dccontrol
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I can't think of any off the top of my head but I don't understand how that makes it a waste either.
I see fan modulation as a good thing. It lets the motor warm up properly before starting the fan, and it will slow down or spee dup to maintain a preset operating temp no matter the driving conditions or outside air temp. A relay or a switch just gives you all out or nothing and has no real temp control.
Sure, relays and switches work just fine, but to me this is just a tsep up from that.
Instructor
Joined: Jul 2007
Posts: 152
Likes: 0
$$$$$$$$$$ Above 30 MPH the fan does nada. At cruise you use 40HP or so, no heat. At idle you need air flow for A/C condensor and any auxilary coolers. So, modulation of the fans between 10-30MPH is just introducing heat lead/lag. There is enough of that already present. It's just another thing to fail/go wrong.
People that buy into unnecessary gizmos buy pet rocks too.
People that buy into unnecessary gizmos buy pet rocks too.
Instructor
Joined: Jul 2007
Posts: 152
Likes: 0
Think about two stats in series running the same heater. Total confusion.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Very good point, and someone not prepared or who doesn't read the pointers when they buy one will run into those issues. It's all about what temp thermostat is used and what the on and off temps are, and at what range you want the engine to run.
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
$$$$$$$$$$ Above 30 MPH the fan does nada. At cruise you use 40HP or so, no heat. At idle you need air flow for A/C condensor and any auxilary coolers. So, modulation of the fans between 10-30MPH is just introducing heat lead/lag. There is enough of that already present. It's just another thing to fail/go wrong.
People that buy into unnecessary gizmos buy pet rocks too.
People that buy into unnecessary gizmos buy pet rocks too.
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Instructor
Joined: Jul 2007
Posts: 152
Likes: 0
Thermostatic controls that regulate heat removal use a proportional controller to anticipate the heat load. In the dynamics of a car, this would be prohibitively expensive to do. Overshoot and undershoot would be the norm. The fans would "hunt" without more input.
An RTD to regulate a modulating circuit would approach this, but without more input, it would still hunt.
Still think I'm clueless?
An RTD to regulate a modulating circuit would approach this, but without more input, it would still hunt.
Still think I'm clueless?
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Thermostatic controls that regulate heat removal use a proportional controller to anticipate the heat load. In the dynamics of a car, this would be prohibitively expensive to do. Overshoot and undershoot would be the norm. The fans would "hunt" without more input.
An RTD to regulate a modulating circuit would approach this, but without more input, it would still hunt.
Still think I'm clueless?
An RTD to regulate a modulating circuit would approach this, but without more input, it would still hunt.
Still think I'm clueless?
Thanks for proving it!
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Instructor
Joined: Jul 2007
Posts: 152
Likes: 0
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
The original owner ordered a DCC fan controller from Delta, a guy who makes these fan controllers for large powerful fans. They are PWM controllers, meaning the fan has a varying speed based on what the controller tells it to do as opposed to being just on or off.
The builder takes a long time to build and ship them, and the website and contact information is probably temporarily down.
The original poster is concerned that it's been such a long time since the order was placed, understandably.
Then...opposing opinions come out about why he even ordered one.
Some feel have a variable speed fan is a good thing and some do not. The ones that don't agree with using them like to scoff at the guys that bought them. I have one, and as soon as my electric fan is installed I will implement the use the the controller.
This thread has just kind of turned into a pissing match because some opinionated people like their opinion better than everyone else's and must make that VERY clear.
Instructor
Joined: Jul 2007
Posts: 152
Likes: 0
If you want to use one, I could care less. The point is, just because someone makes something new, does not mean it is necessary, desirable, or required.
Tornadoes, fuel magnets, split-fires, mega-dollar oil filters, oil additives, etc. are just hype.
Tornadoes, fuel magnets, split-fires, mega-dollar oil filters, oil additives, etc. are just hype.