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Speed Density MAT Scaling for IAT Scaling Table on 94171715... Is this right ??

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Speed Density MAT Scaling for IAT Scaling Table on 94171715... Is this right ??

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Old Nov 20, 2014, 01:14 AM
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Speed Density MAT Scaling for IAT Scaling Table on 94171715... Is this right ??

Hey guys,

I've trying to work out the some cold starting issues with an Evo I just bought that's tuned on Speed Density and E85 and I came across the values below in the "SD MAT Scaling for IAT Scaling Table." These values definitely look wacky and incorrect to me. Can anyone confirm if these values are right and if not, give me the proper values? Thanks!!

P.S. I know it's a little hard to tell what's what, but basically the first number in each line is the MAT sensor ADC Volts column# and the number after the space in each line is from the degrees fahrenheit column

MAT Sensor ADC Volts Fahrenheit
0.117647059 5907.02
0.137254902 5907.02
0.156862745 5721.26
0.176470588 5397.62
0.196078431 5120.24
0.215686275 4888.94
0.235294118 4703.9
0.254901961 4518.86
0.274509804 4334
0.294117647 4195.22
0.31372549 4102.52
0.333333333 3963.92
0.352941176 3871.22
0.37254902 3732.62
0.392156863 3640.1
0.411764706 3547.58
0.431372549 3455.06
0.450980392 3362.54
0.470588235 3270.02
0.490196078 3177.5
0.509803922 3084.98
0.529411765 2992.46
0.549019608 2899.94
0.568627451 2807.42
0.588235294 2714.9
0.607843137 2622.38
0.62745098 2529.86
0.647058824 2437.34
0.666666667 2344.82
0.68627451 2252.3
0.705882353 2159.78
0.725490196 2067.26
0.764705882 1974.74
0.784313725 1882.22
0.803921569 1789.7
0.823529412 1697.18
0.843137255 1604.66
0.882352941 1512.14
0.901960784 1419.62
0.921568627 1327.1
0.960784314 1234.58
0.980392157 1142.06
1 1049.54
1.039215686 957.02
1.058823529 864.5
1.098039216 771.98
1.137254902 679.46
1.156862745 586.94
1.196078431 494.42
1.235294118 401.9
1.254901961 309.38
1.294117647 216.86
1.333333333 124.34
1.37254902 77.9
1.411764706 -14.62
1.450980392 -107.14
1.490196078 -199.66
1.529411765 -292.18
1.568627451 -384.7
1.607843137 -477.22
1.647058824 -569.74
1.68627451 -662.26
1.745098039 -754.78
1.784313725 -847.3
1.823529412 -939.82
1.882352941 -1032.34
1.921568627 -1171.3
1.960784314 -1310.08
2.019607843 -1495.3
2.058823529 -1765.3
2.117647059 31.82
2.176470588 -5481.76
2.215686275 31.82
2.254901961 -5463.76
2.31372549 57.02
2.37254902 33.08
2.431372549 33.26
2.470588235 33.44
2.549019608 33.62
2.588235294 33.8
2.647058824 33.98
2.705882353 34.16
2.745098039 34.34
2.803921569 34.52
2.862745098 34.7
2.901960784 34.88
2.960784314 35.06
3.019607843 35.24
3.058823529 35.42
3.117647059 35.6
3.176470588 35.78
3.215686275 35.96
3.254901961 36.14
3.31372549 36.32
3.37254902 36.5
3.411764706 36.68
3.450980392 36.86
3.509803922 37.04
3.549019608 37.22
3.588235294 37.4
3.647058824 37.58
3.68627451 37.76
3.725490196 37.94
3.764705882 38.12
3.803921569 38.3
3.843137255 38.48
3.882352941 38.66
3.921568627 39.02
3.960784314 39.2
3.980392157 39.38
4.019607843 39.56
4.058823529 39.74
4.098039216 40.1
4.117647059 40.28
4.156862745 40.46
4.176470588 40.82
4.215686275 41
4.235294118 41.18
4.254901961 41.54
4.294117647 41.72
4.31372549 42.08
4.333333333 42.44
4.352941176 42.62
4.37254902 42.98
4.392156863 43.34
4.411764706 43.52
4.431372549 43.88
4.450980392 44.24
4.470588235 44.6
4.490196078 44.96
4.509803922 45.32
4.529411765 45.68
4.549019608 46.04
4.568627451 46.4
4.588235294 46.76
4.607843137 47.12
4.62745098 47.48
4.647058824 48.02
4.666666667 48.38
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Old Nov 20, 2014, 07:10 AM
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Bump. Can someone check this for me please?
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Old Nov 21, 2014, 07:28 AM
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Old Nov 21, 2014, 05:54 PM
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Which sensor are you using? GM IAT?

