ITA CRX: Tires

[280ZX3]

My race team is going to be running two '91 ITA CRXs next year and we've decided to make the jump from 14x6s to 15x7s. We're currently running 205/55/14 Kumho V710s on the 14s. We're kind of on a budget and looking to get the most bang for the buck.

We would run 225/45/15 V710s, but Kumho doesn't make that size. Hoosier, Toyo, and Nitto do.

The problems as I see them:

Kumho- Can only run Kumhos in 205/50/15s. 20 mm of tread seems like a lot to give up.
Hoosier- $217 a piece. $50 more per tire than other tires in its class. They also don't last as long, but are probably the fastest.
Nitto NT-01 - Are they as fast as V710s? Looks like they probably should be shaved.
Toyo R888 - Same problem as Nittos.

Can anyone give us any suggestions? If anyone has made the jump from 205s to 225s on an ITA Honda, I'd be interested to see how much of a difference it actually made in lap times.

By the way, we're not opposed to the 14x7 option either, but I'm having a really hard time finding any 14x7 Honda rims.

[joeg]

Seem if you are on a "budget" why change to a more expensive size?

If you are not strictly budgeted and you really want to see what the car can do--GO HOOSIER!!

[mc-integra111]

We would run 225/45/15 V710s, but Kumho doesn't make that size. Hoosier, Toyo, and Nitto do.

So either run the 225/50R14 V710's or pick a different final gear and run the 225/50R15's. I actually run both of these sizes to purposely change my effective final gear.

If anyone has made the jump from 205s to 225s on an ITA Honda, I'd be interested to see how much of a difference it actually made in lap times.

Not that much. I'd say I only gained a couple tenths or so (205 on 6" wide to a 225 on 7" wide). I do not have data to back that up as other change were made to a larger overall improvement, so that is just my best guess. Plus, I am not convinced I have the most correct setup yet, so take this for what it's worth.

By the way, we're not opposed to the 14x7 option either, but I'm having a really hard time finding any 14x7 Honda rims.

Try Team Dynamics. I use the ProRace 1.2.

[280ZX3]

Not that much. I'd say I only gained a couple tenths or so (205 on 6" wide to a 225 on 7" wide). I do not have data to back that up as other change were made to a larger overall improvement, so that is just my best guess. Plus, I am not convinced I have the most correct setup yet, so take this for what it's worth.

I'm surprised. I thought it would have been a substantial increase. Perhaps the money would be better spent developing other areas of the car.

[mc-integra111]

I'm surprised.

I was too. I know a guy (preps 2 CRX's) who swears they aren't worth anything (well, not enough grip to overcome extra rotating mass and rolling resistance) and still runs 205's.

My suggestion would be to keep running 205's on 6" until you get to a point where you want to go out and try to win each weekend. At that point, the small amount of extra grip is worth whatever it costs.

[280ZX3]

I was too. I know a guy (preps 2 CRX's) who swears they aren't worth anything (well, not enough grip to overcome extra rotating mass and rolling resistance) and still runs 205's.

My suggestion would be to keep running 205's on 6" until you get to a point where you want to go out and try to win each weekend. At that point, the small amount of extra grip is worth whatever it costs.

Interesting. Thanks for the info.

By the way, we'll probably see you next year at a MCSCC event. We run the black/yellow #39 ITA CRX (Bryan Leslie W2W's it) and now we've added the white/blue #36 ITA CRX that used to belong to Donny Kovar. It will be fun having two of our W2W drivers in the same class.

[mc-integra111]

I was wondering. I was talking with Doc about wheels for the CRX at the last Autobahn race when you guys were looking at Kovar's car.

Look forward to seeing you guys out next year.

[Steam Corners]

By the way, we're not opposed to the 14x7 option either, but I'm having a really hard time finding any 14x7 Honda rims.

I think I saw a 14x7 Enkei RPF-1 in the most recent Tire Rack ad in Grassroots. . I'm having issues finding pricing on their site right now, however. . .