Getting closer to getting the Porsche 928 SCCA classified as T1
#1
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Getting closer to getting the Porsche 928 SCCA classified as T1
Ive been working on this during the off season and looks like we are making progress. soon, the Porsche 928 will be part of the SCCA Touring 1 class. I need the exact Throttle body diameter specification.. isn't it 88.9mm or something close to 3.5"?
thanks,
mark
thanks,
mark
#4
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Good luck on this Mark!!! There are some measurements of an S4 throttle body here: http://www.928sg.com/intake.htm
Thanks Mark for continuing to carry the 928 racing banner, you're one of a very precious few.
#5
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#7
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Good luck on this Mark!!! There are some measurements of an S4 throttle body here: http://www.928sg.com/intake.htm
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#8
I have pics and info on my site showing the big bore at 78mm but a typo on the page showing 79
#9
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so, its really 74mm and you bored it out 4mm as it showed on the pics (etched on the TB plate). interesting that the 85-86 has the bigger throttle body. we should probably list that as it is a stock component and you should be able to use different components interchangeably. anyone know what the 85 TB is in diameter? I'm thinking its at least the same as the euro 2 valve which is 3.3" at the throttle plate, which is 84mm.
#10
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The goal was and always has been to find a class the 928 can compete in , on a national level and stage . I hope some take advantage of it!!!! T1 is a class where the 928 can flourish. im thinking a 928GTS bottom end, possibly the dual throttle body intake, and a hot cam. should be able to get in the 400 rwhp level while keeping the RPM in the 6600 rpm safe range.
#12
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Good work on getting the car classed, now that it it has a class the question is will it be competitive in the class? what other cars are in T1? I'll come down and run a race or two if there is a chance of having some one to race with.
#13
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T1 is pretty loaded and the cars you would run against are the newer Mustangs with the 440hp engines, caymanS Porsche 997, viper, corvette , NSX, camaro, and many others. the NSX was a little bit of a cheater car, but the cars in the bulk of the group were not too far off my times at Sonoma. I think I would stack up a little better at Laguna due to the track and the 928 characteristics. either way, a well driven 928 should be a top 3 car at any regional race, and top 10 at the national level. Ironically, the reason I got a top 10 finish , was due to the reliability of the 928...… funny, right?
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Car 51 currently makes 275 hp and 300 tq I could get it to 300/300 with some proper tuning but it's never going to make 400 hp which is what it would need to compete in T1.
Congratulations once again on the 10th place at nationals. That was great to watch
Congratulations once again on the 10th place at nationals. That was great to watch
#15
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As far as the 928, yes, its pretty exciting to me that it is now nationally recognized and now anyone can run in this class. sure, you wont be able to run with the national front runners, but the idea of the class (fundamentally, but not actually) is to have production based cars with limited modifications. so you see Maseratis , Ferraris, corvettes, all with limited mods , DOTs and with your car, you will be right in the action with a lot of them at any local club SCCA event. AND, more importantly, you can go to any SCCA Majors event, (Super Tour events) which is pretty exciting as well. running a car below the T1 (Touring 1) spec is not uncommon. a few of the guys on the racing board have been doing this for years . I think we need to find you an S4 to pump up!