Disappointing Dyno (Stock 05 GTO)
Just got my first dyno on a dynojet for a baseline run with 3200 miles on the clock. Pretty disappointed, got 329 max HP and 324 max TQ on two back to back runs. The third was worse, but by that time the motor was pretty heat soaked. Ambient temp was 95 degrees, and it was running pretty rich above 5000 rpm, but I still think the numbers are on the low side. The guys at the dyno shop said they had dynoed three other GTOs and all were in the 340 range, but during cooler temps. Since I have owned the car, I knew it was not a factory freak and it has kind of felt down on power since I started playing a little. Did the proper 500 mile break in and even changed the oil at the 1000 mile point and then again at 3000. Changed the plugs awhile back and the plug in the left bank (driver side) cylinder just one up from the firewall keeps getting the porcelain black after only a week. All other cylinder's plugs are crystal clear so I may have a problem with either an injector or possibly a ring that never got seated. I'll post the graph as soon as I can get it scanned. I think I'll take it to the dealer and have them scan the computer and investigate the one cylinder.
05 GTO MN6 (Blk/Blk), NGK TR55IXs, more coming...