Originally Posted by
tabetha
I can't comment on your specific fan, but can say even after 6 hours on the rollers which mine did regular testing this and that, that I could hold my hand within 5-6" of the turbo, without discomfort, that's with a regulated 18C, temp we normally use.
I've tested the temps on various points in the engine bay over a 6 month period, it was as simple as moving the temp sensor, with it's built in 9v battery, to get a reading.
I actually did this to prove a point to a mate, who is a airflow designer/engineer(cars, parts, motorsport), as he said it was a cool area behind headlight, I had to eat my words ha ha.
It may be they were using a smaller fan, that's normally reserved for n/a cars etc with no i/coolers.
There was a car on the rollers that had the filter at the rear of the car(pug205), but so was the turbo at the rear, didn't have heat issues!!
Fair enough, probably different ways we test cars. if it was an accel run then It probably wouldnt get as hot, whereas any cars i've done it with have been held for 5 seconds every 500rpm, and then 5 seconds flat out so exhaust/turbo is probably a fair bit hotter than your average dyno run.
I definately couldn't hold my hand near a glowing red exhaust housing 5-6" away for any length of time.
infact, I saw a car the other day with a turbo blanket, VERY good bit of kit for keeping temps down, especially on RS turbo's to keep water temps down.