If so this is the 121 element scaling table with Volts ADC in the first column and Deg F in the second:

0.102639302
0.112414294.8
0.12219287.6
0.131965282.2
0.14174276.8
0.156403269.6
0.180841258.8
0.200391251.6
0.229717242.6
0.254154235.4
0.28348228.2
0.307918222.8
0.332356217.4
0.361681212
0.391007206.6
0.42522201.2
0.464321195.8
0.508309190.4
0.552297185
0.601173179.6
0.654936174.2
0.694037170.6
0.733138167
0.777126163.4
0.826002159.8
0.874878156.2
0.923754152.6
0.977517149
1.03617145.4
1.09482141.8
1.15836138.2
1.19257136.4
1.22678134.6
1.261132.8
1.29521131
1.33431129.2
1.36852127.4
1.40762125.6
1.44673123.8
1.48583122
1.52493120.2
1.56403118.4
1.60802116.6
1.652114.8
1.69599113
1.73998111.2
1.78397109.4
1.83284107.6
1.87683105.8
1.92082104
1.9697102.2
2.01857100.4
2.0625698.6
2.1163296.8
2.165295
2.2140893.2
2.2629591.4
2.3167289.6
2.3655987.8
2.4193586
2.4682384.2
2.5219982.4
2.5757680.6
2.6295278.8
2.678477
2.7321675.2
2.7859273.4
2.834871.6
2.8885669.8
2.9423368
2.991266.2
3.0449764.4
3.0938462.6
3.1476160.8
3.1964859
3.2453657.2
3.2942355.4
3.3431153.6
3.3919851.8
3.4359750
3.4848548.2
3.5288446.4
3.5777144.6
3.621742.8
3.660841
3.7047939.2
3.7487837.4
3.7878835.6
3.8220933.8
3.8611932
3.9002930.2
3.9345128.4
3.9736126.6
4.0078224.8
4.0420323
4.0713621.2
4.1006819.4
4.134917.6
4.1642215.8
4.1886614
4.2179912.2
4.2424210.4
4.266868.6
4.29136.8
4.315745
4.340183.2
4.359731.4
4.37928-0.4
4.39883-2.2
4.41838-4
4.43793-5.8
4.45748-7.6
4.47214-9.4
4.50147-13
4.53079-16.6
4.55523-20.2
4.57967-23.8
4.59922-27.4
4.61877-31
4.63343-34.6
4.64809-38.2

Last edited by cdrinkh2o; Nov 21, 2014 at 07:29 PM. Reason: Added GM IAT scaling table
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Old Nov 21, 2014, 10:10 PM
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The car is supposedly tuned with the fuel temp sensor
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Old Nov 23, 2014, 07:31 AM
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change the scaling from temp scale fuel to temp scale
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Old Nov 23, 2014, 09:10 PM
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Originally Posted by todd6027 View Post
change the scaling from temp scale fuel to temp scale
That fixed it Thanks a bunch!!
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Old Nov 24, 2014, 12:16 PM
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Originally Posted by Ian0611 View Post
That fixed it Thanks a bunch!!
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Old Oct 23, 2017, 11:18 AM
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I know this is an old post but worth a shot. I am using SD 2.0 with 94172715. I have copied the above into the SD MAT Scaling for IAT scaling table. Do I also need to copy this to the MAT scaling under MAT? This was set to the TempscaleFuel. I have switched it to Tempscale. But do i leave in the values that are currently there?

MAT sensor volts start at 1.007 and go to 4.013. Is that the stock values? Should i switch this to the above?
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