Let's say the intake air temp is roughly 70 degrees, which is about the temp outside, what should my IAT2's be, if i am on the highway, cruising at 70mph.

I am just wondering if they are high, low, or normal. Thanks guys.

IGNORE THE MODS IN MY SIG, don't tell me what they SHOULD BE WITH MY MODS, tell me what a NORMAL cars IAT2's would be.

Because : Meth wont be installed tell tomorrow, and the header/dp/cat is being installed tomorrow, along with the springs.

Thanks guys.

 

15-25 degrees more.

 

so if my IAT is 60, my IAT2 should be around 85? If I am cruising at 70mph on the highway.

 

in florida its usually about 90 degrees and my iat 2 while crusing are usually 110-120 degrees

 

what about when your sitting ideling? I see my IAT2 temps go up to like 120 or more sometimes. Is this normal?

 

yeah the car isnt moving!!!!!!! once you start moving it should cool back down.

 

ok cool, because the other night it was roughly 65ish out, and my iat2's were like 83 degrees and my buddy thought i must of had a heat exchanger on, or a dual pass end plate without option b, since he was doing work under my hood. He just thought they were REALLY low.

But yes, generally my iat2's are 15-20 degrees above my iat, and my iat is generally spot on with the temp outside.

Does this sound like my car is doing decent?

EDIT: chad463, when the car isn't moving obviously its going to get hotter, my iat2's have gone up to like 130s when not moving. So no worries.

 

My IAT2 are usually around 15-25 degrees above IAT, I run a Cobalt Addiction Heat exchanger filled with distilled water and water wetter. So if its say 70 Degrees outside I am usually around 85-90 IAT2...The cooling mods make a huge difference under WOT, I very rarely see over 135-140 IAT2 through a 3 gear WOT pull...I also have meth.

But ya there should be a 15-25 Degree difference between the 2 numbers

 

i'm jealous, i can never get my IAT2's below 20 degrees above ambient even when cruising on the highway. I generally see 20-30 degree above IAT1 driving at 70

 

20-30 seems about average for a stock intercooler system.

 

if it helps the discussion i have a bit of personal experience to add.

when installing my cobra H/E, i was lazy and didnt do 90* fittings at the cobra, and instead used hose benders to achieve the result.

needless to say, as time wore on, the sharp turn the hoses were making, put slight kinks in the hose.

here are some numbers that i took, before fixing the issue
(at 110km/h cruising)
50*f - 80*f iat2
60*f - 87*f iat2
72*f - 95*f iat2
(end of 1/4 mile)
60*f - 135-140* iat2

and after fixing this slight flow restriction....

60*f - 78*f iat2
70*f - 84*f iat2
(end of 1/4 mile)
65*f - 115-120 iat2

pretty significant change, for just a slight kink in the hoses...
I gained a full mph on the back half of the track after fixing this.

 

mines no where near stock....

i do need to redo some hoses though, one of the bends is slightly kinked and i have a very small leak

 

What do you have.

 

everything except meth

 

That sucks for you. I've got a 2.8 on stock intercooler system and my IAT2's are usually between 20 & 30* over IAT.

You running a really small pulley, I take it?

I've thought about dropping to a 2.6... but thoughts were all that happened.

My new car will have a 2.6" on it.

 

Interesting......I dont even have the hose benders, just alot of hose so I could make a big loop without it kinking. I might try the elbows but damn it is a bitch to bleed.

 

no he runs a 2.9"

 

...He's got a Cobra HE? Dual Pass? Why are his IAT2's so high at cruising speeds?


You know what I noticed this morning? Cruising at 40mph: if I put it in 3rd gear (2250rpm or something)... IAT2's were 87. If I put it in 4th gear (just under 2k, IIRC)... IAT2's were 91.

I've done this with multiple speeds and gears. It seems that keeping the Engine at around 2250rpm's is best.

Have you ever screwed around and seen things like that?

I'll try and get it on film sometime.

 

Usually when i screw around with things it involves my foot and the floorboard meeting lol. He also runs a upgraded pump.

 

Interesting... I assume you guys checked for kinked hoses blocked lines... checked to make sure it is flowing properly. Could it be something stupid like not flipping the Laminova's when he installed the dual pass? Or maybe he has the wrong Laminova's flipped. Nah, I think that would be a lot more noticeable.

Cars are such strange machines.

 

iat1 100 iat2 154 at the end of third run from 35-110

 

LoL. My IAT2's don't raise 20 degrees through a 3rd gear pull. Gotta love dual pass, h/e and a turbo..

If I drive for any period of time park it and go and touch the intake mani right away it's always cool to the touch.

 

i like my power better

 

yes. it has to do with the engine drawing in ambient air through the intake. if you pay attention to the boost gauge at almost any rpm, you will find your iat2 will be cooler when the gauge is reading just a little bit of vacuum (slightly below 0psi).
when you close the throttle body, you have very little air coming into your manifold, thus heat will build quickly.

 

The pump speed dictates the IAT2 temps, if there is a 'kink' or a routing issue, it doesn't work efficiently as an0malous has pointed out.
If you doubt this, log it with HPTuners and change the % for the pump. You can clearly see the change reflect on the scanner.
If ambient air worked to cool the intake charge, we wouldn't need the pump or the laminova cores to transfer heat.