Wanted to have my Saab dyno’d again to check out a few changes I had made. I went back to the stock fuel pressure regulator and I wanted to see the air fuel ratio under ECU and MBC control. I also wanted to test the water injection system. I had turned off the water injection for a few months and I noticed an increase in low end power. I recently restarted using the water injection and noticed a sever decrease in power, I couldn’t maintain normal boost pressures. I had also switched back to washer fluid from 70% Isopropyl because the alcohol would destroy the rubber seals in the pump.

I did four runs on the dyno with air/fuel for all of them. Because of the direct ignition the rpm sensor for the dyno had problems. The torque above 80 mph, which is 5000 rpm, was not recorded correctly. It looks like something is really wrong but the torque actually falls off smoothly, which is indicated by the flat horsepower curve.

The four runs were as follows.
Run 1 – ECU control no water injection
Run 2 – ECU control no water injection
Run 3 – ECU control with water injection
Run 4 – MBC control no water injection

Wheel horsepower was ~230 for runs 1,2 and 4 and torque was 241 ft-lbs, except for the last run when it spiked to 318 ft-lbs. The dyno was at Xotic Motorsports in Cochranville PA. It was a dyno day for TurboForum.net. The guys at the shop where nice and were actually letting the owners do their own dyno runs. All runs were in 3rd gear.

Stage 3 SQR claims
251 hp, 275 ft-lbs
My Saab with the custom stage 3.5 produces at the wheels.
230 hp, 241 ft-lbs
Now accounting for the 15% drive train loss, which has been proven with stock Saabs.
270 hp and 283 ft-lbs

First & Second Dyno Runs
ECU control no water injection. The ECU was giving a max of 18 psi, which was a little low. I was hoping to be closer to 20 psi but I am still happy with the results I got.