Got to dyno a bone stock Pontiac G8 today. Nice car. Boy does GM cover their back-sides with all the timing reduction for temperature in coolant and IAT. Also very rich mixture.
Spent lots of time working on the tune since this customer would only run 87 octane. The results were very positive.
Baseline numbers were 279 rwhp, 299 rwtq
Tuned numbers were 313 rwhp, 328 rwtq
Because this tune was done on a Mustang dyno, we were also able to run the G8 on a 1/4 simulation.
Stock 1/4 mile dyno run: 13.44 @ 104 mph
Tuned 1/4 mile dyno run: 12.81 @ 109 mph
Tuned 1/4 mile dyno run with torque management removed: 12.49 @ 111 mph
Don't know how accurate the 1/4 mile dyno runs will be compared to the track, but a 13.44 @ 104 mph is not too far off of what stock G8s seem to be running. The owner plans on taking the car to the track soon so we'll have some real world results to back these up. Gotta love technology. We dropped nearly a second ET and we didn't have to turn a wrench.
I also made the AFM much more aggressive so the motor will cruise in 4 cylinder mode all the time cruising down the highway. I know this was good for a 2-3 mpg gain on my Suburban. I would expect similar gains on the G8. In this day of nearly $4 per gallon fuel, it's nice to gain over 30 rwhp and increase fuel economy at the same time.