[wm07]

Hi all, I am trying to tune a STU map, and I tried to lean out the map and it does not go any leaner at some spots. Some go as rich as 10.1!

I have already done the Intake Calibration, but for some reason, the AFR just wouldn't change much no matter how I modify my Primary Fuel table. Anyone has any idea? Please help!

Oh, my car is an 04, with stock intake box, other performance mods include perrin turbo inlet, ceramic coated header, downpipe w/ a high flow cat, catback.

Here is my Primary Fuel table. You can see I even put 1.0 at some area and it still are running 11.x.


Here is a log.
A/F Trim Immed. A/F Trim Learned Engine Load Engine RPM Ignition Timing Knock Activity Throttle Position LM1-A/F Ratio
5.1 0.39 0.32 1869 32 11 14.58
5.1 0.39 0.32 1869 32 11 14.24
1.96 0.39 0.91 1948 37.5 44 14.02
-3.53 0.39 1.12 1842 27.5 95 13.54
0.39 0.39 1.14 1974 29.5 100 12.64
0.39 0.39 1.14 1974 29.5 100 13.24
0.39 0.39 1.17 2041 29.5 100 11.79
0.39 0.39 1.19 2050 28.5 100 12.48
0.39 0.39 1.21 2091 28 100 13.05
0.39 0.39 1.21 2091 28 100 13.39
0.39 0.39 1.23 2150 28 100 13.66
0.39 0.39 1.26 2219 28 100 13.67
0.39 0.39 1.3 2249 27 100 13.73
0.39 0.39 1.3 2249 27 100 13.69
0.39 0.39 1.33 2303 27.5 100 13.85
0.39 0.39 1.36 2382 28.5 100 13.82
0.39 0.39 1.41 2435 28 100 13.77
0.39 0.39 1.41 2435 28 100 13.86
0.39 0.39 1.46 2487 27 100 13.69
0.39 0.39 1.52 2549 26.5 100 13.26
0.39 0.39 1.58 2626 26 100 13.16
0.39 0.39 1.64 2715 25.5 100 12.98
0.39 0.39 1.64 2715 25.5 100 12.67
0.39 0.39 1.71 2793 25 100 12.44
0.39 0.39 1.8 2840 24.5 100 12.32
0.39 0.39 1.88 2964 23.5 100 12.27
0.39 0.39 1.88 2964 23.5 100 12.2
0.39 0.39 1.95 3012 21.5 100 12.02
0.39 0.39 1.98 3130 22 100 11.76
0.39 0.39 1.98 3223 22.5 100 11.66
0.39 0.39 1.98 3223 22.5 100 11.54
0.39 0.39 2.01 3279 22.5 100 11.51
0.39 0.39 2 3389 23 100 11.48
0.39 0.39 2.01 3471 23 100 11.42
0.39 0.39 2.01 3471 23 100 11.38
0.39 0.39 2.05 3559 23 100 11.38
0.39 0.39 2.07 3666 24.5 100 11.42
0.39 0.39 2.08 3766 24.5 100 11.2
0.39 0.39 2.08 3766 24.5 100 11.16
0.39 0.39 2.12 3833 24.5 100 11.05
0.39 0.39 2.12 3927 24.5 100 10.98
0.39 0.39 2.13 3996 25 100 10.86
0.39 0.39 2.13 3996 25 100 10.82
0.39 0.39 2.13 3996 25 100 10.78
0.39 0.39 2.13 3996 25 100 10.76
0.39 0.39 2.13 3996 25 100 10.73
0.39 0.39 2.13 3996 25 100 10.72
0.39 0.39 2.16 4347 25.5 100 10.64
0.39 0.39 2.2 4458 26 100 10.58
0.39 0.39 2.21 4594 26.5 100 10.67
0.39 0.39 2.21 4594 26.5 100 10.51
0.39 0.39 2.25 4658 26.5 100 10.41
0.39 0.39 2.26 4706 27 100 10.39
0.39 0.39 2.3 4785 26.5 100 10.33
0.39 0.39 2.3 4785 26.5 100 10.3
0.39 0.39 2.3 4906 27 100 10.23
0.39 0.39 2.33 4970 27.5 100 10.2
0.39 0.39 2.32 5063 28.5 100 10.17
0.39 0.39 2.34 5114 28 100 10.14
0.39 0.39 2.34 5114 28 100 10.11
0.39 0.39 2.34 5242 28.5 100 10.11
0.39 0.39 2.37 5303 28 100 10.14
0.39 0.39 2.37 5385 27.5 100 10.14
0.39 0.39 2.37 5385 27.5 100 10.13
0.39 0.39 2.37 5467 27.5 100 10.08
0.39 0.39 2.37 5542 27 100 10.05
0.39 0.39 2.35 5627 27.5 100 10.05
0.39 0.39 2.35 5627 27.5 100 10.11
0.39 0.39 2.35 5756 28 100 10.13
0.39 0.39 2.35 5781 27 100 10.1
0.39 0.39 2.34 5854 27.5 100 10.13
0.39 0.39 2.34 5854 27.5 100 10.1
0.39 0.39 2.33 5940 27.5 100 10.13
0.39 0.39 2.33 6013 28.5 100 10.08
0.39 0.39 2.32 6122 28.5 100 10.13
0.39 0.39 2.32 6122 28.5 100 10.13
0.39 0.39 2.3 6208 29.5 100 10.14
0.39 0.39 2.28 6272 30.5 100 10.13
0.39 0.39 2.29 6363 30.5 100 10.19
0.39 0.39 2.29 6363 30.5 100 10.16
0.39 0.39 2.26 6378 31.5 100 10.14
0.39 0.39 2.24 6498 32 100 10.16
0.39 0.39 2.22 6557 32.5 100 10.25
0.39 0.39 2.21 6584 33 100 10.23
0.39 0.39 2.21 6584 33 100 10.2
0.39 0.39 2.19 6718 33.5 100 10.25
0.39 0.39 2.16 6724 34 100 10.19
0.39 0.39 2.15 6790 34.5 100 10.26
0.39 0.39 2.15 6790 34.5 100 10.19
0.39 0.39 2.13 6849 34.5 100 10.2
0.39 0.39 2.1 6908 35 100 10.23
0.39 0.39 2.07 7036 35 100 10.2
0.39 0.39 2.07 7036 35 100 10.25
0.39 0.39 0.5 6865 23.5 11 10.23
0.39 0.39 0.09 6561 23.5 10 12.49
0.39 0.39 0.15 6245 23.5 10 14.41
0.39 0.39 0.15 6245 23.5 10 15.71
0.39 0.39 0.16 5949 23.5 10 14.35

