EFI or Carb
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EFI or Carb

  1. #1
    Member boataholic's Avatar
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    Default EFI or Carb

    I am thinking about building a 502 motor to go into a 24 HTM. I am looking to get as many peeps opinions in regard to go EFI or Carb? What are the Pros and Cons of each motor? What I would like to have is a reliable turnkey motor. Thanks.

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    Quote Originally Posted by boataholic View Post
    I am thinking about building a 502 motor to go into a 24 HTM. I am looking to get as many peeps opinions in regard to go EFI or Carb? What are the Pros and Cons of each motor? What I would like to have is a reliable turnkey motor. Thanks.
    I am no expert but what I have learned is that is is all about the tune.

    Tuned right I like a carb because it is simple and easy. It is also less expensive. You may not get the same fuel economy in the mid range but the top end will be the same.

    For resale the EFI is the way to go because more people want it. EFI is better if you boat at elevation AND sea level because you don't have to adjust anything....but if you boat in the same place it is not an issue.

    You can make the same power from either but the EFI is more precise through the entire RPM band. Again, all of this does not matter if it is not tuned properly.

    My opinion is less electronics = less to go wrong.

  4. #3
    AKA DrewDown Werdnamirg's Avatar
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    EFI Pro= docking manners.

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    Senior Member blurred vision's Avatar
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    I have a SR 24...It had a 454 fuel injected with a pro charger,,, had a few computer problems,,,Sold it,Went to a 871 with dual carbs No computer...works great and i can tune it myself.....

  7. #5
    DCM
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    I have had both and unless you spend the BIG bucks on the EFI system, don't expect it to be right. I spent over $11k on an EFI system for a blower motor and it melted the heads twice. They could never get the tune right. Also any temp or atmospheric changes would really screw up the tune. Run perfect at Elsinore, but couldn't get it off the trailer in Havasu. In the end, I pulled off the EFI system and put on a pair of dominators. Motor never skipped a beat afterwards.

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    Frozen Hoser Airpacker's Avatar
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    Quote Originally Posted by DCM View Post
    I have had both and unless you spend the BIG bucks on the EFI system, don't expect it to be right. I spent over $11k on an EFI system for a blower motor and it melted the heads twice. They could never get the tune right. Also any temp or atmospheric changes would really screw up the tune. Run perfect at Elsinore, but couldn't get it off the trailer in Havasu. In the end, I pulled off the EFI system and put on a pair of dominators. Motor never skipped a beat afterwards.

    Well, that makes no sence whatsoever. The EFI system is designed to compensate for "atmospheric changes" where as a carb cannot.

    I suggest to your your programmer / tuner was incompetent at best or someone sold you the WRONG EFI system from the get go.

    A properly programmed MEFI 3, MEFI 4, PCM555 can run a $100,000 mercury racing engine perfectly, never needing any adjustment. Why is that you think?

  9. #7
    Highaboosta Unchained's Avatar
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    Quote Originally Posted by DCM View Post
    I have had both and unless you spend the BIG bucks on the EFI system, don't expect it to be right. I spent over $11k on an EFI system for a blower motor and it melted the heads twice. They could never get the tune right. Also any temp or atmospheric changes would really screw up the tune. Run perfect at Elsinore, but couldn't get it off the trailer in Havasu. In the end, I pulled off the EFI system and put on a pair of dominators. Motor never skipped a beat afterwards.
    I agree with Airpacker.
    You must have had the Three Stooges tune for you.

    Results with EFI have less to do with the name brand of the system than with the skill of the tuner.
    Last edited by Unchained; 04-25-2010 at 08:34 AM.

    Twin Turbo 1800 HP V-Drive lake boat

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    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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    Senior Member blurred vision's Avatar
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    I told teague what engine i had....and the specs....They gave me a set of carbs..i took them out of the box with their adjustments and jets,bolted them on to my 871... worked perfect . I have had them for 3 years,worked flawless and never made an ajustment.....

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    Highaboosta Unchained's Avatar
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    You know those pesky cell phones are always cutting out and can't be trusted either.
    Back when we used a couple tin cans with a wire stretched between them it worked flawless and never required an adjustment.

    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

  12. #10
    Senior Member ap67et10's Avatar
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    Quote Originally Posted by DCM View Post
    I have had both and unless you spend the BIG bucks on the EFI system, don't expect it to be right. I spent over $11k on an EFI system for a blower motor and it melted the heads twice. They could never get the tune right. Also any temp or atmospheric changes would really screw up the tune. Run perfect at Elsinore, but couldn't get it off the trailer in Havasu. In the end, I pulled off the EFI system and put on a pair of dominators. Motor never skipped a beat afterwards.

    just a shot in the dark here, but was this a roots blower setup? if it was, were you running injectors on the ports or above the blower? this determines where the IAT sensor should be, if you run injectors above the blower the IAT needs to be above the blower, if you run in the ports than the IAT needs to be below the blower.

    i've read of a ton of issues with guys running roots and having all kinds of problems, which were all related to the IAT sensor location in relation to where the injectors were. again, this is something that a skilled tuner/builder would know.

    i would also be curious as to where they pulled the MAP reading.

    what efi system were you running and who did the tuning? if you care to say....

    Andrew

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