Just bought an air box for my 2003 R1.

Heres the thing..... the air temp sensor in the air box is different from the one fitted to my TTS foam air filter?

The one in the TTS air filter is a Ford item, see pic below.
The Yamaha sensor in the air box is considerably shorter and slimmer.

Will this make a diference?

Ford item..

don't know for sure but i would give tts a call the ford one may send a different signal/temp ratio than the yamaha to the magic box

Just get out your multimeter and measure the resistance of both in free air, if you get the same values then hit them with a hair dryer and measure again while hot, if stil the same values you are good to go.

Unfortunately thermistors come in all sorts of values so its unlikely they will have the same values.

If you have a megasquirt ECU you can trim in software to match either.

Regards Mark

Both measure the same at cold.

Both at same temperature (in v.hot water)... Ford 950ohm, Yamaha 1200Kohm

Suppose id best swap?

[Edited on 7/7/09 by Major Stare]

Anyone agree i need to swap ?

i would

I would not worry if you are not running forced induction.

At normal air temp they will be similar, the water temp is the main control, air temp is more refinement.

By cold do you mean iced water or is cold room temp?

Cold, room temp.


Swapped last night

I know you have done it but just to aff mine ran ok but emissions were terrible and caused it to fail the sva on a supposedly fine non Yamaha sensor but only ran emissions friendly with the original and im sure it will create different running if the emissions were so far apart.