cos 5 timing going to 0 at high rpms

[Highlander]

Sorry, wrong assessment... CHeck out TCS and zero out b6604 and try that.

[Highlander]

for some reason traction control could be kicking in in some way and/or clutch fuel timing cut off.... Not sure if ls1s had it..

[69camaro5speed]

If you look at the second tune I did that allready,This only happens when the nos is on every thing works then some times around 7600 it drops to 0 and car runs bad

[Highlander]

If you look at the second tune I did that allready,This only happens when the nos is on every thing works then some times around 7600 it drops to 0 and car runs bad

It drops to zero just for a split second, it regains its timing back one or 2 frames later!

Disconnect clutch switch as a matter of testing and check!

You need to log the plethora of pids for spark to see where its retracting the timing!

[69camaro5speed]

The ecm doesnt see the clutch switch it only goes to the lingenfelter box for the 2 step activation.
I am pretty sure theres no nos timing pid wish there was

[69camaro5speed]

Still having the problem with nos on only but still pulled this off at lsx shoot out new t56 6 speed record http://www.youtube.com/watch?v=p6xeBDaC4pc

[slows10]

Maybe some kind of bug/glitch in the cos itself?

[69camaro5speed]

It seems that way not many people run there stuff over 7600 with stock ecms and this set up we need 8000 rpms to make this thing rip

[etmotorsports]

I have never pushed the gm ecm's to the limit but i know from past experience with fords that was always the limit fueling and timing about rpm ranges depending on year, that was always the reason for going to aftermarket DFI systems. A/f and spark doing odd things about 6500 or 7500 rpms depending on the ecms.

[johnv]

How bigger a shot of nitrous are you running ? your pulling 13 deg timing when the nos tables are activated.