Well I had a play on the way into work (50 miles or so).
The base MS map had 15 degrees at idle, dropping to 8 for cruise cells, and back to 12 for WOT and into boosted cells.
After reading what you guys had to say and on rx7forum etc, I\'ve made some fairly big changes.
I\'m running 0 degrees split for the majority of the map. After a bit of experimentation I\'ve gone for -3 degrees split in idle conditions. Seems to have given more a more stable idle than ever, though I did have to fiddle with my idle valve settings as it was idling high. Then for 90kpa I\'ve gone for 1 degree and 3 degrees at WOT. I\'ve made that 2 degrees and 4 for peak torque of 3kish and the gone for to 0 and 2 degrees above 6k.
Overall the engine seems a bit keener. Its running cleaner at light cruise and idle, especially where I\'m running it lean (16:1). I guess with 0 split it just means its got double the chance of igniting the mixture properly.
Next question then....
I\'m running premix, OMP is removed as I cant use 13b pump with 12a front cover. Because of this, in combination with my 2 stroke motorbike experience, I\'ve not activated the overrun fuel cut. I figured its not got for the seals to be spinning at high RPMs with no oiling. (The pops and bangs running a slightly lean mix on the overrun also sound awesome and make me feel like I\'m driving a race car
On the downside to even get a 17:1 AFR on the overrun@ 3k rpm I\'m using 8% duty cycle or so on the primaries. 8-10% is about the same as I\'m using cruising at 30mph in 4th. Idle is using around 4%.
I\'m doing all I can to try to improve my fuel economy as this car is my daily. Any opinions of the safety/non safety of using the overrun fuel cut?
Or any other tips for fuel economy? As I said in the previous post I\'m cruising as lean as I dare and I\'m using as little cold enrichment as the engine seems happy with.