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using a GM v6 ecu for a 4 cyl?

Old 12-09-2005, 06:54 PM
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Default using a GM v6 ecu for a 4 cyl?

Something I have been thinking about doing.It would be from a 3.8l GM TBI van(727 ecu).Anybody ever try this?
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Old 12-09-2005, 09:10 PM
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Default Re: using a GM v6 ecu for a 4 cyl?

gm never made a 3.8 tbi van
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Old 12-10-2005, 01:01 AM
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Default Re: using a GM v6 ecu for a 4 cyl?

Unless you're talking about some freaky ECU, there is no ------- way it will run an engine with 2 fewer cylinders.
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Old 12-10-2005, 01:11 AM
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Default Re: using a GM v6 ecu for a 4 cyl?

Originally Posted by pin
Unless you're talking about some freaky ECU, there is no ------- way it will run an engine with 2 fewer cylinders.
Ive used v6 ecu's on v8's and v8's on v6's with tbi you just change the prom but The ecu numbers must match up in the parts interchange catalog. it will run without changing the prom but but will overfuel and I got a check engine light for egr vavle on the one I tried. :P
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Old 12-10-2005, 03:40 AM
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Default Re: using a GM v6 ecu for a 4 cyl?

Originally Posted by highroller54
gm never made a 3.8 tbi van
I pretty sure some of them had TBI, like the lumina vans.
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Old 12-10-2005, 12:06 PM
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Default Re: using a GM v6 ecu for a 4 cyl?

Originally Posted by 88dx
I pretty sure some of them had TBI, like the lumina vans.
no, 2.8 and 3.1 60 degree v6 in the dustbuster van's
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Old 12-22-2005, 01:26 AM
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Default Re: using a GM v6 ecu for a 4 cyl?

I'm pretty sure the 727 ECM is the weatherpack style used in the TPI corvettes. It should work if you are willing to do the research.

Just curious, what kind of combination are you thinking of?

Originally Posted by pin
Unless you're talking about some freaky ECU, there is no ------- way it will run an engine with 2 fewer cylinders.
Actually this kind of thing is done quite often in the OBD1 GM circles. The 1227730 ECM was used on 2.8 MPFI, 5.0 TPI, 5.7 TPI, and a few others that I can't recall at the moment. Most of the older GM FI use batch fire, so its all in the PROM as the hardware is the same.
Also, I would suggest using a speed density port FI ECM. All of the TBI and mass air port FI ECMs use an arcane baud rate of 160 bps versus the later ones that use a much improved 8192 baud rate. ECMs such as the 1227727, 1227730 and 1227749 have been fairly thoroughly hacked. If you are looking for an obscure ECM definition cade and mask, check out Carbytes.
Unfortunately I haven't gotten to actually play around with the GM stuff because I am still trying to get my camaro back. I have been very seriously thinking about dropping my free.99 Northstar in the front of that bitch. If there is enough room left, or I an make enough I am going to turbo the Northstar as well. Still haven't decided which direction I am going to go for fuel management.
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Old 12-22-2005, 12:16 PM
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Default Re: using a GM v6 ecu for a 4 cyl?

what he said!!!!!!

86 TA WS6 5.0L

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Old 12-22-2005, 01:11 PM
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Default Re: using a GM v6 ecu for a 4 cyl?

Originally Posted by pin
Unless you're talking about some freaky ECU, there is no ------- way it will run an engine with 2 fewer cylinders.
It's gain fire fuel, and with how interchangeable the code is, the ignition can be configured to suit.
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Old 12-26-2005, 09:58 AM
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Default Re: using a GM v6 ecu for a 4 cyl?

I meant to say the 4.3l v6.The ecu I would be using is a 727 ecu set up a batch fire.They use two large injectors to fire into the TB and I would be using four high imped injectors in the intake manifold.I see no reason why that wouldn't work just fine.
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