Ahhh, I didn't realize their in-dash gauges also had data logging capability. I was looking at their handhelds.

Yep, it's relatively new, and has basically eliminated the lc-1 for most applications. And at this price even carb guys should have an AFR IMO. Great tuning tool.

I plan on putting a gauge holder right in between the hatches so they can be cracked to read the gauge for now. I need to keep it in the engine bay so I can log at the same time with the ecu software. I may get the extension cable and install twin sensors later, just need to find a place for them on my already cluttered dash.

I am heading out of town in a few minutes but I will post a few things and be back on here in a couple of days
1.Mefi3 to 4b-Bob at mefi burn will convert the programs for just a few dollars IF yu have a base program in 4b that you need.
2. Converting your motor from mefi3 to 4 or 4b ECU using your original harness, GM motorsports sells a adater harness that is plug and play, Tyler Crockett told me when I did mine that its easy to just repin, the problem we had was there were wires that did NOT show on the diagram, he couldn't figure it out either and I ended up with a butchered up mefi3 harness and buying a mefi 4 harness that did NOT fit right on, even more adapting.
3, IF you were starting from scratch, if I was starting from scratch and had to buy EVERYTHING including a ECU and harness, I would buy something ELSE with autotune. 2 years ago I converted a 600 hp PONTIAC to mefi 4a rail injection, scorpion throttle body. The harness and ECU can be had new from GM motorsports for only 620$, a STEAL BUT in retrospect when I add up the money I DIDN'T earn being at my own shop and the money I paid the dyno operator in the end I could have bought TWO or THREE auto tune ECUS and harnesses, but you learn , what can I say!
4. IF I was the OP and already owned a mefi3 boat with good harnesses, had the patience to tune , drive, record, tune, upload, drive etc I would probably buy the mefiburn again and do it myself. IF you don't have someone competent to help you, take notes, or drive while your doing it you are a better man than me IF you plan on doing it in the boat SOLO, I had my son who is one of the best wrenches I know (I TAUGHT him) who ran keyboard, took notes while I drove when we did my boat , we would stop and I would calculate. I will say though TYLER CROCKETT dynoed the motor and set the original program for us, we just fine tuned it on the water. I would have actually had no problem paying him to tune it on the water BUT I had serious time constraints and its about impossible for me to spend a day during week in his neighborhood tuning. We did mine a little at a time. Mefiburn is a GREAT tool for self tuners, however, the program Crockett has uses something else called "slew" and he was able to change fuel PW while under a load and see what it did to the afr's and THEN stop and make changes where mefi burn users have to watch the afr meter, record, stop,calculate changes, upload, test drive and repeatIt is DEFINATELY time consuming
I will post more when I have time, Smitty

Perfect

My responsible side says: Pick a programmer, run his program with A/F bungs. Send it back with your data, get it updated and you are done. To properly do this, it is a 2-3 man job. Running down a lake/body of water at max speed with a laptop and wires strewn across the back seat isnt as fun or easy as it sounds. I've had the A/F laptop in the back seat a dozen times and you really arent cruising around, the bulk of the benefit & programming is at WOT so all you do is run around bare knuckeled for hours on end. 5500 RPM isnt the time or place for "trying out" your new software either.

My mad scientist side says: If you do it... make yourself a nice harness neatly taped where all the wires connect (Sensor, RPM, Battery leads, reset button) keeping them safe with a way to neatly pin the wires away from the belts & such. Also, long enough to run to the laptop on the floor where the laptop can be secured to something. I cant tell you how many runs I made and lost data because the freakin wires were flapping around at 85 MPH and the A/F had gaps due to the USB flopping around in the computer. Depending on the cam & where the A/F is placed you will get some moisture (not reversion) this pisses the A/F bung off (Innovate/Bosh Style) so, there isnt any fooling around idleing around. Start it and go! Just a few observations of wasted weekends playing with A/F....

Been using the Innovate data logging feature on the snowmobiles for a few years not so i dont think its that new..

This post may have changed my mind completely! You just painted quite a horror story for me. Maybe it is a better idea to go with a canned tune?

Remember, you don't HAVE to tune on the boat. You can log data from the AFR and then go back home, to the dock, etc to make the changes. Done in minutes instead of waiting days, weeks, etc for your MEFI to come back. Just a thought.

Thanks.

I've chilled out a little since then, I read and responded at 12am EST. I'm still going for it, my curiosity must be cured.

The locals are even more skeptical, a few so called "experts" have attempted tunes and failed. One guy convinced a friend to convert his 555cu ci 500EFIs to carb!

I do want my boat to run, but I also want to know what the big deal is? Maybe I can help others in the future.

Don't let all the opinions get to you. If you're interested in learning how to tune, how to get your boat running to YOUR satisfaction, and having the ability to say "I did this myself!" then go for it. I can tell you first hand.... it may be a bit intimidating at first but it can be done and the satisfaction in the end is well worth it, IMHO. I upgraded to a mefi4a in 2010, went the mefiburn route and am still fiddling with it a here and there. I'm not sure why some believe it should be "one and done." I learn something each and every time and for me, is why I do it. To each their own I suppose.