hey, i undid the modification.. it didnt make a difference so i removed megatune altogether and downloaded the newest versino ffrom diyautotune's site. i re-sent several MSQs starting from the beginning to the latest, i had the same issue..
Under light acceleration for example, i can see on the gauge: 15 (at idle), going up and down around 14, thru lets say 12 or so..At the same time, the laptop gauge will show 15 (at idle), and the go all the way to lean nearly immediately and stay there until i completely let off the gas.
You wideband and megasquirt should both be connected to the stock ECU ground location. You saying your clutch engagement is causing this to short. Sounds like your wiring is messed up.
Where do you get the power and ground for the MS and the Wideband?
I got the MS with the boomslang harness from Braineack. For the uego, i tapped the red 12v wire on the MS side of the boomslang, and the green-black for hte ground... that was after trying two of the black wires which turned out not to be the ground
You guys can flame me all you want, just tell me how to fix it !!
Make sure nothing is connected to the first pin on the bottom of the first connector (brown/white and black/blue). That is the neutral switch that seems to be causing your problem. It's 1V on the ECU pinout diagram.
That line reads 0V when in neutral or clutch in and a voltage (equal to or higher than your AFR voltage it seems) when in gear and clutch out.
I didn't cut the thick wire, just stripped off a small piece of insulation near the middle and temporarily wrapped the ground from the uego around that...
Worked like a charm! Before, even when working, the values were always off a few tenths.. now, it seems 100% accurate.
I went out, drove around, did some tuning, finally! Thanks guys!
So just to clarify in case some other newbie comes along in the future -- I used the THICK BLACK WIRE labeled ground in the diagram above.
The car's already running much better after just 5 minutes of driving / tuning, although when i push it into higher rpms with boost, i think i'm hitting a fuel cutoff or something, i noticed the car will just hiccup and the WB goes full lean for a few seconds. I'm sure i can figure that out though hehe