Bbc/efi/gm ecm?
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Bbc/efi/gm ecm?

  1. #1
    Senior Member Lildave's Avatar
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    Default Bbc/efi/gm ecm?

    Can this be done, and use HP Tuners?

    Could the open loop/closed loop/power enrichment tables still be used?

    Could you use the coil on plug setup with stock LS coils?

    Can a BBC Jet fire up and run the same on a 70 degree day in Colorado as it does on a 100 degree day in Arkansas (without spending $3k+)?


    I'm not an EFI guru, so if this gets deeply technical, please dumb it down for me some...





    Not that I will, or even could do this, but it seems like a good topic that might be edjucational (as long as it doesn't stray into a carb vs efi pissing match)

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    New here Beer:30's Avatar
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    You will likely be every bit of $3K. But yes, an EFI'd boat will run just as good at the two locations without any changes. HP will be different, but the drivability will remain the same.

    If using a stock GM ECM, you would need one from a coil-per-cylinder vehicle. For BB, I would say an ECM from a 2001-2005 PU with 8.1L. Then use HPTuners to adjust accordingly.

    Or, go aftermarket and set it up accordingly.

    If you plumb O2 sensor(s) into the DRY part of the exhaust, you can run closed loop.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member ap67et10's Avatar
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    Whether you got an 8.1 or LS you could make it work, but for what you are getting for your time and money, it's a complete waste. Figure it'll cost at least 3-400 for a harness and PCM. Then depending on what PCM you get you'd have to fab the exact crank and cam signals to the bbc. So if it's an early LS you'd have to get the 24x wheel that's used and figure out how to attach it to the bbc. That's not even the hardest part though. You need to figure out what the factory crank position to sensor relationship is and duplicate it on the bbc. You would have to do the exact same thing for the cam position also. Having the wrong sensor or incorrect position will mean it may not run. Also, you would need to cut and splice the harness to adapt all of its sensors. If you used the LS setup you would also need to incorrectly wire the injector and cool signals to get the PCM to output the correct firing order. You would also need to upgrade to the speed density only load logic, MAF would be a nightmare.

    You would be so much further ahead if you just went aftermarket. Obviously I love megasquirt ECUs and that's because you can use so many different brands or styles of parts you want and make them all work.

    I run LS coils on my bbc. I use a ford crank sensor, a ford cam sensor, custom crank and cam trigger wheel (total cost on all of those parts is less that $100), I have sensors from junk yards, and everything can be adapted with the megasquirt, you can't do that with a factory PCM....well you can't even do that with most aftermarkets either.


    Andrew

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    New here Beer:30's Avatar
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    For a boat, I would also start fresh with an aftermarket ECM. I was thinking he had an OEM unit already and was trying to save money.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Highaboosta Unchained's Avatar
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    Quote Originally Posted by ap67et10 View Post
    You would be so much further ahead if you just went aftermarket. Obviously I love megasquirt ECUs and that's because you can use so many different brands or styles of parts you want and make them all work.
    Andrew
    That was my thoughts too.
    Aftermarket ECU's are made user friendly and factory ECU's are made more proprietary.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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    I spoke to a owner of a single turbo 5.3 LS1, in a Mustnag GT yesterday and he was real happy with his Holley fuel injection system, stated they were very user friendly and the self programmable feature was great for his application. I know XFI have self programming fuel tables, although I have used only used the Classic boxes.
    Any feedback from the forum on that?

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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by Jspeeddemon View Post
    I spoke to a owner of a single turbo 5.3 LS1, in a Mustnag GT yesterday and he was real happy with his Holley fuel injection system, stated they were very user friendly and the self programmable feature was great for his application. I know XFI have self programming fuel tables, although I have used only used the Classic boxes.
    Any feedback from the forum on that?
    We bought a few of those Holley Unit they are nice.

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    Highaboosta Unchained's Avatar
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    Quote Originally Posted by Jspeeddemon View Post
    I spoke to a owner of a single turbo 5.3 LS1, in a Mustnag GT yesterday and he was real happy with his Holley fuel injection system, stated they were very user friendly and the self programmable feature was great for his application. I know XFI have self programming fuel tables, although I have used only used the Classic boxes.
    Any feedback from the forum on that?
    I've heard good things about the Holley system too but have no hands on experience with one.
    The FAST XFI is really not what you would call "self programming"
    The final tune can be no better that the target fuel or lambda table.
    What it does in the learning mode is apply a % of the O2 correction to the main V/E table so there becomes progressively less cclosed loop correction to match the target A/F or Lambda table.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

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    New here Beer:30's Avatar
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    Quote Originally Posted by Unchained View Post
    I've heard good things about the Holley system too but have no hands on experience with one.
    The FAST XFI is really not what you would call "self programming"
    The final tune can be no better that the target fuel or lambda table.
    What it does in the learning mode is apply a % of the O2 correction to the main V/E table so there becomes progressively less cclosed loop correction to match the target A/F or Lambda table.
    I haven't gone hands-on with a NEW Holley unit, but the Commander 950 system is very hands-on required. You have to program everything. The self tunings would be much easier to get the bulk done, and then fine-tune from there.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

  12. #10
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    Doug Flynn, the engineer at Holley is a friend of mine. The new system they have is very user friendly and just about dummy proof. Millions went into R&D on the system as it was destined for an OEM.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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