does anyone have a plotted curve for the 1.8T IAT sensor on the audi?
also does anyone have the same on the CLT sensor?
i get some odd readings from the 1.8T (NTC) sensor when i use the 2252/256 patch for IAT.
is it normal to show 6C on a stationary for 2 weeks car, with a foot+ of snow and ambient temp (from car's sensor) -2C?
that was before starting the engine.
on the old PTC sensor i was usually getting a reading of ambient and IAT temp close to eachother on similar conditiions before starting the car.
I always use the 2063/256 patch file for this sensor. I have compared it to the default 17-point curves that can be used in it's place at one time, there was not more than a degree or two difference at that time.
Some fw versions ago CLT from flash table was still 102degC limited. So I prefer to use 17-point curve.
For audi IAT for some reason 1900/256 is best. Then at usual -10....40degC is best equality.
so for IAT sensor (1.8T which is NTC, not PTC) you both use different files?
2036/256
1900/256
for CLT? which one is the best?
recently billman noticed a big difference with the CLT sensor when observing the AC digital CLT reading and comparing it to the VEMS one, and it came closer on warm engine.
Mattias: you use 2036/256 for IAT, and which one for the CLT?
thanks
vasilis
also, does anyone have the 17point curve as well? i would prefer to try that rather than reflasing the ecu.
i need them for 1.8T audi IAT sensor and OEM CLT audi rs2 sensor
is what is referred in the vemstune as 'vems standard IAT sensor' the one similar to 1.8T?
also does the same go for the CLT sensor referred as ' bosch'?
1.8T sensor is close to BOSCH curve.
Quote from: AVP on December 05, 2010, 07:06:29 PMMattias: you use 2036/256 for IAT, and which one for the CLT?
I usually use the same curve to start out with, in case it doesn't match well enough I try another. Bottom line for me is that if it matches well with ambient temperature when the engine has not been run and is really "cold", then I go with that. For the CLT it's not life or death if it shows 85 or 90 C when hot, all I want to know is that it is warmed up and out of warmup enrichment.
i see
so you do follow the ambient temp to start with for the IAT sensor
which patch do you use for the CLT then?
Hi, i am using the 17 point AIR and CLT curve.
First when use the flashtable i see an difference in any table about 3-10 deg.
So i changed the IAT sensor to an GM one and calibrate this with multimeter.....
I do so again with the oem CLT sensor.
Now i have an difference from 1-2deg. C, also very close to the outside temp.
Thomas
can you send me the values of the clt curve?
do you use the same clt sensor that audi uses? or the one from vems?
for the IAT sensor i have the 1.8T sensor, so i will have to use the 17 curve that says bosch
1.8T is an air sensor, not a clt sensor, so there is no bosch curve for MAT on vemstune, only a default for the vems sensor
Quote from: AVP on December 06, 2010, 11:12:56 AM
1.8T is an air sensor, not a clt sensor, so there is no bosch curve for MAT on vemstune, only a default for the vems sensor
You can try 1900/256 or rewrite and little adopt BOSCH curve from CLT.
i dont really mind about the clt sensor, as if i use the bosch curve it should be fine,
im really interested on the IAT sensor because that will have a bigger meaning for me.
the GM sensor curve, does anyone know how that relates to the 1.8T sensor?
seeing the vems shop, apparently i use the same patch that is used for the GM sensor, but i do get a big difference as i mentioned already
ill try and use what curves there are there, but i dont want to change the values by chance, and i dont have a multimeter to do it thorougly either.
Quote from: AVP on December 06, 2010, 07:30:31 AM
i see
so you do follow the ambient temp to start with for the IAT sensor
which patch do you use for the CLT then?
Like I said, I use 2036/256 for both to begin with. Step up or down if the CLT doesn't match well enough.
Is the 1.8T sensor the same as the MAT sensor from the webshop? It's a Beru sensor, and is used on lots of vehicles (Mercedes for one).
apparently not as from the webshop it says to use 2252/256 patch for it, but this is the one i use and i have a difference.
so now i have the clt curve for the audi from thomas, so i will plot the curve with a multimeter for the 1.8T sensor to be more accurate
do you know if i can dip the sensor element in water?
Hi,
Quotedo you know if i can dip the sensor element in water?
yes, no problem, it is not from sugger made..... ;D
Thomas
since these sensors are made to measure air rather than liquids, i am going to try to use the K sensor along with the IAT sensor close together and do measurements of hot and cold using air rather than liquids.
for the hot it is easy, as radiator heat as well as hair dryer would be sufficient to accomodate high temps.
for the cold, im trying to locate some dry ice, or otherwise i will have to improvise with the outdoor snow that is readily found in the UK now.
any other ideas?
Test with ice water and boiling water, combined with ambient temperature measurements. That should get you close enough.
Liquid will only make the heat/cold transfer to the sensor body quicker, a good thing when you want to measure.
I would NOT compare to K-type thermocouples unless properly calibrated to the equipment you are using and even then it's a bad idea for this temperature range. Use something else more appropriate for the temperatures you want to see (i.e not 500+ Celsius).
I bought a ktype sensor that can measure from -50 to + 199C with .1 decimal measurement and then it measures above that with a clarity of + 1 degree. It was fairly cheap and digital, so i think it should be accurate.
i was told that heat and water transfer would interefere with my measurements, as the sensor it self is not sealed, and the K type sensor is always sealed, therefore wanted to make sure im measuring same properties(ie air)
i also found a spare OEM Audi CLT sensor which i will check for the same reasons. For this one, i will use the water method as it is sealed and made to be used for liquids.
still waiting for the parts...