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Forum: Do It Yourself, Boating on a Budget

10-05-2016, 01:23 PM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

IF I dyno my stock hp500 efis this winter I will...

IF I dyno my stock hp500 efis this winter I will check timing at a certain map/rpm then disconnect the knock sensor and see if total timing is reduced somewhere and post my results, will be after...

Forum: Do It Yourself, Boating on a Budget

10-05-2016, 01:17 PM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

I looked at several tunes I have, looks like most...

I looked at several tunes I have, looks like most the stuff Tyler crockett has done has #44 unchecked, a stock hp 500 does have it checked but there are other things in the tune that will affect...

Forum: Do It Yourself, Boating on a Budget

10-04-2016, 08:30 PM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

I called bob at mefiburn and he told me that...

I called bob at mefiburn and he told me that indeed there IS this possibility on some, not all, mefi3's and 4s, he said. The essiest way to ensure it never happens Is to un-check the flag for...

Forum: Do It Yourself, Boating on a Budget

09-29-2016, 03:15 PM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

Ever heard of it on a mefi 3 or four?, I know on...

Ever heard of it on a mefi 3 or four?, I know on passenger car when you first start them if the KNOCK sensor is shorted out or has an open circuit with no resistance whatsoever it could throw a...

Forum: Do It Yourself, Boating on a Budget

09-29-2016, 09:08 AM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

Also interesting, ran mefi4 on my blower motor...

Also interesting, ran mefi4 on my blower motor and various other projects plus ran and tuned quite a few mefi3s now, must be in flags and schalars table, i do turn most the code crap off anything...

Forum: Do It Yourself, Boating on a Budget

09-29-2016, 09:03 AM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

So sounds like a early mefi1 thing? Like i said,...

So sounds like a early mefi1 thing? Like i said, new to me, we learn something new everday,thanks!!!

Forum: Do It Yourself, Boating on a Budget

09-28-2016, 10:42 PM

Replies: 19

502 mpi gen v rebuild - advice needed

Views: 6,841

Posted By articfriends

I never heard of mefi advancing the timing on...

I never heard of mefi advancing the timing on start up to test the knock sensor, new to me. The stock 502 tune is terrible in the regards that max timing is only about 26 degrees and afrs are pig...

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