Excellent discussion, I'm glad to read that GPS devices are growing on you guys. We (NASA) have every desire to keep learning and developing the software we use with these. It isnt going to happen overnight, and it may be that they can never replace the dyno. Maybe, we'll see. Right now we are not at a point where we can use them "instead of", rather as an indication of who should be looked at closer.
Dont take my post earlier in this thread as being an official position, I meant (and stated) that it was a counter point to further discussion. I dont know what the best answer is regarding verifying someone that breaks out at a regional event. I know at Nationals the dyno is the dyno because everyone has the opportunity to baseline ahead of time.
I do know this: if someone breaks out on a dyno the officials must make every effort to ensure the readings are good. Unstrap the car, roll off, realign, and strap it down again. Follow the procedure step by step to make sure all variables (tire pressure, SAE correction, smoothing, weather readings) are all where they should be.
As far as the concept that dynos are not to be relied upon that seems to be stemming from that article...take a closer look at it. None of the runs made would be valid per our rules: only two shops used a dynojet and neither of those had the correct correction factor and smoothing, pressures werent verified, water temps werent verified, etc. In spite of that the average of three runs at each of the dynojet shops (including the run that was high due to a visible spike) were 657 and 652. Thats a difference of less than 1%. Forget the readings from other machines, its not apples to apples.
Now, experience has shown that variance from one shop to another even when everything is right is not always that small, but its certainly nowhere near 15hp on a 260hp car (which would be almost 6%).
Oh, and Liebbe IS a cheating bastard and deserved to get caught! :lol: :wink:
