trying to install an apexi neo afc. i have the following diagrams and i just want to make sure im doing this right according to these diagrams any help would be greatly appreciated. im pretty sure the 92-95 sc300 and sc400s have karmen type mafs (im driving a 95 auto) (i read this in a thread created by carfreak70 he was putting in a safc 2 https://www.clublexus.com/forums/per...ion-sc300.html ). anyways heres the diagrams and how i think the wires go, if there right let me know if not just go ahead and correct me lol...any help will be appreciated. ( i know inthe install guide from apexi it says use t8b, but from what i read its wrong)

heres the karman diagram from apexi for the neo



here are the ecu pinouts that i was able to acquire from searching.



heres how they go i believe, if not please correct so i dont blow anything up will be attempting this tommorow.

red------------------ig power -------------- pin 31
red and white--------ig power -------------- pin 31
green ---------------rpm--------------------pin 58
gray-----------------throttle signal----------pin 43
brown----------------ground
black-----------------ground
brown and white-----karmen signal output--- pin 66 towards ecu
black and white------karmen signal input-----pin 66 away from ecu
orange --------------illumination power------ any interior lighting source???

thanks CL
-David

 

That seems to be correct. As for orange, if your not concerned with dimming it with your interior lights, just find an aux. 12v switched power source such as the cig lighter.

 

Does this mod really help/make a difference?

I was told that our ECU's are self learning (adjust to your driving style) therefore cannot ever really be "tuned"

any insight on this?

 

im going NA-T thats why im using it, nothing crazy though just a daily driver.... for now

 

Hey, thats how I started out. Trust me you wont be disappointed one bit. As for the ecu being self-learning, not too sure about that being odb-1. My ecu responded just fine to my afc controller, only issue I had was the bov venting to atmosphere, car would go pig rich and stall, but I did manage to "tune" that out.

 

Correct me if I'm wrong but don't self learning ECUs generally have a pretty small range in which they can actually adjust things. Something like the Neo will give more flexibility.

 

Yes you are correct, but "self-learning" ecu's will also compensate if they feel something isnt correct, such-as odb2..which anyone who is odb2 and tried to use an afc controller will tell you is a PITA.

 

any other na-t guys wanna chime in on this?

 

just ordered my neo for a basic na-t as well.. let me know how it goes

 

These air fuel controllers are great when the car is in open loop mode and the o2 sensors aren't doing anything, such as in wide open throttle

 

will do

can u elaborate on this open loop mode? thanks

 

A car is in open loop when the ecu does NOT receive any feedback information. In this case, when the ecu does not make adjustments based on the O2 sensors.

The only time the car runs on open loop mode is usually on first start-up and the o2 sensors are still cold, or during hard throttle when closed loop feedback isn't fast enough to do any compensation.

The main reason a lot of people say these air fuel controllers don't work is because they're using it the wrong way. They WONT work on low throttle where the O2 sensors are actively telling the ecu what the "output" of the engine is like. At this point the engine auto-corrections anything you did. But they work VERY well when the O2 sensors aren't contributing. (Such as in hard-throttle)

Hope I could help.

 

so those this work the same way with both obd1 and 2 ecu's?

 

Yup, they should work the same for obd1 and obd2. I have one on my 96 obd2.

 

Ok so from what I'm understanding from this all, is that its most beneficial at higher RPM's and after the car is warmed up...

scviolence, what kind of performance enhancements are you looking to achieve? have you heard/ seen proof of numbers increase? I had a AFC, and sold it due to the lack of solid claims.

Any better gas mileage at least?? LOL

Good luck with the install, if nothing else at least it'll look cool...=P