Word from the manufacturer is that the module can switch down to 1.5 Ohms, with the standard coil value of 3.0 Ohms working just fine. The word is to be careful. If the module goes short on a few turns of windings through age or damage, it won't take much to damage the output mosfet in the the module. I think with the access to the board however, that this is one unit I could personally fix.
Bosch SU12R coils measure up at 1.7 Ohms, so leave a small margin. I've fitted one in and it works fine.
Two items I've found with the Blackbox.
First, when using realtime, the value of advance given in the box is half the actual value. (The value below should be ten for instance)
Secondly, when inserting your own curve, the value of dwell and timing (at the half value in the information box) must add up to be less than 90 Why? I don't know... but for the given default value of 75.5% dwell plus half the requested timing (30 deg), that equals 90.5 and will be rejected by the module. So one must either drop the dwell or the timing to comply.... I dropped dwell to 74 degrees to make the standard required...
I am sure this must be to do with the breakdown of the timing period adding up to 90 degrees of a 360 degree rotation of the distributor.
I've set the curve now to something more useable, and I took it on a long drive this afternoon up in the hills. In particular there is a very looooong hill just near my place which a lot of Canberrans will know of on the way out to Bungendore. I like to go through the gears up to fourth and test the torque as I accelerate from about 60 and up. The curve I am now using is more appropriate for my car and cam, and I definitely noted that the part and open throttle acceleration is definitely stronger. Not the fault of the blackbox, but the curve I was previously using. The blackbox allowed me to make a better choice is all.
