Hi all, managed to get in a few hours today on the Firenza and got stuck into mounting the Megajolt ecu. Like the Edis,I was keen to mount it unseen under the dash but have enough access to connect the data cable to upload maps and tweek them. Again I used 6mm nylon sheet to make a mounting panel,it's light and easy to machine and I happen to have some kicking about in the garage.
My Megajolt is a V3 fitted with the option of a map sensor. You can have them fitted with a throttle position sensor as an alternative,but previously on the Mini I found the map sensor easier to work with.
After heating and bending the nylon to the required shape, I fitted it with captive threads and bolted it to the underside of the passenger side dash just under and to the rear of the lower parcel shelf.
In this view you are looking at the molex plug that sits one end,the data connector is on the opposite side. From left to right,blue is the tacho output (also an output on Edis if this one does not work with your tacho),grey and yellow are the pip and saw wires which carry signals from Edis and the commands from Megajolt back to Edis,red is as you might imagine power+ and white is the earth wire. To the right of the molex is the vacuum pipe pushed onto the map sensor fitting.
As I've mentioned previously I've connected the coil to the ignition key switched 12v feed coming from D5 in the factory fusebox. To provide switched power for Edis and Megajolt I've fitted this arrangement under the dash on the drivers side.
It's a double make/break relay which switches power to two independant circuits and conveniently the bracket in which it sits has built in fuse holders. Top (pink) fuse is the 3amp protecting Megajolt,middle is the 15amp protecting the relay itself and bottom is the 15amp protecting Edis. The reason for fitting the relay is so I can trigger all three components of the system from D5 without putting excessive load on the old wiring. The relay trigger is tapped into the D5 wire. The relay power feed comes direct from the battery.
Back in the engine bay the the vacuum pipe had to be routed through the bulkhead to the original vac advance fitting on the front carb. I ran it through flexi conduit again to keep a uniform appearance and give it some protection.
Seen from the inside.
Out through the bulkhead.
Pushed onto the carb fitting.
Final appearance.
Next week comes the ultimate test when I'll hook up the battery and try and start the engine. I'd hoped to do it today but I just ran out of time.
Regards,Dave.