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Using cluster temperature display to show EGT?

Using cluster temperature display to show EGT?

 
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Matej
GT2256V

141
06-22-2015, 05:07 PM #1
This is probably a silly idea, but has anyone attempted to convert the W201/W124 external temperature display in the cluster to show EGT's instead?
I am not sure if it could be as simple as relocating the external sensor to the manifold/downpipe (stripped of any non-metal parts, and with proper shielding) or if the sensor would get fried immediately, or if the LCD can even display numbers that high (at least 999 would be nice, even better if the Celsius display is used).
Another option could be to wire a proper EGT sensor into the outside temperature sensor harness, though I am not sure how one would make the circuit board display the sensor readouts correctly.
Finally, I suppose it could also be an option to just get a digital EGT gauge and retrofit it behind the temperature display, but I thought it would be nice to use the factory unit for a stock look.
Thanks for any input or ideas.


[Image: 434306d1332710636-outside-temp-gauge-com...-gauge.jpg]
[Image: VDO_4562.jpg]
[Image: europlate-3.jpg]
This post was last modified: 06-22-2015, 05:11 PM by Matej.

Irony.cc
Matej
06-22-2015, 05:07 PM #1

This is probably a silly idea, but has anyone attempted to convert the W201/W124 external temperature display in the cluster to show EGT's instead?
I am not sure if it could be as simple as relocating the external sensor to the manifold/downpipe (stripped of any non-metal parts, and with proper shielding) or if the sensor would get fried immediately, or if the LCD can even display numbers that high (at least 999 would be nice, even better if the Celsius display is used).
Another option could be to wire a proper EGT sensor into the outside temperature sensor harness, though I am not sure how one would make the circuit board display the sensor readouts correctly.
Finally, I suppose it could also be an option to just get a digital EGT gauge and retrofit it behind the temperature display, but I thought it would be nice to use the factory unit for a stock look.
Thanks for any input or ideas.


[Image: 434306d1332710636-outside-temp-gauge-com...-gauge.jpg]
[Image: VDO_4562.jpg]
[Image: europlate-3.jpg]


Irony.cc

Simpler=Better
PORTED HEAD

2,127
06-23-2015, 03:25 PM #2
Figure out what type of thermocouple the stock setup uses (Probably a K type?) and get one rated for your temperature range. The K type I ran on my w123 for EGT was like $12.

Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?
Simpler=Better
06-23-2015, 03:25 PM #2

Figure out what type of thermocouple the stock setup uses (Probably a K type?) and get one rated for your temperature range. The K type I ran on my w123 for EGT was like $12.


Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?

Matej
GT2256V

141
06-24-2015, 01:02 AM #3
So all the thermocouples of the same type will give the same readouts (ideally), thus in theory the Mercedes sensor should be able to convert the signal to the correct temperature as long as the same type is used?
Thanks for the advice, this is all new time.
Guess now I just need to figure out how to identify which type the Mercedes thermocouple is.

Then I can test it by touching the thermocouple on the stove to see if the module can even display numbers that high. Smile

Irony.cc
Matej
06-24-2015, 01:02 AM #3

So all the thermocouples of the same type will give the same readouts (ideally), thus in theory the Mercedes sensor should be able to convert the signal to the correct temperature as long as the same type is used?
Thanks for the advice, this is all new time.
Guess now I just need to figure out how to identify which type the Mercedes thermocouple is.

Then I can test it by touching the thermocouple on the stove to see if the module can even display numbers that high. Smile


Irony.cc

Matej
GT2256V

141
06-24-2015, 01:27 AM #4
Never mind. Upon further research it seems that the stock sensor can show temperature up to 136°F. Guess I will have to go with a regular EGT gauge after all. Smile

Irony.cc
Matej
06-24-2015, 01:27 AM #4

Never mind. Upon further research it seems that the stock sensor can show temperature up to 136°F. Guess I will have to go with a regular EGT gauge after all. Smile


Irony.cc

Simpler=Better
PORTED HEAD

2,127
06-24-2015, 09:19 AM #5
Auber instruments are cheap (~$60) small, have an alarm light, and an alarm output (that can be hooked up to an audible alarm, solenoid to cut fuel, etc.)

Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?
Simpler=Better
06-24-2015, 09:19 AM #5

Auber instruments are cheap (~$60) small, have an alarm light, and an alarm output (that can be hooked up to an audible alarm, solenoid to cut fuel, etc.)


Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?

Petar
7.5mm M pump

459
06-24-2015, 01:33 PM #6
If you could find a digital EGT gauge that would fit instead of the stock temperature display that would be cool. Or use an arduino with a thermocouple interface and use the stock LCD for display
Petar
06-24-2015, 01:33 PM #6

If you could find a digital EGT gauge that would fit instead of the stock temperature display that would be cool. Or use an arduino with a thermocouple interface and use the stock LCD for display

raysorenson
Superturbo

1,162
06-25-2015, 04:16 PM #7
The temp sensor is a thermistor.
raysorenson
06-25-2015, 04:16 PM #7

The temp sensor is a thermistor.

Simpler=Better
PORTED HEAD

2,127
06-26-2015, 10:49 AM #8
(06-25-2015, 04:16 PM)raysorenson The temp sensor is a thermistor.

Then measure the current one, and get one 10x higher resistance.  So that the output iwll read 80*F at 800*F, 110*F at 1100*F, etc.

Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?
Simpler=Better
06-26-2015, 10:49 AM #8

(06-25-2015, 04:16 PM)raysorenson The temp sensor is a thermistor.

Then measure the current one, and get one 10x higher resistance.  So that the output iwll read 80*F at 800*F, 110*F at 1100*F, etc.


Newbie-read this: Cheap Tricks
617.952-220k-Getting built up
larsalan I guess I need to look at this stupid ass drip shit. What you have to like mess with those elements on the pump? What a fucking hassle. then use some wire to hold the throttle open or some shit?

raysorenson
Superturbo

1,162
06-26-2015, 12:06 PM #9
I don't think there's a thermistor that can handle the heat.
raysorenson
06-26-2015, 12:06 PM #9

I don't think there's a thermistor that can handle the heat.

Matej
GT2256V

141
06-26-2015, 04:03 PM #10
Indeed. Already looked into it and there does not seem to be one. Too bad, because using one with a 10x higher resistance is a really clever idea. Smile

Irony.cc
Matej
06-26-2015, 04:03 PM #10

Indeed. Already looked into it and there does not seem to be one. Too bad, because using one with a 10x higher resistance is a really clever idea. Smile


Irony.cc

Petar
7.5mm M pump

459
06-26-2015, 04:31 PM #11
Rube goldberg idea: designe something that will heat the stock sensor to corresponding temperature for a given EGT   Tongue Idea
Petar
06-26-2015, 04:31 PM #11

Rube goldberg idea: designe something that will heat the stock sensor to corresponding temperature for a given EGT   Tongue Idea

 
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