Ok, i could have searched for the relavent thread, but i can\'t be bothered! :p
I have just fitted and tested Jonathan_F\'s hi speed air temp sensor, and gotta say, it really is high speed. Although, there is a bad point: means it goes up really quickly too! But as soon as you move away, the quicker the better too, it goes down. If you slow down (speed wise), the temps start to go up again (This was town driving). I\'m very impressed.
For example, waiting at a junction i saw the tempas 34 degrees. Move away, not particularly quickly, and the next time i look (Merely a couple of seconds later) the temp was 31 degrees. Very impressed.
Can\'t wait to see what it does on the motorway.
Awesome! Have you relocated it to the intake elbow? I might have to get me one of these, how easy are they to get hold of and what\'s the damage?
No, i decided not to relocate the air temp sensor. The reason being, because yes you would see cooler temps, but they\'d be a false indication of the temps going in - the real temp is hotter because of the heat soak from the engine and therefore a more realistic temperature. Hence, i wanted to see realistic temps.
Jonathon_F or something is selling them for £20 a piece.
Im getting confused now. (stop laughing - it happens all the time to me! :o )
Why change the sensor if it\'s not going to give accurate readings?
There was also a chap who installed the sensor in the stock position and the OE one in the elbow?
Sorry - have i given the wrong impression. I shall try and be more clear. The replacement sensor gives as accurate readings as OE as far as i can tell. It just reacts quicker to the change in temps. Now, i some people are suggesting that it may be better to put the sensor in the inlet elbow as it will see cooler temps, but i think that will be false indication of the actual inlet temps as by the time the air has gone through the upper inlet manifold, it will have heated up due to the heat soak within the UIM from the engine. I would prefer to see the accurate temps, and therefore prefer to keep any air temp sensor i have in the upper inlet manifold.
Hope that makes a bit more sense now?
Ah gotchya - top stuff, thank you fella! :cheers
I can see where you\'re coming from, however I\'d be worried about the temp sensor itself becoming heat-soaked. Having not seen one in the flesh I can\'t really comment, how is the body of the sensor insulated from the metal of the UIM? Also, with the length of time the air actually spends in the inlet manifold I can\'t see it making a huge differnce to its temperature. Ideally someone needs to do a back to back comparison of the two locations.
Quote from: MillSpeedI can see where you\'re coming from, however I\'d be worried about the temp sensor itself becoming heat-soaked. Having not seen one in the flesh I can\'t really comment, how is the body of the sensor insulated from the metal of the UIM? Also, with the length of time the air actually spends in the inlet manifold I can\'t see it making a huge differnce to its temperature. Ideally someone needs to do a back to back comparison of the two locations.
And i am working on that...:driving
The heat soak into the UIM is gonna heat the air up. In my opinion, it is that simple. But if a good scientific test is proven, then we shall see. The trouble is getting a good scientific test
One thing is clear, these faster sensors will be providing a more accurate reading to the ECU over stock, regardless of the position.
If you move the sensor somewhere else which means you get a more accurate reading of the temperature of the air, you will then have to remap your car as the ECU will assume that the air is actually cooler than it was when it was mapped.
Erm..that may not read right. It assumes that you get heat soak when tuning which may not be true as the bonnet is open...
Anyway, where can I buy one?
think mine is playing up so i am curious about this???
can anyone explain?
This is my thoughts:
Basicaly the ECU takes a reading of the air temp in the inlet track to get the fuel mixture correct for the temps the engine is recieving...... in my opinion the perfect place to have the sensor would be as close to the injectors as possible, as the A/F mixture will be exactly correct at the point of the injectors!! If it warms up or cools down between the injectors & combustion it won\'t aulter the A/F mix!!
Thats my thoughts, so I would be inclined on moving the sensor the opasit way to what people have been doing & place it on the outer edge of the manifod so it is away from any prone hot spots within the engine bay and as close to the injectors as possible!!!
Does this make sence??
Jono