2016 Camaro E92 MAF Scale question.

[SPi]

OK thanks joecar

[EFI Tuning]

I'm told that GM put that jump in there... it's not possible to rescale the axis.

It's possible. Just not with EFI Live GM did it the way they did to maximize the resolution of the actual operating range.

[Wichita Dyno]

So what is the latest on this? Can we not rescale with this software?

[Wichita Dyno]

So I will take it the silence means no?

[SPi]

It can be rescaled, just not with EFI Live yet

[Blacky]

So what is the latest on this? Can we not rescale with this software?

The MAF axis is just a non-visible calibration in EFILive. I don't see any reason why it can't be made visible so it can be re-scaled by the tuner. I'll add it to the list of things for the next update.

Meanwhile the way it currently determines the lookup values from the MAF table between 8550 and 15000 is via linear interpolation.

For example assuming the last two entries in the table are:
8550=360
15000=1150
then if the Hz value was 12000, then the value returned from the lookup table is computed by the ECM as follows:

g/s = 360+v*(y/x) where
v = 12000-8550
y = 1150-360
x = 15000-8550

so the lookup value when Hz=12000 is calculated as: 360+(12000-8550)*(1150-360)/(15000-8550)
360+3450*(790/6450) =
360+3450*0.12248 =
782g/s

To help with tuning right now, here's what the values are for various points in between the last two cells:

   Hz     g/s
 8550     360
 8600     366
 8650     372
 8700     378
 8750     384
 8800     391
 8850     397
 8900     403
 8950     409
 9000     415
 9050     421
 9100     427
 9150     433
 9200     440
 9250     446
 9300     452
 9350     458
 9400     464
 9450     470
 9500     476
 9550     482
 9600     489
 9650     495
 9700     501
 9750     507
 9800     513
 9850     519
 9900     525
 9950     531
10000     538
10050     544
10100     550
10150     556
10200     562
10250     568
10300     574
10350     580
10400     587
10450     593
10500     599
10550     605
10600     611
10650     617
10700     623
10750     629
10800     636
10850     642
10900     648
10950     654
11000     660
11050     666
11100     672
11150     678
11200     685
11250     691
11300     697
11350     703
11400     709
11450     715
11500     721
11550     727
11600     734
11650     740
11700     746
11750     752
11800     758
11850     764
11900     770
11950     776
12000     783
12050     789
12100     795
12150     801
12200     807
12250     813
12300     819
12350     825
12400     832
12450     838
12500     844
12550     850
12600     856
12650     862
12700     868
12750     874
12800     881
12850     887
12900     893
12950     899
13000     905
13050     911
13100     917
13150     923
13200     930
13250     936
13300     942
13350     948
13400     954
13450     960
13500     966
13550     972
13600     979
13650     985
13700     991
13750     997
13800    1003
13850    1009
13900    1015
13950    1021
14000    1028
14050    1034
14100    1040
14150    1046
14200    1052
14250    1058
14300    1064
14350    1070
14400    1077
14450    1083
14500    1089
14550    1095
14600    1101
14650    1107
14700    1113
14750    1119
14800    1126
14850    1132
14900    1138
14950    1144
15000    1150

Regards
Paul

[joecar]

Paul, thanks!

[Blacky]

Here's what the entire table (when extrapolated) would look like when plotted in Excel.



Regards
Paul

[joecar]

They go linear above 8500Hz...?

[Blacky]

They go linear above 8500Hz...?

Yes. All data between cell values in all tables is interpreted using linear interpolation.
https://en.wikipedia.org/wiki/Linear_interpolation

Regards
Paul