Lotta fun with Megasquirt, Autotune, tunes while you drive Options

[DNHunt]

I downloaded a newer version of Megasquirt with autotune. It uses a wideband O2 meter to adjust the air fuel mixture to a target while you drive. The targets vary according to RPM and manifold vacuum. I have a high of 14 at cruise and a low of 12.6 at WOT. Megasquit keeps adjusting until the amount of fuel gives the desired voltage from the O2 meter. It speeds up tuning a ton. (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif)

It's cool to see it changing without any key strokes on the computer. There are a couple things to consider (there always are). Tuning is only as good as the O2 meter and the air fuel mixture is just a number pulled out of the air. It will not tune the ignition side of the ECU. So, when I get everything sorted out and the engine well broken in it still goes on a dyno.

Dave

[DNHunt]

Andrew

Play with it on the stim first to see how the gauges work and stuff. When you get it in the car get the thing running then play with it at idle. Mess with the constants such as opening time and pulse width modulation etc all at idle. Play with the VE table and the tuning screens. The worst that will happen is it will die. Play with afterstart enrichment and warmup enrichment. When you feel comfortable take it on the road and do some tuning. Save the files as you make changes cause you can always go back. Get a good wideband O2 meter and pay attention to it while tuning.

Tom

The auto tune is pretty slick. It's tough to use it at high RPM and low vacuum cause you just don't linger there for very long, but, it will tune cruise very quickly.

Dave