I'll be running an '8746 ECM with a 454 throttle body.
It seems that the 454 IAC has different steps than the 305/350 IAC. I know others have used 454 IAC's with this ECM, how did y'all recalculate the steps for the IAC? Does anybody maybe have a TunerPro/TunerCAT table that they'd be willing to share?

Thanks
Lou

 

I used 0-80 steps to end up with a cold high idle of around 1200 rpms. Car is driven only in temps above 35 deg F. 350 CID.

 

What did you use for the following constants?
IAC - Park position steps
IAC - Steps added to low BatV
IAC - Max steps added low BatV
IAC - Max throttle follower steps
IAC - Max steps

Thanks
Lou

 

I am at office so will have to inspect bin when I get home. I have manual trans. I will guess however!

Park zero steps or use stock bin values reduced 40%
low batt maybe 5 additional or as above
" max I dont know or use stock bin as above.
max throttle follower maybe 2 steps or stock as above
Iac max 70-80 or so.

I never had issues with stall on cold start. So I prefer a low idle rpm on cold start. same on restart warm engine. when engine starts it goes right to idle speed with no flare up in rpm.

 

Alright, thank you for the answers.
I pulled what I could from the ANTY bin (454ci with '7747) but I'll have to play it by ear when I'm ready to start the beast up.
The low-rpm startup is a good idea, I'll have to try that, now that I know (from you) that it works fine.

Thanks
Lou

 

When I first added IAC control on thr 7.4L TB I had stock .bin settings. Cold start the car roared in driveway at 2000 rpms(duals with hooker aerochambers). Not good for condo neighbors. I ended up dropping it 20 steps at a time till I found what I liked. I was also able to adjust the deacy rate so hang time was diminished on warm start(>160 d F).