Improving shifts via the ECM

[Tre-Cool]

i use 5 degrees of timing in mine in the low end of the table for firm shifts down low, However i have negative 6 degrees in the top end for shifts.

negative timing seems to work better for quicker shifts anyway.

[Jason S.]

i use 5 degrees of timing in mine in the low end of the table for firm shifts down low, However i have negative 6 degrees in the top end for shifts.

negative timing seems to work better for quicker shifts anyway.

5 degrees won't get me near where I want! Currently the ECU is pulling 40 degrees down to zero of advance.... I would want no more than 20 to be pulled, so I would have to put my mins at 20 for that to work at light load...no good.

[Tre-Cool]

u dont understand the table.

if you put in -6 degrees in the minimum timing table. the ecu can not go any lower than -6. so if your seeing -40 now. it will hit the "wall" at -6. it's not a -40 +20 = -20 degrees equation.

B5153 Power Reduction Minimum timing in my e38 is set to -10 degrees for the whole lot
B5157 -Minimum Final Timing=
Goes from +6 to -10 after 0.72g/cyl

[Jason S.]

u dont understand the table.

if you put in -6 degrees in the minimum timing table. the ecu can not go any lower than -6. so if your seeing -40 now. it will hit the "wall" at -6. it's not a -40 +20 = -20 degrees equation.

B5153 Power Reduction Minimum timing in my e38 is set to -10 degrees for the whole lot
B5157 -Minimum Final Timing=
Goes from +6 to -10 after 0.72g/cyl

I have -15 in B5153, and -25 as the largest in B5157. So if that were true...I would never get more than 25 degrees pulled (because that is the largest negative number in B5157). Yet, I am getting 40+ pulled...so what am I missing?

[Tre-Cool]

what b5156 or alternativily post your tune files and i'll take a look and see if anything stands out.

[Jason S.]

Jasons CTSV_E67_Tune4_NoBurstDoubleKnThresh850cc_TQ Reduction_timing_Coefficient5perc.tun Here you go.

what b5156 or alternativily post your tune files and i'll take a look and see if anything stands out.

[Tre-Cool]

well it all looks good. i have put the settings that i use in from my e38, so see how it goes.

GM certainly likes to run some timing in those motors. knock sensors are seem pretty relaxed too. i run forged pistons in my ls3 block and my knock threshold numbers are at 6 for all mg.

Jasons CTSV_E67_Tune4_NoBurstDoubleKnThresh850cc_TQ Reduction_timing_Coefficient5perc_0000.tun

[Jason S.]

well it all looks good. i have put the settings that i use in from my e38, so see how it goes.

GM certainly likes to run some timing in those motors. knock sensors are seem pretty relaxed too. i run forged pistons in my ls3 block and my knock threshold numbers are at 6 for all mg.

Jasons CTSV_E67_Tune4_NoBurstDoubleKnThresh850cc_TQ Reduction_timing_Coefficient5perc_0000.tun

What all did you change, so I know what to look for?

[Tre-Cool]

do a compare, but it's mostly the reduced power spark and minimum timing tables.

[Jason S.]

do a compare, but it's mostly the reduced power spark and minimum timing tables.

O.k. will do! Thanks! I'll let you know how it does.