GEMS - General Engine Management Systems Ltd - Forum

Hi,

After I bought the mapping dongle and installed GW4 I noticed that Air Temp read a constant -29 degrees celcius (or something like that). Might be a sensor is not working or maybe it was never connected in the first place? The car was initially mapped by a tuner a few years ago.

I use map only, and the ecu is version 2.59.

But my question is this:
Does it matter much with the temp sensor? I read on the internet that a lot of tuners dont connect the AIT at all because the effects of the small temperatur differences in the compressed air is ignorable?
Is this true or should I be worried?

Thanks in advance for any advice!

I read this about supra's and their ait's, look at the next to last post, the one by user "Veta":
http://www.supraforums.com/forum/archiv ... 40579.html

Forgot to say that the car is a 2001 Subaru Impreza with a built 2,5 turbo engine.

Does anyone know if it is common to ignore the air temp signal?

Anyone?

I wouldn't have thought it was a good idea not to read an air temp sensor and correct the maps for it, on any turbo engine. I certainly use one on my three turbo engines. Efficiency will improve, plus they give a nice safety net if the map adds fuel and reduces boost over say 60 degrees air temp. I would get it working.

(Apologies for the delay in replying)

Agreed. AIT temp doesn't just vary with the ambient outside temperature. You have under bonnet temperature to contend with also which can vary again with 'heatsoak' following some lively driving or dyno sessions with insufficient cooling.

It sounds possible that it has been disconnected as I think that -29 is 'out of range'. It's certainly worth checking to see if this is the case.
RickS

Ok, thanks! Sounds like good advice.

I will have to look at it then