Ecumaster forum

Hi,

i want to use the DT3 mainly to convert from AFM to MAP.
But in the stock Engine also the Temp sensor sits in the AFM, so when i will remove it i have to install another Sensor somewhere and connect the original ecu to it ?

Or how is it done normaly ?
Can someone explain more how it works right?
For now I just used the emu in other cars but now i want to use the DT3 because in this car I just want to remove the AFM.

Thx

The Bosch's AFM has an independent temp sensor which means an AFM always has a separate pin for the NTK (ground pin is common with the AFM).
Older AFM (working on 12v like in L-Jetronic) had a something like 0.5k @20C sensors, I don't think you can find them stand-alone, you'd have to remove the AFM's one and install it in the intake.
More recent (Motronic) AFM's had a standard Bosch 2.5k @20C sensor. Most (or perhaps all) Bosch temp sensors are of the same type. Note that sensors from other brands (Siemens, Marelli, Lucas, ...) are also 2.5k @20c but their temperature functions are all different, I've compared several brands and never found similar sensors. So you can use a std Bosch 2.5K sensor in place of the original one.
Beware of the sensor's location. A sensor in the AFM is weakly impacted by the raise of temperature during long idle phases, while one inside the plenum will measure air and plenum temperature fluctuations. It's perhaps better to keep it before the throttle.

Thank you for advice ! somehow it sounds very logic, why i did not get this idea

Jep...you are completly right.....the location is very important i have this experience already made withe my emu installed in other car.

I encourage most people to install a resistor in place of the stock sensor, then use a GM style IAT sensor connected to the DET3 for corrections.