E38 N2O & Flex Fuel Spark Table

[Jester]

I have asked this a couple years ago with virtually no response so need to confirm if my assumptions are correct as obviously cannot rely on assumptions.

{B5114} Flex fuel spark. The description says "this table will alter the spark values from{B5101}. Does that mean it will subtract it from, or use whatever values I put in there or if I have 0.0, no changes from high octane or 0.5 it will use 50% from high octane etcc etc? So for example If I had 22.5 degrees in the high octane table @ cell 4800rpm and I had 2 degrees at that same cell in the flex fuel spark table it would subtract 2 degrees leaving me with 20.5 for that cell whilst I was spraying? or do I copy over my hi octane table to {B5114} and just reduce timing in my spray window?

This is using the E38 with the OS upgrade for ethanol 80 tables being used for n2o. Any assist appreciated.

[GMPX]

If you have a look at the allowed range those values can be you can go negative or positive numbers. Whilst it is true some spark tables will only allow positive numbers, in the case of this one you can subtract timing too.
Just make sure your B5145 table is set to 1.0 at the 80% cell or B5114 won't do anything.

[Jester]

Thanks Mate, still a little confused though.

Do I just copy of my high octane table and reduce timing in the spray window area? example: 3000-5600rpm .68-1.04 gs/cyl
or
put in negative values in the spray window cells, which get pulled from the high octane table? example: 3000-5600rpm .68-1.04 gs/cyl -4 dgrees in those cells that I am targeting? (using -4 degrees as example for a 100 shot) so in this scenario my B5114 shows 0.0 for all cells except for the spray window in the example which shows -4.0 degrees.

Maybe I should drop it into the E85 mode and log what happens with the timing to see exactly how that table works?