Fan delay relay

[Z Ya Later]

I'm wondering if there is a way to rig up a relay to keep at least the low-speed fans on for a few minutes after the car is shut off and has reached a certain temp. I noticed the GN does it from the factory and am wondering if anyone has though of this for the F-bodies. Thanks.

[Rob B (shoebox)]

You could probably design a circuit to do what you want, but I have never seen much use in having the fans run while the engine is off. No coolant is circulating, so all you are doing is cooling what is in the radiator. If you had an electric w/p running at the same time, that might be of more use, though it would be a bit of a load on the battery.

[94 formula]

Why does the GN do it. Because of the turbo?

[Z Ya Later]

I'm not sure exactly. The turbo itself has nothing to do with the cooling system, but the intercooler would. However, since the car is off, that wouldn't play a factor either. It could be that, do to the motor, the coolant stays extra hot and the fan is meant to keep going in an effort to preserve the radiator. Can't say that I know for sure though.

[94 formula]

Not to hijack the thread but something I've always wondered. Why do SC/Turbos get hot. I could understand a turbo cause of the exhaust but especially a supercharger. I mean isn't it just spinning off a belt and pushing in more air. What causes all the heat. Or is it from the engine being given more air and gas just makes it hotter under the hood?

[bru333]

You aren't just pushing air. you are compressing air. This heats the air up!

[Z Ya Later]

Actually, you're both right. Yes, turbos and blowers push the air, but they push it at such a rate that the air is compressed. For the blowers, the speed at which they accelerate the air is what causes the heat. For a turbo, however, its not only the speed that the air is being accelerated but also the exhaust gas is being accelerated. Remember, the impeller will accelerate the intake air because it is being accelerated by the exhaust gas, thus the faster it spins the faster both the air and exhaust will be moving. Thus the reason why turbos get that cherry-red glow when under high boost.


P.S. - HIJACKERS!!! lol