328 Ignition curves for different market - Ferrari Life
 
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post #1 of 4 Old 09-30-2013, 12:57 PM Thread Starter
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Ignition curves for different market

It appears that Ferrari used the same Microplex ignition box for all markets. It also appears that there were two distinctively different ignition curves; one for the US market, the other for Europe that was switchable with a jumper. However, looking at the Swiss market only car, the ignition curve appears to be different from both the US and Euro curves. Do anyone know how they did that (initiated the different curve) or perhaps have a Swiss-market wiring diagram, presuming that it's different from a normal Euro-market car?

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post #2 of 4 Old 09-30-2013, 01:13 PM
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There are may different curves built into the microplex boxes. There are 3 different programs utilizing the various curves under different conditions built into it to cover all market requirements.

The Base, US and Switzerland (the most conservative).

There is a ground wire attached to either pin 17 for the US, 23 for Switzerland or neither for Base.

It is all in the various Microplex diagnosis materials but they really don't point to it.

There is not a big difference to any of the settings and in fact all of them are very conservative. My 328 is running nearly 11:1 compression with the base curve on California rat urine gasoline and there is no problem with detonation.


I tested it years ago with a Jofatron and there was a max difference of about 4 degrees in some low to mid RPM areas.
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post #3 of 4 Old 09-30-2013, 01:21 PM Thread Starter
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Thanks Brian. I meant to say programs versus curves, but I understand what you're saying. I hadn't realized that there was a third option for the ground wire. That's the piece of the puzzle I was looking for. Excellent!

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post #4 of 4 Old 09-30-2013, 02:28 PM
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Quote:
Originally Posted by Brian View Post
There is a ground wire attached to either pin 17 for the US, 23 for Switzerland or neither for Base.
I see the pin out in one of the Ferrari technical documents also mentions pin 18 as an additional curve family ID pin along with 17 & 23. Perhaps unused or different application?
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