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...There is one caveat - the cage needs to meet SCCA rules, meaning it needs to be 1.5" x .120" or 1.75"x .095". There are some SPB's out there that are 1.5" x .95" and that is not legal for SCCA...
I recently had a cage built to PCA specs and my builder used 1.75 x .095 DOM for main hoop and 1.5 x .095 for the rest of the cage. The comment above made me wonder if my car would be legal for SCCA so I looked for their rules and found the info in the pic below. I think I would be OK because the main hoop is 1.75. It also seems that 1.5 x .095 would be legal (barely) assuming the car without driver is under 2500 lbs. Am I missing something? Here is a link to SCCA appendix on roll bars: https://dk1xgl0d43mu1.cloudfront.net...pdf?1484693531
Actually this is what I had cross referenced from the latest SCCA GCR when I was typing things out, but as it turns out even this is NOT correct. This is Appendix I for cars logbooked pre-2008 (the confusing part because that is only mentioned in the first sentence):
However upon re-reading, this is the actual tubing size required for 2008+ cars (meaning logbook after 2008, not model year).
I've corrected my original post, but also added some clarification since I know Mike James had an issue with SCCA and it was that his cage was alloy steel, which SCCA does not recognize as different strength (thus size difference) in their ruleset, which PCA does.
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For purposes of determining tubing sizes, the vehicle weight is as raced without driver, fuel and ballast.
One of the few, if not the only, places where the SCCA doesn't include the driver's weight.
A Spec Boxster is around 2450 without driver and fuel, so well within the 1701-2699 range. Therefore, tubing 1.500x.095 or 1.625x.080 is OK.
I had mine built 1.75x.095 anyway. Both PCA and NASA would require that at 2500 without driver (SPB is just 2% shy of that), so I figured be on the safe side.
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This makes the idea of having a spec boxster more appealing. Being able to run both PCA and SCCA is cool. I have heard that a lot of very fast SCCA guys will run a Hoosier A7 instead of the R7 in the sprint race. The autocross tire will get slower right near the end of a short sprint, but will be quick for most of the race and technically it is DOT. A friend, who has won several June Sprints and a Run Off said he ran an A7 tire which was good for about a second a lap over the R7.
Food for thought if you are running a big race like the Runoffs or June Sprints and dealing with a slightly quicker car in class.
Actually this is what I had cross referenced from the latest SCCA GCR when I was typing things out, but as it turns out even this is NOT correct. This is Appendix I for cars logbooked pre-2008 (the confusing part because that is only mentioned in the first sentence):
However upon re-reading, this is the actual tubing size required for 2008+ cars (meaning logbook after 2008, not model year).
I've corrected my original post, but also added some clarification since I know Mike James had an issue with SCCA and it was that his cage was alloy steel, which SCCA does not recognize as different strength (thus size difference) in their ruleset, which PCA does.
Older post, but with the PCA 2022 schedule out, I’m looking for alternative events.
I believe Mike James has./had a TuneRS build, sister car to mine… if so I might have problems with scca unless things have changed.
Good news, should really make the SPB even more competitive in SCCA.
FWIW, I run my SPB in T3 at Summit regularly. Back to back comparison of a 30 or so heat cycle 255RRs, and set of 245.40 R7s with maybe five cycles - Hoosier were worth about .2 to .25/lap. I also run NASA GTS2 and can compete with the the back of the back. Someone with about a second more speed could run with the frontrunners.
08-04-2017, 10:30 AM
