Piggyback Install

   Last month I purchased a used Greddy Emanage Ultimate and Boomslang harness and I finally had some time this week for the install.  Because the piggyback controller alters the OEM computer's code, I paired it with the original BP4Y California ECU instead of the modified DPTune ecu (BP4W).  The stock ecu is located under the driver side dash above the clutch pedal and there is just enough room to comfortably connect the plug and play harness and enough length to reach across to the passenger side dash.

   I found a nice area behind the glove box to mount the piggyback unit and fabricated up a small bracket to securely mount it to the firewall just past the air duct.  Loading the software and choosing the correct driver is all it took to get the EMU active and Vehicle Type and Throttle are the only two parameters that I needed to configure at this time.  I do have a CEL for knock sensor P0325 which is a known Greddy EMU issue for this application and apparently cannot be addressed via software or jumpers.  The CEL does not affect the car's performance and the forum at miataturbo.net says the solution is to simply cut the knock sensor harness wire, which turns out to be the blue/yellow stripe wire #2 in connector C.  Also some concerns in internet land about the cooling fan(s) not turning on, but my Torque App verified the fan kicks in at 204*F (96C).

   The ignition and injector tuning maps are currently all set at zero which means that there is no deviation from stock.  All other engine parameters are still controlled by the stock ECU so the car idles and drives as normal.

Jumpers are set to the following positions:

JP1     open
JP2     open
JP3     open
JP4     open
JP5     open
JP6     open
JP7     1-2
JP8     2-3
JP9     1-2
JP10    open
JP11    open
JP12    open
JP13    open
JP14    open
JP15    1-2
JP16    open
JP17    1-2
JP18    open
JP19    1-2
JP20    1-2