took 392 to track

[stumblinhorse]

I was just thinking about the tire size compensation this weekend, if you could modify it to get a higher max speed, so you just answered my question. I'm curious how "small" you can set the tires to increase the top speed? A shop next door has an interface that can do this without going to the dealership...any insight to settings?

John

I use the JScan app and it lets me set down to 28”.

Sponsored

 

[jlcalifornia]

Whatever he was racing beat him off the line, but was very very slow throughout. My guess, a Toyota Corrolla.

Lol, I was wondering as well. 17 seconds. Is normal street car times.

 

[utjmac]

I use the JScan app and it lets me set down to 28”.

Got it, so that would get 15% or limiter increase on 33s, around 20% on 35s., a little more for 37s. Cool.

 

[stumblinhorse]

Got it, so that would get 15% or limiter increase on 33s, around 20% on 35s., a little more for 37s. Cool.

Yes easily enough to exceed the speed rating for your tires.

 

[forcefedjunkie]

No, changing tire size will not do anything else in a 392. The ZF8 will adjust over time. But if you just change at the track nothing else will be effected for a couple runs. then change back to go home.

@forcefedjunkie did you brake torque launch, that will shave a tenth or so off…

Yes I did

 

[forcefedjunkie]

I was just thinking about the tire size compensation this weekend, if you could modify it to get a higher max speed, so you just answered my question. I'm curious how "small" you can set the tires to increase the top speed? A shop next door has an interface that can do this without going to the dealership...any insight to settings?

John

With the Aeroforce gauge I set tire size to 29" and this dropped the speed reading by about 10% so in theory I could hit about 110 true speed before the speedometer would read 100 and hit the limit. I don't know exactly how small of a size I can be allowed to enter.

 

[2nd 392]

With the Aeroforce gauge I set tire size to 29" and this dropped the speed reading by about 10% so in theory I could hit about 110 true speed before the speedometer would read 100 and hit the limit. I don't know exactly how small of a size I can be allowed to enter.

Use tire revs per mile for accurate number. My current 32.8” tires at 99 mph = 104.3mph on my ordered 34.5” tires. ?

 

[BlackGenesis]

Air down to 28 psi for better traction.
Those tires are garbage for traction on pavement compared to even summer only street tire.
Avoid water box at all cost.

 

[Rubi Bluez]

Mine finally got 500 miles, and as soon as it did, I floored it while going down the highway. I was blown away at how fast it was, and how hard it pulled! I was doing 65mph and in a few seconds I was going over 90mph?

 

[Jeepmojave85]

Surprisingly? Lol what is surprising about a 392 spinning tires in first gear? I have not driven the Wrangler but I owned a Challenger and that car could bark and spin tires on demand. 12.8 is good, my best ever was 12.8 on a good DA in my challenger. I had an unfair disadvantage of being in Colorado at altitude though.

Couple things:

Traction control? Needs to be off
How did you Launch? Break and gas, it’s something you have to get used to
Tire PSI matters - softer is better.
Burnouts? A small one on street tires will help warm the tires up. Here’s a video of my challenger going against my buddy in a hellcat, no tire spin.

 

[Rubi Bluez]

Surprisingly? Lol what is surprising about a 392 spinning tires in first gear? I have not driven the Wrangler but I owned a Challenger and that car could bark and spin tires on demand. 12.8 is good, my best ever was 12.8 on a good DA in my challenger. I had an unfair disadvantage of being in Colorado at altitude though.

Couple things:

Traction control? Needs to be off
How did you Launch? Break and gas, it’s something you have to get used to
Tire PSI matters - softer is better.
Burnouts? A small one on street tires will help warm the tires up. Here’s a video of my challenger going against my buddy in a hellcat, no tire spin.

Um… did I just witness a scat pack beat a hellcat?!

 

[Jeepmojave85]

Um… did I just witness a scat pack beat a hellcat?!

Noooo lol. The only bragging rights I got from this race was beating my buddy off the line

 

[ShockerRacing]

I wish I had known that it would have been ok to just adjust our tire size at the track to fool the computer for the top speed. I was afraid it would mess with the computers or something, but I was able to pull a 12.8 limited to 99mph. I've still been curious what it would have done that night if it wasn't limited.

 

[Rubi Bluez]

I wish I had known that it would have been ok to just adjust our tire size at the track to fool the computer for the top speed. I was afraid it would mess with the computers or something, but I was able to pull a 12.8 limited to 99mph. I've still been curious what it would have done that night if it wasn't limited.

This video was so damn impressive! Was he using the paddle shifters or just holding it to the floor and letting the trans do its thing?

 

[ShockerRacing]

This video was so damn impressive! Was he using the paddle shifters or just holding it to the floor and letting the trans do its thing?

I was just letting the Jeep do it’s own shifting.

Sponsored