First Dyno Run Stock G8 GT 87 Octane
OK, normally this is a computer programming related blog, but I have a weak spot for V8-powered muscle cars. In this case, our family sedan, with which I have a complicated love/hate relationship.
If you are one of my prius-driving friends (Lance, Paul, I'm looking at you!) you can safely ignore the rest of this post and pass judgement. If you are one of my carbon-spewing muscle car driving friends (James? David? Are you Listening?), read on for the goodness.
On a whim I drove out to St. Charles County to a place called Midcoast performance. First, the stats:
2009 Pontaic G8 GT
87 Octane
Mustang Dynamometer 1100-SE Chassis Dyno
SAE Corrected
Peak Power (hp) 309@5400rpm
Peak Torque (lb*ft) 335@3600rpm
This was a hot, humid day, but SAE corrects for that. This was the third pull, after the first two had some erratic results so I discarded them. The numbers were all jittery and the torque said like 2300. This was primarily a Ford-centric shop (ford outnumbered all others in the shop 5:1) and the dyno operator said "the dyno doesn't like GM LS engines".
By the third pull the engine was hot so 309 was all she would do. One of the first two runs said 319 peak but like I said they were erratic so I'm throwing it out. I'll stick with what I can document.
We were hooked to a wide band oxygen sensor and he was able to observe that the PCM was pulling up to 7 degrees of timing up top because of KR.
87 Octane
Mustang Dynamometer 1100-SE Chassis Dyno
SAE Corrected
Peak Power (hp) 309@5400rpm
Peak Torque (lb*ft) 335@3600rpm
This was a hot, humid day, but SAE corrects for that. This was the third pull, after the first two had some erratic results so I discarded them. The numbers were all jittery and the torque said like 2300. This was primarily a Ford-centric shop (ford outnumbered all others in the shop 5:1) and the dyno operator said "the dyno doesn't like GM LS engines".
By the third pull the engine was hot so 309 was all she would do. One of the first two runs said 319 peak but like I said they were erratic so I'm throwing it out. I'll stick with what I can document.
We were hooked to a wide band oxygen sensor and he was able to observe that the PCM was pulling up to 7 degrees of timing up top because of KR.
See attachment with my notes in red.

