Quote:
Originally Posted by Speedy1975
The MAP sensor readings look like belt slip to my eyes. I would expect some very slight fluctuations, but not the saw graph we see here. If you check around your blower pulley is there any fine black powder? Do you get any on your fingers if you check? That could be a sign of belt slip as well. I wouldn't expect any at 7psi.
In 90° air 1° of STKR isn't bad. I assume your running 93 octane fuel? Ideally you'd like to see this no more than .5° but again, not a major concern. Your topping out around 14-15° of timing which ain't bad on a stock motor at 11:1 compression. Should feel pretty good.
I'm surprised by the IAT. 182° seems a bit high to me, but your starting point also seems higher than I would expect at 148ish. Was this after romping around in the car or was this cruising to your designated test track easy then romping it? This could be one area for improvement.
The Lambda graph looks spot on after I did the conversion. I'd recommend switching that metric to "AFR" if possible to give readings most people are more used to seeing, like 11.8:1 instead of .80 for example.
Since your MAP sensor appears to be reading absolute pressure, there's no need to log Baro. Looks like it already did the math for you, which is a good thing.
Cross check that belt for any slip, not used to seeing that, and let me know on the IAT questions. Other than that looks real good to me.
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Thanks for your reviews Speedy and yonson. I'm glad to see someone else come to basically the same conclusions that I have; MAP fluctuations and heat.
The belt is doing fine, no slippage.
I sent the top screen shot of the MAP sensor to Edelbrock and they have already responded! They also think that the MAP readings are fluctuating too much. I just finished an actuator test with a hand vacuum pump and sent them the results. We'll see what they say.
Octane setup is for 91, no 93 around here and only one place for 92.
This run was the third run for the day. (Took me two runs to figure the software out.) So I suspect the SC was heat soaked somewhat. My thinking is I need to go after the heat soaking/removal as a project to improve overall performance (and probably improve knock retard). I'll throw up another thread to gather ideas later or if you have some, I'd like to hear them.
I've been fiddling with Euro builds, so I speak the lambda lingo pretty well.
Gotta say these things are a lot simpler that the Audi's where you have literally controllers controlling other controllers in series.
Regardless of this discussion, the E-Force
is running great. I just like to dig in to these systems and learn new things. It still hits 450 ft.-lbs. at 2500 rpm and 560 rwhp as it sets.