A track will definately be more inconsistent. A dyno guy should be able to duplicate numbers on a car in similar conditions. Neither is the be all and end all as to what the car can/can't do, but combined they tell you what the the combo/driver can do on a certain day/dyno.
How bout this example:
Take two cars that weigh the same exact amount. They have the same exact powertrain. One car has stock suspension with no chassis stiffening. the other car has a full drag specific suspension with chassis work. The stock suspension car will likely have a slower ET but higher trap speed. Does this mean it has more power?!!?!?!
And to further that example...
Since the ET of the full-suspension car is so much greater (up to 1 second), does this mean that the ET car is putting out more power?
No, because the TRAP SPEED is what you use to calculate power, not the E.T. Traction does play a part in trap speed, but not a monsterous part. Regardless, you can look at a timeslip and SEE the differences though. With a dyno, you are basically forced to make assumptions. There are definitely more variables at a track. Altitude is something that can be corrected for.........wind for example cannot. I still think a timeslip shows you more than a dyno will. How do you account for variability between dynos? Some dynos are very accurate, some are not.
You're telling me that you'd believe someone who claims to have made 260 rwhp with a stock 5.0 motored AOD car on the dyno just because it was dyno'd, and don't think that a timeslip might be a better teller of the story?
5spd GT... just how many cars have you dynoed?
How many engines have you dynoed, then had chassis dynoed?
Using the almost worthless dyno numbers, how many times have you ran your trap speed what the dyno hp numbers indicate?
Dynamometers are good for tuning, to be used as a tool. Interestingly enough, you can instantly realize if the dyno lied to you after your first few trips to the track.
IF you want to get into this with more depth and experience than I have to offer, come on over to the "tech" board. We will be happy to go over it.
Example:
A an older friend of mine dyno'd 522 RWHP in his '03 zo6 (Procharged). I never dyno'd my '93 (roughly 290-300 RWHP), and race weight was very close between the two rides.
He was running just 3-4 MPH faster than me. Why?
He was not the best driver.
It's what the laws of physics dictate, not the laws of the dyno
Have any of his timeslips? He either wasn't making 522 RWHP, or was the worst driver known to mankind, taking a second at a time between 3,000 rpm shifts. That example goes a little beyond mild driver error IMO. Even an average driver should have that car trapping in the 120-125 mph range. It's what the laws of physics dictate, not the laws of the dyno
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