Ideally the 123 would be able to drive a Bosch 0 221 119 334 coil with a maximum of 6 or 8 Ampere coil current. From what i remember the 123 circuit board uses a standard ST Powermesh IGBT transistor which can easily handle >20A coil current at engine room temperature, so technically it should not be a problem to use such a setup.Stefan2000 wrote:Adrian, that makes sense. The guy producing the 123 ignitions lives around the block for me so i'll might discuss with him what is possible and what not. If i understand you correctly the downside of this ignition is the maximum current output from the coil in combination with what the circuit board of the 123 could handle. So a higher output coil might raise your output but could damage the circuit board?
Temperature problem might be less of a problem in a fiat dino compared to a Ferrari dino because it right there with it's nose in the wind??? (well ofcourse it's behind the radiator) I can monitor the temperature from the 123 on my laptop and so far it never exceeded 60 degrees or something while driving.
Your right about the coil current, i can also monitor it on my laptop and it is somewhere inbetween 3 and 4 Amp's
I do drive the BPR7EIX Plugs.
Do i need a special zener diode, i see that for a 12V you can have 0W to 5W
http://www.dil.nl/Search.aspx?SearchFor ... Abort=True
Thanks for the interesting reply!
You can use a standard 1-2 W zener diode. BTW, you could also reinstall your Dinoplex and connect it to the 123 (black wire of the 123 to [D] wire of the Dinoplex, tacho wire also to the [D] wire). That way the 123 would handle the ignition advance, and the Dinoplex manages the spark. The tacho should work without modification/zener diode in this setup.
You only need vacuum advance for family cars The main advantage is fuel economy and a bit of engine drivability at low RPMs with a high load and lean mixtures, but for a sports car with carbs where the air/fuel mix is usually set up a bit on the rich side there is no real gain to use vacuum advance IMHO.
Good luck,
Adrian