Although I’m new here, I’m not new to Audis and I have owned a dozen of them over the years. I am looking for some solid information as to how much power an AVK engine can make with only minor mods to the intake and exhaust systems, plus a retuned ECU, and by all evidence, this seems to be the place to ask.
Back in 2007, I ran my '04 USP at a half-dozen local events in the SCCA’s G-Stock class and did quite well with it. Times have changed, however, and since I have time on my hands and plan to keep the car for a few more years, I’m in the process of going through it to refresh the suspension, brakes, etc., which opens the door to using higher-performance, non-stock parts for not too much more money.
As such, I’m considering preparing it to compete in the SCCA’s STX class, which allows ECUs to be retuned, intakes ahead of the throttle body to be replaced or modified, and exhausts to be replaced or modified (so long as a catalytic converter is installed within 6" of the exit of the last OEM cat.) See Rule 14.10, starting at p. 85, for more details of what mods are allowed: http://scca.cdn.racersites.com/prod/assets/2014%20Solo%20Rules%20Book%201%20draft%20a%20reduced.pdf
Assuming that I take full advantage of these mod allowances, how much power and torque am I likely to see? (I would love to install a lightweight flywheel, too, but that’s not a legal mod for this class.)
I figure I can get the car’s weight down to ~3275-ish in STX legal trim using parts I already have on hand and although I will be limited to 8" wide wheels and 245mm wide tires, I believe that if I can get a 3.2L level of power (or close to it) out of a legally modified 3.0 engine and do a decent job of setting up the suspension, the car should be reasonably competitive locally and perhaps even regionally. (Of course, it won’t have a chance at the national level – unless it rains! – but as I have no plans to compete with it nationally, that’s not a big deal.)
If it can’t make that sort of power (and my gut feel is that ~240hp / ~240ft/lbs of torque are the most likely answers to my question), then I think I’ll run it in G-Street instead, as I’m probably better off saving the extra money I would spend prepping the car beyond OEM specs and putting that toward my Cayman’s engine rebuild instead (unfortunately, I blew the engine at the track back in November and as I’m presently unemployed, I am reluctant to spend too much money on “toys” just now.)
In any event, thanks for any input you folks here can offer me (even if it’s not what I want to hear!)
And for the curious, here’s a photo of my car with the set of 19" autocross wheels from my Cayman mounted on it via 42 draft adapters. Believe it or not, but this wheel/tire combo is slightly lighter than the 18" OZ Alleggerita wheel/tire combo I’ll be competing with on my Audi and IMO, it looks better too!