So on a cold engine (>12 hours to cool off), do the HX and IAT sensors read about the same (within 2 degrees) with the engine off?

Your results make sense really...the HX isnt the bottle neck, the intercooler under the blower is.

 

Yes pretty much. I am about togo shopping lots of stop and go, start and stop i will be interested in seeing how it does with that

 

So interesting results.

Roughly 82* ambient temps


First startup, completely cold
Intake temp 80*
Iat 82
Hx temp 82


Cruising basically the same as startup but when stopes HX temps start to rise maybe 5* tops depends on how long stopped but they start to rise almost instantly.

Drove 20min at 60mph the. Stopped and turned off teuck for roughly 20min

Restart
Intake temp 102
Iat 114
Hx temp 92

Hx temps did not start to come down until i was cruising at least 45-50mph. They slowly decreased but once i was at cruising speed they came down really quick.




Now i am wondering if a cowl hood would help cool down the IATs even more since air would be blowing directly on the supercharger case.

 

I have been considering a cowl hood for a while to help with under hood temps. I think this would surely help.

I wish there was a heat extractor setup that I liked. I would put one on each side of the hood. Not really a fan of any of them so far.

 

My fender had a fight with a 6in hole saw and lost...much cooler engine bay though

 

right....

 

I got a crazy story about a cowl style hood. In high school I had a 1989 Pontiac Formula 350 firebird. Small mods, only a chip, airfoil, cat back and a k&n filter. The car was awesome and ran 14.0's...and I thought I was blazing a trail. Anyway, those cars have a weird looking hood with a bulge on one side. At the back of that bulge, there was a plate that is bolted on stock that keeps the thing totally sealed up. One day, just out of curiosity, I decided to take the plate off and let the engine bay breath through it. Normally the car would run anywhere from 220* to 230* according to the factory gauge. After removing the plate, the temp gauge typically stayed 180* to 190*........and almost never hit 200* unless I was just sitting still in Houston traffic.

To be honest, I wasn't expecting that much change, but it was there. I put the plate back on and bam temps came back up. Took the plate off and threw it in the trash can.

 

So what your telling me is that a cowl good would make a HUGE improvement for my under good temps. I would have thrown away the plate too. I am personally surprised my back paint on my hood has burned off yet, and I have titanium wrapped everything! And all my hot pipes are ceramic coating inside and out on top of the wrap.

Good info!

 

It was "HUGE" on that pontiac. I'm pretty sure every vehicle is gonna respond a little differently. My truck for example probably wouldn't see a gain like that as it is very "roomy" under the hood.

 

Too bad you can't spacer the rear of the hood up on these trucks without it looking dumb. (maybe you can't even do it regardless). But on many cars it's to easy to remove the rear weather stripping and space the hood up 1/4in with washers on the hood hinge to create a spot for hot air to escape.