Kevmean, this has been spoke about quite a bit. Yes that's it's main pupose, fine when your in slow moving traffic, but once the bike is travelling a bit faster, the sensor has already suffered heat soak and reads inaccurately for a while.

By fitting it here



It works much much more efficiently, I've had mine here for over a year now. Try it, there are no adverse problems, only gains to be had all round.

I would have thought that the best place to put sensor is in the airbox - that will give the most realistic reading.

Although I hesitated on doing this - how do you know that there isn't an "offset" factor coded in the ECM to compensate for the artificially high reading ...

Moved mine as soon as i got the bike home,just had to extend the wiring.When the fans come on you still see the temp rise alarmingly.Just done a warm up log on spy and you can see exactly when the fans come on.

But while I was moving the sensor I tried a very simple "trick" to see if I could richen things up a bit, I put a variable potentiometer in the circuit.Couldn't really see any change, but more interestingly I couldn't get the temp display to change.
I assumed then that there was more than one temp sensor.

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Nige...1125d 9.43@140mph

I have tried it in the airbox too, same problem with heat soak but worse, took a very long period of riding at a fast enough pace for the reading to drop again.

I remember a huge thread on badweb about it, the IAT has little if any effect on fueling, the O2 and baro are more important.

If you have a EBR ECM the fans are programmed to run at an earlier temp, so it will blow more hot air onto the stock sensor area at slow speeds, the AT readings were so far off it was annoying me hence the main reason for me starting to play with this.

Try it for yourself and come back with any bad findings you get, bet there arn't any.......

Typical IAT correction from an 1125R:


Any errors will ultimately be accounted for by the O2 sensor, unless you are in open loop... However as Avalaugh points out, there is very little difference in correction, certainly between 25 and 50 deg C, and by placing the sensor outside the airbox, and believing the measurement inside the airbox, you are erring on the conservative side and running richer...

Needless to say, there is a lot of heat absorbed by the black airbox and radiated to the sensor...

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08 Specialized Langster

So I may as well move it away from the air intake and stick it somewhere that will tell me if I'm going to get cold or not ...

Pretty much, that was my goal and it worked, now my ambient temp reads more accurately and I can see the sort of intake temps the engine is getting when on the move.

My turn for a faulty IAT - my 1125R was showing 66 degrees C this morning from cold !

Looks like it's new sensor time ...

From reading this thread it sounds as if the IAT sensor does not have much effect on the running of the engine - but I had the opportunity to "open her up" on my commute home from work this evening, and the motor is bogging down when the throttle is cracked open, didn't do it last week before the problem manifested itself. So this needs to be sorted, does anybody know if this is a generic HDB part, or is it Buell specific - if it's generic then I may be able to locate one quicker.

I think it is the same sensor as on the XBs, P0138.K.

This looks the same though...

Just in case the link stops working, it fits:

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08 Specialized Langster

Any news?

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08 Specialized Langster

Cleaned up the sensor and tested out OK, but could not get it back into position as my hands got too cold. I will put it back on Saturday. The problem could have had something to do with the amount of rain we've had lately.

A new one isn't expensive so I will get one ordered up anyway.

Wanted to use the bike on Saturday to give it a good test run, but unfortunately I'm on call so cannot go far.

Miserable Bs, nobody wants to swap !