I plumbed in a temp sensor into my air intake pipe so i could monitor temps.
My air filter is actually in my bumper, so not within the engine bay. It is connected by silicone pipes and metal pipes as shown in the pic. The temp probe is fitting within the metal pipe near my MAF.
So how hot does it get under there? Also take not the probe is within the metal pipe, so the heat has to soak the pipe to get hotter!
The outside temp is around 5-6c
This video was taking after sitting in traffic for about a mile @ 10mph.
I came off the roundabout and accelerated.
after parking the car for a few mins to go in the shop (5mins or so)
and after driving for 2 mins
soon i will put an air filter within the engine bay to see how much it drops by.
The actual temp after driving up to normal operating temp is a few degrees above outside ambient temp. But unless you use full throttle, the heat climbs.