yes... great write up. this will me a lot.


Good job....

 

Car is now idling at 900rpm +/- 15rpm. Super solid and steady any temp, any AIT. I have been slowly making my way down, really dialing in each 100rpms.

Best idle thread ever .

 

So how do we get a sticky for this thread?!?!?!?

 

I wouldn't worry too much about this getting buried. There aren't usually a whole lot of post in the AEM section. Although it would be nice for this to be a sticky.

I've got it bookmarked in my browser so I never lose it.

 

subscribing... this should be a sticky...!!!

 

This is brilliant. Thanks so much for this write up. I used it to tune the idle on my 91 Supra with 750 cc injectors and GT35R turbo. My idle is rock solid now. I've been fighting stalling issues and messing with the idle settings on the AEM EMS for two summers now. I spent 45 minutes working with your instructions and it totally fixed all my problems. Thanks again.

 

^^ BAM! 1 more AEM with correct idle! Glad i could help.

 

Spent some time on another evo IX with this last night. Decent results. Needs a bit more time. But I could tell this is on the right path.

 

Did the procedure now ac compressor clicks on and off really quick and it wants to stall.it was working fine before.

 

Out of curiosity, should the values for 75 and 100 to 300 actually be negative or do they switch to positive at those breakpoints?

 

YES!!! Sorry guys i must have been getting sleepy and i slipped......

NOTE: The ignition offset values in my original post have ben corrected. Thanks Masternater!

Gordian, Make sure you have the tps sensor setup as i described in the first post.
If the engine wants to stall when the compressor comes on raise the "ac clamp load" % until when the compressor comes on, the rpm does no drop below your target idle rpm.

 

getting my AEM tomorow.... ill deff be trying this

 

Ignition offset curve helps, but fine tuning the duty feedback table makes a huge difference. Set the target idle at 500 rpms and watch the idle feedback correction %. Add or subtract that % to your idle base duty table at that particular rpm point. Increase the target idle rpm by 100 and retest. Continue until around 2,000 rpms. This will make feedback about perfect.

 

^^^ Correct! It is actually best to have a idle feedback # in the negative, meaning the ecu is taking away IAC duty cycle. This encourages a higher idle when the throttle is released to help prevent stalling. Works very well with big cams and a low idle where stalling seems to be the biggest problem.

 

AMAZING summary. Very impressed. +1