Scott, you are correct in your explination of the gear ratio etc, on our dyno we read timing from the crank pulley w an optical sensor, we mark your pulley w a reflective strip that the optical picks up as the pulley spins.
As far as the high reno wrx readings we have been getting,
I did some more testing on deans car today, the car has been pulled in and out of the shop 5-6 times since the dyno day, but not driven any longer than that, then onto the dyno early this afternoon when I began testing. What I found was it looks as if the cars were knocking slightly on the dyno saturday night, as the timing was being pulled on deans car as soon as I put it on the dyno, but this does show how the wrx ecu learns.
First run: ecu pulling timing like mad
154 hp
159 tq
Second run: ecu started adding timing again at this point
157 hp
163 tq
Third run: still adding
159 hp
163 tq
Fourth run: still adding , getting close to knock though
161 hp
167 tq
Fifth run: added as much as it could, car was starting to knock slightly, adv. mulitplier was very low.
162 hp
168 tq
Sixth run: The ecu was now pulling timing back to get out of knock
158 hp
162 tq
Seventh run: ecu stable
160 hp
165 tq
I made a couple runs after this, all stayed the same, hp/tq figures were within fractions of the previous run.
hope this helps! I know it was an interesting experiment for me.
-Nate
S-Squared
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