Got most of the stoiciometric mapping done on the O2 sensor, and the ignition map is probably pretty close to standard factory set up except for an idle advance of 19-20 deg.
So what remains to be done is high-power tuning and economy tuning in the "cruise" areas.
For full power tuning I'm probably gonna fork out for some rolling road time if i can find one with a skilled and experienced tuner/operator, just to risky trying to do this on the road.
anyway, economy tuning at cruise is a different matter, and I've been playing around a bit now, managing to pinch down guite a bit here and there.
Cruising on 2500-3000rpma and 25-35 kpa, I managed to reduce fueling quite a lot without detecting any missfires as such.
But then again, i suspect that high RPM missifre will not be as audible as on lower rpm's unless it is very severe..
What I did notice was that at some point the engine started sounding a bit hollow more "Whuuuuu" than "wrrrrrrrrr" sort of . Response was allso down and power seemed to have faded. It allso looked like the coolant temp did rise a bit.
Obviously I went quite lean at this point. mid 40's and lower on VE.
can a lean cruise condition like this be rectified by advancing the ignition at this point, or have i leaned down way to far when the described symptomes occur?
How do you really notice when you have gone as far as you can with leaning down and advancing ignition??
never done this before, so some input and comments from those of you with experience would be great!
