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Author Topic: Audi rs4 b5 egt sensor upgrade from rs6  (Read 15129 times)
ported2flow
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« on: May 22, 2012, 05:49:52 AM »

Hi
I have read on the s4 wiki page that it's possible
To upgrade the ori egt sensors to the rs6 ones so the
Actual real temperature is shown in the measureblock but it's needed
To recalibrate the ecu?

Who has done that? I wanna do it on my ecu some hints were cool

Thanks a lot
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ported2flow
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« Reply #1 on: May 22, 2012, 06:16:15 AM »

"If you see block 034 EGTs hitting 750 or 800 or 850, those values have never been, are not and will never be actual EGTs. The only real EGTs are in block 112. If you want to know what they are when they're below 945, then you have to use RS6 sensors with adequate programming, so you get a range of -40 to 1100°C and then you will know what your real EGTs are."

I ment this from s4 wiki or did I get it wrong and I just have to connect the sensors normally to the wires?

Thx
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RS4boost
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« Reply #2 on: May 22, 2012, 12:32:51 PM »

Hi,

in the original wirediagram, both EGT sensors have a equal pinout.
So you can change it plug&play.
The 100ms PWM timing to the ECU, is also equal.

But you must import "TABGTA" and "DTPATS" from the RS6 ECU to your S or RS4 ECU.

In the RS6 "TABGTA" you can see that the EGT sensor have a measurement bandwidth from -40 till 1110 degree Celsius.
The RS4 / S4 EGT sensor can only measure between 940 and 1035 degree Celsius.

The "DTPATS" stands for the PWM periodical timing tolerance (RS4 = 50ms, RS6 = 20ms).

If the RS6 sensors are build in, and "TBGTA" and "DTPATS" are changed, you can see in VCDS measurementblock 112, also now realtime temperatures under 940 degree Celsius in your ECU.

Tom

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nehalem
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« Reply #3 on: May 22, 2012, 03:33:45 PM »

Hi,

in the original wirediagram, both EGT sensors have a equal pinout.
So you can change it plug&play.
The 100ms PWM timing to the ECU, is also equal.

But you must import "TABGTA" and "DTPATS" from the RS6 ECU to your S or RS4 ECU.

In the RS6 "TABGTA" you can see that the EGT sensor have a measurement bandwidth from -40 till 1110 degree Celsius.
The RS4 / S4 EGT sensor can only measure between 940 and 1035 degree Celsius.

The "DTPATS" stands for the PWM periodical timing tolerance (RS4 = 50ms, RS6 = 20ms).

If the RS6 sensors are build in, and "TBGTA" and "DTPATS" are changed, you can see in VCDS measurementblock 112, also now realtime temperatures under 940 degree Celsius in your ECU.

Tom




ok, awesome info, someone toss this on the wiki...
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ported2flow
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« Reply #4 on: May 23, 2012, 04:58:23 PM »

Tommmm youuu made my day!!!! Great!

Will test that on my 3.2T!!
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nehalem
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« Reply #5 on: May 23, 2012, 10:53:03 PM »

Do you have address information for these takes?
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nyet
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« Reply #6 on: May 23, 2012, 10:59:01 PM »

searching mbox gives me

 TABGTA (0x1C4DE, axis 1C4BA)
 DTPATS (0x192F0)

Also, can you paste the RS6 values of TABGTA?
« Last Edit: May 23, 2012, 11:14:08 PM by nyet » Logged

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RS4boost
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« Reply #7 on: May 24, 2012, 12:32:47 PM »

In TABGTA you also have to change the X-Axis Data!


RS4 - 8D0907551K - 0261207001 - 1037360387

TABGTA (18x1 - 16bit LoHi) - degree celsius - at 1CC78 / X-Axis - %PWM - at 1CC54

DTPATS (1x1 - 8bit) - ms - at 19572

**************************************************************************
RS6 - 4D1907558 - 0261207857- 1037366304

TABGTA (18x1 - 16bit LoHi) - degree celsius - at 1F5CA / X-Axis - %PWM - at 1F5A6

DTPATS (1x1 - 8bit) - ms - at 1971E

RS4 WinOLS


RS6 WinOLS

« Last Edit: May 24, 2012, 02:31:44 PM by RS4boost » Logged

nyet
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« Reply #8 on: May 24, 2012, 01:59:19 PM »

I assume you mean TABGTA not TABGTS


Also, the s4 EGT PWM doesn't have very good resolution... can this be improved? with the wider range of the rs6 egts it might be an issue
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AndiS4
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« Reply #9 on: May 24, 2012, 02:05:53 PM »

Might it be possible to change the axis non linear, to aim a higher resolution on critical temps?
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RS4boost
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« Reply #10 on: May 24, 2012, 02:35:10 PM »

I assume you mean TABGTA not TABGTS


Also, the s4 EGT PWM doesn't have very good resolution... can this be improved? with the wider range of the rs6 egts it might be an issue

Sorry, you're right... I mean TABGTA.
I have fixed it  Wink
« Last Edit: May 24, 2012, 03:34:47 PM by RS4boost » Logged

nyet
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« Reply #11 on: May 24, 2012, 02:40:20 PM »

Might it be possible to change the axis non linear, to aim a higher resolution on critical temps?

Nope, the resolution problem is on the pwm side...
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RS4boost
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« Reply #12 on: May 24, 2012, 03:24:10 PM »

The RS6 EGTS resolution is 1% = 12.5 degree

A non linear axis makes sense.

With a asymetric axis you can realise a narrow band measurement at high critical temperatures in the region of TABGSS (980 degree celsius) and a wide band measurement at low degrees.
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silentbob
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« Reply #13 on: May 24, 2012, 11:24:29 PM »

The RS6 EGTS resolution is 1% = 12.5 degree

A non linear axis makes sense.

With a asymetric axis you can realise a narrow band measurement at high critical temperatures in the region of TABGSS (980 degree celsius) and a wide band measurement at low degrees.


The sensor output is linear from -40 - 1110°C so a non linear axis won't change anything  Wink
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silentbob
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« Reply #14 on: May 24, 2012, 11:53:59 PM »

I assume you mean TABGTA not TABGTS


Also, the s4 EGT PWM doesn't have very good resolution... can this be improved? with the wider range of the rs6 egts it might be an issue

I have never actually measured the PWM with a oscilloscope but what I can say is that the "RS6 type" sensors are still used by OEMs for calibrating the EGT model on turbo cars without a sensor and they work just fine compared to type K thermocouples (just a bit slow on dynamic situations because of the big diameter).

So no worries here.
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