Timing over 1.36 cyl air mas?

[tonyvette]

I just did this per Sultan's suggestion and it helped a lot!
Go to your high octane spark table and click on the words "cylinder airmass" on left side of table. Another table appears allowing you to modify your g/cyl values. I started at 1.00 and ramped up in .05 increments (instead of .04) to show 1.05, 1.10....1.45.
1.44 g/cyl is the max I've seen on my truck at 8 psi so you'll obviously have to modify in larger increments (.06 or .07) or start modifying sooner (0.88-0.92 g/cyl) or both.

Hope this helps 02ls1
And much thanks to The Sultan!

[wetcoast]

change the axis on your timing tables High or low and it will automatically change all other tables.

Whoa! That looks scary if you're not careful. When you adjust the axis all the spark values stay the same as the previous cell contents.

e.g. If you adjust your scale to a maximum of 1.80 g/cyl and interpolate between the lowest cylinder air mass and the new maximum the cells stay the same.

So if 1.36 g/cyl at 6000 rpm was 15 deg of advance previously, after rescaling the axis 1.80 g/cyl would have 15 deg of advance and 1.36 g/cyl would be somewhere in the middle of the original table with a much higher spark advance.

To do that correctly it looks like you would need to copy all the data from 1.36g/cyl and below into the new adjusted table and create new values for everything above 1.36 g/cyl.

[SultanHassanMasTuning]

when rescaling the timing axis, its only common sense to redo the timing (lower) in the upper airmass regions

[tonyvette]

when rescaling the timing axis, its only common sense to redo the timing (lower) in the upper airmass regions

YES! Should have mentioned that in previous post.

[10_SS]

Can you simply change the last 2-3 columns to 1.5-2.0? This way the main spark table doesn't need to be reworked? Plus you keep the resolution down low. Or does this cause problems?

[LSxpwrdZ]

The ECM is smart... The table will interpolate between breakpoints. So for instance if you are pulling 1.5 g/cyl on the logger and your table is setup so that it goes from 1.40 g/cyl to 1.60 g/cyl breakpoint and you have 15deg in the 1.40 g/cyl cell and 11deg in the 1.60 g/cyl cell it will actually command a base of 13deg which is dead center of those two breakpoints. Now obviously from that point you have AFR, IAT, ECT and other corrections or multipliers that will manipulate the final delivered timing value but thats how the main spark table works.

[2012LS3Vert]

So is this one way of working around the timing limits on an E38 instead of scaling the tune? The ECM in my car will accept an 127lb injector, and read above 512 gm/sec, but I still thought that scaling the tune was the only way to control timing over 1.38gm/cyl. I'm getting close with my current setup, and if I install headers and cam I'm thinking I might exceed that. Is the only drawback of doing it this way is losing resolution in the timing table? Or am I just a dummy who misunderstands this whole thread.

[02Ls1]

So i edit the airmass axis to read 2.30 g/cyl, My log shows what happen to the timing table.
One thing was that on my Histogram Display timing table just shows to 1.36 g/cyl and at idle, cruise and WOT timing only reads at 1.36 g/cyl.

[SultanHassanMasTuning]

^looking at your actual chart display your hitting 2.14 or so and dropping to 1.8

log torque management and see whats going on

[02Ls1]

Yes I seen that the max it goes its to 2.43 I think.

What you think about the cruise mode that the timing its only showing at 1.36 g/cyl?

Did i edit the airmass axis right? I will check on the torque management.

[SultanHassanMasTuning]

^your cruising on the logs are between .20 and .25 looks normal