engine dies out after TC install
02-20-2007, 12:14 PM
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engine dies out after TC install Installed a new Vigilante 3200 TC and now everytime I put it in gear or come to a stop, my engine stalls out. This wouldn't happen with my old Yank 3000. I have LS1 edit and have tried raisng idle in gear but it didn't help. I even played with the the idle air flow tables a little but wasn't real sure which range to adjust. Any suggestions?
02-20-2007, 04:10 PM
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Log the dynamic airflow g/sec and see what airflow
the motor needs for the target RPM and accessory
load. It will change with ECT and IAT. Try to note a
few real-world points especially as it warms up. It
may be better to push the data to Excel, depending
on how you like to work. Easier to snag a particular
point for copy-n-paste.
Then set your base running airflow, for the observed
engine temps, to the actual values. This gives you a
pretty good initial guess for the sappy idle RPM loop
to converge on. Aiming high might be a better bet
than aiming low, then said sappy loop has to actually
work to kill the motor, not just take a nap.
Check out the Stall Saver stuff if you haven't, there
is a backstop but I recall it being set to far out as
to not be much help. Something like 100RPM below
target you want Plan B.
Make sure the throttle cracker does not have a
peculiar profile to it, it should fade smoothly to 0 from
all directions and no potholes or spikes. Mine and
some others' had these "0" holes that you'd have to
cross over and then a spike just before 0 MPH, etc.
That kind of jerk-around, your retarded little buddy
doesn't need.
the motor needs for the target RPM and accessory
load. It will change with ECT and IAT. Try to note a
few real-world points especially as it warms up. It
may be better to push the data to Excel, depending
on how you like to work. Easier to snag a particular
point for copy-n-paste.
Then set your base running airflow, for the observed
engine temps, to the actual values. This gives you a
pretty good initial guess for the sappy idle RPM loop
to converge on. Aiming high might be a better bet
than aiming low, then said sappy loop has to actually
work to kill the motor, not just take a nap.
Check out the Stall Saver stuff if you haven't, there
is a backstop but I recall it being set to far out as
to not be much help. Something like 100RPM below
target you want Plan B.
Make sure the throttle cracker does not have a
peculiar profile to it, it should fade smoothly to 0 from
all directions and no potholes or spikes. Mine and
some others' had these "0" holes that you'd have to
cross over and then a spike just before 0 MPH, etc.
That kind of jerk-around, your retarded little buddy
doesn't need.
