Originally Posted by HwAoRrDk (Post 4892973)

What's up, guys? Thought I would share here a little something I cooked up recently that may prove interesting for anyone with a GOODbox and a boosted RX-8.

It's a small adapter circuit board that replaces the on-board boost pressure sensor such that an external, remotely-mounted off-the-shelf GM 3 Bar MAP sensor can be used instead. So instead of having to run a vacuum hose all the way from the engine bay to the GOODbox, just wires can be ran instead. The on-board sensor is de-soldered and this board is soldered on in its place using pin headers (the 6 holes match the pin-out of the on-board sensor). Wiring to the external MAP sensor is soldered to the three labelled points on the opposite side (like the GOODbox's Aux inputs).



The output of the GM MAP sensor is scaled to match that of the old on-board MPX4250A sensor as closely as possible. It should be within 1% across the pressure range. Note that it doesn't magically allow boost readings of 3 Bar just because the GM sensor goes that high! It will still only read up to 2.5 Bar, as it has to match the output of the old sensor (which goes to 250kPa, or 2.5 Bar) so that the GOODbox firmware can interpret the reading correctly.



Also, because the signals and power for the boost sensor are now going off-board, the adapter also features some protection for the 5V reference output. Current output is limited to approx. 60 mA in case of short-circuit to ground (or maybe faulty sensor). The 5V line is also protected from over-voltage (e.g. short to 12V), and will be automatically cut off if an over-voltage condition is detected. So nothing should blow up in case of wiring fault or incorrect connection. :)

Attached here are a circuit schematic PDF and PCB manufacturing files (Gerbers) in case anyone wants to make one themselves.

Originally Posted by Paintballny (Post 4986474)

Any chance of this ever coming back?