So I thought a good way to pull timing on a car I'm tuning would be to run a ground wire triggered by a relay to the tcs timing retard pin at the pcm. Everything works perfectly, until 5900 rpms, at which point the timing that is being pulled goes away and timing is logged as the same timing as is in the main spark table.
The ground supply to the pcm has been verified for the entire run....much higher than the 5900 rpm cut off on the log. Does this method of timing retard for nitrous simply not work? Is there a time limit that the tcs retard will function?
I have it set to pull 8 degrees of timing but at 5900 rpms the retard goes away like clock work.