I should also note that your car jumps really high in rpm on startup,
Idle settings
Cranking pwm
-lower the pwm% when it's full warm
You are looking for the car to go 100-200 rpm above target on startup then level off
Yes but if we constantly change both variables (ve and blend%) we may chase our tails.I'll try that. But if I don't change the VE table, won't it run more rich going from 50% to 20%?
Yes but if we constantly change both variables (ve and blend%) we may chase our tails.
Datalog will allow us to easily see the afr error % for both the 50% and 20% blend we are looking to get the error% delta down for all idle temps.
yes, i did it with my old build with great results.I think I figured out why the stock ecu doesn't seem to have this problem. The stock strategy uses the MAF sensor for air density to calculate fuel. And just uses the MAT to pull timing when it's high. So, MAF is another option to "fix" the heat issue. Not sure I want to do that right now though, just learning to tune SD.
Now if we can't get this to work well, I'll try moving the MAT to the inlet elbow. I can see that still being heat soaked at first start up being right above the header, but has other people done this without having to have any MAT/CLT correction?
yes, i did it with my old build with great results.
Newer maf sensors also have the MAT sensor built into them. I am currently running MAF strategy with the MAT sensor in the intake below my blower, this was necessary as the blower is PD and mounted directly to the manifold. besides the first start i have not tuned on it yet so i dont know how it will do with heat soak.
only other option you have is to enable EGO correction so it works at idle, it may work well for you since you have a stock cam.
in ego settings change...
-active above rpm = 800
-ego delay = 4
1: maybe, you would have to try both ways.. The only issue with using ego correction at idle is that it will sometimes cause a AFR swing, the sensor delay at idle is very high with a WBo2. what it reads may be up to a half second late.. the ecu does not know this and just corrects by what it see's. try it and report back, you can always change it back.Hmmm.... I'm sure as with anything there is pros & cons. What cons would there be with using EGO correction for idle. And if I do try it, go ahead and zero out the MAT/CLT correction table again?
And was the "yes" in the first part of your reply in reference to moving the MAT sensor?
1: maybe, you would have to try both ways.. The only issue with using ego correction at idle is that it will sometimes cause a AFR swing, the sensor delay at idle is very high with a WBo2. what it reads may be up to a half second late.. the ecu does not know this and just corrects by what it see's. try it and report back, you can always change it back.
2: that was a yes in reference to the mat sensor. I was attempting to find a way for you to avoid having to modify your charge tube and wiring to move the sensor.
as far as skewing i will say yes. this table for all intents and purposes is meant for those who get the MAT reading in the intercooler of a turbo car or from the air box and not the intake manifold. it allows them to add a small percentage of the CLT to the mat to correct the reading as the air in the manifold will be hotter than the airbox, but not as much as the ford placement shows...I'll try the EGO correction at idle and see what happens. Sounds easy enough to try.
I don't mind moving the sensor if it will work. Just thought I'd try seeing if I could tune around it. I guess technically, the MAT/CLT correction is just lying to the ecu, and would never be exact as it's just skewing the #s to be "good enough".
That is part of the learning process!
3-4% is way better than the 10% you were seeing. I would say as long as the car idles correctly dont chase your tail to much. If you didn't have the wideband would you even notice? Probably not.
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