Super Touring Rules

[Ron Earp]

So scanning through the rules it appears STU is limited to 3L and six cylinders. However, I see turbocharging is allowed and that engine swaps are allowed, i.e., Acura in a Honda, or one Ford motor into another Ford.

Based on that it looks like it'd be possible to use a say 1998 Mustang (which meets the year requirements) and then put a 2.3L turbocharged Ford Mustang engine (OEM in the SVO Mustang and drops right in) into the chassis, run a 37mm restrictor and have a spec weight of 2770 lbs.

Question from a curiosity standpoint - why is turbocharging allowed but supercharging is disallowed?

[CRallo]

That would be pretty sweet! I always liked those SVO's

That is a good question... I too would like to know that as well! Now that you mention it, I'm quite curious.

[Greg Amy]

...it'd be possible to use a say 1998 Mustang (which meets the year requirements) and then put a 2.3L turbocharged Ford Mustang engine...

Note that as of the June(?) Fastrack we also put in a year limit on the engines. This was in response to some guy requesting to basically build an STU 1979 Porsche Turbo using a newer chassis.

So, I don't know if Ford has the 2.3t that late? If so, then yep you can do that.

Question from a curiosity standpoint - why is turbocharging allowed but supercharging is disallowed?

Because turbocharging is a known quantity, supercharging is not. SCCA has charts that say "with this restrictor size you're pretty much limited to that horsepower." We do allow supercharging on a case-by-case basis (see alternate vehicle table) and we tend to put them in intentionally high. If someone takes the time to build one up properly, and provide dyno charts to us, then based on that info I'm confident we'd consider adjustments (that's my opinion, anyway). - GA

[shwah]

The turbo coupe t-bird might hit an eligible year....

[Ron Earp]

The turbo coupe t-bird might hit an eligible year....

Too "old". Last year was 88, last SVO in the Rustang was 86. Not sure I care too much for that engine year rule. No supercharging knocks out the blown 3.8L from the Tbird SC that ran from 89-96.

[Matt93SE]

Not sure I care too much for that engine year rule.

the point is to keep "modern" drivetrains in "modern" cars.

[mustanghammer]

Too "old". Last year was 88, last SVO in the Rustang was 86. Not sure I care too much for that engine year rule. No supercharging knocks out the blown 3.8L from the Tbird SC that ran from 89-96.

The cutoff year is 1985 for Chassis and Engines. So both of those options would work. So not too old based on the rule book.

[Greg Amy]

No supercharging knocks out the blown 3.8L from the Tbird SC that ran from 89-96.

9.1.4.G.17:
"Supercharged cars may be approved on a case-by-case
basis. Contact the Club Racing Technical Office for details."

In fact, we've approved the Chevy Cobalt SC, Loti Exige and Elise SC, Mini Cooper SC, and even Scion TC with the TRD supercharger kit...all with stock camshaft lifts...but I do suggest it would be a long row to hoe to approve a supercharged 3.8L V6 into STU; that smells a lot more like STO.