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Old Thu, Jun-14-2018, 06:35:46 PM   #1
e36 323ti
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Default Exhaust Gas Temperatures (EGT)?

In my airVent Display I have the opportunity to show the Exhaust Gas Temperature (EGT).

The value shown in the airVent Display is identical to the value read by Tools32.

According to Tools32 the EGT is represented by one byte with 1:1 conversion.; i.e 0-255 degC.

Measuring the EGT sensor between p5 and p10 on the MSS54-X60002 reads 217 Ohm @~20degC.

During normal driving the EGT is in the range 10-30 degC.

I would have expected the EGT to be lot higher than that.

Any opinions/knowledge?
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Old Fri, Jun-15-2018, 04:05:53 AM   #2
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Default Re: Exhaust Gas Temperatures (EGT)?

I don’t think the tool32 formula is correct. I’ll look it up later
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Old Fri, Jun-15-2018, 07:46:49 AM   #3
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Default Re: Exhaust Gas Temperatures (EGT)?

Is it an RTD with 200ohm@0c? Apporoimate observed slope 0.85ohm/deg. Standard is 0.77ohm/deg


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Old Fri, Jun-15-2018, 02:39:27 PM   #4
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Default Re: Exhaust Gas Temperatures (EGT)?

EGT should be around 500C.
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Old Fri, Jun-15-2018, 05:22:46 PM   #5
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Default Re: Exhaust Gas Temperatures (EGT)?

Quote:
Originally Posted by e36 323ti View Post
During normal driving the EGT is in the range 10-30 degC.
Ha ha yeah some equation must be wrong. I assume that's happening in the DME itself, and there's not some part of the EDIABAS files that do units conversion or anything like that?

As menched, should be 500-600ish in C.
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Old Fri, Jun-15-2018, 06:55:01 PM   #6
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Default Re: Exhaust Gas Temperatures (EGT)?

Quote:
Originally Posted by geargrndr View Post
I assume that's happening in the DME itself, and there's not some part of the EDIABAS files that do units conversion or anything like that?

As menched, should be 500-600ish in C.
The conversion is done in tools32 and not in the DME.

The temp sensor location (item 8) is just before the cat inlet:

Last edited by e36 323ti; Fri, Jun-15-2018 at 07:32:07 PM.
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Old Sat, Jun-16-2018, 05:25:00 PM   #7
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Default Re: Exhaust Gas Temperatures (EGT)?

Quote:
Originally Posted by jared212 View Post
Is it an RTD with 200ohm@0c? Apporoimate observed slope 0.85ohm/deg. Standard is 0.77ohm/deg


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Yes, most likely a PT200.

Quote:
Originally Posted by terraphantm View Post
I don’t think the tool32 formula is correct.
I think you are correct.

-------------------------

I hooked up an MSS54HP in my bench and attached a Fluke Process Calibrator to the EGT input on the MSS54HP. Read the KBUS respons when varying the resistance (effectively simulating the EGT sensor). Could then map resistance to the values reported via the KBUS.

Next I used the Callendar-Van Duesen equation solved for T>0 and calculated the tempearatures from the resistance values (T_CVD).

Finally I looked up the datasheet for an Amphenol PT200 EGT (pdf link) and compared with my result.

The temperatures calculated from the Callendar-Van Duesen equation shows increments of 15.7 degC in average. Comparing the calculated T_CVD, the data from the Amphenol PT200 EGT and KBUS*16 it is clear that the EGT is a PT200 as well as that the Tools32 formula is incorrect. Multiplying the KBUS values by 16 seems like an appropriate solution...



Another lesson learned is that if the resistance goes above 944 Ohm or below 174 Ohm the MSS54/MSS54HP reports error.

After updating the airVent Display software with the above findings, the EGT now shows expected values.

I think I conclude with problem solved :-)

Last edited by e36 323ti; Sun, Jun-17-2018 at 03:17:05 PM.
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Discussing Exhaust Gas Temperatures (EGT)? in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)