Thread: Why Cold Air Intakes Matter

Originally Posted by Iceman6669

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

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*.

Originally Posted by Iceman6669

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*.

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.

Originally Posted by hensleya1

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.

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.

Yeah, I believe you'd have to scale it.

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

You would have to scale the readings with a resistor or something.

Originally Posted by BillBoost37

(pictures of IAT sensor drilled into LIM)
Later on, I relocated to the end of the intake by #1 cylinder.

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

Originally Posted by sseilmnop

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

I'm listening... LOL

Originally Posted by Iceman6669

Are you running the blower S1x or the NA S1x?

I'm running a blower S1X. I think Dan's running the NA one

Originally Posted by darkhorizon

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.

The stock GTO iat did the same thing. But someone found a different sensor that takes readings much more often.

Originally Posted by hensleya1

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





I'm listening... LOL



I'm running a blower S1X. I think Dan's running the NA one

Well that right there makes quite a bit of difference.

The biggest difference is my motor having a ton of blow by

Originally Posted by GTPpower

The stock GTO iat did the same thing. But someone found a different sensor that takes readings much more often.

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)?

Originally Posted by Bio248

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)?

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