One Q
just wonder any of auto cross fan or TRACK DAY guy runing the cooling system with out fan. MY engine builder told me during the hight speed the fan will just block the air?
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He's pretty much correct. The fan on a roadrace car is generally of the electric type and only used on the grid. I wouldn't take the fan off an autocross car though. You aren't moving fast enough for a sustained length of time to warrant taking it off. The electric fan on an autocross car might be best because you can still run it after you shut the engine down.
Good racing... db |
you can drain the hydrolic fan fluid so it spins freely. that helps a little
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I concur about autocross. It's a 40-90 second burst of high reving fun but when you get back to the grid, you'll want that fan running. I tend to idle my car between runs in the grid, sometimes with the hood up, to let the engine temp cool down in the Summer months.
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What!!!! somebody has lost their mind. I race Autocross every monthj and my water temp only goes to about 85-90 deg celcius. I also run circuit, road courses like Nikko, Ebisu, Tskuba and Fuji. ON the circuit the water temp is out the roof. At ebisu on Nishi course which is 2,103m long the water temp goes to 115 deg or so. I use the Stock Clutch fan and have a aftermarket thermostat.
I just purchased a 3 core radiator for this season so I can survive without overheating at Fuji. Autocross gives a very small demand on the cooling system but road racing triples it. If you are only drag racing then you could do away with the fan but anything else I would want it there. |
Originally posted by Ranzo What!!!! somebody has lost their mind. I race Autocross every monthj and my water temp only goes to about 85-90 deg celcius. I also run circuit, road courses like Nikko, Ebisu, Tskuba and Fuji. ON the circuit the water temp is out the roof. At ebisu on Nishi course which is 2,103m long the water temp goes to 115 deg or so. I use the Stock Clutch fan and have a aftermarket thermostat. I just purchased a 3 core radiator for this season so I can survive without overheating at Fuji. Autocross gives a very small demand on the cooling system but road racing triples it. If you are only drag racing then you could do away with the fan but anything else I would want it there. |
I can only offer my experience with my car here in Atlanta. Remember, in the Summer, it's HOT here.
I'm using my stock temp gauge and we all know how reliable they are. I did notice that the under-tray did help the cooling by about a needle-width. |
Well, he is right about that. Keep the under tray. There is no advantage to removing it. If helps the airflow through the engine bay. But removing the fan because it impedes airflow? Take the crack pipe away from him. Of course there is air resistance with the fan. How else can a fan move any air if there is no resistance?
Keep the fan and be happy. |
At present I do not have the under tray on my car. I do concur that it is best to have it in place for cooling. I have the closing panel on top of the area where the dryer tank for the AC. Also I have a aero bumper and not a stock bumper this will direct more air into the radiator and intercooler.
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Originally posted by Jerk_Racer Well, he is right about that. Keep the under tray. There is no advantage to removing it. If helps the airflow through the engine bay. But removing the fan because it impedes airflow? Take the crack pipe away from him. Of course there is air resistance with the fan. How else can a fan move any air if there is no resistance? Keep the fan and be happy. |
My road race RX-7 runs without a fan. I don't know that I'd auto-x without one. My temps are fine, but I dont' leave it running on Pregrid of course.
PaulC |
Yeah, I know what he's saying. Of course a fan is a slight restriction. But it really comes down to if he'll be driving a car without a fan on the streets or not. 100% track use, it'll be fine. AutoX? Then it's not a good idea. Especially if he has to drive the car to and from the events. There's a reason why those fans are there after all.
I have a Black Magic fan on my car and it's great. Even without the shroud it's much better than the stock fan setup. I use an OE thermostat as well. I haven't had it out to a lapping day yet (since it was installed over a month ago) but for autoX and around town it's great. I'm confident that it'll be just fine when I do take it out for a track day. |
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