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less I know,more I learn
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can you run cooling fans without resistors
Can the cooling fans handle being used without the speed resistors
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10-20-2014, 04:10 PM
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Registered User
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Yes, but only at full speed. I don't have the resistors, so I'm not sure what (if any) rewiring might be required to make that work properly.
This said, my fans are the late fans and they run directly off battery voltage via servos hooked to my water pump controller. The resistors aren't necessary.
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1987 Guards Red 924S 1986 White Toyota MR2 |
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10-20-2014, 04:22 PM
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less I know,more I learn
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Thanks for the help. I'm going to shorten the wires that go to the resistors & join them.(no resistors)I'm not gonna use the temp switch on the rad. I'm going to use the temp switch wires with toggle switches to turn on manually. So the relay will still be used. Does that sound ok.
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10-20-2014, 05:48 PM
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less I know,more I learn
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I'm going to use a light weight race battery & I don't want the fans running after the engine is off. I would also like to control both fans manually. Cheers
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10-20-2014, 06:05 PM
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Going faster all the time
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Sounds good... the PO of my 951 had a switch hooked up to do that. The PO of my 944 has them set up to run all the time. Loud, but effective.
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Now: 1997 German-built Boxster - Black Then: (2) 1973 914 2.0 Marathon Blue | 1986 944T Alpine White | 2004 40th AE 911(996) #898 | 1987 944 Guards Red | 1976 914 2.0 Summer Yellow | 1974 914 2.0 Light Ivory | 1986 944T Black | 2006 Cayenne Turbo S - Titanium Gray |
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10-20-2014, 06:43 PM
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less I know,more I learn
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Right on,loud is good . Nothing like driving through a tunnel at 6500rpm with an electric exhaust dump opened up. I can't wait. Thanks a lot guys . appreciate it
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10-20-2014, 07:13 PM
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Registered User
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All sounds good. Technically speaking, you don't need the relays if you have sufficiently sized switches. I'd probably still go with the relays simply to keep the load lines short.
Regardless of which you go for, don't neglect the fuses. 16 amps for the early (3 blade) fans, 25 for the late (6 blade) fans.
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1987 Guards Red 924S 1986 White Toyota MR2 |
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10-21-2014, 07:02 AM
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plays with toy cars
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FWIW, the 3 blade fan only pulled about 6-7 amps @ 12v when I had it on a voltage supply. I had cut the blades off and was using it for an unrelated project...
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1983 944 - modded everything http://forums.pelicanparts.com/dto_garage.php?do=viewvehicle&vehicle_id=28317 '86 951 - under construction http://forums.pelicanparts.com/dto_garage.php?do=viewvehicle&vehicle_id=28374 |
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10-21-2014, 07:52 AM
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Including startup? The 6 blade fans don't consistently pull 16 even on startup (as evidenced by the fact that I briefly ran them on 16 amp fuses), but they'll definitely blow 16 amp fuses on startup.
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1987 Guards Red 924S 1986 White Toyota MR2 |
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10-21-2014, 07:56 AM
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less I know,more I learn
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Thanks,I'm going to use the relay as I'm using the original wires that turn on the fans(6 blade)& wire them up to switches. The original wires from the temp switch on rad.
Last edited by Backyardbodyman; 10-21-2014 at 09:39 AM.. |
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10-21-2014, 08:33 AM
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86 Porsche 944 NA
1976 Mercedes 300 D
1984 Chevy 3/4 Ton Truck
1986 Porsche 951
Claudia
Heidi the NA
