MicroSquirt.com read only forum (Jan.15,2018)

I am lead to believe that most modern fuel inj systems have a fuel cut on overrun algorithm built into the program.
MegaSquirt (as far as I know) doesn't have this facility.
I would like to incorporate this function in the interests of economy.

My thoughts are as follows:

My engine runs with MAP setting from 25 kpa. to 100 kpa and idles around the 30 kpa region.
It only ever dips below 25 Kpa on overrun.
I figure that if I change my bottom row of bins to say 15 Kpa and enter a value of zero into all these bins then that will efectively give me fuel cut on overrun.
Can anyone see any problems with this.
The only one that I can see is that I will be running the map 12 X 11 rather than 12 X 12 due to "wasting" one row of MAP values.
I don't think this will cause undue problems as many ECUs run 8 X 8 anyway.
I think it will simply make my map a little "coarser"
The only other thing that occurs to me is: Do you need fuel on overrun to lubricate the bores?
I figure that if you have no fuel injected then the engine is simply acting as an air pump.
Constructive comments please.

You could do that. Or the feature is available here:http://megasquirt.sourceforge.net/extra/overrun.html

You do not want raw fuel in the cylinder as it washes the oil off the walls.

Thanks for that but I'm running MS II and as I understand it fuel cut is not available for the MS II code.
Sorry I should have said.

I tried it with the VE table, problem is it may make gearchanges harsh as the engine will slow down rapidly while shifting. It`s better to have it timed as well (I use 2 seconds before cuttind fuel to avoid the gearchange problems).