cooling fan manual switch

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Dec 9, 2011 | 12:22 PM

#21

383vett

Race Director

Joined: Apr 2003

Posts: 17,700

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From: moraga ca

For my strip only car, I have an adjustable fan control set to turn on at 195. I also have a manual fan switch on the console that I turn on before a run to get the temperatures to 160-170. After the burnout, I will turn the manual fan swith off. During the run, the fan is not running which helps decrease drag by the alternator. I know it's not much, but in bracket racing, we're looking for every hundreth and for consistancy.

Dec 9, 2011 | 09:04 PM

#22

pcolt94

Le Mans Master

Joined: Jan 2006

Posts: 5,621

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From: Orlando FL

Quote:

Originally Posted by 383vett

For my strip only car, I have an adjustable fan control set to turn on at 195. I also have a manual fan switch on the console that I turn on before a run to get the temperatures to 160-170. After the burnout, I will turn the manual fan swith off. During the run, the fan is not running which helps decrease drag by the alternator. I know it's not much, but in bracket racing, we're looking for every hundreth and for consistancy.

How do you ever get the temp down to those numbers. Even if it is 50* outside. I can run my secondary fan all day and never get below 190*

Do you have an over size radiator? (and maybe a 160 stat??).

Dec 10, 2011 | 10:35 AM

#23

leesvet

Safety Car

Joined: Apr 2011

Posts: 3,660

Likes: 22

Quote:

Originally Posted by 383vett

Very true !

hard to believe, but true. I saw the estimated cost in HP for each pulley on a C4....3 for water pump. 5 for alt, 7 for a/c compressor, 5 for power steering. (IIRC...)

If you doubt, bottom out your power window at idle and watch the tach and listen...you can hear the engine bog slightly as the alt reacts to the power window motors demand for amps as the motor can't turn anymore.

Regarding the temps...
Mines an enhanced motor with rad upgrades and tune control of fans.....If I put the 160 stat in there it will run at 169 all day on the freeway if ambients are under 85. I have to run a 180-190 T-stat to keep the temps up enough for stable tuning and performance and so its gets hot enough to rid itself of internal moisture.

Last edited by leesvet; Dec 10, 2011 at 10:38 AM.

Dec 10, 2011 | 01:14 PM

#24

383vett

Race Director

Joined: Apr 2003

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Likes: 1,667

From: moraga ca

Quote:

Originally Posted by pcolt94

160 degree thermostat, Ron Davis radiator, Meziere electric water pump. I can get the motor down to freezing on a cold day.

Dec 10, 2011 | 01:54 PM

#25

leesvet

Safety Car

Joined: Apr 2011

Posts: 3,660

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I LIKE being able to control the operating temps instead of the temps controlling me !

Dec 11, 2011 | 05:37 AM

#26

RichS

Le Mans Master

Joined: Aug 1999

Posts: 7,339

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From: WilkesBarre PA

For the track I wired in 2 relays into a adjustable timing circuit in the 96GS. I have both fans turn on low speed and run the elect water pump. I have the timer set for 7 min (adj 0-30min) and it cools the car off very well. In cooler outside temps it will drop way down from 180 to 130. I used a timer so I don't forget about it and kill the battery.

On the OBD2 cars sometimes you will get a SVC light on but not a check engine if your controlling the fans and the computer tries to turn them on when the car is running. No biggie just restart the car normally and it goes away.

Dec 11, 2011 | 01:03 PM

#27

383vett

Race Director

Joined: Apr 2003

Posts: 17,700

Likes: 1,667

From: moraga ca

Good idea. I've seen more than a couple of cars with dead batteries in the staging lanes because the water pump and fan were left on for 45 minutes or so.

Aug 29, 2019 | 03:26 PM

#28

Rich Gene Everett

Cruising

Joined: Jul 2017

Posts: 13

Likes: 0

post #8 manual switch idea!

I really like the idea of post #8. Is that same install intstructions for a 94? Its not specific saying 94 will work or not.

I want to manual switch for high speed fan only for my 94, can someone help please? I need pics, how too, instructions, ect. Please help!

please reply to my email!

pumasixtynine@gmail.com