A totally different TP application (bin attached)

[Hog]

28 pin UV style chip that I ripped the bin from just like I would from a 27sf512. ECU is a MAP/RPM only marine unit that is used on high performance 2 stroke V6 outboards. There are multiple variations of this ECU that are the same thing with different chips. The bin I posted is from the most desirable A48 version, which is a 9200 RPM limit. Fueling should be mapped out past 11k (a common mod is upping the rev limit to 11,500 so the high compression drag motors aren't on a limiter at half track)

Could you please tell me what the tube is for?

peace
Hog

[brian617]

Could you please tell me what the tube is for?

peace
Hog

I was guessing integrated MAP? I'm curious of the blue square switch in the middle, optional fuel or spark tables?

[RobertISaar]

i couldn't tell if that was a hex switch or a trim pot.... either could have some effect on fuel/spark, but I'm not nearly far enough into the code to say for certain.

can almost make out the crystal frequency from that pic, but not quite.... that information would be good to figure out some of these timing calcs.

[1BadAction]

Could you please tell me what the tube is for?

peace
Hog

Map sensor. Everything is internal to these, the tygon tube exits the aluminum case through a rubber sealed opening and attaches to the Plenum.

I'm curious of the blue square switch in the middle, optional fuel or spark tables?

The trim pot will adjust the whole fuel curve plus or minus 10% from the base table. When you go higher compression or cut the intake to get more air in the motor, the only way you can adjust them is by richening up the entire curve until it's not lean when wide open... which is fine at WOT but tends to make the motor slobbery at part throttle and idle.

Here's the injector cleaning sheet. They were tested at 56PSI and the numbers listed are cc/min.

[RobertISaar]

i have a decent amount of code figured out at the moment.... but there is some really weird stuff going on with this code, i'll have some very basic stuff figured out pretty quickly, but a lot of this feels really clunky compared to what GM did.

[1BadAction]

a lot of this feels really clunky compared to what GM did.

Yea, I can see that falls right in line with what it was. Limited scope and limited production, most likely done on a small budget, and extremely simple application.

I have an earlier analog box (1985/86 vintage) and the board looks like something someone made in their garage with parts stolen from a tandy and etching solution. LMAO. In a future project I'm going to use the waterproof aluminum case to house a MS3 Pro board and do full sequential injection and ECM controlled ignition.

[1project2many]

Yea, I can see that falls right in line with what it was. Limited scope and limited production, most likely done on a small budget, and extremely simple application.

So if you identify tables, develop custom code, you'll likely own the market for tuning this thing.

[1BadAction]

So if you identify tables, develop custom code, you'll likely own the market for tuning this thing.

Way too easy to turn 2 strokes into paperweights. If I can adjust fueling tables for my own engines and injector offsets to be able to get away from the stock $200 each injectors I'll be extremely happy.

If/when we figure out anything definitive, I planned on posting a link back to what we find here and info on tunerpro/autoprom on our tech forum @ www.extremeperformanceoutboards.com - we already have a guy running motec and another that's pretty good with megasquirt who are posting information, a way to tune the stock box would be a great addition. The stock box option is the cheapest and simplest by far, doesn't require custom harnesses or changing fuel, charging, and ignition systems. Not going to turn the information loose until I have a chance to test it myself though.