Auto's don't dyno correctly unless you have the TC locked. I had problems with that on my dyno when I first started. You have to lock the TC or you will lose a ton of power. About 10 to 15% on top of normal auto losses.
That's why I loved doing manual's. On a stalled auto that doesn't lock (or turbo car) you have to have a load cell to simulate the weight of the car so you can stall the converter (spool the turbo) properly to get a good reading or you will be way down on power.
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