123Tune advance curves - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 9 (permalink) Old 12-26-2016, 10:14 AM Thread Starter
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123Tune advance curves

I just ordered a 123Tune for my 1750 S2 engine. I decided to buy the fully programmable unit because I like being able to fine adjust the curve for my car, and I don't like the idea of having 16 curves where maybe two suit my car, making 14 of them useless for my application.

How about we gather the curves that we use here, for both data and discussion. Does anyone have any of the 16 curves for programming yourself?

I guess a warning is in order, in that you risk ruining your engine if you mess the curve up (detonation)
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post #2 of 9 (permalink) Old 12-26-2016, 12:26 PM
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Tom Sahines did a bunch of work developing a good starting point curve. In his opinion none of the old Alfa curves were very good. Details here:

Petronix distributor

Works very well for me.

Tom

1991 Spider
1963 Giulia Spider (1750 engine)
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post #3 of 9 (permalink) Old 12-26-2016, 01:06 PM
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The other curves may be handy for use on different race track set-ups and as rules for your race class change.....

'64 Guilia Spider
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post #4 of 9 (permalink) Old 12-26-2016, 01:37 PM
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I have no experience with 1750 motors. For 2L motors "D" curve is excellent for high output engines and "1" works very well with stock or mildly tuned engines.

Ed Prytherch
79 Spider
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post #5 of 9 (permalink) Old 12-26-2016, 02:12 PM
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Here is the curve I am using. I have not had a chance to fiddle with the vacuum. It is hooked up to the Spica block. If anyone has any further suggestions, shoot. I haven't fiddled any more since I installed it and set it to this curve. It is pretty good so far, but would like to play around a little more someday. Maybe steeper? My engine has performance stuff; valves and cams, but not race by any means.
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post #6 of 9 (permalink) Old 12-27-2016, 05:24 AM Thread Starter
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Quote:
Originally Posted by Alfajay View Post
I missed their tech session at the convention, but I did save a write-up on the 123 distributor that Tom posted recently on the Yahoo Groups 750/101 list. Here's his section about the shape of the curve:

A good starting point would be

RPM LIMIT 6500 (or less if you are concerned about over revving your motor)

point 1 500 rpm 6 degrees

point 2 1000 - 6

point 3 2000 - 20

point 4 4500 - 38

point 5 8000 - 38 (dont worry this can never happen as the rev limiter
will be your actual maximum)
Found this in another thread: 123ignition tune installed

More Alfa curves from papajam: Advance curve
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post #7 of 9 (permalink) Old 12-27-2016, 08:34 AM Thread Starter
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What would be the properties of an economy/roadtrip curve?
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post #8 of 9 (permalink) Old 12-28-2016, 01:12 PM Thread Starter
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Quote:
Originally Posted by iachella View Post
Here is the curve I am using. I have not had a chance to fiddle with the vacuum. It is hooked up to the Spica block. If anyone has any further suggestions, shoot. I haven't fiddled any more since I installed it and set it to this curve. It is pretty good so far, but would like to play around a little more someday. Maybe steeper? My engine has performance stuff; valves and cams, but not race by any means.
This you use the Tom Sahines curve as a starting point?
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post #9 of 9 (permalink) Old 12-29-2016, 11:14 AM
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Yes, I started with Tom's suggestions. If I remember correctly, I tried to make it a little steeper and it didn't degrade, but don't know if it any better.

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