The Field SFC series is very similar
to the A'PEXi Super AFC (Gen I). The units basically do the same
thing: intercept and adjust the airflow meter signal to change fuel
delivery. SFC stands for "Simple Fuel Computer". I know of three
Field SFC units: SFC-Hyper, SFC-VTEC, and the latest SFC-HyperR.
Regardless of model type, they all operate the same way, and the DIP switch
settings are the same for difference model vehicles. Adjustments for all
SFC models are -30% to +30%. All models are ¼-DIN size units. All
AFC units have a rear ON/OFF switch to bypass the SFC if required (something
that is not possible with the A'PEXi Super AFC Gen I units).
SFC-Hyper was the first SFC unit offered by Field in Japan. Make note that
these units are designed for Japan-use only and not officially supported in the
U.S. It strictly designed for fuel adjustment functions. There were
seven RPM points - starting at 1,000RPM and incrementing every 1,000RPM up to
The SFC-VTEC was designed for the Honda VTEC (and Japan-only
Mitsubishi MIVEC) crowd with the addition of an adjustable RPM output to control
their timing systems. Field added one extra RPM band, so it was similar to
the original SFC-Hyper but went up to 8,000RPM. Internal circuitry is
similar to the SFC-Hyper with the exception of the VTEC signal output.
Added to it's basic fuel adjustment function was a programmable RPM warning beep
and a speed meter fucntion. Although obviously made for
Honda's/Mitsubishi's, this unit can be used on any vehicle that was supported by
the SFC-Hyper. I used to run this SFC-VTEC on my FC3S just because of the
extra RPM band with the same DIP switch settings.
Click here for Field SFC-VTEC web page!
The latest release from Field is the
SFC-HyperR model. This model packs a bunch of interesting features, and
like the SFC-VTEC, runs all the way up to 8,000RPM. You can save three
separate settings versus only a single setting on the older units. An O2
sensor input triggered RICH or LEAN indicator lamps. There is also a
multi-function speed/timer function that required you to tap into a vehicle
speed sensor. Speed functions include real-time speed display (in KPH) and
top speed record. Timer functions include 0-100m, 0-200m, 0-400m (short of
a ¼-mile), and 0-100KPH (0-62MPH) timers. RPM fuctions include real-time
RPM display and peak RPM record. I currently run an SFC-HyperR in my FC3S.
Click here for Field SFC-HyperR web page!
Questions? Comments? Send mail to: