Megasquirt tune files, request to post .msq files Options

[Rikyrat]

EGADS, tuning my megasquirt fi system, is driving me nervous.

If anybody has and would wiling to share tune files with me, I would be very appreciative. As that would allow me to compare it with mine

Thank you in advance

[BeatNavy]

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Good info from Jeff. From what I've heard alpha-N may be the way to go with ITB's. I actually ran Alpha-N on mine for a while (it's a stock 2.0 throttle body/manifold), and it ran pretty well. I just didn't seem to be getting a strong enough vacuum at idle to make idle fine-tuning possible. This is related to my second comment...

...don't put TOO much stock in type 4 AFR readings at idle. You MAY get something useful, or you may not, depending on a number of factors. I was crazy rich when my AFR showed crazy lean, and that had me chasing my tail with VE values and other settings for a long time. My point is use other inputs besides AFR at idle to determine the best tune. I should have trusted my instincts earlier.

Yeah, tell us more about your setup.

[GregAmy]

...don't put TOO much stock in type 4 AFR readings at idle.

Know what I use for tuning idle? The ole D-Jet idle hunt.

D-Jet fans will remember that the engine loves to hunt idle when it's to lean. It'll waiver between +/- 100-200 RPM when you get it too lean. That's when you reached over to dial the knob on the ECU a click or so to get it to stop hunting. Same thing happened when the CHT was telling the engine that it was warmed up when it actually wasn't warm enough: it would hunt idle for a bit until everything actually got nice a toasty.

So that's what I do for tuning. I'll continue to lean it out at various temps until it wants to hunt, then I'll richen it. Do that through the whole range and the car warms up and idles nicely. Usually results in the AFRs showing around 15 when fully warmed up.

Of course, mine is a stone-dead-stock engine. I have no idea what kind of action that'll result in when I rebuild it with more compression and a non-D-Jet cam. Do they still do hunt when modded?

Greg