I've noticed that when I'm playing around on the highway in excess of 115mph my IAT's skyrocket...I've seen as high as 140* @ 160mph before I shut it down. Out here in the FL weather, I know my temps are going to be higher than you guys up north but its actually cooler down here right now and the temps still climb noticeably (and alarmingly) higher than I think they should be. Temps immediately return back to normal when I back off to sane cruising speeds.

I'm using the stock IAT sensor in the stock location. Anyone else notice anything like this? Heat soak coming from the intake manifold? I'm confused as to why IAT's would go up if more air is traveling over the intercooler at those speeds.

 

At those speeds, I have no clue because I've actually never driven 160mph. However, when I'm all heat soaked during the summer months in traffic (say 95 to 100 degree ambient temp), I've seen IAT's over 200 degrees.

I think IAT's should really drop with speed because of the better air flow to both the intercooler and intake. But 140 degrees doesn't sound bad given where you live and how much boost you must be running to get to 160mph on a regular basis (the more you compress air, the closer the molecules or air are to each other, the more friction between them, the hotter your intake charge will be). Is that about 50 degrees higher than ambient on this particular day? That's pretty normal but I would take a look at the location of your intake. It sounds like you might be sucking in a bunch of stagnant air in the engine bay.

 

If you are building heat on a highway pull something in the turbo system has lost efficiency, either the turbo itself, intercooler, etc.?? For example, making 500whp out of an intercooler that's rated for 350. Or pushing a turbo beyond it's limits.

If all is working well together, your IAT's should drop during a pull.

 

I was told by my tuner that while under load and moving, 120 to 140 is pretty normal for a boosted car. Its when you reach about 180 to 200, you should consider shutting it down and let engine cool down a bit.

 

Then I definitely got a problem. Where should I start troubleshooting?

On the top end I'm holding 13-14psi which is what I'm tuned for.

 

D:

You have a non vented hood with an intake behind your radiator next to a turbo - I think it just might get a little f'n hot in there at three digits! Pull an "outside" source of air for your intake...

J

 

How much power are you making? Whats your setup? Turbo size, intercooler, etc.???

Sounds to me like your intercooler isn't efficient. Regardless of the temp, it should drop during a pull, it shouldn't go up. IF the setup is "right" and efficient.


I use a stock IAT sensor, in the stock location, and my IAT's go down during a pull, and I'm pushing my car VERY HARD!!!!!

 

Mase kit: https://www.s2ki.com/forums/index.ph...f=142&t=732015

Intercooler is a Precision 600, I don't think that's the issue. I'm leaning towards Elroy's suggestion of the intake location. I've already melted a filter where it is right now.

Plan on venting the hood either this week or next among a few other upgrades.

 

Sounds like something in your setup is out of its efficiency range. Could be a badly placed intake, an over spun turbocharger, a improperly designed/sized intercooler, or some part of your aero package that is preventing proper cooling. How does your coolant temps look during all of this? Have you logged them in relation to your IAT's?

Since i relocated my air filter into the fender, my air temps dropped 20-30 degrees compared to when the filter was located inside the engine bay. An interesting fact i just learned from being N/A for the past few weeks is that my intake system really worked! i just threw a filter arm onto my TB while im N/A, and the IAT's both at stopped and moving speeds have increased about 40 degrees compared to how they were with my cold air intake with the turbo.

 

You've melted a filter!?!?!? Yeah, I would say that's a good sign that you might have an issue with intake location. Fab something fun up into the wheel well and post up the results.