Righto, I've spent the last couple of weeks reading, searching and preying to any sort of god, about Megasquirt. The week before last I went ahead and installed an M45 Jackson Racing setup, AEM wideband (would have gonna innovate but I bought this when I thought I was going for AEM F/IC), and a MSPNP unit for a 96/97 model.
At first it wouldn't idle... turned out the check valve in the vacuum line was the wrong way around. But after that I got it started it up and it was idling healthily. I then tried that little edit to make the AEM afr's show up in afr instead of voltage. I assume the values didn't get changed because it ran terrible! So I switched that back and also deleted the MAF. Got it idling again and was content with myself after a hectic week.
Took it for a drive and realised that it needed tuning in a few key areas. The most concerning area for me is regular cruising with light throttle at about 3k rpm, it gets dangerously lean. It goes off the chart on the wideband gauge and goes beyond 17 on the MS setup, to the point where the car jerks a bit. A similar jerky feeling to engaging the clutch without gas.
The other problem area is when I give it gas, it gets down to about 10 for the afr, bogs down like buggery and really goes slow.
Now, conquering this shouldn't be too much of a problem. I need to subtract some fuel under heavy load and add some for cruising. I also need to make sure that the accel rpm addition stuff is turned off (for some reason I think it may have been left on my base map).
The plan was to make some small changes, drive around datalog, stop and then use the VE analyzer and see what I need to do. Is that a good idea?
My main issue is the ms manuals are currently down,
So I'm looking for a little extra guidance from you lot. How much should I try and change the fuel values with each attempt? How exactly do I rescale the table so that the max kpa is lower? I would just go at it and try the scale by box but not exactly sure how the number I put in pertains to the table. Any tips for tuning to a supercharger compared to a turbo? Any helpful insights?
Obviously, I'm not going to doing a tune of professional standards. I fully intend to make the trip to diyautotune and get it done properly in the not so distant future. But for now I need something that I can drive around without fear of damaging my motor.
Thanks for any help.
96 running stand alone mspnp96/97
jackson racing m45