Apex'i S-AFC Installation
by Clemens
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This write-up describes how to install an Apexi S-AFC (Gen1) on
a 94-95 Toyota Celica (5S-FE). It may work with other generations,
but you’ll have to figure out the wiring yourself.
Basically what the S-AFC does is alter the voltage the ECU receives
from the MAP sensor. This causes the air/fuel mixture to either
go leaner (-) or richer (+).You can adjust in increments of 2%.You
can fine-tune the mixture at different RPM points (800rpm, 2400rpm,
4000rpm, 5600rpm, 7200rpm).Obviously the last setting is not used.
The ECU won't use the values of the AFC while in closed loop mode
(under 80% throttle). But when you step on it (when racing), the
ECU goes into open loop mode, ignoring the O2 sensor and only relying
on the MAP sensor for data. So the Gen1 AFC is only usable under
WOT (Wide open throttle) situations. I don’t promise huge hp
gains, but with Intake/Header/Exhaust and correct tuning, you’ll
get a few more horses!
Tools
Needed:
- Apexi S-AFC and harness
- Wire taps/connectors
- Wire stripper/cutter
- Multi-meter
- 10mm socket
- ECU Diagram
- 3-4 hours of patience!
You can also download the actual manual from the Apexi website:
http://www.apexi-usa.com/productdocunt
ation/electronics_afc_gen1.pdf
On to the Installation....
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