Field AFC on a rotary?
 

Does anyone have experience installing/using a Field brand AFC??

Since they are also a VTEC controller, I'm guessing you'd have dealt with it on a Honda/Acura.

I am wondering if it is possible to control fuel in 2nd gen (series 5) using one of these?? I briefly had a chance to look at the wiring scematic the other day, and think it **might** be possible.

There are dip switches in the back that can be set for different appicatins, apparently.

I'm also thinking about how the Apex S-AFC is a universal unit designed to work with many cars- instead of dip switches, you set the type of air flow sensor. I **think** on the S-AFC, honda/acura and rotaries are set the same in regards to that parameter....

Anyway, as my rebuild nears completion, I am researching a way to control my VDI electronically. One of the easiest ways to kill two birds with one stone is to use a fuel/VTEC controller, with the VTEC changover output being used to control the VDI, probably through a simple relay/solenoid circut.

I am open to using the Apex V-AFC or the Field unit, but it jsut seems the Field unit is a better choice becaus of cost and its compact size.
So give me your input and maybe we'll break some new ground here...

Shawn

I dont know all that much about them but I imagine that if your car has a MAF sensor (which it does) you should be able to make it work.

Here is what I'm referring to, in case people weren't aware (see attachment):


I am pretty confident the fuel control portion will work on a rotary (especially the V-AFC), but need to find out more specifics on controlling the VTEC switch-over points.

From my understanding, once oil temp/pressure reaches a specified level in a VTEC engine, the VTEC solenoid can then be actifvated, causing the higher cam to come on-line.

What I would like to know is:

Does the VTEC controller send a positive or ground signal to the soleniod in order to activate it?

I'm running a Field SFC-HyperR.&nbsp If you need help, just ask...



-Ted

Of course, someone has already done it... so much for being a pioneer, sheesh :p:

Actually, Ted, that is great news! I do have some questions:

How did you set your dip switches?
Will they be different for a N/A vs TII?

Would be interested in how it adjusts fuel..
Does it only make AFM adjustments at partial/full throttle? I believe the Apex unit can be programmed for part AND full throttle maps??

Under low/no load conditions, will the factory ECU's closed loop operation take over?



Shawn

I was actually using a Field SFC-VTEC before, cause it had one extra RPM adjustment over the regular SFC-Hyper.&nbsp The newer HyperR came out, so I replaced the SFC-VTEC cause it has the same 8 RPM bands. :)

8DIP bank - all UP/off except #2 and #4
4DIP bank - all UP/off

This should work for turbo or NA.&nbsp It should guarantee work for the 1986-1988 Zenki FC's, and it might work for the 1989-1991 Kouki FC's also.

The Field SFC units are adjusting at all times.&nbsp So your adjustments affect fuel delivery all the time.

Yeah, factory ECU closed-loop still works.&nbsp Adjustments are moot, as the closed-loop adjusts the fuel delivery anyways.



-Ted