Clarification on Coyote MAF tuning

[wbt]

Adding more info for those looking to dial in their MAF.....

....logging with SCT perform the following:

1. Convert MAF frequency (kHz) to period http://www.calctool.org/CALC/other/converters/freq (convert the frequency to period and look at MAF Airflow vs. Period under Airflow > General > MAF Calibration)
2. Looking at STFT....focus on trims that are > than 2% for a given frequency.
3. If you are seeing trims in the negative then the airflow per period cell is too high. Determine the % off and multiply the current value for the cell by the % off. Subtract the % off from the current cell value. I.E. 40.23*.05-40.23=38.21 Do this for every point that is >2% off (average bank1 and bank2 to determine the % off).
4. If you are seeing trims in the positive then the airflow per period cell is too low. See above to correct except ADD the % different off from the current cell value. I.E. 40.23*.05+40.23=42.24
5. Once corrected perform the same logging as before. Review the log and make adjustments as needed until you see STFT no greater than 2%.

To dial in I logged steady state RPM for low airflow values and then performed several WOT runs in 3rd from 2,500 to 7,000. It will take a few runs/logs to dial in but this worked for me without issue.

[Motion427]

If I tuner has both SCT and HP Tuners, it's OK. But if the tuner only has HP Tuners. So far I haven't seen a way to log the maf to dial in the fuel trim.

[txcharlie]

...

[txcharlie]

If I tuner has both SCT and HP Tuners, it's OK. But if the tuner only has HP Tuners. So far I haven't seen a way to log the maf to dial in the fuel trim.

You need to pm Eric to get your strategy added. He has to add the PIDs for each strategy, so yours probably hasn't been done. I believe he is on vacation as he hasn't posted lately, so give him time to get it added.

[wbt]

If I tuner has both SCT and HP Tuners, it's OK. But if the tuner only has HP Tuners. So far I haven't seen a way to log the maf to dial in the fuel trim.

I believe some of the HPT method has been discussed in this thread. When I get more time to play with the scanner I'll post up a method that worked for me.

[txcharlie]

I believe some of the HPT method has been discussed in this thread. When I get more time to play with the scanner I'll post up a method that worked for me.

What else could you possibly have to do?

[wbt]

What else could you possibly have to do?

A matter of what to log and how to interpolate. Then make the needed changed to achieve the desired results.

HPT logging is far superior to SCT. It's just a matter of becoming familiar with the "how to".

[txcharlie]

Just giving you are hard time. I appreciate all your contributions to all us newbs.

[imsuperman]

Yeah, definitely appreciate the knowledge being shared.

[wbt]

Just giving you are hard time. I appreciate all your contributions to all us newbs.

10-4. I wish I had all the answers but I don't. I don't mind sharing the small bit I have learned over the past year.

[SultanHassanMasTuning]

Period Hertz
92.63786316 10.79472222
95.89968872 10.42756252
98.8340683 10.1179686
100.3746033 9.962679477
103.7307968 9.640338556
105.5794983 9.471535821
109.6484985 9.120051924
114.7082977 8.717765147
121.1313019 8.255504436
124.9914017 8.000550331
129.4082031 7.727485398
134.6179962 7.428427314
137.5597992 7.269565715
144.4073029 6.92485754
148.3972931 6.738667392
152.9208069 6.539332484
158.0046997 6.32892567
163.9683075 6.098739539
171.1681976 5.842206752
179.8009033 5.561707319
190.7662964 5.242016116
199.0641022 5.023507449
205.1898041 4.873536502
216.050705 4.628543102
233.8838043 4.275627391
251.4129944 3.977519151
258.2694092 3.871925844
273.9158936 3.650755665
294.7810974 3.392347775
307.9367981 3.24741962
330.5310059 3.025434777
392.7210083 2.546336913
455.9849854 2.193054667
489.5109863 2.04285507
534.1300049 1.872203379
598.5789795 1.670623317
714.7479858 1.399094534
933.9140015 1.070762403
1080.475952 0.925518053
1400 0.714285714



quick conversion

[txcharlie]

Update on my MAF issues. I have begun to look at non tune issues that may cause my problems.
When I crank my car cold with vacuum off of regulator, it reads 58lbs. Right where is it supposed to be. Plug in the vacuum and it drops to 51lbs.
After a 20 minute drive, I check it again and with vacuum off it reads 51lbs and drops to 44lbs with vacuum plugged in.
I've been in contact with the fuel system vendor and he referred me to the regulator manufacturer. I have sent them an email requesting support, so we will see what they say.
Guess I should have been looking at non tune issues sooner, but I just figured I was doing something wrong in the tune.

[txcharlie]

10-4. I wish I had all the answers but I don't. I don't mind sharing the small bit I have learned over the past year.

I've been doing it about half as long as you, but I don't seem to be retaining info as well as I used to. I guess age is catching up to me.

[kaineoutlaw]

Are the histograms working in the new scanner? If so i cant figure out how to work them lol so if anyone has a set up w histogram for the copperhead w 2.25 and feel like sharing please do lol

[jchambers]

I apologize for asking on this thread but would anyone know the airflow limit on the stock Coyote MAF? I seem to be flat lining at 86lbs on the datalog so I'm wonder if I'm hitting a limit. Thank you.

86.69 #/min is merely a limit for the OBDII PID dimensioning. In other works, the data value of the PID is clipped at 86.69 #/min but the MAF will continue to register and the PCM continue to calculate above this clip. Its only the data output that is clipped.

[imsuperman]

86.69 #/min is merely a limit for the OBDII PID dimensioning. In other works, the data value of the PID is clipped at 86.69 #/min but the MAF will continue to register and the PCM continue to calculate above this clip. Its only the data output that is clipped.

Ok, thanks for the info. Just wanted to make sure I didn't need to scale anything.

[kaineoutlaw]

So how about making a histogram for maf in 2.25?

[txcharlie]

So how about making a histogram for maf in 2.25?

I have asked the same question and never got a response.

[Plimmer]

What is the difference between MAF Airflow vs Voltage and MAF Airflow vs Period. In other words which table is being used by the PCM and do you need to calibrate both tables?

[caniggia]

Coyote period, 4.6 voltage.