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Old 07-13-2011, 08:23 PM   #1
SiFlyBy
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Member#: 250910
Join Date: Jul 2010
Chapter/Region: MWSOC
Location: Bismarck, ND
Vehicle:
2002 WRX
Blue

Default GM IAT scaling for RR SD ROM

I promise I searched for an hour or so trying to find the answer. I am doing some upgrades and currently running RR with GroupN SD rom with a blow-through MAF/IAT post IC and before the TB....Looking to ditch the MAF/IAT and just use a GM IAT.

Can someone please give me the sensor scaling values that I would need to enter into the ROM in order for it to read correctly.

Thank you in advance,
Chris
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Old 07-14-2011, 04:53 AM   #2
Reuna
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Member#: 151496
Join Date: Jun 2007
Default

I'm using:
Code:
[Table2D]
0.21    0.36    0.52    0.67    0.83    0.99    1.14    1.30    1.46    1.61    1.77    1.92    2.08    2.24    2.39    2.55    2.71    2.86    3.02    3.17    3.33    3.49    3.64    3.80    3.96    4.11    4.27    4.42    4.58    4.74
248,0    248,0    237,4    219,2    203,8    191,2    181,1    171,5    162,8    155,2    147,7    141,1    134,4    127,9    121,9    115,8    109,6    103,9    97,6    91,7    85,1    78,3    71,4    63,6    54,9    45,5    33,7    19,1    -4,9    -40,0
Don't know if it is exactly right at all operating temps but seems to match ambient temp when engine is not running. The sensor is mounted to intake manifold.

I had to adjust "Speed density load compensation (IAT)" a bit in order to get consistent AFRs throughout different temperatures:
Code:
[Table2D]
-40    -22    -4    14    32    50    68    86    104    122    140    158    176    194    212    230
34,34    28,89    23,82    19,10    14,70    10,62    6,81    3,27    2,97    -0,12    -3,01    -5,73    -8,31    -10,75    -13,09    -15,36
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Old 07-14-2011, 06:21 AM   #3
SiFlyBy
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Member#: 250910
Join Date: Jul 2010
Chapter/Region: MWSOC
Location: Bismarck, ND
Vehicle:
2002 WRX
Blue

Default

That will probably do as a decent starting point for me.

THANK YOU VERY MUCH!

Chris
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