Only read if interested!
Currently I am involved in constructing a label file for the FSI ECU, a small portion of which is the coolant groups 130-137 and along with my contributions to Evros's current coolant thread I have have become intrigued with FSI coolant warm-up, how it behaves and what exactly these groups are telling us.
Below is a detailed look at the VCDS log of groups 130 -132 during a test run from cold in my FSI, that I undertook to gain more data on FSI coolant warm-up.
Background
Ambient temperature (from dash) = 8.5℃. Cabin climate off. The route was a fairly brisk run along country roads with intermittent slows spells through three villages and the return journey. The car was stationary with engine off for a few minutes in the middle while I briefly did some shopping!
The log is of this VCDS screen and is 1760 lines long.
The start of the log.
The same view but tied up with duplicated columns hidden and the elapsed time changed from seconds formatted to mins:secs. ( Sorry noticed later I missed a duplicated column.)
Note also hidden is column F, the 'Fan overrun' field that displays 'OFF' throughout. I know @PlasticMac has an interesting point about this and I will let Mac comment.
'
With sampling rate of about 1 second not a lot happens quickly, in fact it takes 27 seconds for the coolant temperature to rise 1℃ but warm-up speeds up a little.
This slow increase in coolant temperature continues, painfully slowly when looking for a change over several hundred lines of log. After eight and half minutes the magical 90℃ is reached. Note the dash temperature gauge is in agreement to within a couple of degrees at this point but as said many times stays there from this point on.
The climb in coolant temperature continues towards the setpoint of 110℃ and hopefully more interesting points to look at and when it arrives it is not what I expected at all! Bizarre the ECU starts to drop the engine and radiator outlet setpoints???? What is the point of that? It knows the coolant temperature is nowhere near the normal 110℃ why is it doing things? if the ECU is worried about the rate of rise of the engine coolant temperature then why it does it not just open the thermostat. Somebody please explain.
Andy
Currently I am involved in constructing a label file for the FSI ECU, a small portion of which is the coolant groups 130-137 and along with my contributions to Evros's current coolant thread I have have become intrigued with FSI coolant warm-up, how it behaves and what exactly these groups are telling us.
Below is a detailed look at the VCDS log of groups 130 -132 during a test run from cold in my FSI, that I undertook to gain more data on FSI coolant warm-up.
Background
Ambient temperature (from dash) = 8.5℃. Cabin climate off. The route was a fairly brisk run along country roads with intermittent slows spells through three villages and the return journey. The car was stationary with engine off for a few minutes in the middle while I briefly did some shopping!
The log is of this VCDS screen and is 1760 lines long.
The start of the log.
The same view but tied up with duplicated columns hidden and the elapsed time changed from seconds formatted to mins:secs. ( Sorry noticed later I missed a duplicated column.)
Note also hidden is column F, the 'Fan overrun' field that displays 'OFF' throughout. I know @PlasticMac has an interesting point about this and I will let Mac comment.
'
With sampling rate of about 1 second not a lot happens quickly, in fact it takes 27 seconds for the coolant temperature to rise 1℃ but warm-up speeds up a little.
This slow increase in coolant temperature continues, painfully slowly when looking for a change over several hundred lines of log. After eight and half minutes the magical 90℃ is reached. Note the dash temperature gauge is in agreement to within a couple of degrees at this point but as said many times stays there from this point on.
The climb in coolant temperature continues towards the setpoint of 110℃ and hopefully more interesting points to look at and when it arrives it is not what I expected at all! Bizarre the ECU starts to drop the engine and radiator outlet setpoints???? What is the point of that? It knows the coolant temperature is nowhere near the normal 110℃ why is it doing things? if the ECU is worried about the rate of rise of the engine coolant temperature then why it does it not just open the thermostat. Somebody please explain.
Andy