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Piggy Backing ECM's

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Old 06-20-2007, 09:51 PM
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Piggy Backing ECM's

I am looking into switching to a MegaSquirt becasue im going to be adding boost to a engine and want to keep the electronic transmission controals. I know i can run two ECU's but the big question is how do i feed both the ECU's signals that they both require with out loosing signal quality while spliting the signal
Old 06-20-2007, 09:59 PM
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Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
Re: Piggy Backing ECM's

What transmission controls are you talking about???


What kind of car do you have?
The f body cars do not have an electronic transmission. The only electrical requirement is for torque convertor lockup, and the megasquirt can handle that and much more.
Old 06-21-2007, 05:52 AM
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Re: Piggy Backing ECM's

im looking to control a 4L60E, i know this is not stock stuff but what im building no where near stock
Old 06-21-2007, 07:49 AM
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Car: 84 Z28 H.O. w/Megasquirt II
Engine: semi-stock L69
Transmission: T-5 non W/C
Axle/Gears: 3.73 open
Re: Piggy Backing ECM's

You could use a NPN transistor to amplify the signal. Please bear with my bad art.

Code:
5 volt source-->N P N--->to both ecm's
                  ^
                  |
                  |
            from dizzy
On a side note...if your willing to wait a few months, the GPIO board will be available for the Megasquirt. It'll control your 4l60e, and just about anything else you could imagine. That'll save the headache of piggy-backing.

Last edited by pizza_guy; 06-21-2007 at 07:58 AM.
Old 06-21-2007, 09:13 PM
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Re: Piggy Backing ECM's

ok when using a transitor to amplify the signal im still having to split the wires to i simply just put a splice in and make one wire go into two or do i need to then amplify each signal
Old 06-22-2007, 12:34 PM
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Car: 84 Z28 H.O. w/Megasquirt II
Engine: semi-stock L69
Transmission: T-5 non W/C
Axle/Gears: 3.73 open
Re: Piggy Backing ECM's

I would initially try it without the amplification at all. There is a chance you won't even need it. IMO, at the most, you'll only need to amplify before splitting the cable.

However, a little overkill won't hurt anything, and if you're willing to spend the money(quite a little in this case) and time to amplify after splitting, it wouldn't hurt anything.
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