firefox

Criag..

Its not the sensor I was thinking of.. I had a look at a V last night..

where exactly is this sensor you are talking about ?

At the base of the air filter box ? at the front ? back ? what does the sensor look like ? details...

J.

Craig H

J,
Off the top of my head:
It plugged into the upper part of the airbox and looks like a probe?
I'm gonna pop down at lunch and take a look.

Cheers

Craig

firefox

It is the same sensor (air temp/density sensor).

It will be ok to mount it next to the air filter.... but not in such a place that it detects wind blowing by (wind chill).

This sensor is designed to measure the air going into the filter.... so mount it infront/next to the filter using a bracket.

Ideally it should be mounted in the inlet after the air filter, this will remove any spurious readings.... but as I stated before.. its not the most sensitive sort of sensor about...

J.

Bob Rawle

Careful ... its designed to measure ambient air, have you left the original duct in place ? Its position ought to be generally the same in order for it to provide similar info. to the ecu. Underbonnet temp is similar for both an induction kit or the standard box when the car is moving. (I've measured it ... I know sad !!) The readings whilst the car is moving are the most important, the ecu will be callibrated for this.

Wind chill caused by latent heat of evaporation on skin ... sensors do not have skin and so nothing to evaporate so no wind chill. To a sensor temp is temp wether air is moving or not.

Craig H

Bob,
When you say the duct, do you mean the piece above the right headlight?
Would it be best to fit it somehow into the induction kit?
Could this cause ill effects?

Cheers

Craig

firefox

Bob..

You do have to take into account wind chill.... if its a moist day water droplets can form on the sensor.. and the wind will then chill the sensor... otherwise why didnt they just mount the sensor in the open air ?

The sensor is crude... its no thermo couple...

I think you will find the ducting Bob is referring to is the one that comes off the front of the cra...then goes into the wing... them pops back out again and connects onto the original air box.

J.

Bob Rawle

Firefox, the sensor is not that crude, its a ptc thermistor and is reasonably sensitive. Wind chill ... have you checked this ... I have and it makes no difference, why fit it there ? because its an Inlet Air Temp sensor and thats where the air enters the engine, it can therefore take some account of heat soak. Temp there will be only about 2 deg higher than outside when the car is rolling.

Air temp sensors are fitted to most cars these days, they just tell you what the outside world is doing and give ice warnings in most cases (I know that you will be aware, just for the benefit of those that aren't) The sensors are similar, they are usually mounted in the bumper in the air stream and can get extremely wet, they don't read any colder after driving through a puddle though.

It will probably be the most sensitive in the range minus 10 to plus 60 deg centigrade. (a bit of an educated guess)