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3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
in the process of tearing the car apart and doing some maintenance work. i took off the main fan, but space is so limited between the water pump/water pipe and the radiator the i can't just slap a slimline in there. what have you guys done when deleting the stock fan? i mocked up a 9" fan i had sitting around here, and i could fit that in the upper pass side corner of the radiator, and probably fit a 12" on the driver's side.
The electric fan fits no problem...you have to get a slim one and off set it on the radiator or get 2 10" fans..i did this and it worked great took me 25-30 mins to wire it all up and it was very much so worth it...i dont know about the aux fan..i never ran AC due to the fact i removed it so i cant help there sorry
the fan i was using for mock up purposes is only 2.5" thick, so it is quite slim. i will most likely stick with a 9" and 12", with the brand i'm going with that will be 1750 cfm total.
Originally posted by draculia@Sep 5 2004, 04:26 AM the fan i was using for mock up purposes is only 2.5" thick, so it is quite slim. i will most likely stick with a 9" and 12", with the brand i'm going with that will be 1750 cfm total.
btw, metal rules
AWWWWW YEEEAH lol we need more metal fans BTW go permacool if you want a large fan...my friend has a 2150 CFM permacool on his E30.... you will love the added engine spool and sound without the Clutch Fan
summitracing.com has a lot of electric fans...i went dual 10" permacools combined to make 2450 CFM's and i had them both on switches...im weird i preffer it that way...
someone explain this to me. How does an electric fan increase power? I know it takes the load off the engine by not sapping engine power to run the fan, but doesn't it just load up the alt. more making that pull harder and use more power?
Originally posted by Oxbrain@Sep 5 2004, 10:55 AM someone explain this to me. How does an electric fan increase power? I know it takes the load off the engine by not sapping engine power to run the fan, but doesn't it just load up the alt. more making that pull harder and use more power?
It doesn't increase power, it just gives back parasitic losses of the stock unit. The engine is still rated the same.
Now GM found HP when the rerouted their coolant in reverse flow. I believe it was 35 hp just from coolant flow. IE a more dense cooler intake temps equal better power less leaning out through out the rev band.
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took me 25-30 mins to wire it all up and it was very much so worth it...i dont know about the aux fan..i never ran AC due to the fact i removed it so i cant help there 
sorry
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