I have no way to test my IAT2s.

Has anyone tested stock IAT2s or with aftermarket IAT2s?

I would really like to know if the car is getting really hot intake temps on a hot day.

I would think with my huge intercooler that it wouldn't get much above ambient.

But we know what assumptions do.

 

i have dual aeroforces. my intake temp is 5 degrees under the ambient temp when driving. sitting i gets above 100 degrees sometimes depends on the ambient temp. i have the stock IC. no tune.

 

You are talking about IAT1 right, I want IAT after intercooler, (I.E. IAT2)

I have seen IAT1s of upwards of 110 on a hot day.

 

I really wish the RPD would have shown IAT 2's .... would have been nice ... they show IAT 1's

 

I've wondered this myself. I don't have any IAT2 reading capability yet.

I can see on my RPD though that the IAT1s can get up there, despite being "cold air". I think the highest I've seen is a little below 120. Once I start moving though, it'll go to a few above ambient usually if I keep moving.

 

Yeah on these forced induction cars GM should be putting an extra sensor in there.

Would probably help them develop mroe reliable products. I mean how in the hell could they think the SS/SC was a good idea with such high IAT2s. An IAT2 sensor would have probably saved a lot of cars early on.

 

I think for those with OBDII capability, they can read IAT2s on the LNF because it's coming from the TMAP (temperature/manifold air pressure) sensor. So they've already got two data collection points at least, one at each TMAP.

 

I for sure can't read it with my DashHawk.

 

Hey, does anybody with Aeroforce gauges have the ability to read IAT2s for sure?

I was under the impression that reading IAT2s wasn't an issue. How have they been posting IAT2 temp drops during IC testing then?

Maybe it's an HPTuners thing or something.... hmm

 

This is why I posted this thread. I don't want to purchase anything as I don't have the money, but really need to know if I am hurting this car on really hot days.

 

Checked Hahn's website. They definately have IAT2s posted in HPT graphs, so there's got to be a way to read them through the bus.

 

They are seeing a 154 degree IAT2 when the IAT1 is 85 degrees on the stock IC

That seems like it is getting pretty warm to me.

Their aftermarket IC had an IAT2 of 88 degrees at 81 degrees IAT1

 

When I got tuned in 110 degree weather, IAT never got more than 10 degrees above IAT 1 on 3rd gear pulls. On cruising IAT2 was lower than IAT1. Car is otherwise stock.

 

My IAT 1 was just now 110-130 depending on if I was moving or sitting still.

The IC can't below ambient, correct?

So I'm just gonna assume the IAT2 is close to IAT1 and not worry about it.

 

.... damn GM, just make like easy for us instead of this guessing game!

 

I can read IAT2 on my Dashdaq. Usually with temps in the 80's, which is about how hot it's gotten here in Utah so far, the IC doesn't do a whole lot. The IAT1's are about ambient when you're moving. Since there is no way for the IC to reduce the temp below ambient, it's just physically impossible. Maybe once we get into the 90's or 100's the IC will make more of a difference while moving.

While not moving the IAT's go up to about 130 140 range and the IC brings them down to 90 or so. I'll try and pay more attention, or better yet do some data logging and post some more accurate data soon.

 

When I was sitting in traffic the other day my IAT1 was 140's and IAT2 was in the 90's

 

That's great.

I figure the intercooler isn't heat soaking so it should be much closer to ambient.

Another thing to check is to see if the car is pulling timing on WOT runs.

If it's not, then I guess it's not a big deal.

 

So I did some more testing and found that with ambient temps near 90 the intercooler doesn't seem to do that much. IAT1's around 95 and IAT2's at about 90. Sitting idling for a few minutes at near 90 IAT1's go up to about 130-135 with IAT2's at about 110-115. So it seems like with a cold air intake an intercooler isn't going to do much at all since it can't cool the air below ambient. Is this correct? So what good is an intercooler if it really only does anything when idling in traffic?

 

I was gunna post about this , my car run's a lot stronger in the colder weather . So I was thinking a better IC would help even a stock SS/TC . Maybe not after seeing these numbers.

 

An intercooler won't do much when it doesn't have air passing through it (like when idling), just like any other kind of radiator. Once you start moving, you'll start seeing the intercooler doing it's thing better and your IAT2 come down. You'll also notice heat soak when sitting there stopped/idle, so it's possible IAT2 will go higher than IAT1.

Once you suck the hot air up into the intake, there's only so much hot air still in the engine compartment and the IAT1 will come down, but that intercooler's been getting heated up like an oven that whole time and needs the air passing through its fins to cool it (as will the intake air initially too). Eventually IAT2 will be less than IAT1 once you've been moving for a while.

You are correct, an intercooler cannot cool the intake air cooler than the outside air passing through the fins. Some use methods of getting around this limitation, such as cooling the intercooler (with compressed CO2 or something). When that is the case, then the air can be cooler than the outside air because you're cooling the intercooler below the temperature of the outside air.

 

So you're upset because the stock i/c cools the air down all the way back to ambient after being compressed?

 

No one is upset around here.

Just trying to get a general idea of IAT2s so we don't kill the engine like LSJ guys do.

 

Makes sense. Thanks And actually I have seen IAT2's 5 degrees or so above IAT1's. Now I know why. Thanks again.

No one is upset at all. Would you like to explain further? I think what you're getting at is when the air enters the intercooler it has already been compressed by the turbo and hence is a lot warmer than when the air enters the intake. I didn't even think about that until now. So the intercooler is actually doing a lot more than I originally thought. Too bad there's not a sensor to measure the temp right after the turbo.

 

Interceptors can read IAT1 and IAT2. With the stocker, I was seeing between ambient and +10 ambient when cruising, higher (could get much higher) when under load+boost.

With Hahns intercooler, I generally see ambient + 10 degrees, which doesn't change under load. I rarely see over 20 over ambient with that intercooler unless Im not moving.