[Ruthlesszl1]

Hey I have a 2020 zl1 looking to do a 15 inch conversion and the car has a manual trans. What size Hoosier would work best? How wide can you go without clearance issues?

[TOSTO RACING]

I run a 30x9 radial slick on a 15x10 inch rim no rubbing anywhere been 1.35 60'

[laynlo15]

Originally Posted by Ruthlesszl1

Hey I have a 2020 zl1 looking to do a 15 inch conversion and the car has a manual trans. What size Hoosier would work best? How wide can you go without clearance issues?

What kind of power are you making that you need a 15" conversion? I ran a 17" with 850 rwhp on my 16 SS and hooking with a 305-45-17 MT Street R, ran 9.41@147 w/1.35 60ft. Just trying to save you some money that you could use some place else. I run a 17" Hoosier 28x10-17 with 707 at the wheels and you for sure need a slick with an M6. I'd look at the 28x10 or the 28x10.5-17 Hoosier as you mentioned in your post above.

[94guy]

275/60/15

[JSH]

Originally Posted by TOSTO RACING

I run a 30x9 radial slick on a 15x10 inch rim no rubbing anywhere been 1.35 60'

I had to comment on your signature, 9.58 @ 145mph, when I ran 10.35 at 145 last weekend. Something's not right here.

[Joshinator99]

Originally Posted by JSH

I had to comment on your signature, 9.58 @ 145mph, when I ran 10.35 at 145 last weekend. Something's not right here.

Nothing weird about 9.58@145. I’ve run multiple 9.6x at anywhere from 145-149 MPH. Your time is what it is because you were having traction issues but your trap speed shows that’s you’re making good power.

[Joshinator99]

Originally Posted by 94guy

275/60/15

I’d do 325/50/15 unless you’re in a class that requires the smaller tire…

[danhr]

Originally Posted by Ruthlesszl1

Hey I have a 2020 zl1 looking to do a 15 inch conversion and the car has a manual trans. What size Hoosier would work best? How wide can you go without clearance issues?

What are you looking to race in with the car (i.e. drag strip, street dig, street roll, etc)?

How much rwhp?

picking a tire without knowing those two things is pointless.

[94guy]

Originally Posted by Joshinator99

I’d do 325/50/15 unless you’re in a class that requires the smaller tire…

i have seen a few guys go 325/50/15 then switch to the 275/60 and saw no improvement

[laynlo15]

Originally Posted by JSH

I had to comment on your signature, 9.58 @ 145mph, when I ran 10.35 at 145 last weekend. Something's not right here.

He runs at my track (wwtraceway), its a twin turbo that he's still dialing in, turbo 400 conversion. Should go in the 8s when he's done tuning it.

[TOSTO RACING]

Originally Posted by JSH

I had to comment on your signature, 9.58 @ 145mph, when I ran 10.35 at 145 last weekend. Something's not right here.

You are correct. I was leaving soft on that pass it was a 1.35 60 foot. It needs to be in the mid 1.20's and around 9.00's at 145 to be where I want it .


If you want to know how well your car is working do this, 1320 divided by your mph! That will tell you how well your combo works, my Stock eliminator cars will out run this calculator or right with it.

When this car is all dialed in I'm hoping for mid 8's at 155 or so.

[JSH]

Originally Posted by TOSTO RACING

You are correct. I was leaving soft on that pass it was a 1.35 60 foot. It needs to be in the mid 1.20's and around 9.00's at 145 to be where I want it .


If you want to know how well your car is working do this, 1320 divided by your mph! That will tell you how well your combo works, my Stock eliminator cars will out run this calculator or right with it.

When this car is all dialed in I'm hoping for mid 8's at 155 or so.

All I tried to say was, one of us is over performing and the other under performing and I honestly don't know which is which.

[wnta1ss]

Originally Posted by JSH

All I tried to say was, one of us is over performing and the other under performing and I honestly don't know which is which.

The answer to your question is that the 10.35 ET was under performing relative to the 145 trap speed. Not unreasonable to expect mid-9s ETs with a 145 trap speed on a decent run like TOSTO reported.

[Ruthlesszl1]

Originally Posted by TOSTO RACING

I run a 30x9 radial slick on a 15x10 inch rim no rubbing anywhere been 1.35 60'

Is your car a manual and are you running a Hoosier I see they have that size with the d07 compound I just don’t want something too stiff to where I break stuff