camshea wrote:
Hi all,
I have a 2013 STI that I am trying to tune with MerpMod, and would really appreciate some help.
I grabbed a copy of a flex fuel capable version from here -
viewtopic.php?f=37&t=14020, but I don't think the definitions are working properly/or at least not in the way that I would expect them to work for flex fuel. It looks like an older version, but I've tried building MerpMod myself and I'm close, but still getting errors in compiling etc.
Q1 - There is a map blending for injector, throttle, cranking, startup. As far as I can tell, I use a multiplier in these maps to add more fuel (after setting up the input via the sensor). So if I understand - as an example, if I have a 1012cc base injector, and I want to make the ECU add 38.6% more fuel by volume then I put 0.755 in this map, making the ECU calculate its injector times like it is 764cc and therefore add more fuel. Is that a correct understanding?
Q2 - There appears to be no map blending for boost or timing? Normally I would add more boost and more timing on the E85 side. Or is that only possible via the SI drive maps?
I've attached the ROM I am using, with the definitions, and a screenshot of what I can see in the Eculash menu.
It's been a while since I played with this and set it up, but I believe you're on the money.
Yes thats how it works for injectors, its the inverse relationship. So 30% isnt 1.3, its 0.7 as youve surmised.
Those map blending multipliers are specific because they change values from the default map (ie, stock tables).
The fuel/boost/timing blending happens between the two maps in that "mode".
Ie, Intelligent has 2x tables. First one is 0 and second one os 1, and depending on your configured input/blending ratios is where they blend.
That's where your default map switch, default blending ratios, map blending input mode and the selected input mode scaling come into play.
So if your ethanol sensor says your at e50, and puts out 2.5v to your TGV left input, if that's scalled so 2.5v = map blending ratio of 0.5 then it blends halfway between maps 0 and map 1.
