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305/680/18 Square setup

Old 01-20-2019, 01:16 PM
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Turbo?
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Default 305/680/18 Square setup

Hello friends and fellow enthusiasts,

I am going to be doing the setup in the title, here are some pics. Wheels are 18x10.5 +20. With no spacer the tire are contacting here


With the 15mm spacers hopefully everything should clear.

Just hoping I dont need to start cutting things too drastically.






Last edited by Turbo?; 01-20-2019 at 01:17 PM.
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Old 01-20-2019, 03:33 PM
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Welcome- I hope you realize those Continental racing tires are not suitable for the street. If your G is a track-only car, you'll have plenty of development to get those race tires to function properly.
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Old 01-20-2019, 05:26 PM
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In addition, it’s no wonder why they’re rubbing.... they are, at minimum, a whole inch taller than the tallest street size tire you should be running (lest you kill your rear gear advantage with these truck height tires).

Your better bet would be 305/640-18 if such exists.

How’d you decide on 680s to begin with?
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Old 01-20-2019, 06:19 PM
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Originally Posted by MicVelo View Post
In addition, it’s no wonder why they’re rubbing.... they are, at minimum, a whole inch taller than the tallest street size tire you should be running (lest you kill your rear gear advantage with these truck height tires).

Your better bet would be 305/640-18 if such exists.

How’d you decide on 680s to begin with?
They are 100 a pop new, i want the taller gear for autox so i can stay in 2nd. I'll update once i get further along

Last edited by Turbo?; 01-20-2019 at 06:21 PM.
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Old 01-20-2019, 06:23 PM
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Originally Posted by dkmura View Post
Welcome- I hope you realize those Continental racing tires are not suitable for the street. If your G is a track-only car, you'll have plenty of development to get those race tires to function properly.
Track set of tires... I am going to put on the hotchkis swaybay, guessing all the way stiff. play with disconnecting the rear, then perhaps coilovers

Last edited by Turbo?; 01-20-2019 at 07:57 PM. Reason: to elaborate
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Old 01-20-2019, 06:49 PM
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Here's a vid of me on the current 245 19 sumitumo htrzIII's


Enjoy
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Old 01-20-2019, 08:16 PM
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Originally Posted by Turbo? View Post
Track set of tires... I am going to put on the hotchkis swaybay, guessing all the way stiff. play with disconnecting the rear, then perhaps coilovers
OK- so you have a separate set of tires to take to and from the autocross site? And have you ever driven on a set of race tires? Otherwise, depending on compound, those tires car be slick as **** until they get some heat into them. Not sure how you're going to warm them up in the limited runs solo competition mandates.
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Old 01-21-2019, 03:53 AM
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Originally Posted by dkmura View Post
OK- so you have a separate set of tires to take to and from the autocross site? And have you ever driven on a set of race tires? Otherwise, depending on compound, those tires car be slick as **** until they get some heat into them. Not sure how you're going to warm them up in the limited runs solo competition mandates.
The compound is between A7 / R7 in softness will need some warming up but luckily im in FL and should have no issues on 80+ degree days. Yes I've driven on slicks many times, yes I have street tires for street driving as you can see in the video above.

What coilovers are popular for the trackday crowd?
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Old 01-21-2019, 09:13 AM
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Rears, looking decent will see how bad it rubs in cornering



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Old 01-21-2019, 10:01 AM
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For SCCA racing, I use Koni 2812s with Eibach race springs. What class do you run an otherwise stock car on race slicks?
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Old 01-21-2019, 10:32 AM
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Originally Posted by dkmura View Post
For SCCA racing, I use Koni 2812s with Eibach race springs. What class do you run an otherwise stock car on race slicks?
I think we both know it's not a classed car I just run with a vette club and wanting to keep up with fast guys as cheaply as possible
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Old 01-21-2019, 03:32 PM
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Originally Posted by Turbo? View Post
I think we both know it's not a classed car I just run with a vette club and wanting to keep up with fast guys as cheaply as possible
I have no way of knowing what kind of class you're running in. We have everybody from experienced SCCA National solo competitors on here to those who have very little practical experience. I try to provide a little help to everyone I can and was the reason I asked that question in the first place. Glad you could get some cheap race tires, but it's difficult to suggest how to optimize their use.
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Old 01-22-2019, 07:34 AM
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Originally Posted by dkmura View Post
I have no way of knowing what kind of class you're running in. We have everybody from experienced SCCA National solo competitors on here to those who have very little practical experience. I try to provide a little help to everyone I can and was the reason I asked that question in the first place. Glad you could get some cheap race tires, but it's difficult to suggest how to optimize their use.
Are you guys using 265's? What kind of spring rates?

Thanks again I appreciate the info!
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Old 01-22-2019, 09:17 AM
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In road racing, we're often constrained by the rules. In SCCA Touring 3, Z33s must run a 245 profile tire and 700# max springs. My HR is also mandated to run 37 mm restrictors and weight 3275# for 2019. I've played with spring rates and swaybar settings and will sometimes go to other specs (T1) when I get frustrated with the rules.
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Old 01-22-2019, 10:15 AM
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Id get some arp lugs to be on the safe side. Autox is probably fine, but on track id run a different wheel and get rid of the spacers.
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