How does the Spark tables work together?

[gpr]

Working on tuning the car a bit more and was wondering how the spark in gear table works in conjunction with the high octane spark table? When is either used and how does it switch from one to the other? I noticed this weekend at one point in the tune I thought it would be from the Hi octane spark table, but the value was much to high so had to be from the spark in gear table.

BTW I'm using COS 5 not sure if that changes it any.

[joecar]

B5916 and B5917:
if both of these are met then base spark PN and IG are used;
otherwise if either one is not met then HO/LO adaptive spark is used.


COS5: if MAF DTC is present, adaptive spark still functions (slides between HO and LO based on KR).

[Wheelz]

Don't forget there are iat modifiers and ect modifiers that can/do advance timing in cooler temps that will make your timing read higher than the high octane table.

Joecar, doesn't the adaptive spark scaler still function with a MAF dtc on COS#3?

[joecar]

Yes, correct, adaptive spark functions in all COS's (with or without MAF DTC).

[gpr]

So either one or the other values for B5916 and B5917 have to be met, and then it switches over to Hi Octane Spark Table? Or do both values have to be met?

[gpr]

Also how does the table B5919 optimal timing play into working with the rest of the tables? For some reason during the log my timing shows in the Hi Octane table a value of 13, yet the actual timing in the logs is 23 on its way down to 13. I'm just wondering why it is like this. the ECT and IAT tables aren't set to modify it at this position either, so I only see optimal timing table being used.

the timing it is running at is okay, I'm just wondering what is affecting the values and how it pulls the timing down to the hi octane table (as i used the high octane table to pull timing down in boost)

[joecar]

Optimal Timing is not used to command actual timing... but rather it is used as a reference in various calculations.


Post tune file and log file with frame bookmarked where this is happening.

[gpr]

I made a dumb mistake.... Was logging grams/cyl and looking at tune in oz/cyl. ooops

now it is matching up

[Wheelz]

That will do it and is easy to do

[joecar]

ok cool


( always check units of logs/pids, maps, tables )