Authorized TD Vendor
Join Date: Dec 2003
My Ride: Spirit R/T
Engine: 3L V6
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Re: My v6 Drag Week build
I have wanted closed loop idle so I could have a fairly consistent idle speed regardless of load on the engine (ie. electrical load.) Then a secondary reason developed over the holidays, during the drive into work the idle speed slowed down at each intersection. I had to manually change the IAC step curve to avoid the engine stalling.
Spent some time today trying to understand why I couldn't get closed-loop idle speed control working. Turns out I had the IAC wired the opposite of what it should be (ie. As the engine warmed up, iac step counts increased.)
The algorithm assume that the IAC count decreases to reduce RPM. Switching the wires around and the IAC count direction agrees with the algorithm. Still need to tune PID in a little more, but I am happy so far.
3L V6 Guru and all around FWD Mopar fanatic
'91 Dodge Spirit R/T turbocharged 3L V6, exhaust turbo header, ported intake, stage 2 ported heads
'87 Dodge Shadow turbocharged 3.5L 24-valve 6g74. 12.3@122