A/F ratio
#11
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Just trying to wrap my head around this......so if I find I have the A/F ratio a little "lean" at say 12 or 13, I can find this out with this kit but would have to send the ECM in to be re-programed? Or at those numbers, (I was told about 11.5 is what I should be running) can I richen it up a little with higher fuel pressure???
Jeffswav, what do you mean by letting the PCM "tweak" it out..? Thanks.
Jeffswav, what do you mean by letting the PCM "tweak" it out..? Thanks.
The a/f meter will tell you if there are "spots" that are different etc.
You would really only need to program if you find a range or speed that for no apparent reason becomes much leaner or richer when running the boat.
Better to put the bung in the forward most part of the riser or elbow. You'll need a pretty talented welder to install in so it won't leak, etc.
#12
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If you have a nice consistent fuel curve already and it it's a little lean or rich, you can use the fuel pressure adjustment to fix the condition.
The a/f meter will tell you if there are "spots" that are different etc.
You would really only need to program if you find a range or speed that for no apparent reason becomes much leaner or richer when running the boat.
Better to put the bung in the forward most part of the riser or elbow. You'll need a pretty talented welder to install in so it won't leak, etc.
The a/f meter will tell you if there are "spots" that are different etc.
You would really only need to program if you find a range or speed that for no apparent reason becomes much leaner or richer when running the boat.
Better to put the bung in the forward most part of the riser or elbow. You'll need a pretty talented welder to install in so it won't leak, etc.
I also agree about a "good" welder.....
#13
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Thanks for that, on the dyno my numbers were a little lean but I was told the numbers would come down with the engine in the boat with the wet exhaust. My numbers on the dyno were 13.56 @ 3000rpm and dropped to 11.56 @ 4700rpm so hopefully if I am still a little lean when I use the A/F scan tool I can adjust the fuel regulator......
I also agree about a "good" welder.....
I also agree about a "good" welder.....
Matter of fact, I'd have them make sure your tuning is acceptable by their standards.
No reason for you to be responsible for fuel trim if you're buying/building a new engine.
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Again, you need to check the af's while running the boat in the water on plane. Adjust the fuel curve according to the engine builder's recommendation (not what someone on a forum tells you).
Matter of fact, I'd have them make sure your tuning is acceptable by their standards.
No reason for you to be responsible for fuel trim if you're buying/building a new engine.
Matter of fact, I'd have them make sure your tuning is acceptable by their standards.
No reason for you to be responsible for fuel trim if you're buying/building a new engine.
http://www.offshoreonly.com/forums/g...she-lives.html
Long story short, I have ordered the A/F ratio scan tool and will run the boat with that and the lap top and see what umbers I get and go from there....as soon as it stops snowing..!!!
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http://www.innovatemotorsports.com/products/lm2.php
#18
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The Innovate LM2will only monitor the A/F. If you have MPI/EFI you can somewhat adjust the mixture if it is close to what it should be, but as hallj stated you can't change the shape or curve of the mixture.
Jeffswav has the Holley EFI setup so he can change the setup using his laptop, but with the stock MEFI1,2,3,4 you would better off to pay someone to reprogram it for you and several builders on the forum can do that for you.
Jeffswav has the Holley EFI setup so he can change the setup using his laptop, but with the stock MEFI1,2,3,4 you would better off to pay someone to reprogram it for you and several builders on the forum can do that for you.
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This is what I ordered, I can change settings without sending the ECM out???
http://www.innovatemotorsports.com/products/lm2.php
http://www.innovatemotorsports.com/products/lm2.php
The link you put up is for the tool to "measure" what's going on.
You can use the fuel pressure regulator to change it up or down as long as there are no trouble areas. The meter will tell you if there are.
Otherwise, if you have spots in the rpm range that are rich or too lean in the curve you will have to reprogram it.
You really ought to have this done for you by a professional based on what you're saying. If you built a nice engine with someone and they are leaving it up to you to finish it... I don't know... And you are playing with one aspect that will kill your motor if you are not sure of what you're doing.
Having "car guys" build boat engines never seems to smell right.
Just be careful and don't lean it out for very long.
If the reprogram is necessary and if you send it out, you'll need to keep testing until you know what you have.
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There is no way to change fuel curve in the box without someone flashing it.
The link you put up is for the tool to "measure" what's going on.
You can use the fuel pressure regulator to change it up or down as long as there are no trouble areas. The meter will tell you if there are.
Otherwise, if you have spots in the rpm range that are rich or too lean in the curve you will have to reprogram it.
You really ought to have this done for you by a professional based on what you're saying. If you built a nice engine with someone and they are leaving it up to you to finish it... I don't know... And you are playing with one aspect that will kill your motor if you are not sure of what you're doing.
Having "car guys" build boat engines never seems to smell right.
Just be careful and don't lean it out for very long.
If the reprogram is necessary and if you send it out, you'll need to keep testing until you know what you have.
The link you put up is for the tool to "measure" what's going on.
You can use the fuel pressure regulator to change it up or down as long as there are no trouble areas. The meter will tell you if there are.
Otherwise, if you have spots in the rpm range that are rich or too lean in the curve you will have to reprogram it.
You really ought to have this done for you by a professional based on what you're saying. If you built a nice engine with someone and they are leaving it up to you to finish it... I don't know... And you are playing with one aspect that will kill your motor if you are not sure of what you're doing.
Having "car guys" build boat engines never seems to smell right.
Just be careful and don't lean it out for very long.
If the reprogram is necessary and if you send it out, you'll need to keep testing until you know what you have.
I had my ECM re-flashed by Mark Boos but perhaps I did not supply him with all the info he needed, on the dyno it seemed to run a little lean, but until we run it on the water under load I don't know if we got it right.
The A/F reader I ordered comes with software and a laptop connection so I assume certain things can be changed.......as far as getting a "professional" up here to set it up for me, it ain't gonna happen unless I fly somebody in......the other half would shoot me.....
Thanks for all the feedback boys......