shift parameters for 4L60E
Thread Starter
Teching In
Joined: Sep 2013
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shift parameters for 4L60E I have a 5.3 with a 4L60E trans and the motor runs super but it doesnt have the "pep" it should when your going down the road and get in the gas. I think its in the trans tuning cause it doesnt really downshift even at 100% throttle. So just curious if there are certain percentage of throttle there telling trans to downshift or shift at? Hoping someone can fill me in so i can tall intelligently to the tuning guy. Or are there any good places in Northern Illinois that do this? Thanks
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Joined: Aug 2010
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From: Ann Arbor, MI
Yes, depending upon speed and throttle position the stock tune will obviously downshift.
For example, in the stock 2002 Camaro SS tune:
At 50% throttle it will downshift 3=>2 below 33 mph.
At 100% throttle it will downshift 3=>2 below 86 mph.
If your trans is not downshifting, you should start by using a scanner to confirm that the PCM is ready the throttle position correctly via the TPS.
For example, in the stock 2002 Camaro SS tune:
At 50% throttle it will downshift 3=>2 below 33 mph.
At 100% throttle it will downshift 3=>2 below 86 mph.
If your trans is not downshifting, you should start by using a scanner to confirm that the PCM is ready the throttle position correctly via the TPS.
Thread Starter
Teching In
Joined: Sep 2013
Posts: 16
Likes: 0
OK thanks...I will have the engine tune guy check that...its a 5.3 and 4L60E that i put in a 76 Trans Am. I was just hoping for info so I could ask him smart questions or tell him "these are the parameters i want it set to" kind of thing.
