AFC-SplitSecond PSC1 Map Library

[SpeedAdiction20]

the overpressure setting is just when it tells the car to go into closed loop??(I said open loop before, but I guess that is not what it is, it doesn't really matter) but the point is that it forces the car to start using the map it has for in boost fuel control, and therefore when the ssafc starts being useful, to put it simply, after having it set to -1 for a while, I liked it set to what I have it at now, which is .2, that means that the ssafc will start adjusting fuel pretty much right when you get into boost and hit .2 (and on the fuel maps, the cell for that is .5, not 0psi) but I changed it because when I do highway driving I didn't want the car to switch unless I was actually in boost, and sometimes when I'm going up slight inclines the boost will stay right at 0psi or just under, it just prevents the fuel maps from changing back and forth while driving, just makes it easy IMO,

I would set it to .2 or .5 or something like so that it will switch early and you don't have that hic-up when the ECU changes loops that people talk about, (you will notice it eventually, but it's just easier to take our word for it now and look for it later, makes tuning smoother)

 

[SpeedAdiction20]

Does anyone know what modification the SSAFC is actually doing to the O2 past the trigger? Is it outputting a constant voltage? Is it outputting an offset voltage? Is it outputting a wave with a specified mean?
With the AEM I have all three options. Seems like offset works the best, but was curious what the SSAFC uses.
It would be nice if someone had a plot of the OBDII O2 sensor reading, but even I haven't found decent software that does that yet.

since no one answered your question, it is probably because the ones that actually checked the thread don't know, or they just don't want to answer, but either way I'm not sure, I just know it adjusts the voltage higher or lower so that the ECU increases or decreases the injector pulses.. past that I have no clue, but it works..

 

[MSP2k3]

Here is the problem I have with thinking that the AFC forces the ecu into open loop. When i dropped in my 440cc injectors. I had the superstock map (map for stock injectors) still in the AFC. The ecu controlled the injectors fine for idle, cruising, and even WOT for anything below the 4k rpm threshhold. Once the ECU flipped to open loop at 4k rpm, the wideband would peg 10.0. This tells me that the ECU was still using readings from the o2 sensors (closed loop), even when my overpressure setting was set at 1.1 psi.

This being said, when i loaded a different 440cc map, that had values way 'leaner' than the superstock map, the car would lean WAY out before that 4k rpm threshhold. This tells me that the AFC is making adjustments before 'open loop'.

I just don't know exactly how the two are interacting in closed/open loop. Obviously they communicate a bit differently in the two scenarios.

 

[Silverspeed2015]

to datalog with the v2 do i need to hook the afc to anything other than my wideband? such as tach?

 

[SpeedAdiction20]

nope, just hook up one of the orange wires..

and MSP2k3, it might just be that the stock supermap before 4k is pretty good, I mean 4k is usually the point where the map goes really rich anyways, or really lean depending on the car/mods, but either way that is when the turbo really kicks in, and from what I have heard, that is when there is problems in the stock fuel maps anyways, but I can actually see little "blips" in the datalogging when I change the "over pressure" values, it is really subtle, but you do notice it after a while of studying the logs and stuff like that

 

[justanothermp5]

the AFC should already be hooked up to your tach if you installed it correctly..

 

[Silverspeed2015]

I never though of that, I guess that's how it works, haha

 

[Silverspeed2015]

i connect to the white wire coming from the wideband correct?

 

[Carlinator]

Depends on the wideband, colors might be different. If you got a manual with it, though, it should say in there. Sensor signal wire hooks to the AFC input, Sensor Ground hooks to... a ground, obv.

