I had baseline dynos done at two locations on my totally stock CS. A Quaife TBD was installed, and the car was dynoed again (no change). The Softronic SRP and software flash were installed, and the car was run for a weekend on the track at a DE using 100 octane gasoline (8 gallons 104 octane race gas at the track, plus 4 gallons 93 octane pump premium).

The car was put on the dyno again at both locations, still with 100 octane fuel.

Results, first shop:





This demonstrates why I had the dyno done at two shops. This shop does fine mechanical work and has a good reputation, but they did not impress me with their dyno work. This dyno showed no change in power with the SRP, flash and 100 octane fuel. Runs 1 and 3 were totally stock, runs 4, 5, and 6 were after TBD install. Runs 7, 8, and 9 were after SRP and DE weekend.

Results, second shop, on Dyno Dynamics rig, using their typical test protocol:





Horsepower increase was 22 hp (240 vs. 218), torque increase was 7 ft-lb (200 vs. 193). All gains were above 4000 RPM, with LOSSES in lower RPM ranges.

Results, second shop, using 6-cylinder shootout mode:





Horsepower gain was 16 hp (245 vs. 229) and max torque was unchanged at 205 ft-lb. Gains were above 5000 RPM, with LOSSES in lower ranges.

Second shop is a very precise, technical speed shop. They do not do Porsche work (no axe to grind, nothing to gain or lose). They do primarily VERY high horsepower Japanese cars, typically with forced induction and nitrous injection.

Comments:
1. This is definitely a TRACK modification. Look at the substantial improvements at 7000 RPM. You can really feel the car pulling strongly all the way to redline. This translated into better lap times, and a difference you could really feel.
2. If you drive on the street, and your enjoyment comes from racing away from stoplights, according to my results you will be SLOWER(*** SEE POST 31 FOR UPDATE ***). Make your decisions according to how you drive and what you enjoy.
3. Even if you dyno your car, you may not be able to tell if you are improving or harming its performance. There is a little sticker on every gas pump, indicating that it has been compared to a recognized standard. That is how you know you really get a gallon of gas. As far as I know, the only certification program for dynos is done by Dyno Dynamics, and that is only in Australia. The ability to compare dyno results is otherwise non-existent, as far as I can tell. Even if you are just trying to use a shop to judge relative improvement, you are at the mercy of their test operators, equipment calibration (or lack thereof) and equipment quality.
4. My car is still choked by the stock exhaust. Capristo is on the way, will install and run for a weekend at the track and then dyno again. Next DE is September, though, so don’t hold your breath…

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....its even SAFETY YELLOW! What could be more practical???