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Old Nov 11, 2009, 06:58 AM
  #16  
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Originally Posted by mrfred View Post
MAT patch is not needed for 9653 SD ROMs. IAT becomes MAT with the SD patch on this ROM regardless of whether the fuel temp or IAT ADC is used.
Really? So the MAT patch for 96530006 is just needed to log from the fuel temp ADC when not on SD and if running SD, the patch is not needed and logging will be from the MAF IAT adc...even with the sensor physically wired into the fuel temp adc?
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Old Nov 11, 2009, 07:06 AM
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"SD Option: IAT Input for MAT - Use 0x03, Fuel Temp ADC_0E for MAT - Use 0x0E"

That must be the only pointer needed to use ADC_0E (Fuel Temp ADC) in place of ADC_03 (IAT ADC). I assume it just changes the RAM look up from one ADC to the other and the RAM Address typically used for IAT is still used through out the entire ECU?
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Old Nov 11, 2009, 07:07 AM
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Originally Posted by l2r99gst View Post
Really? So the MAT patch for 96530006 is just needed to log from the fuel temp ADC when not on SD and if running SD, the patch is not needed and logging will be from the MAF IAT adc...even with the sensor physically wired into the fuel temp adc?
There is an option in the SD xml to set which ADC input (IAT or Fuel Temp) is read into the IAT scaling code. It was left out of the 96531706 xml.
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Old Nov 11, 2009, 07:37 AM
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Originally Posted by mrfred View Post
There is an option in the SD xml to set which ADC input (IAT or Fuel Temp) is read into the IAT scaling code. It was left out of the 96531706 xml.
I assume you are referring to the setting I mentioned above?

Attached Thumbnails Speed Density MAT-sd-tables.jpg  
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Old Nov 11, 2009, 07:46 AM
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Originally Posted by 03whitegsr View Post
I assume you are referring to the setting I mentioned above?

...
Yep, that's it.
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Old Nov 11, 2009, 07:49 AM
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Originally Posted by mrfred View Post
There is an option in the SD xml to set which ADC input (IAT or Fuel Temp) is read into the IAT scaling code. It was left out of the 96531706 xml.
Yes, I know that. I haven't even looked at the XMLs provided for the 96531706 ROM as I have had my XMLs all set for a while. I'm well aware of the option of using either the fuel temp adc or maf iat adc.

But, from what I remember from way back when, if using the fuel temp adc, then the mat patch is required, which uses it's own mat scaling table, etc.

Are you saying that isn't true now? We just point the option to fuel temp adc, don't apply the mat patch, and just use the SD IAT scaling table?
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Old Nov 11, 2009, 07:49 AM
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OT, but does anyone know the bolt patern for the GM IAT sensor? I need a bolt to seal one up on my uicp.
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Old Nov 11, 2009, 11:13 AM
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Originally Posted by l2r99gst View Post
Yes, I know that. I haven't even looked at the XMLs provided for the 96531706 ROM as I have had my XMLs all set for a while. I'm well aware of the option of using either the fuel temp adc or maf iat adc.

But, from what I remember from way back when, if using the fuel temp adc, then the mat patch is required, which uses it's own mat scaling table, etc.

Are you saying that isn't true now? We just point the option to fuel temp adc, don't apply the mat patch, and just use the SD IAT scaling table?
Yes, but this is only for the 96531706 ROM. All USDM ROMs need the MAT patch if using the fuel temp ADC.
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Old Nov 11, 2009, 11:14 AM
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Originally Posted by Ph3n1x View Post
OT, but does anyone know the bolt patern for the GM IAT sensor? I need a bolt to seal one up on my uicp.
3/8" NPT. You can get a copper or iron plug at your local hardware store. Don't forget to use some teflon tape on the threads.
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Old Nov 11, 2009, 08:58 PM
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So just to clarify, If I take my GM Air Temp Sensor and wire it to the ecu input for fuel temp all i need to do is place the correct values in the field that says "SD IAT ADC Scaling (Insert MAT Sensor Scaling) under the Speed Density Programming Section? I dont need to worry about the field under MAT that says MAT Scaling?
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Old Nov 11, 2009, 09:02 PM
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Originally Posted by mchuang View Post
So just to clarify, If I take my GM Air Temp Sensor and wire it to the ecu input for fuel temp all i need to do is place the correct values in the field that says "SD IAT ADC Scaling (Insert MAT Sensor Scaling) under the Speed Density Programming Section? I dont need to worry about the field under MAT that says MAT Scaling?
If you are using a 9653XXXX ROM, that is correct.
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Old Nov 11, 2009, 09:08 PM
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So if you are running MAF only and want to log Intake Air Temp after MAF you still need to patch the rom and add the values for MAT Scaling which is what I am doing right now, before I try speed density.
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Old Nov 11, 2009, 10:01 PM
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Originally Posted by mchuang View Post
So if you are running MAF only and want to log Intake Air Temp after MAF you still need to patch the rom and add the values for MAT Scaling which is what I am doing right now, before I try speed density.
Correct.
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Old Oct 14, 2016, 08:48 AM
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In Phenems SD patched rom how can i convert the MAT scaling from Fahrenheit to C ?
rom is 96531706
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Old Oct 14, 2016, 02:19 PM
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Originally Posted by mines5 View Post
In Phenems SD patched rom how can i convert the MAT scaling from Fahrenheit to C ?
rom is 96531706
Add a scaling in degC like this:




Select it here:




Watch your temp scale change to deg C!


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