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Vacuum hose
Route vacuum hose from engine intake manifold through the firewall to the
CPi2 ecu. Supplied hose is silicone be sure it fits tight onto the intake fitting.
Dual board units will need a “T” fitting near the ecu to split the vacuum signal,
as only 1 hose is needed to the engine, and the vacuum signal is not essential
to keep flying. If you have no central vacuum port on the intake or throttle body,
you could connect the hose to primer port fittings close to the cyl head but use
at least two ports to get a smooth enough signal. Use a grommet at the firewall
and keep away from exhaust heat. If using an automotive throttle plate, best
not to connect to the throttle body unless you are sure the vacuum port
channels down below the throttle plate. On some throttle bodies the vacuum
port may route to just above the throttle plate when closed and the vacuum
reading will be lost at closed throttle.
Audio connection
Connect the supplied 1/8” stereo cable to your audio/mixer intercom aux input. There is a test mode for audio so
you can set the volume, this is explained elsewhere in this manual. Audio will only come out 1 side of your headset.
It can be made to come out of both sides, L and R, with a jumper installed inside the ecu, email us if you need to do
this. For dual board ecu’s, just connect your audio cable to the Primary ecu(closest to the lid). A fault in the backup
will be relayed via the Primary. In the event the Primary board is dead there will be no audio warning. You could
connect the Backup to your audio system if you still have an extra audio input available.
RS232 connection
This is an optional item upon purchase. You can connect the CPi2 to a windows PC USB port to log data. We have
a custom cable manufactured for this application. If you don’t have this cable, you can order it by contacting us via
email or phone. 403-671-4015 or
. You cannot program the CPi2 via a PC at the present time.
Logging can capture up to 4 hours of data, RPM, timing, voltages, manifold pressure etc. Also Logging will
download all the settings in the CPi2 so you can view and print them.
On dual board ecu’s you can connect the cable to either Primary or Backup boards, whichever is of interest. On dual
board ecu’s currently the PC logging will only download settings from the ecu board that the cable is plugged into,
but a future version will download settings from both boards. This will take more development time.
ECU Fuses
In the photo showing the dual board ecu, the left side fuses are for
ecu power and rating is 2 amps. The middle and right side fuses
are for coil pack power, rating is 10amp. Fuse type is Blade Mini.
The single board ecu only has one cpu fuse and 2 coilpack fuses.
The 2 amp will blow if the internal crowbar activates when mainbus
voltage is above approximately 25 volts. Coilpack fuses are there
as extra defense to protect the switching circuits in the CPi2.
