How hard do YOU launch?

[driller]

So I went to the track to do some tuning on the Blue Flame.

The car ran fairly well, I was testing different shift points to work on the tune. So occasionally I would pull into the pits to check tire pressures and change the tunes on the chip.

While checking the air pressure in the drag tires, a friend suggested I draw a line on the tires with something next to the valve stem to see if the rims were wanting to spin in the tire. I laughed out loud saying something to the effect that "I don't have that kind of power!"

Before I took back off to the staging lanes, I decided to humor him and took my dial-in marker and dabbed it on each wheel so it marked both the tire and rim.

After the event I loaded the car on the trailer and found this.

Look closer...

... and the other side...

I would have never believed it.

Oh, by the way the best of the day was 13.442 @ 101.94.

 

[Burbank 98 LSC]

Wow I would not believe either. You make some serious torque.

I am going to race track tomorrow with my black car and I will do the same to see if the tire moves on the rim.

 

[driller]

I am going to race track tomorrow with my black car and I will do the same to see if the tire moves on the rim.

Pfffffft... with your car, I'd say it's a given!

 

[DLF]

I've done that for years with both the Cobra and SC, I'll have to mark the DR's on the LSC, just to see.

 

[logres]

Actually doesn't surprise me...I've seen lesser cars slip the tire. Happens even more on decently powered front wheel drive cars, like Altimas.

It has to do with static torque vs dynamic torque. It takes MUCH greater torque to move something from 0(standstill) to 1 mph than from 1 to 2 mph.

I feel like giving a physics lecture:

Since there is a smallest unit of time (Plank's constant), if an object is stationary at time 0, then suddenly moving at Plank time (~10^-thirty-something seconds), it had to have experienced an acceleration of infinity. And since F=ma, an infinite acceleration is the result of an infinite force moving an object with any mass. In the instance of macro objects (like cars), the bond between molecules absorbs some of the force and either compresses or stretches, which is then released when force is decreased.

This is why top fuelers use tires that have flexible sidewalls that absorb the twisting force rather than allow the tire to spin around the rim. If you think JP's tires are spinning in his ~400hp beast, imagine what it would look like on a 10,000 HP hauler. I'd guess the wheel would just spin itself out of the tire.

I now JP is using drag Hoosiers, but even those are not anything like the top fuelers are using.

 

[BadSax]

Actually doesn't surprise me...I've seen lesser cars slip the tire. Happens even more on decently powered front wheel drive cars, like Altimas.

FWD cars you say...
I'm gonna check CaddySax tomorrow...

Pretty sweet JP...

 

[driller]

Tire flex?

Yeah, we've got that...

 

[driller]

Pics from the track...

 

[BadSax]

It looks like if you weren't waring those heavy FR500's up from you'd be able to lift the nose...

-J

 

[Burbank 98 LSC]

I also marked my tires today.
The first picture is after I marked them and the second picture is after three 1/4 mile passes.

 

[driller]

Yep, as I suspected.

 

[driller]

It looks like if you weren't waring those heavy FR500's up from you'd be able to lift the nose...

Yeah, we have to get some weight off that front end.

That and a higher stall converter are currently in the works. I'd really like to see low 1.8 / hi 1.7 sixty foot times.

 

[J]

That is cool...never even thought about that. You're losing time with that tire spin, haha.

JP...ever consider more weight in the trunk? I got 1.7 60ft times with my car fully loaded. Didn't know that was good until BlackIce was like "WTF?!", lol. It was on street tires too!