Can someone explain to me why an air intake temp sensor is required for speed density tuning?

On my talon one wasnt installed and the car ran fine. I finally put one on after I noticed that it didnt have it...

Thanks.

 

You dont need it....but if you want the car to run in all types of wheater and keep it safe you do.

If you dont have one the EMS goes to a fail safe that you can set i believe it about 77 for the factory. It will run but when the weather changes it might not.

 

It is required, without it the EMS has no idea what the air density is and can't accurately fuel the engine.

 

The intake air temp sensor is needed so that the computer can determine the density of the air reaching the engine. In order to calculate the density of air the computer must know the air pressure and temperature.

 

the ait will allow the ecu to perform finer tweaks, due to air temp if the cal file is set u pfor it.

so if you jsut added a ait & didnt tweak your ignbias for air temp or fueling bias for air temp, for example, you wont see any difference.

for the most part, if the cal file is good, you'll be ok, but it is nice to know that on a super cold night, you can have your fooling correct for a full throttle run without being lean, if your not in closed loop fueling.

 

use the stock one after you convert to map.

i mean, stock maf sensor has it built in.

 

Thats a bad idea if you plan on running higher boost levels with an upgraded turbo as the stock MAF honeycomb tends to come apart and get sucked into the compressor. If you spend the money on a EMS why not spend the hunderd dollars (give or take a few $) on the right sensor?

 

The bad thing about the using the MAF temp is that it is measured before the turbo, so it doesnt give you the "true" temp of the air as it reaches the engine. The AEM IAT sensor is only $49.50 plus shipping, you might as well buy it as well so that you can use the AEM to its full ability.

 

i'm lazy. I have my ait sitting in my living room.

ha.

I haven't heard a case where a MAF honeycomb came off like it was meantioned above.. I mean, on cars with 500whp and below that is.

I'm just giving people a quick fixer upper before you stick your ait on the UICP.

 

That's bull****, you guys really have no clue about this stuff. The sensor is REQUIRED to determine air density.

 

What happens when air density is not read?

For instance I had a 1g with no AIT for a year and it made 458whp reliably...

 

You can't get accurate fueling without it.

 

Actually I will side with WOT more than Ackerson on this. If the map is close you will be fine in most cases. As a matter of fact in most weather conditions it's hardly used. I am not going to waste much time explaining it.

Here is the BIGGEST problem NOT running it. IF you tune the car in 80 degree weather and then run it in 30 degree weather and you do not use the air intake temp sensor to add more fuel when it is colder there is a VERY good chance you are going to hurt some parts. I use it in "extreme" cold and "extreme" hot to compensate. If you live on the equator, don't put one in.

 

That would work great if air temps were a constant, but they're not. Air temps can vary by 30-40 degrees at the TB in some setups. That's a drastic enough change to cause incorrect fueling.

I wasn't aware that the Air Temp correction table wasn't setup by AEM in the basemap when I first tuned my car. I later discovered that it wasn't setup, so I set it following the ideal gas law. A/F ratio went from being pretty inconsistent at WOT to rock steady.

I know a properly setup turbo system won't have much of a change in temperature if the turbo is kept in it's efficiency range, but I'm sure we've all pushed our turbo's farther then we should have on the stock intercooler.

Here's some reading for you guys
http://forum.aempower.com/forum/inde...c,14905.0.html

 

Thanks David for all those haters saying that you NEED it(ACKERSON & BROBARDS). I run it, yes it is nessary if you want the car to be safe, and run well in all conditions, but not nessary.