Re: G Tech?
And if you're using the hp feature as they specify in the manual spinning the tires is pretty unlikely, as they specifically state that a run to measure hp is different than a run to measure accelleration, and that you should be in second or third (high enough not to spin your tires).
I think a lot of the inconsistent hp numbers are because people do 0-60 blasts or 1/4 passes and then look at the hp numbers. Hell, run two dynos and your hp numbers will differ, but the point of a dyno isn't usually to measure your actual hp, but to measure the effect of tuning or parts changes, plus or minus from your baseline, and I feel that g-techs are fine for that purpose. Not quite a dyno, but a hell of a lot cheaper.