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Author Topic: tire shopping need help class car and tire permitted  (Read 5542 times)
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« on: October 17, 2015, 08:10:17 AM »

1981 Corvette
Stock body
6pt cage
Aftermarket  , heads , intake, cam,carb
Upper A arms
All moog front joints and bushings
Koni shocks
373 gears
Factory gymkhana Suspension
Full interior
Currently on factory wheels and BFG T/A 255/60 15
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« Reply #1 on: October 17, 2015, 09:55:27 AM »

Gene knows the more modified classes better than I do, but I think SSM is the right class. There is a minimum required weight, but given that you have a full interior, etc., I don't think you would have a problem meeting it.

Here is the weight rule.

Minimum Weight Calculations (without driver): FWD: 1350 lbs. + 125 lbs. per liter
RWD: 1600 lbs. + 200 lbs. per liter
AWD: 1600 lbs. + 300 lbs. per liter
Supercharged or Turbocharged SSM engines: Add 1.4L to the actual displacement.
Rear wheel weight greater than 51%: +25 lbs. per liter
Tire width 275 mm or less (all): -200 lbs.
Regardless of the weight formulas above, no car will be required to weigh more than 2900 lbs.

Wheel and tire size in this class are unlimited. I think you have to run a DOT legal tire, which for most people means Hoosier A7s.

All of this is subject to check by Gene.


David Ogburn
'15 Cayman GTS
'11 911 GT3 RS
'06 F430
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« Reply #2 on: October 17, 2015, 01:54:39 PM »

SSM looks good, but the best thing to do is go through the SM rules and look for anything that might keep you out of the class. Remember that SM (and SSM) builds on less modified classes so follow through the classes listed as pertaining to SSM.
The SCCA site has the current rules.

Gene Cooley
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« Reply #3 on: October 18, 2015, 07:17:20 AM »

Without "R" compounds, is there a CAM based class for that car? I haven't looked, yet.

"You can't make a racehorse out of a pig,

    But you CAN make a pretty fast pig"
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« Reply #4 on: October 18, 2015, 05:05:49 PM »

Looks like its fine in CAM.  I'm not sure the club does the supplemental classes, but it would fit under CAM-S.

Wheels and tires are unlimited so long as the tires are 200 tread wear or greater.  BFG Rival-S and Bridgestone RE-71R have proven to be the best 200 tw tires this year.  I've heard wider sizes are coming, but don't have any details.

Joseph Banks
92 STX 06 RX8
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« Reply #5 on: October 19, 2015, 07:03:29 PM »

That should be a CAM car just run it with the Rivals or Bridgestones and have an interior.

If you can leave two black stripes from the exit of one corner to the braking zone of the next, you have enough horsepower. Mark Donohue
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