cos 5 timing going to 0 at high rpms

[69camaro5speed]

Looking for help has anyone seen this happen car doesnt do it off the nos.
IT will pull timing to 0 around 7600 rpms.

Doesnt do it off spray this is a very fast 6 speed car if we can get every thing working with nos it has a chance at being the fastest 6 speed car.
Here is couple logs one with some bent valves(didnt like wot 2,3shift off big wheelie after it recovered from clutch draging it down), 9150rpms 418 inch 6.0

[slows10]

If this is a cos tune then post it up. What are we supposed to be looking at in those logs. Lots of tables could be causing issues. Log with some spark pid tables. Something to do with the cos tables I would think.

[slows10]

What is the engine setup what cam? I think 8000 rpm is the limit if the ecm, unless a cos is different.

[69camaro5speed]

If this is a cos tune then post it up. What are we supposed to be looking at in those logs. Lots of tables could be causing issues. Log with some spark pid tables. Something to do with the cos tables I would think.
Remember its fine na 31 degs timing 20 passes,here is tune for first and second log

Its 8000 rpm max thats all it needs to run,really done around 7600 just 8000 in lights to max its et.

[L31Sleeper]

What is the engine setup what cam? I think 8000 rpm is the limit if the ecm, unless a cos is different.

You are correct, however the ECM will continue to use the closest value
regardless how high the RPM goes. I would shift at 8500 or look into
an aftermarket ECM ( Motec, FAST, BigStuff 3 )

-Justin

[69camaro5speed]

[QUOTE=L31Sleeper;155610]You are correct, however the ECM will continue to use the closest value
regardless how high the RPM goes. I would shift at 8500 or look into
an aftermarket ECM ( Motec, FAST, BigStuff 3 )

-Justin[/QUO
no need to shift at 8500 when we shift at 7600

[L31Sleeper]

Sorry I was still typing when you posted last.

-Justin

[L31Sleeper]

Are you sure it's not a glitch in the log ?? This might sound dumb but try
logging just timing and RPM. That way you will get the highest frame rate
for those parameters.

-Justin

[69camaro5speed]

every things works great except revlimiter slow and the mistry 16 degs timing being pulled lol

[69camaro5speed]

car misses when it does it,we are logging though v2

[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.

[69camaro5speed]

Problem fixed thanks Ross for your help, Its a wet kit we where being little safe its only like a 225 shot

[joecar]

Problem fixed thanks Ross for your help, Its a wet kit we where being little safe its only like a 225 shotWhat was the fix...?

[69camaro5speed]

What was the fix...?

change he made that i couldnt see guess it was in code

[TFZ_Z06]

change he made that i couldnt see guess it was in code

interesting. I wonder if I need to update.

[69camaro5speed]

interesting. I wonder if I need to update.

Only If your spining It over 7600 rpms much thats the only problem I had, timing would drop to 0 the closer to 8000 we got

[TFZ_Z06]

Only If your spining It over 7600 rpms much thats the only problem I had, timing would drop to 0 the closer to 8000 we got

7000 here, but strange enough my datalog was showing 2 degrees less spark than I would have expected.
In my case IAT and ECT have no affect since IAT=0 and ECT retard is only above 230F. I have been meaning to log spark smoothing and see if thats it.

[69camaro5speed]

7000 here, but strange enough my datalog was showing 2 degrees less spark than I would have expected.
In my case IAT and ECT have no affect since IAT=0 and ECT retard is only above 230F. I have been meaning to log spark smoothing and see if thats it.

Ours would go to 0 over 7600 on nos only na was perfict every time