I knowwhat the manual says, but on lighting website a few guys mentioned 850 is the stock idle. I also rememebr in vacuum polls people syaing they were idling at 850? what is the deal? oh btw I am only concerned witha no-load warmed up idle. Min i sset at 720 juts liek manual and PFC come with.

 

Dood, i can't get my car to idle at 720 for the life of me!!!
It's always hovering around the 900 range.

does porting of engine make a diff?

 

PFC won't idle your car, or didn't for me until awhile of driving. Yes porting can have to do with it, but I am thinking it would takea huge port job to have to idle the engine around 900. Regardless of port size the control system shoudl allow you to idle it that low, but maybe you are just falling off if you have a large port. I really don't know my port is stock.

will someone please help me with air pump questions, is seems eveyone I talk to either has air pump in car, or ACV removed, but never no air pump with acv still working.

 

Mine will idle lower than 720, but with my 8lb aluminum flywheel, it is better to have higher revs to help prevent stalling. Also, since the PFC does not control my AC, I need to have the revs higher to compensate for the extra load when my "bypass" AC control circuit turns on the AC.

 

well, my port is pretty big and my flywheel is 8.5lbs.. so i guess it's ok that i'm hovering at 900 then huh? :\

 

Engines with large ports will require a higher idle due to the lower intake vacuum. But there are other factors: position of the idle set screw, position of the air adjust(bleeder) screw, TPS positions, air pump or no air pump, O2 sensor condition, fuel setting in the INJ or PIM maps, and if the air hose for the primary injector air socket is installed.

 

what is that chuck?

 

The stock "Y" pipe has two control like hoses going from the outlet. The smaller one goes to the pressure tank. The larger ones goes into the middle of the lower part of the intake manifold. From there it goes into two small holes in the center housing. Each of these holes go into the primary intake ports near the injectors. Can't remember if above or below. Hey I am over 50 and the memory isn't as sharp as it use to be.
Ha ha!

In essence this path supplies a small amount of air (not controlled by the throttle or any of it's control systems like ISC AWS). At open throttle this amount of air is negleable, but at idle it helps to smooth out minor
air fluctuations cause by the ISC or minor throttle chnages. My idle is controlled better with my hose working as compared to it not working. I have tested it both ways. Also helped reduced the famous wandering
idle.

 

thanks for the explanation! I was trying to figure out where that thing went, I just replaced the seal on it when installing my efinit y-pipe