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I basically posted this in the 1/4mile thread, but figure it may help win your FD swap question. This is using the gps device dragy, I have compared it to video runs and it seems to be consistently .1-.2 seconds slower (delayed). All in all seems pretty accurate.
57 degrees, 92octane, no weight reduction 1/3rd tank gas, with a 2500rpm launch with an auto. First 1/8th was flat, second 1/8th was slight incline.
ET on 1/8th 74.98 and ET 1/4th 92.89, 60ft 2.35seconds (I’ve heard/seen dragy is really accurate but not for 60ft times)
Grimmspeed intake, BPB, ace 250, header back, 4th e-tune revision, 4.556 fd swap. auto shifts to 3rd at about 54, and 4th at about 83, so not “optimized” for 0-60 / 1/4mile. But still at least .3 sec faster in both vs 4.1 fd which didn’t require that extra shift.
Purely on feel it pulls harder, and before in the auto it still pulled hard to top of 3rd about 92mph, then shift to 4th and fall on its face. Now it pulls hard all the way in forth to 114, before falling on its face in 5th.
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