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]

The system I'm using is really working well, but I want to switch to the new chip to get more resolution in pulsewidth. That could pay some real dividends as the A/F mixture will steady out. Most people can't tell that it jumps around some with the MSI but, I can. MSII also offers a more sophisticated closed loop fuel control. MSII on the version 3 board will do what I am doing now with MSI but I want to let the more adventurous work the bugs out.

I would like to do COP eventually just because it can be done. Some weekend this winter I'll put the V3 board together and get MSII running on the stim in preparation for the code version I will want to run. I know that second wheel support is in the works with a version of code a couple of releases from now and the router board is being tested now.

I'm stuck with my 36-1 wheel since it's was part of the rotating mass Jake balanced (I've learned you don't mess with Jake's balance). So, whatever I do will involve a 36-1 and VR sensor. Of course that's not all bad because there will always be support for that configuration. I'm kind of looking at a Vanagon distibutor for the second wheel. I believe they are an optical sensor and fit right in. Otherwise, I think I have a dizzy with a pertronix in it.

I look over the MSEFI web site everyday and it is still hard to keep up. It's a rare day when there isn't some change to something. It's amazing what people are doing and since the MSII code is in C I expect it will develop farther. Being a more robust processor than MSI it has more onboard potential. Add to that CAN and slaving more boards and who knows what's up.

Time to start learning C

Dave