Megashift dropping out speed signal at certain speed

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gndan
Experienced MS/Extra'er
Posts: 211
Joined: Mon Nov 15, 2010 6:52 pm

Megashift dropping out speed signal at certain speed

Post by gndan »

I have been fighting this on two completely different Megashift (GPIO)/4L80E combos that have the speed signal wires very very well shielded and have good grounds.

On the specific setup that I am posting the Tune and log files for the speed sensor drops out at a speed around 45MPH when held consistent and very rarely at other random speeds (Most recent at the 1/4 mile track this weekend at 120MPH). When it drops out at 45 it reads approximately half the speed 22ish which causes a sudden drop out which because of the way the MS works it feels like it goes into neutral.

The truck has a MS3x on a 6.0 LQ4 (LS1) Turbo with a GM 4L80E automatic with a Megashift.

Has anyone experienced this on their Megashift? Hoping James can chime in since he has been working with the megashift lately.

Thanks in advance, Dan
jsmcortina
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Re: Megashift dropping out speed signal at certain speed

Post by jsmcortina »

I've not used megashift, I've used my own trans firmware.
See: http://www.msextra.com/forums/viewtopic ... 23&t=56163

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
gndan
Experienced MS/Extra'er
Posts: 211
Joined: Mon Nov 15, 2010 6:52 pm

Re: Megashift dropping out speed signal at certain speed

Post by gndan »

James,

I did not realize there is a difference. I guess I will try flashing your code into one of the controllers and see what happens. Will everything else still work correctly as far as the CAN network and the way Tunerstudio interfaces with it?

Thanks, Dan
jsmcortina
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Re: Megashift dropping out speed signal at certain speed

Post by jsmcortina »

The user interface is quite different. Maybe Andrew has a tune he could share? EDIT: wrong trans!

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
New users, please read the "Forum Help Page".
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