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tranny downshifting on dyno

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Old May 6, 2006 | 02:51 PM
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Default tranny downshifting on dyno

i did a search and didn't find anything.i dyno'd today and my tranny kept downshifting into 2nd. gear at about 5000rpms.it wouldn't stay in third.car has a MW3000 stall TQ.it seemed like the guy doinng the run was rollling into the throttle,but i wasn't watching the computer when he did the runs.or is this a common problem with some higher stall TQs?it runs fine on the street,doesn't slip when shifting.or maybe the shift settings aren't right?
anybody have a similar experience?
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Old May 6, 2006 | 03:00 PM
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normal thats why most of the smarter dyno shops will use software to lock the car in a specific gear & then lock the converter.
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Old May 6, 2006 | 03:14 PM
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Originally Posted by foff667
normal thats why most of the smarter dyno shops will use software to lock the car in a specific gear & then lock the converter.
that makes sense.the shop is actually geared to mustangs/fords(they had an open dyno day) and the owner asked me if that was normal,he didn't have any experience with GM trannys.thanks for the quick reply.
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Old May 6, 2006 | 03:19 PM
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and the funny thing was i topped out at 354rwhp before it downshifted,which most of the mustang guys thought was pretty strong.i thought it was a little low,lol.even some of the mustangs on spray were only 25-35rwhp more than me.
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