carb to TBI converions, Marine application

[1project2many]

how can I tell if I have a $E6 or a $EE?

You do not have $EE. That is from the 8051 ECM used with LT1 engines. The ecm is completely different.

BDJZ is $E6. Go to google and type BJDZ site:gearhead-efi.com and you'll get good results.

The 12 Ohm injectors could be used but there are a number of values that will need to be changed including the injector corrections and fuel flow rate.

If the calibration you're using can be set for non-electronic transmisison then you may be able to use a simple park input.

I think the wise choice is to get as much as possible from the junk yard truck.

[keaton]

is it possible to do a MAF conversion on this ECU?

i will have to add an ignition shift interrupt to this, hopefully the PCM wont get to cranky about it. the shift interrupt kills the ignition (+12 to coil) for a brief second to kill the load and allow the boat to get into or out of gear

I see some challenges using a 16168625 PCM for a Marine Carburetor to a Marine TBI conversion. Usually the 1227747 ECM is the Marine TBI computer of choice. The 1227747 has a park switch input, which eliminates the need for a Vehicle Speed Sensor. Setting the 1227747 park switch to Ground (battery -) tells the 1227747 the vehicle is in park. The 1227747 will operate an engine when the 1227747 thinks the engine is in park.

The 16168625 does not a simple park switch input. It might be possible to configure the transmission gear position inputs of the 16168625 to indicate park. (That's something I have not tried to do) The 16168625 uses Vehicle Speed input to select near idle or off idle fuel and spark tables. It might be possible to configure the vehicle speed parameters along with the TPS% parameters to "lock" the 16168625 into using the Off Idle fuel and spark tables only?

I'm sure a Marine engine would run with a 16168625 without a Vehicle Speed input, I'm just not sure how well the engine would run? Perhaps there is a way to have a GPS supply the 16168625 with a vehicle speed input?

dave w

Thanks for hoping in this thread.
I did see that there is a switch to tell this PCM that it is a manual transmission. in that case shouldn't it ignore all the transmission controls?
I have been looking at a GPS that does have a USART output, depending on the what the speed sensor output looks like I could program up a microcontroller to spit out the output to the PCM as needed.

or see if someone wants to trade my 8625 for their 7747

would the ECU from a vortec (96+) gain me anything? I found like 6 of them at the junk yard

You do not have $EE. That is from the 8051 ECM used with LT1 engines. The ecm is completely different.

BDJZ is $E6. Go to google and type BJDZ site:gearhead-efi.com and you'll get good results.

The 12 Ohm injectors could be used but there are a number of values that will need to be changed including the injector corrections and fuel flow rate.

If the calibration you're using can be set for non-electronic transmisison then you may be able to use a simple park input.

I think the wise choice is to get as much as possible from the junk yard truck.

I have been doing lots of searching and I know know I have a $E6. thank you for confirming it

the truck did not make it to the lot so i will call tomorrow to see if it's ready

[keaton]

I'm look on here and I don't see the park switch
http://www.gearhead-efi.com/Fuel-Inj...4&d=1322083598

[dave w]

I'm not sure what exactly happens when the manual transmission option is selected. I've converted a few 1227747's to the '8625; I selected manual transmission because they were using either a TH400 or a 700R4 with the factory VSS. I then disabled all the 4L60E / 4L80E transmission codes.

The '8625 needs a VSS input of 2000 (2K) pulses per mile. Here is a link to some VSS options: http://www.jagsthatrun.com/Pages/Spe...eedometer.html Other options include using the speedometer driven VSS from behind the dash of an early 1227747 vehicle (which is a 2K VSS). Maybe connect an electric motor or variable speed electric motor to an aftermarket VSS? The basic idea I have is to provide the '8625 with a VSS speed, so it will switch between Near Idle and Off Idle. Typically the '8625 will switch from near idle to off idle at 6 MPH with 2.1% or greater TPS. The '8625 could be well worth the VSS hassle to use in a Marine application? Imagine having near idle fuel and spark tables for "Wake Free" zones and docking maneuvers along with off idle fuel and spark tables for getting on and staying on the "Plane"!

If your plans are for open loop only, go with the 1227747, I'll gladly swap you two '7747's for the one '8625.

dave w