Can a 4L80E run without a computer?
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Can a 4L80E run without a computer? Can a 4L80E run without a computer? I have a 4L80E from a 2003 Chevy van that I want to test but I do not have the computer or wiring harness for it. Can I put it in a car and drive the car to see if it works? I know there is a gear selector lever on the side of the trans – can I drive the car if I am switching gears manually with the lever?
Thanks, -Dave
Thanks, -Dave
No you will need to find someway to control the trans. call around local trans shops and ask about a scafter shifter. Some have this and it would allow that test
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Hmm, well I need to buy an LS1 ECM and harness anyway, and I hear that the ECM controls both the engine and the trans… could I get something where the ECM would control the transmission only… sort of in a stand-alone mode… and let me test the transmission with a simple carbed SBC?
Yes several companies make stand alone Controllers for these
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Thanks.. but I don't think I want to spend a lot of money and time buying and setting up a stand alone system when I am just going to ditch it anyway. Can the stock PCM be programmed to run the 4L80E in stand-alone mode?
I do not know the answer to that question , You would need to ask some tuner guys about that one but I doubt it since the PCM relys on so much info from the engine to make shifts
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Simple answer is no. Are you putting the 4L80E behind a non-ECM engine? Your best bet if so would be to either convert it to a manual setup or non-ECM setup ... or find a different trans.
To make the stock ECM work as a stand alone, you will need RPM, TPS%, MPH at least to make it function. I am not sure what other things you will need to log from the engine to have the 4L80E happy and keep the shift pressures in check.
To make the stock ECM work as a stand alone, you will need RPM, TPS%, MPH at least to make it function. I am not sure what other things you will need to log from the engine to have the 4L80E happy and keep the shift pressures in check.
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I am doing a major engine/trans swap on a car I did not drive prior to the swap and I don’t want to waste valuable break-in time finding out whether or not the transmission and drivetrain are working properly. I would rather put in a regular SBC to test the transmission and drivetrain before putting in my new turbo engine… I want to get all of the driveline and suspension bugs out before I go to the tuners… but I want to run the new engine as little as possible before I get to the tuner.
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A 4L80E can be made to run without any electronics but it has to be full manual valve body which would get old on a daily driver. Someone, I think Yank, had one for sale on here not long ago. The link below is for info only. I am not trying to help them sell anything because they aren't a sponser here.
http://www.transmissioncenter.net/4L80E.htm
http://www.transmissioncenter.net/4L80E.htm
Last edited by LS1MCSS; Apr 2, 2007 at 09:12 PM.
