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Advance curve maps

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kommando

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Post 26 Nov 2016, 12:43

Advance curve maps

Question on the WorkAngle Map, there are 16 sets which are for the changing air flows, is 1 the lowest or the highest air flow. The example curve has the greatest advance at air flow 1 and lowest at flow 16, note that I am setting the curve for a carb slide which is directly linked to the throttle and not a CV carb so at low revs if you open the throttle to WOT the air speed will drop, the mixture weakens and you risk pinking.

Also I can only seem to be able to edit one named table called tunable set, how do I get to edit all the named tables, if I go into 4 Functions and select different named tables for gasoline and gas when I then select edit tables it still only gives me the same table regardless and the Table set name reverts to the first one I renamed from tunable set. Got that sorted mostly, by going to Firmware data and reading Flash from Secu-3 I could then edit the tables for the 4 named tables and the names for the tables.
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STC

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Post 26 Nov 2016, 19:45

Re: Advance curve maps

Hi,
N1 is small "air flow". Used if engine conditions near to idle. Corresponds to small pressure in the intake manifold.
N16 is big "air flow". Used if you sharply open throttle. Corresponds to the maximum pressure in the intake manifold.
There are two parameters on the "4: Functions" tab. Upper and lower pressure. These two parametets map pressure range onto 1...16 "air flows".

Next. There are five sets of curves. First four can only be edited from "Firmware data" tab: read firmware, edit, write back. Also you can edit names here (click on set name in the list and it becomes editable).
Last (5-th) set can be edited in real time, it stored in the EEPROM.
Author of the SECU-3™ project http://SECU-3.org. An open source engine control unit / Ignition control system, (C) 2007.
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kommando

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Post 26 Nov 2016, 20:34

Re: Advance curve maps

That is fine, I know what to edit the tables too now, looks like I will need to play around with the low air flow settings, reading up it is normal to advance timing at low pressures but I will test the engine running at low revs and large throttle openings and see what the pressure reading is when its pinking and retard the timing accordingly and retest until I get rid of the pinking. I will start with the N16 being the current std timing curve and add advance as the number decreases and take it from there.
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STC

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Post 26 Nov 2016, 22:45

Re: Advance curve maps

Yes, so, another words, pressure range is distributed between 16 curves in work ignition timing map. This is some kind of assigning axis values, and nothing else.
Author of the SECU-3™ project http://SECU-3.org. An open source engine control unit / Ignition control system, (C) 2007.
Клуб проекта в Facebook https://www.facebook.com/groups/secu3club
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