Wind resistance and weight have absolutely nothing do to with engine performance.
You could have a Jeep with a 5.0HO drivetrain, then take a Mustang with the same drivetrain and they will dyno exactly the same. If they don't, your dyno is a pile of junk.
As far as tuning, a dynojet can tune just fine. When a dyno "tune" is made on a dynojet it's simple. You make runs in different gears. Say 3rd, and 4th gear. By looking at the performance the car is making over both runs, you can determine whether or not the engine is running rich/lean, and an exhuast gas analyzer will do the rest. Holding a car at a certain rpm at WOT will HURT your true tuning. That will NEVER happen in a real race situation and it will skew the numbers. Having the most safely available hp at any given rpm is what you're trying to get, regardless of the dyno you are using.
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