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I used both and do not recall much difference but we used a load dyno for tuning. I used 4th gear on my G50/50. Gear choice can make some difference if it blows through the run to fast or to slow.
Air temp makes a difference.
Nothing beats what we have now.
If one is going to use acceleration data to rolling start in a gear is going to take some of the technique out of it. 930's are quite sensitive to launch technique.
Any testing is better than the butt-dyno.
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