[TheMadScientist]

That fuel map is whacked. Why don't you have AFRs in that map? Leaner=higher #'s when it comes to AFR.
Reload a real fuel map and restart your tune.

TMS

[jays05]

When you say that you did the intake calibration, what did you do to it? With a stock airbox you should be running the stock maf calibration.

[WolfPlayer]

First, you need to go to the options in StreetTUNER and change the display options to not use Lambda for fuel but to use the AFR. Simple as that.

Second, even after you do what I said above, IMHO, your fuel curve is whacked. There is no freaking way that you want 14.7 AFR (1.0 lambda) at 3200rpms and 3.10 load. Something is whacked on your setup. Even in a worse case scenario where StreetTUNER's AFR is 1.5 points off as compared to reality ... that would be 13.2 AFR and, IMHO, that is not enough fuel for 3.10 load and 3200rpms.

Another reason I think that something is whacked is because you are only pulling a max of 2.4 load. WTF? Stock STIs will hit 3.0 load easily. Heck, I've hit 3.4 load on a few occasions when it was cold out. 2.4 load will correspond to fairly low MAF volts (unless you are running a bigger MAF tube????). It looks like your car is running very very low boost.

t

[wm07]

hmm... Thanks! a lot of interesting points. I did change the display options last night, and have yet to do any logging yet.

The reason for whacky fuel curve is because I did try to pull a little fuel here and there to try to see if the APR would change, nothing happened, and I ended up pulling a lot of fuel at some area just to prove a point.

I think my stock boost gauge shows around 1 par of boost, which I think is normal. I will try to log my boost later today to see. I have stock air box, so the size of the MAF tube should not be a problem, right? I am starting to think the MAF might be bad? however, when I run the stage 2 map and did some logging, everything looks good? I will see what I can find out today.

[jays05]

Log maf voltage too. If it is abnormally low, it's really easy to clean the MAF (try searching here for it).

[Christian.]

Originally Posted by wm07

I think my stock boost gauge shows around 1 par of boost, which I think is normal. I will try to log my boost later today to see. I have stock air box, so the size of the MAF tube should not be a problem, right? I am starting to think the MAF might be bad? however, when I run the stage 2 map and did some logging, everything looks good? I will see what I can find out today.

You will need to log your DAM to see if you are in the High Detonation Fuel Map...which would explain your fuel curve. Otherwise I would need to know what octane you are tuning with to make any further suggestions?

Take care,
Christian.

[wm07]

ok, today I switched to a base map and did some logging, then I trimmed the fuel a little and it looks like it did change a little(about 0.2 leaner). The max engine load is still around 2.85, is it normal for stock boost? or my MAF sensor need a cleaning? my car is an 04 and 16,xxx miles. Oh yea, I have a drop in filter too, which is not an oil type.

I will do some more logging tomorrow and will log the MAF voltage and DAM. So there is another map the ECU will look at under certain condition? I guess my ECU was doing that then. Oh, I am running California 91...

Thanks for all the help!

[jays05]

Max load of 2.85 sounds around normal for stock boost levels.