Am I running rich? Pic

[redss]

My latest project is a KA-T and I have been working on it every weekend. I installed a Walbro 255, 370cc SR injectors, and a weapon R FPR (not great but it works). I have not install the turbo just yet since I am still looking for the right fittings for the oil feed and return.

At this point, I am use a SAFC2 to tune the fuel back to stock level and I was told to put it somewhere near 27% all the way across the board. Here is a not so great pic of what the plug looks like after a day.



Question: Am I still running rich?

Also, does anyone have any good suggestion on SAFC2 tuning for the KA-T? Where does everyone set their lo and hi throttle % opening? How does your lo and high fuel map look like?

[skatanic28]

you know you are supposed to set it to -27 right? +27 would make you real rich.

i just threw the 370's in today and took it for a spin with -25% on the safc and it was around 13.8-14.2 at idle. when driving lightly it was 14.5-15.0 like stock. i pulled a bit more fuel out at idle and it seems to be good now. i need to datalog a few WOT runs with the wideband before i make any more changes though.

[nissanfanatic]

Kind of a blurry pic, but thats what my plugs look like with a 8:1 FMU. A wideband is your best bet for a yes or no type answer.

[Structure240sx]

looks more like your running kinda hot or jsut right. do you have the fuel pressure set right? a wideband is a great investment. especially if you have many turbo projects like it seems you do

[redss]

skatanic28: I set the lo throttle and hi throttle map identical and have -14 from 1000 to 3600 and -27% from 3600 to 7200. Like I said before, the car feels all right and drive pretty close to stock but slightly sluggish on low end. I tried going -27% all the way across but the car can't idle sometimes after I shut the throttle from WOT. It seems to behave a little better slightly richer on low RPM. How do you set your lo and hi throttle position and how does your lo and hi throttle map look?

I am buying a WideBand to tune this beast and I will put it in with the custom turbo kit. The fuel pressure looks pretty much stock. It measures 35 psi on vacuum and 40 no vacuum.

[skatanic28]

alrite i got a couple runs in last nite, and even with -27 im still in the 11's at a few points. my idle when cold is around 13.0-13.5, but when it warms up its right around 14.7. i set my TH-points to 35 and 70. well even with it -27 all the way across, i was never above 13 at heavy throttle. i made a few changes and its a little more consistent now. why do you have it at -14 from 1000-3600?

[redss]

alrite i got a couple runs in last nite, and even with -27 im still in the 11's at a few points. my idle when cold is around 13.0-13.5, but when it warms up its right around 14.7. i set my TH-points to 35 and 70. well even with it -27 all the way across, i was never above 13 at heavy throttle. i made a few changes and its a little more consistent now. why do you have it at -14 from 1000-3600?

Hmmm...

35 and 70, eh? How does your lo and hi map looks like? I set my lo and hi map to identical setting so I guess it won't matter where my throttle is at? My map is still at -14 from 1000 to 3600 and -27 from 3600 to 7200. I still don't understand the concept of having lo and hi throttle maps. Why 2 maps and how are they suppose to differ from each other?

I had it on -14 from 1000 to 3600 because the car likes to die sometimes after WOT and shut off. I don't know why but the car seems to idle better running a little rich down low.

I am getting a wideband and a MSD 6BTM for the timing. I will put them in while I am installing my turbo kit. I guess you have a WideBand on yours? What's your set up like?

[skatanic28]

just got my mani and dp on monday, so im still installing it all. but ive had the safc and zt-2 installed for a few months now. tossed in the 370s on monday and just tuned it to run like stock. i still have to put my btm in as well. my hi and lo maps look similar, but i changed the hi in a few places according to the zt-2 logs. i wouldnt make too many drastic changes without a wideband.

basic question here though, at low throttle you are in closed loop with the o2 anyways right? so the ecu would be modifying whatever you input anyways i would imagine.

[redss]

just got my mani and dp on monday, so im still installing it all. but ive had the safc and zt-2 installed for a few months now. tossed in the 370s on monday and just tuned it to run like stock. i still have to put my btm in as well. my hi and lo maps look similar, but i changed the hi in a few places according to the zt-2 logs. i wouldnt make too many drastic changes without a wideband.

basic question here though, at low throttle you are in closed loop with the o2 anyways right? so the ecu would be modifying whatever you input anyways i would imagine.

How close did you put the O2 sensor of your wideband? Did you weld the bung at the beginning of your turbo dump pipe or downpipe next to the factory O2?

I thought factory ECU is open loop on lo throttle and closeloop on WOT? It will ignore the MAF during WOT and run the injectors full blast? Maybe someone can school me on how the stock ECU work if I am wrong about this.

[skatanic28]

I thought factory ECU is open loop on lo throttle and closeloop on WOT? It will ignore the MAF during WOT and run the injectors full blast? Maybe someone can school me on how the stock ECU work if I am wrong about this.

to my understanding, at WOT the mafs input is not ignored, the o2 feedback loop is however. with the o2 feedback being taken at low throttle, that makes it a closed loop system, trying to get to stoich.

[redss]

to my understanding, at WOT the mafs input is not ignored, the o2 feedback loop is however. with the o2 feedback being taken at low throttle, that makes it a closed loop system, trying to get to stoich.

So, the MAF reading is used all throughout the RPM range? There is no preset map in the ECU for WOT?

[SloS13]

I wouldnt think so. Amount of fuel needed on a hot night would be completely different than on a cold night.

Skatanic28 did a good job of explaining why you're seeing 14.7 at idle.

I find it's good to tune with the factory o2 unplugged, that way you dont have to worry about when the ECU is in closed or open loop

[skatanic28]

while we're on the subject, ive noticed some weird startups with the 370's now. when its cold (under 30*), it will bog down to like 200-300 and try to stall out. is this just the ecu overriding the safc2 correction and running the cold start mode? once warm it idles in the high 14's so i cant think of what else it could be.

[SloS13]

skatanic - are you running dec-air on the SAFC2? that can cause problems with cold starts IIRC

[skatanic28]

nope i have that off

[redss]

I have notice irratic idle after I start tweaking with the SAFC2. It will want to die and not idle if I tune the fuel out too much at lo throttle. It has since gone away after I driven it for two weeks straight. I think the long term fuel trim finally caught up.