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Why Cold Air Intakes Matter

IAT in the LIM is quite common over here in Aus... especially on a2a intercooled setups.
Its usually around 85 degrees C when they start to not like timing anymore.
 


Iceman6669 said:


Even on a stock tune, unless your IATs hit 122* it wont pull any timing.
Click to expand...

To be exact you guys pull timing at 104 degrees but only by 1 degree max timing being pulled all the way up to 176degree iat temp is only 2degrees.

Looks like if you do mount your iat else where in the lim you can easily setup this table to be more aggressive based on hotter outlet temps. Even with cold air intakes if the supercharger becomes heat soaked you're screwed until it has a moment to cool back down. That's just the nature of roots superchargers.
 
LOL. I just looked at the other BIN files i have. I was looking at the 97 bin I guess. LOL. 97s dont pull timing till 122*.
 
Iceman6669 said:
LOL. I just looked at the other BIN files i have. I was looking at the 97 bin I guess. LOL. 97s dont pull timing till 122*.
Click to expand...

I'll reply more fully to everyone tomorrow but this one sticks out at me. If timing isn't pulled until 104 or 122* IAT - and that IAT is measured right behind the air filter - what is the "true" IAT post-blower? I dare say it's a whole lot higher.

A IAT sensor inside the LIM would allow for a more adaptive tune that could compensate for (1) the varying air intake temps which may be lowered by a CAI, (2) the heat added by the blower, and (3) any cooling effect that an intercooler has. Obviously when the latter heat soaks and IAT rises, the timing could naturally be yanked to prevent KR.
 
hensleya1 said:
I'll reply more fully to everyone tomorrow but this one sticks out at me. If timing isn't pulled until 104 or 122* IAT - and that IAT is measured right behind the air filter - what is the "true" IAT post-blower? I dare say it's a whole lot higher.

A IAT sensor inside the LIM would allow for a more adaptive tune that could compensate for (1) the varying air intake temps which may be lowered by a CAI, (2) the heat added by the blower, and (3) any cooling effect that an intercooler has. Obviously when the latter heat soaks and IAT rises, the timing could naturally be yanked to prevent KR.
Click to expand...

To build on this, I wouldn't imagine that this would be difficult to do tuning-wise. You would just have to graph KR vs IAT (with your IAT post-blower) during a scan, and then just put negative numbers in the IAT adder table to prevent the knock.
 
Someone take a screen shot of the IAT comp.

Last I checked, (2+ years ago) it won't work for post blower temps unless you're running an intercooler.
 


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Maybe another tuner you can but you cant edit the axis temps, Youd have to figure it out or just blindly interpolate the right numbers in till you got the desired effect
 

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Real dumb "data" provided in that post too.

The iat sensor is the slowest depry sensor ever created. Its flat out designed to fudge the temps over time and the 10 seconds you are ripping (stagnant) air on a dyno isnt going to instantly drop the temps as measured by that slow as molasses sensor.
 
BillBoost37 said:
(pictures of IAT sensor drilled into LIM)
Later on, I relocated to the end of the intake by #1 cylinder.
Click to expand...

Bill, do you have a part number for the IAT sensor, wire you used (or a write up on both would be ideal?)



sseilmnop said:
I have about $60 into my cold air intake.
I have a phenolic intercooler that is cheaper than ZZP's aluminum one.
My intake air temperature are 20 above ambient. My heat soak temperature is way lower then most. What does it all mean????? I believe I will be faster run after run at the drag strip.
You should see my IAT
Click to expand...

I'm listening... LOL


Iceman6669 said:
Are you running the blower S1x or the NA S1x?
Click to expand...
I'm running a blower S1X. I think Dan's running the NA one
 


darkhorizon said:
Real dumb "data" provided in that post too.

The iat sensor is the slowest depry sensor ever created. Its flat out designed to fudge the temps over time and the 10 seconds you are ripping (stagnant) air on a dyno isnt going to instantly drop the temps as measured by that slow as molasses sensor.
Click to expand...

The stock GTO iat did the same thing. But someone found a different sensor that takes readings much more often.
 
GTPpower said:
The stock GTO iat did the same thing. But someone found a different sensor that takes readings much more often.
Click to expand...

was there not someone modifying the stock ones at one point for faster refresh rates? i could have sworn i had one on my car.

was it brian (reptile)?
 
Bio248 said:
was there not someone modifying the stock ones at one point for faster refresh rates? i could have sworn i had one on my car.

was it brian (reptile)?
Click to expand...
It's possible. I haven't heard of anyone doing that on this platform though.
 


I figured the IAT sensor was slow, always wondered why the temps would barely change even under sustained WOT conditions with a fenderwell intake.
 
The newer card mafs have a really good iat even though it's integrated but since there cheap anyway 30-40 bucks. Yale could hack them up and use those iats
 
Iat is a real worthless value in a car running 100% on hotwire maf.

Updating that value faster is dumb when you can just ignore it completely.
 
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