http://www.msefi.com/viewtopic.php?t...light=autotune

Basically you connect your laptop, turn on autotune, and drive... and as you drive, the laptop changes the ve table in the megasquirt's RAM, and once you burn the table to flash, it's saved.

This is still an experimental feature though, so use at your own risk.

As soon as tofuball's car is back up, I plan on testing this.

Ken

 

So basically it is an automatic fuel map adjuster based on observed wideband readings and desired wideband readings? Does it wait until the wideband is warmed up first? After tuning a friend's TII to about 12:1 while in boost, after shutting it off for ~10min and starting up again, the wideband immideatly showed ~14:1 on the first few engine windups, and later showed the same 12:1 it showed before ..... I can't remember which wideband it was but it was based on the bosch sensor.

 

For the wideband, the megasquirt waits 30 seconds after startup before it uses the data from any O2 sensor to run closed loop, including wideband (don't remember where I read that, but I'm pretty sure that's what it does). The AFR might read weird for those 30 seconds, but I don't think it'll use the value. Tofuball and I use a techedge controller, and one of the LED's on that tells us when the sensor is heated up enough as well.... so a lot of the time, we just wait until the techedge says the sensor's warmed up, even though we don't have to.

So basically it doesn't matter if you're using wideband or not... In the megasquirt there's a variable that can be displayed that tells you what percentage the megasquirt is adjusting by to give you the desired AFR... megatune uses that to make adjustments to the VE table on the fly. So megatune doesn't actually care what AFR you have set in the AFR table, all it cares about is that the EGO correction variable stays near 100% (no corrections).