Quote:
Originally Posted by Topless
It all sounds good on paper Shad but in 7 years of looking I have seen very few examples of success with this. None were inexpensive. The best example was a few years ago when a guy had quality headers, racing exhaust, well thought-out custom one-off intake, larger TB, plenum, ported intake runners, and a custom dyno tune to make the most out of his changes. He did find about 25 hp at 6500rpm but it cost him $6k to get it done and the torque curve was significantly narrowed. Lap times after all this... no measurable improvement. He gained paper hp but sacrificed a broad torque curve and driveability in the process. The car was also no longer street legal.
Ultimately it is your car and your dough so if you think you can find the magic bullet here, have a go and let us all know how it turns out. A cool dyno slip doesn't really interest me. Until I actually see a car turning faster laps by making these changes, I'll be on the sidelines. Compare this to dropping in a 3.4L, the difference in performance is instant and measurable in significant improvement in lap times.  |
I hear you, improperly done mods typically decrease performance. I'm not saying there is a magic bullet. What I'm saying is there must be a reason that that the 996 make 10 more HP per liter, or 20% more HP for 6.25% more displacement. IIRC, the heads are the same and the cams are the same. The CR is almost the same 11.3 to 11.1. That leaves the engine management, exhaust and intake as possible choke points. It's not magic, it's physics. what one can do the other ought to be able to closely match in scale. IF Porsche had built the 3.2 to the same level as the 3.4, we'd be complaining that the 3.2 only has 275-280HP.
6K for 25hp? OK, a 3.4 buys you 50HP over an S, what's that cost? It would likely make 6K easily palatable.
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