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Fuel Management Systems:
With the addition of the turbo the engine wasn't getting enough fuel. There are a few different
ways of resolving this issue. A Rising Rate Fuel Pressure Regulator is one option, adding a 5th
injector or going to a stand alone fuel management system. The RRFPR I decided would only be a
temporary fix. I don't yet want to go to a stand alone system due to the work involved to get
it set up and tuned correctly.
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SIC Controller:
The SIC is a controller that uses signals from the ECU to control when and how long to fire a
secondary injector. Multiple injectors can be controlled by this, but I only needed one. Software
run from a loptop is used to setup and configure the SIC. The settings are then loaded to the SIC.
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Installation:
As usual the instructions sucked. I did a number of back and forth emails to 034 with clarification
as to what the instructions meant. Later on I joined Motorgeek.com's forum which is headed by
034 and got all my questions answered there.
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There were two main things to do to get this installed. Wire up the controller, which I had
much trouble with and welding on the injector housing. The wiring might have been a little
easier if their wiring diagram was a little more detailed. There were 16 wires some of which
weren't used. Although they didn't mention which ones weren't needed. After figuring out which
wires I was to hook up I had to figure out where they were to hook up to. Power and ground were
simple. One of the two wires going to the injector needed to be the correct impedience, which
that took a round of emails/forums to figure out. The most difficult by far was what was to
be used as a trigger source for the injector to fire. An RPM signal was the best and the most
accurate, but I needed make sure my RPM signal would work with the SIC. Enter round two of
email/forums. Eventually I got the answer I needed and my RPM signal would work. Now I could
wire up everything else and begin work on the injector housing.
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Because I was only using one additional injector it needed to be some where before the throttle
body so that the fuel would be evenly mixed in the 4 cylinders. The air intake tube from the
turbo kit was steel and a good place to weld to, but I needed to position it in a way it didn't
hit other engine stuff. With the injector now in place I could fire up the engine and connect
the controller to the laptop.
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This part was far more difficult than it sounded. I couldn't get the laptop to connect to the
controller. I went through another round of emails/forums, but was unable to get it to work.
I was about ready to think the controller was bad and would have to send it back when my dad
discovered the ground wire had been connected to +12V. After that was fixed it connected just
fine.
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Testing & Tuning:
Testing was done by using a general setup file configured slightly for my situation. An A/F Ratio
meter was used. The software used a 8x16 graph which was boost vs. RPM signifying how long
the injector should fire at each point.
Click here to view the dyno run results.
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