Gimp98TNT

iTrader: (21)

Hey guys, i was thinking of running a stiff sidewall slick this year. The tire is a Hoosier 29x10.5Wx15, I will also be running tubes in these. I'm just not sure if the stiff sidewall is going to work with my setup since i have never used them before.

Setup consists of a 403ci LS2 that trapped 128mph last year on motor, didnt get any good nitrous hits last year, but i'll be spraying 300 this year in 2 stages. Trans is a Rossler 400 with a brake, and a PTC 4200 10in converter, and 3.73 gears. Car has a full aftermarket suspension, raceweight is around 3300lbs.

I cut pretty consistant 1.33-1.34 60fts last year on 3yr old 28x11x15 goodyear eagles for comparision. I really need to get this thing into the high 1.2's. Do you guys think these tires will get me there?

mrdragster1970

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Tubeless, 3200 lbs, 476" 150 plate. 8.50's @159. Best tire I ever used. I used several, Hoosier & MT. You will like it.
Weights about right, might not have enough HP to need stiff, but it shouldn't hurt you too bad.
I switched to stiff right around 9.30-.50's. Good luck.

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Pro Stock John

iTrader: (34)

A number of folks have been running 28x10.5 and 29.5x10.5 ET Drag stiffs for a few years. They are popular in 7 and 8 second NMRA classes too. No idea on the Hoosiers.

N2RACINGLS1's

iTrader: (2)

Well here is what a M/T Tech Rep told me on the phone 2 days ago! It does not matter about horsepower as stated above. You have more then enough horsepower to warrent stiff sidewalls. What matters the most is the weight M/T stated if the car weighs more then 3,000 lbs you should be using a stiff sidewall. The weight of the car in question is why you need stiff sidewalls the other item in the equation is how the horsepower is applied to the tires. If you are a 6 spd car or using a transbrake according to M/T you should only be using stiff sidewalls.

Since you are cutting 1.33 sixty foot with the non stiff sidewall according to M/T you will see a better reaction time with a lower sixty foot by going to a stiff sidewall. The stiff sidewall will allow better traction since the tire is not wrinkling up as bad!

The trap speeds you stated above leads me to think NA you ran somewhere around 10.50 and are around 475 HP to the wheels NA. If you hit your car with a 300 shot of NOS you are going to see a big change in how that car reacts. If anything you had to much tire for your NA runs with a 3.73 gear. It should be just about right for the NOS you plan on running. One caution the tire you want to run is big and is going to hurt you on any NA runs. IMO

I would have to ask why you want to run a 29 inch tire? Your car surely was not running out of gear with the 28 inch tires with a 3.73 gear!

Anyway you should use the stiff sidewall for sure, consider the 28 inch tire if you are going to hit your first stage off the line say 100HP and then hit the second stage of 200HP in second gear.

Man that would be a blast for sure!

JL ws-6

iTrader: (50)

I'm running the 28x10.5x15S et drag. Very similar setups bewteen our 2 cars, and the stiff sidewall tires have worked very well so far. Best 60 so far, was a 1.35, right off the trailer forst run on the jug, with about 200 lbs out of the car and some more adjusting, I will not be surprised to see consistant low 1.3 to high 1.2 60 foots now.

Gimp98TNT

iTrader: (21)

With a 100 shot last year and the 28x11 goodyears (actually are 28.9 tall) i was trapping 137-138 range. I was crossing the traps around 6500 or so, cant remember exactly. So, with a extra 200 hp i think i'll need the 29's.

N2RACINGLS1's

iTrader: (2)

Now we are getting somewhere 6500 at 134 MPH with a 100 shot! Your car likes the nitrous. It picked up almost 6 MPH with the 100 shot on the average, I see in your sig you did have a 137.58 MPH as well. I was going off the only 28 inch Goodyear I could find that was close to 11 inches wide and that is a 10.5 wide tire which has a circumference of 89.4. But even with the 100 shot you still had RPM left!

With your setup do you have your rev limiter set at around 7,200 RPM's? If so with the added 200 shot you should be OK with the 29 inch diameter tire that you are wanting to run. One thing for sure you engine is not going to like you if you make a N/A run! It is going to struggle spinning those 92 circumference tires

Good luck and be safe sounds like you have a sweet ride! I know I love my Rossler transmission and it should hold up to anything you want to throw at it.

BMR Suspension

iTrader: (6)

Stiff sidewall slick is going to be a great choice.....

Pro Stock John

iTrader: (34)

I'm 1.38 on 28x10.5 ET Drag stiffs and 1.35 on 325-50-15 MT DR's.

kp

iTrader: (34)

I dont really run much quicker on the S tires than the normal ones. But they do last longer and that by itself is worth it. 1.25-1.28 60's are the norm for either on a good track, but that has more to do with the car and track than the tires, I have run the same 60's on 275 drag radials and 11.5x28 QRPs on a good track. Main reason I stick with the 10.5x28S is they work just about anywhere.

Last couple sets of 'S' tires I bought were a bit taller than the regular 10.5x28s as well so if you are short on room thats something to consider.

Gimp98TNT

iTrader: (21)

Kp, ur running M/T's right??

I checked the rollout on my old goodyears and they were 89" wore down to the wear marks. I bet they were at least 90" new, I'm not sure the 29's will fit, it'll be real tight. I'm going to have to throw my old set back and see how much room i really have.

Thanks for for all the help guys.

kp

iTrader: (34)

I run the 10.5x28S M/Ts, they measure closer to 28.5" when new. But last year they seemed a little shorter, unless my wheelwells are shrinking

Vetal

iTrader: (3)

May I steal the thread and ask which slicks will work better (more consistant) on really bad, unprepped tracks? Basically very old asphalt, no glue.
Right now I'm thinking about 28x11.5 ET Drags (11" tread, 13" section).
P.S. I'm M6, 350whp now, but installing turbo

tektrans

iTrader: (23)

I went from the Goodyears like you had to the MT stiff slicks and I couldn't get them to work right. I personally don't like them but that's just me, plenty of guys have went way faster than me on them.

I'm now using the Hoosier radial slicks and I absolutely love them BUT I haven'y tried them off the transbrake yet. I did get a 1.29 60' leaving off idle though.

JL ws-6

iTrader: (50)

If I had the room for a taller tire, I would have liked to try that radial slick bu tthey just weren't gona fit without some decent $ in bodywork

I would have liked to just stick them, or a 29.5 size slick on to see what that would have got me rather then changing the gears. Oh well

RAGENZ28

iTrader: (5)

I went like 1.30 or 1.31 on the back tires on a stiffwall M/T tire, small block on nitrous with a 4.86 gear, 4,500 stall with a TH400, it handled great, lasted a long time, I used the L8 compound 33x16.5S I think the stiff wall tires are a great tire. Didn't seem to need much burn out either.

Gimp98TNT

iTrader: (21)

I did the M6 thing for quite a while, i had the best results with Goodyear Eagles. Especally on the poorly prepped tracks.

JL ws-6

iTrader: (50)

Yeah, but a tire that big has so much traction, I can see where a minimal burnout is needed, which is gonna do wonders for the tire life as well.

tektrans

iTrader: (23)

It's really not much more work that a 28" inch tire. They are 29.5"s and they don't grow at all. You have to clearance the fenders front and back, just like for 28"s, roll the lip or cut it, then it's just a matter of hammering in the inners, just like the 28"s.

RAGENZ28

iTrader: (5)

33x16.5s isn't that big wait till you see my 34.5x17's mounted on a 16x16