Race Car Tech Discuss anything related to road racing and auto X.


Old 03-25-10, 02:03 AM
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Maybe I will have here better response...

I have question about racing tires slicks.. Not a semi slicks, only full slicks..

I was search, but everybody use road tires, so no help..

I have FC3s TII, with light mods ( Intake, exhaust ).. Now I have 15" wheels, stock GXL, will this be small wheels to put slicks? I am going to use car only on track and hill climb competition..

What dimension of tires do you use?

What size of wheels?

Any help,

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Old 03-25-10, 07:55 AM
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Here is a tire spec chart for Hoosier racing tires:
The R value R25-R35-R45 and so on is how long the tire lasts. The higher the number is more suited to endurance races.

I see you are posting from Europe. I know that Avon tires are popular over there. You should just go to a race track over there and talk to the drivers about what they are running. You may even be able to stumble on a set of low lap takeoffs for a really good price.

As for sizing.. wider is better as long as you can get them warm fast enough. You can also adjust you rev range with the tire circumference. Obviously smaller the tire faster the revs build and so on.

For the fc a cheap upgrade is some stock FD wheels with some spacers running 245/45/16 Hoosier A6s.
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Old 03-25-10, 08:24 AM
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You can fit Hoosier's 23x8.5 listed under EP or GT on a 7" rim under the stock fenders. Go with the R45 compound, the R35 won't last under your car. They are designed to fit a narrow rim but they are about 10" sidewall to sidewall. 26-28psi hot is your target.
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Old 03-25-10, 09:26 AM
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Thanks for replys.. Yes, I am for europe..

I will check what others drivers run on.. But this will be only one RX-7 on track or hill climbing . There was long time ago, one FD for circuit racing..

GXL wheels are 15x6 ? So i was thinking to put slick on that wheels + 20mm spacers ( rules ).. Will be that good ?

Nobody have here FD wheels..

What will be good dimension setup wheels / tires for fc3s, stock TII, coilovers etc..?

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Old 03-25-10, 01:31 PM
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one of our fun cars is an 87 gxl, with full suspension and Ra1's it can't break traction in any direction! its very weird to go around infineon without lifting except to set the car for turns. its still slow too...

in the states most of us are running an Improved Touring class. the rules put us on 225/45/15 tires on a 15x7" wheel.
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Old 03-25-10, 02:59 PM
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Goodyear also has slicks for that fitment, if you can get those there. It is a very common tire for use under 1st gen EP cars. Several compounds available.

http://www.racegoodyear.com/tires/sports.html click the sports car tab at the top to get off the dot page.
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Old 03-26-10, 07:54 AM
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The Hoosiers and Goodyear bias ply slicks made for those narrow wheels are very good tires. I used to run those on the front of my lighter 1st gen road racer. For a car as heavy as yours, you want the R430 Goodyear or R45 Hoosier compound for a track day. For a short hill climb, you would want one of the softer compounds, if you can afford a second set of slicks and wheels.
Those above mentioned tires that are made for narrow wheels like yours are called canti-lever slicks, because the tire side wall has to bulge way out. The wide sidewall section width can rub against the front coil springs if you are running coilover springs like most people do, so you will probably have to run spacers like you mentioned. These bias ply slicks don't need as much negative camber as radial race tires do. About 2 deg negative was plenty of camber. These bia ply slicks also operate at much higher slip angles than the radials do, and they give much more warning before break-away than radials do. They are a LOT of fun to drive at the high slip angles.
I tried one set of Avon 15" slicks on my car, but the set of Avons I bought were better suited to a light weight formula car or sports racer. My soft compound Avons were good for about 3 laps, then they got greasy. My car is probably 500 to 600 pounds lighter than yours, so make sure you buy a hard compound slick if you are going to be running several laps like a normal track day.
Life of these slicks is usually about 100 miles because they are designed for short sprints typical in club racing. They usually go bad before all the tread is gone; you will feel them go away when they start feeling slilppery on the track and they are no longer sticky to the touch when you come in hot off the track.
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Old 03-26-10, 04:30 PM
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Originally Posted by Gaber View Post
What will be good dimension setup wheels / tires for fc3s, stock TII, coilovers etc..?

I run 245/40/17 up front and 275/40/17 in the rear Hoosier A6s. They are very tight on both sides..

my wheels are 17x8 +30s up front and 17x10 +35s in the rear.

A6s are auto-x tires, and not really for the track, but I thought the sizes might help even though most racing tires are measured differently...
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