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I am going to do the same thing this weekend if I have time. I have a guy that swears leaving the converter unlocked will be worth 2-3 tenths. I was going to try completely unlocked and locking it just past the 1/8th at 98mph or so for the last bit of 4th and all of 5th. I am after E.T. right now so I am not very concerned about MPH. 11.50's on stock tires or bust.
I think 3,500-3,800 is a perfect stall rpm for the power band of these cars. I am wondering if the stock re-stalled converter will give you the same type of tq multiplication of a dedicated aftermarket converter. The stocker must be plenty strong if they are locking it from first on and through the shifts. Especially considering this same trans and converter are in the C7Z's.
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