if i were to trick the stock ecu that the afm is open 75% all the time with 80degrees air all the time... how would i wire it like that for a s5?

 

Why the hell would you do something that stupid?

 

Not to flame as bad as NZ, but really, why would you want to do that?

 

because i have a megasquirt controlling fuel and stock ecu controling ignition and emop

 

cant you just upgrade to megasquirt N spark software and not worry about stock equip?

 

the software itself wont do it, need the physical unit itself to support it... and that is... more money :/

 

Whadda-ya mean slpin, you know better than that? The Megasquirt N Spark Extra software and hardware will fully support both leading and trailing ignition for all 2nd gens.

If you have the MS-I v3.0 board it is at most another $10 to run full 2nd gen ignition--knowing what timing to run is another story. If you have the v2.2 board add another $5 since you'll need another CAS Vr circuit.

And yes that also means you won't need the AFM anymore. Faking out the ECU to attempt to get good ignition timing will lead to poor running. Either leave the AFM in and use the stock ECU for timing or go over to full Megasquirt control.

I have my car running with MegaSquirt fuel right now with the stock ECU controlling spark and emissions. Almost done tuning the fuel map. Soon I'll start running ignition and emissions. I did have to build two extra output circuits for the emission control solenoids--again, we're talking a few dollars here. I didn't even spend the $20 on a nice Error* daughter board, I used a $4 IC prototype board--fits perfect in the stock ECU case. For EGT circuit, electronic boost control circuit, 2 solenoid circuits, and one CAS vr circuit it cost about $40 including the board--uhh batterys not included.

Here's what it looks like:


Oh yea, the one in the picture is in the fuel piggyback mode. Once I go full MS, the stock ECU connectors will go in and the pigtails connections you see will be gone!
Scott

 

what i meant was, my megasquirt cant do it with just software because it is the fuel only one with no daughter

btw, how does your idle map look like...
mine is pretty driveable and drives nicely, but it just doesnt idle too good....