Offshoreonly.com - Hardon marine ECU kit for 500 EFI.

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Velocity Tom

11-21-2018 01:19 PM

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 didn’t find 50 RPM s.

Velocity Tom

11-22-2018 07:52 AM

Who else does Ecu tuning?

VoodooRob

11-22-2018 08:19 AM

Mark Boos Precision Marine

Velocity Tom

11-22-2018 10:15 AM

Sent him a email. Thank u.

F-2 Speedy

11-22-2018 10:21 AM

MEFI 3 ?? Smitty on here does tuning....goes by Articfriends

Velocity Tom

11-22-2018 10:28 AM

These are 2000 model 500 efi s. That would be 3 s. I think

F-2 Speedy

11-22-2018 10:30 AM

yes they should be

BUP	11-22-2018 10:36 AM

20 year set up - extremely poor fuel injectors - for one they are ball and seat for a jist - outdated ecm and NLA inwhich is extremely limited.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.

BUP	11-22-2018 10:38 AM

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.

Velocity Tom

11-22-2018 11:04 AM

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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