When should my fans start?
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Joined: Feb 2001
Posts: 236
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From: ICELAND
Car: 86 T/A
Engine: ZZ383
Transmission: TH700R4 Raptor
Axle/Gears: 2,7x -> 3.00 or 3.50
When should my fans start?
I have a ZZ383 with 180 F thermostat. I have dual fans from Dodge Stratus and an aftermarket switch ( http://www.summitracing.com/parts/FLX-31165/ )that turn both fans on at the same time, slow at first but full after 10 degrees.
"They set fan speed from 60 to 100 percent, depending on the built-in thermostat's setting. The thermostats have a range of 160-220 degrees F."
Right now its adjusted to the lowest setting, 160 F.
So that brings me to the original question, when should I let the fans start (180 F like the thermostat?)?
"They set fan speed from 60 to 100 percent, depending on the built-in thermostat's setting. The thermostats have a range of 160-220 degrees F."
Right now its adjusted to the lowest setting, 160 F.
So that brings me to the original question, when should I let the fans start (180 F like the thermostat?)?
Senior Member
Joined: Mar 2009
Posts: 505
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From: 47798 Germany
Car: '89 RS camaro 305 TBI
Engine: LO3
Transmission: 700R4
Axle/Gears: yep, has those too (stock)
Re: When should my fans start?
There are not many reasons to have the fans start before the thermostat opens and warm water enters the radiator.
Having the fans start at 180, switch off at 160 should be fine.
If the switch allows 2 different setups, maybe wire one to the A/C if available plus 210 on, 195 off, and the other one set at 185 on /170 off.
That's about 20 degrees lower then the stock setup for dual fan cars.
You could also stick with the sock setup.
Stock is something like 195 on and 234 on or somewhere along those lines. Not sure when the original fans go off again. I know they switch off when switching off the car. Some fan switches allow the fans to spin untill the set temperature is reached however
Having the fans start at 180, switch off at 160 should be fine.
If the switch allows 2 different setups, maybe wire one to the A/C if available plus 210 on, 195 off, and the other one set at 185 on /170 off.
That's about 20 degrees lower then the stock setup for dual fan cars.
You could also stick with the sock setup.
Stock is something like 195 on and 234 on or somewhere along those lines. Not sure when the original fans go off again. I know they switch off when switching off the car. Some fan switches allow the fans to spin untill the set temperature is reached however
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: When should my fans start?
When I aquired a BIN FIle for a 87 IROC-Z, the fan turn on was set at 220*. Thats factory setting too. I dont remember what temp the fans turn off though.
Thread Starter
Member
Joined: Feb 2001
Posts: 236
Likes: 0
From: ICELAND
Car: 86 T/A
Engine: ZZ383
Transmission: TH700R4 Raptor
Axle/Gears: 2,7x -> 3.00 or 3.50
Re: When should my fans start?
I dont want it to run that warm, its a carburated 383 with no emission check (and no ECM).
Senior Member
Joined: Mar 2009
Posts: 505
Likes: 0
From: 47798 Germany
Car: '89 RS camaro 305 TBI
Engine: LO3
Transmission: 700R4
Axle/Gears: yep, has those too (stock)
Re: When should my fans start?
This pretty much is your chosen operating temperature.
No reason in having the fans spin while there is no water flow through your rad, so anything under 180 as a starting temperature is not giving you a technical benefit
No reason in having the fans spin while there is no water flow through your rad, so anything under 180 as a starting temperature is not giving you a technical benefit
Last edited by the solitaire; Jul 12, 2011 at 06:10 AM.
Supreme Member
Joined: Mar 2003
Posts: 4,771
Likes: 15
From: Florida
Car: 1987 Black IROC-Z (SOLD)
Re: When should my fans start?
I have a 180 deg themostat, The Prom is et to have the left fan turn on at start up and run up to 35 mph and the right one to come on with A/C running at 220 deg. In the city my car runs between 180/200 degs with the A/C and on the highway 170/180.
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: When should my fans start?
As for the adjustable fan switch, I bought one at Autozone for $20. It has one speed but it works great.
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