Tallest and widest drag slick.

[Yellow Horse]

I may have screwed up with the 4.10 gear install. I calculated my trap speed and it is slower than I thought with a 28 inch tall tire. My axle is laying on my shop floor. Hopefully I will get it in this weekend and I can do some measuring.

I figure I could run at least a 29 inch tall tire. I come up with 131 trap in fourth at 6200 (stock bottom end with a 3.6 KB) which I think is too slow. It may be a good combo for an 1/8 but I'm not sure about a 1/4. Jegs lists Hoosiers 29.5 inch tall tire with a 96 inch circumference. I come up with 93" or that tire is actually 30.5 in diameter. A 30.5 tall tire would give me a 137 trap speed which I think would be reasonable for a full weight GT500 around 20 psi.

Anybody know what the maximum tire height we can run and sectional width? If I can get a 32" on it would it run a good time as opposed to a 30". I have the Steeda sway bar relocation brackets so I can run a 15".

Any help appreciated. I hope to be on a track in 4-5 weeks. It's been fall of 2005 when I sold my 2003 Cobra the last time I made a pass.

Thanks

 

[stkjock]

29.5" is the biggest I recall seeing put on a S197 chasis

 

[19COBRA93]

The Cobra Jets run 30's. I don't know if anything bigger will fit.

I'm running 4.10's and 28's, and should be into the 130's trap speed. But I'll be running the RPM's a little higher than you. I know it's risky on these motors, but honestly I'm not real worried about it.

 

[VNMOUS1]

I run 4.10s and 28" stiffwall slicks. 750 rwhp.

6500 rpm at the stripe.

136-139 mph depending on the weather.

The Mickey stiffwall grows approximately 1" @ 130mph.

I'm at 6700 rpm on 28" drag radials because they don't grow.

Remember, a taller tire will kill your short times (as well as trap) unless you have a metric bunch of power to get them moving. I "almost" went with a 29" Goodyear this season but if they'd grown much I'd be at a 30!

Calculated traps are under the assumption that you have enough beans in there to make that happen in a quarter mile.

Bj

BJ McCarty
R&D Specialist
VMP Tuning
[email protected]
(321) 206-9369 x 112

 

[serickson1]

I run the 29x11 Goodyears with no issues.....I tried the 29.5 tire but they rubbed like crazy at about 1000'......that was an expensive pass...lol...

 

[shelby mark]

I run the 29x11 Goodyears with no issues.....I tried the 29.5 tire but they rubbed like crazy at about 1000'......that was an expensive pass...lol...

29.5 is tight fit

 

[VNMOUS1]

I run the 29x11 Goodyears with no issues.....I tried the 29.5 tire but they rubbed like crazy at about 1000'......that was an expensive pass...lol...

Yowsah

BJ McCarty
R&D Specialist
VMP Tuning
[email protected]
(321) 206-9369 x 112

 

[Yellow Horse]

I went to Hoosier's website. Their 29.5 x 11.5 x 15 is listed as 30.5" in height with a 96" circumference. There other tires are all the same height as the tire designation.

If I go with a 29 I will make sure it is 29. I'll have to choose between 28" and 29".

I'd hate to blow up my motor but I plan on building another motor in the next couple of years. I'm more worried about breaking the motor and oil putting me into the wall.

Thanks,
Yeller

 

[Yellow Horse]

I run 4.10s and 28" stiffwall slicks. 750 rwhp.

6500 rpm at the stripe.

136-139 mph depending on the weather.

The Mickey stiffwall grows approximately 1" @ 130mph.

I'm at 6700 rpm on 28" drag radials because they don't grow.

Remember, a taller tire will kill your short times (as well as trap) unless you have a metric bunch of power to get them moving. I "almost" went with a 29" Goodyear this season but if they'd grown much I'd be at a 30!

Calculated traps are under the assumption that you have enough beans in there to make that happen in a quarter mile.

Bj

BJ McCarty
R&D Specialist
VMP Tuning
[email protected]
(321) 206-9369 x 112

I run the 29x11 Goodyears with no issues.....I tried the 29.5 tire but they rubbed like crazy at about 1000'......that was an expensive pass...lol...

What RPM are you guys leaving at and what is your 60 foot times?