WAHUSKER

iTrader: (4)

Bill, Boyce, etc

Ellis & I are going to take my sled down to the Bonneville 100 in June & I need to pick out some tires. I want to run 315s on the back so I have some traction for the 1/2 mile shootout (or 1 mile if the let me). This really limits my choices. I've only found BFG KDs & Goodyear F1 GS-D3s in that size. If I thought they would hold, I see Toyo makes the RA-1 in 275/40/17.

Any toughts or suggestions? (GT-2 class, 120mph target, 140 tech, 4400lbs)

And where should I take my car for an alignment? I searched & couldn't find that old thread.

Racehead

Mark my best advice to you would be to take 2 sets of rear tires, or use the RA-1 in the 275/40/17 size. I would NOT try to run 315's on the back during the actual run. You don't know how much it might squat ( it WILL squat ) and so can't predict what might rub. When you're buzzing along at high speeds you don't want to have little thoughts going thru your head like "what was that noise ? Was that a tire rubbing ? " JMHO I think Boyce's favorite alignment place was Speedware or something ?

PS I'm jealous !

WAHUSKER

iTrader: (4)

Great minds think alike....Ellis said the same thing about 315s. If I had unlimited funds I would buy a set of the Toyos & got take the PR class to see how they do. But I will probably do that on street tires & then buy new ones for the race. It will give me a chance to check out different shock settings for cornering.

As for 2 sets, I didn't think they'd let you change tires? It would be nice if they would let me do the training session & shootout on 1 set & then change the rear tires.....I have a feeling traction could be an issue with 275s on the rear of my car, even at altitude.

NWDragRacer

June .... Hmmmm

Lets fire up my alighment machine and do it ourselves. I can get the tech who used to run the thing everyday to come by and get us started.

WAHUSKER

iTrader: (4)

Now just how many major projects can one OLD man work on?

What alignment machine?

ram-it

Mark, at the speed your talking about your tire options are almost limitless. I do not think you will have a real squat issue at your target speed either. I used the RA-1's over the summer and put over 800mi on them at the track. Great tire but took some getting use to because 1. I did not get them shaved and should have and 2. Started off with too much air. So your going to run 1/2 to a 1mi ***** out on a non-asphalt surface? I have no idea what kind of tire works best on that. If you are going straight the RA-1 might not be the best tire for you. Its a road racing tire that is meant for turns. Why not run a street tire? 140mph target speed is not that hard on tires. FYI, here is some info on tire loading as recorded by Motor Trend during their top dog contest. For a street tire that can do over 200mph and they used it for the 1/4mi too is very impressive.


Born For Speed
Michelin Pilot Sport 2

• When the Hennessey Viper ran 217.9 mph, the 335/30ZR20 PS2 tire was rotating about 3000 revolutions per minute--or about 50 revolutions per second.
&bull At 200 mph, the centrifugal load at the tire sidewall would be about 350 pounds. At 60 mph, the load would be just 30 pounds.
&bull At 200 mph, the diameter of a PS2 tire grows only 2 to 3 millimeters.

WAHUSKER

iTrader: (4)

Merry Christmas Eric....where you been?

This will all be on an asphalt Nevada St Hwy. They named it Bonneville cus Wendover is close to the border / salt flats. I'm thinking now the RA-1s might be the best option. The Pilots are good tires, but they had some blow outs in ORR events & I'm a bit leary of them. Street tires would be fine for the ORR, but in a 275 they won't keep my car hooked up for the 1 mile 0-top speed event. They'd be smoking for the 1st 1/4 mile....

Amorget

ORR = Open Road Racing, I think Eric was confused with Off Road Racing

I'd suggest a body and suspension lift and 33" Super Swampers ;-)

ram-it

Hi Mark and everyone else too! Been busy with life in general but hope to be more visible this year. The Bonneville through me off. I know they do high speed runs for miles on end there. Therefore, I can guarantee you the RA-1's will do the job for you. Be sure to get them shaved and start off at around 30-32psi so they will be right around 40psi when you finish. You will want to do some mock runs in order to find out exactly how much pressure will build up. I never did 100mi straight without stopping. I would get about 15-20laps in before I would stop and check things. The tire pressure would be up to 42psi in that short of time. I would bleed some off and go back out. This would be repeated until it would maintain 40psi. That's how I learned where I need to start out when they are cold.

GEARHED

iTrader: (5)

Bout time you showed up!
Quit being so invisible - it hurts running into you that way.

Poik

Pff, who cares? You're just going for trap speed right?

WAHUSKER

iTrader: (4)

While that is true, you ever been in a car with the ***-end skating around at 125mph?

WAHUSKER

iTrader: (4)

ROTFLMAO

Poik

lol, no, not yet.

sardog46

just run your slicks *****!!! what are you planing on topping out at 180-190 i think you will run out of gears before you even have to worry about tire concerns. thats just for the 0-top speed runs of corse, but if it was me i would run the whole thing on a set of nitto drag radials, just might have to slow things down to about 100 or so in the corners, but i would think they would hold up alright. but once again that just a guy talking who likes to go fast in a stright lline.

Racehead

Yeah on 2nd thought I'd do whatever Sardog told you to .... and if you DO get a little sideways at 125 mph just keep your foot planted right Sardog ?! lol !

sardog46

hey it was just a suggestion.

Is the standing mile a stright line? If so i would not see an issue with using a drag radial with a little bit of a sidwall. hell there are cars out there that run over 200mph on d/r. now for the corners i would go with whatever the experts say, but like i said before mark shure that thing will stay cool with that huffer blowing fulll steam?

LS1 Mopar Turbo

Man that sounds awesome Mark.

NWDragRacer

Hey POT, How's it going black?

The one in the corner that I bought from a Less Schwab that was in daily production. It's a full FMC commercial laser alignment machine with all the setup fixtures and calibration tools.

Paid $200

See you this week and we can drink that Mike's!

TwoFast4Lv

iTrader: (8)

Well seeing how MY *** is going to being in that red rocket also.. We better make sure they can carry all that Wieght! Last thing I want is a damn blow out at mile 48 on the return trip doing 140!

From what I have herd they make tires to carry Ego's MUCH larger then ours so we should be good.

BTW Mark picked up GPS today