicks that we had lying around, so we mounted them for fun...I went from a 14.5 to a 13.3...

This year, they were burnt up, so I bought Mickey Thompson ET Streets, 26.5x11.5x17 and bought 10.5 inch rims to match...I figured, hey, I'm dragging not oval racing, so well, better get some drag slicks...

Over the winter, I also put in a Tremec TKO-600 with a Steeda Tri-Ax shifter.

Between last track day, and this track day, I can't whatever I do break a 13.5

I did notice by my chalk mark, that my driver side mag, had spun about 4-6 inches inside the slick, and my right, about 3-4...

I tried my burnout , according to M/T tech advice...out of the waterbox...to do a medium to light burnout...but my brakes couldnt hold it, and naturally I spun like a twister off the line...once I got em in the water box, I could do a burnout, but against Mickey Thompson's advice...since they are a radial tire...

Now I'm tossed...

A. How to stop the wheel slip
B. Anyone else use M/T ET Streets in that size and what do you do for burnout?

I cant get my 60ft and 1/8th times back down

I'm running 267 HP to the wheels...

Hopefully I'll get some ideas from you fine fellows? (Any any ladies perhaps?)

 

[flstang65]

maybe some bead lock rims?

 

[BannonJr]

Ya, was thinkin that, but I think I'll look for other ways before I spend more money on rims...maybe try different air pressures...hmmm

 

[flstang65]

i guess you could try and sell the rear rims. i know you wont get what you paid for them but it'll help a little. what air pressures do you run?

 

[BannonJr]

I started at 15, then 13, then 12..i might try 10 and see whats up...its drivin me crazy

 

[BobHyatt]

Ya, was thinkin that, but I think I'll look for other ways before I spend more money on rims...maybe try different air pressures...hmmm

You can try bead sealer. Break the beads from the rim, coat it with this stuff that looks/smells like airplane cement, then inflate and leave alone for a while. Other choice is to drill the rim and install screws into the bead, which of course means you will be using a tube if you are not already.

 

[bhuff30]

What was the weather difference between the 13.3s and the 13.5s? It's very easy to loose .2 from the weather, especially in an NA car. Did you recored the conditions and density altitude for both sets of runs? Did you also loose mph? Same 60' times?
A 17x10.5 is a heavy wheel, especially compared to a 15" wheel. It is said for every 10lbs you gain in rotating mass, you loose .1s. Might just be the extra rotating mass slowing you down.
Also, I'm sure a TKO600 has more parasitic drag than your standard T45 or 3650, that will eat a few hp.
You never know what the tire monkeys will do to install a tire... maybe some oil or grease somehow got on the bead. Certainly, you shouldn't have issues with the tire rotating on the wheel at that power level.

 

[BannonJr]

Ya, my 13.3 was in sept or early Oct...this is july, much hotter....
I'm going to re-seat the rims and see if it helps...and run at 10psi...it's tough to heat em up like M/T told me out of the water ....mind you , the track isnt prepped at all on practice nights...

 

[MaxedGT]

Less tire pressure isn't always better. Try going up in pressure. Ever tried pushing a car with a low tire?