Intercooler Design and AITs on circuit track

I saw the recent HPA video about bar/plate vs. tube/fin intercoolers and was wondering what are normal air intake temps for a turbo car (like an Evo) relative to ambient temps? I have a 4" bar/plate Garrett IC on my car and AITs hover 20-30 degrees over ambient temp at around 22 peak PSI of boost. AITs in the the first hot lap are closer to ambient , but AITs never recover to that initial level. Once the car is going 120+ mph, AITs start falling even at full throttle.

Do these numbers sound typical? Would I be likely to see closer to ambient AITs with a tube/fin? For sure it'd be lighter on the nose of the car.

I know that tube/fin is generally recommended for circuit cars, but I'm looking for opinions on my actual AIT numbers.

Thanks!

Hey man!

I recognize some of your symptoms when the IATs never or very slowly recover. the problem in my case was poor ventilation and heat soak.

the air couldn't exit properly, when the flow aint enough through the bay, the IC wont work or very poorly.

The IC also picks up lots of heat from the radiator when the airflow cant remove it in an acceptable rate.

The air always choose the most easy way to flow and if the resistance to flow through the bay the cooling effect will suffer.

The whole engine room will also heating up and work as a battery full of heat you cant get rid of it unless you seriously speed up.

I removed the hood, that changed everything, the improvement was enormous even the

most of the air started to flow around the car instead of going through the IC,

that was of course just a test and the solution was a pair of hood louvers.

at the back of the hood.. not too near the front window, you have a pressure zone there. and not too centered,

some of the heat and the engine smell will go straight inside the car.

Drive and quickly stop and jump out to check how hot your hood are.. you shouldn't feel much heat if the air vent works.

Check that first before you start to replace parts. that solved all my problems

/K