Came across this relevant video, the guy in it is really goofy but some interesting and surprising results with the oil windage. https://www.youtube.com/watch?v=bk7r0TL0Or4 I've watched a few of his videos, Definitely a interesting kinda guy. I think what that shows is they lack oil/windage control...

That is an interesting point.

Probably need to measure EGT too to get a better idea of what is happening in the cylinder. The other thing that comes to mind is moisture changing the burn of the fuel. It's been a long time since I've looked at it but they used water injector on aircraft and it changed the fuel burn characteristic...

As you say, moisture in the air is supposed to be a bad thing but then why does water injection increase power? I remember my old 308 was really happy on cold mornings, especially when there was a bit of fog about, you could hear it in the exhaust note. Maybe it's the way you have it tuned? Factory ...

Good to hear it's sorted.

This is from the 11p Overview PDF, Closed Throttle Volumetric Efficiency (VE) On engines with low and varying vacuum at idle it can be problematic using the MAP sensor signal for fueling. A closed throttle VE vs RPM table has been added. To enable the use of this table set “[xxxx] set = Closed Throt...

It's cammed right? (I can't remember what you have sorry). What kpa does it idle at?

I wonder if the IAC Kpa Vs RPM threshold needs adjustment.

I believe the normal idle setting is around the 20-30 steps? (or am I thinking V6 stuff?)

Throttle showing 0% at idle when coasting?

Try lowering the values in the IAC- Throttle Crack Offset Vs RPM table a bit.

Yes, that's right.

It's been a long time since I read the PDF.

In the original tune there was a parameter that set the spark curve once you went beyond the spark table. I guess it depends what VL400 did with it?