 

[SpeedAdiction20]

^^ ya what he said, and if I remember correctly, at least with the AEM WB, I think it was the white wire, and the blue wire, if I remember is the one that you don't hook anything up with, but either way, check the manual, it's been a while since I hooked it up if you have the AEM one

oh and also, hook it up with the black stripped wire I think.. pretty sure that is the input A for the ssafc, it doesn't really matter, but I like to have it as the first input.. just personal preference and nerdiness lol

 

[Silverspeed2015]

thanks guys, i am using the AEM UEGO i looked at the manual from AEM but it was confusing they said the blue was for real time datalogging but i think they ment using a serial port not connecting to an afc

 

[SpeedAdiction20]

yup, that's what it was for.. so ya the white one

 

[Silverspeed2015]

you dont need to set the rev limiter with the SS AFC, do you?

 

[jdwk]

Here is the problem I have with thinking that the AFC forces the ecu into open loop. When i dropped in my 440cc injectors. I had the superstock map (map for stock injectors) still in the AFC. The ecu controlled the injectors fine for idle, cruising, and even WOT for anything below the 4k rpm threshhold. Once the ECU flipped to open loop at 4k rpm, the wideband would peg 10.0. This tells me that the ECU was still using readings from the o2 sensors (closed loop), even when my overpressure setting was set at 1.1 psi.

This being said, when i loaded a different 440cc map, that had values way 'leaner' than the superstock map, the car would lean WAY out before that 4k rpm threshhold. This tells me that the AFC is making adjustments before 'open loop'.

I just don't know exactly how the two are interacting in closed/open loop. Obviously they communicate a bit differently in the two scenarios.

Read my explanation of hesitation. http://www.mazdas247.com/forum/showthread.php?123792646-Hesitation-explained-with-pictures.&highlight=explained+hesitation

The SSAFC cannot alter when the car goes into open loop, it can only adjust the O2 sensor signal so that the PCM adds fuel in closed loop.

I really really wish one of you SSAFC owners would grab an OBDII scan tool and watch your closed/open loop status, STFT, LTFT, and your O2 sensor reading. You can pick them up for $90 from Harbor Freight and then return it when you are done. It just would be very educational to know what modification the SSAFC is doing, and in 145 pages of posts it doesn't look like anyone did this.

Split Second's piggyback tuning pdf says that you explicitly need a scan tool to tune with their products. There is a whole section on the scan tool on page 7 that talks about closed loop tuning.http://www.splitsec.com/technotes/Piggyback_Tuning.pdf

 

[HKPRO5]

Interesting. I have a live data reader scan tool. Ill see what I can do. Im off tomorrow........wait. my o2 sensor on the wide band isnt hooked up. sensor is stripped...=(


Can you PM me on exactly what i need to do?

Thanks!

 

[MSP2k3]

The SSAFC cannot alter when the car goes into open loop, it can only adjust the O2 sensor signal so that the PCM adds fuel in closed loop.

I'm pretty sure it is closed loop that you cannot alter, (i.e. when the ecu is using the o2 sensors to adjust AFR), Open loop on the other hand, the ecu is reading pre-selected AFR charts (above 4k rpm and WOT), and this is where the AFC can make solid adjustments.

 

[SpeedAdiction20]

ya jdwk, I had wagon link the post I had to the U-Tune article on the first page, but it explains all that stuff and closed and open loop, I've read it a few times over a little while back, it's a good article, and it doesn't really say that you need to use the scan tools with the ssafc, it just says that it is a good tool to use with tuning, and explains the uses of it if you choose to use one.. but ya I'll eventually get one, I just don't have the money or time to do that right now, and the tune I have for my car, and how I tune my car seems to work great for me right now

 

[Silverspeed2015]

I've been trying to figure out how to datalog but I have no idea. So how do I use the r4 software to tell me what afr's I'm running at what boost and rpms?

 

[Carlinator]

You have to convert the raw voltage input to the AFC into an AFR reading. Under Options->Aux Input Settings, there's a button labeled "Calculator". You enter min voltage, max voltage and the readings at those two, and it automatically calculates the conversion from there. To datalog just hit the record button on the main screen, then do your driving. Once you stop, you can go into View->Recordings, and it'll have all the ones you've done saved for you to choose from.

 

[SpeedAdiction20]

ya, for the AEM wb, the values for the aux input settings, is 10 and 2, which you will get if you do what Carlinator said