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Hardon marine ECU kit for 500 EFI.

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Hardon marine ECU kit for 500 EFI.

Old 11-21-2018, 02:19 PM
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Default Hardon marine ECU kit for 500 EFI.

Any one ever try the hardon marine ECU - throttle body kit with air filter ? I tried the AZ kit years back and didnít find 50 RPM s.
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Old 11-22-2018, 08:52 AM
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Who else does Ecu tuning?
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Old 11-22-2018, 09:19 AM
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Mark Boos Precision Marine
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Old 11-22-2018, 11:15 AM
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Sent him a email. Thank u.
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Old 11-22-2018, 11:21 AM
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MEFI 3 ?? Smitty on here does tuning....goes by Articfriends
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Old 11-22-2018, 11:28 AM
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These are 2000 model 500 efi s. That would be 3 s. I think
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Old 11-22-2018, 11:30 AM
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yes they should be
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Old 11-22-2018, 11:36 AM
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20 year set up - extremely poor fuel injectors - for one they are ball and seat for a jist - outdated ecm and NLA inwhich is extremely limited. I would buy a current set up thru holley or whomever that one can always program on the water and data log instead of thru the mail. If one is updating their boat I would update to the current technology including the injectors. Nothing special about MEFI 3 period nor the 500 efi fuel / air set up. . It is not even supported anymore. And if one was on the cheap - a current massaged carb and intake would out perform that old set up.
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Old 11-22-2018, 11:38 AM
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all 500 efi were MEFI 3 oem stock Merc racing. Some owners have changed to MEFI 4 on a conversion after the fact way down the road.especially ones that the MEFI 3 went bad nor fixable.
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Old 11-22-2018, 12:04 PM
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I was just curious if there was a bit more hp out of it with a tune. If I keep it I will make bigger changes.
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