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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838410
05/02/11 11:37 PM
05/02/11 11:37 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
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I got the fan installed in my truck over the weekend, and just got the rough prototype installed and tested. Now I wonder if I have an unrelated cooling issue. In 45* weather, even at full speed, the fan isn't really cooling it down much  The engine is a tired 318 with a two year old 3 row radiator. I think my 195* thermostat is actually a 205*, and I have no idea how old the water pump is. Other than that, it does seem to vary the speed accordingly, and at highway speeds the fan was slowing down automagically. I guess now I just need to get the real prototype tested a little more, then send one to Andy to test in some warmer weather. 
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838411
05/04/11 04:51 PM
05/04/11 04:51 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
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I increased the sampling rate from every 2 seconds to every 6 seconds this morning, and it seems to have made a big help (duh). It's not hitting full speed near as often now  I still wouldn't be surprised if my cooling system isn't up to snuff, as it seems to take a long time for the temps to come back down. Progress!
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838413
05/04/11 10:12 PM
05/04/11 10:12 PM
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Joined: Feb 2003
Posts: 8,692
Andrewh
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Quote:
I increased the sampling rate from every 2 seconds to every 6 seconds this morning, and it seems to have made a big help (duh). It's not hitting full speed near as often now
I still wouldn't be surprised if my cooling system isn't up to snuff, as it seems to take a long time for the temps to come back down.
Progress!
yeah, have to say you need to go through your cooling system.
if it runs for more than a couple min at 100 degrees out, something is wrong.
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Re: Mercedes fan upgrade
[Re: Andrewh]
#838416
05/05/11 12:37 AM
05/05/11 12:37 AM
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Posts: 3,903
Oregon
hooziewhatsit
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I need to test turning the fan off at apeed to see if it hurts or helps cooling. Currently it's set up to go as low as 25% after it's turned on, and doesn't turn off. I haven't seen a case in my truck where it would need to turn off, but apparently my truck isn't the best test subject.  The other thing I think I'll add is a 5 or 10 second delay when you first startup to let any heatsoaking go away before the fan turns on.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: Andrewh]
#838418
05/05/11 12:36 PM
05/05/11 12:36 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
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Mercedes runs the fan at full speed for a few seconds when the engine starts.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Mercedes fan upgrade
[Re: feets]
#838419
05/05/11 12:47 PM
05/05/11 12:47 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
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I currently only have the fan turn on once the temperature is within 5 degrees of the target temperature, and then it comes on at 45%. After that, feedback controls the speed to maintain the target temperature.
Think I should do more like mercedes and turn it to full speed on startup for a few seconds, then let it go back to idle speed until it needs the additional cooling?
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: hooziewhatsit]
#838420
05/05/11 01:03 PM
05/05/11 01:03 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
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I don't think it's necessary to start the fan with all engine starts.
If there's enough heat soak to fire the fan I don't think it will hurt anything.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Mercedes fan upgrade
[Re: feets]
#838421
05/17/11 12:01 AM
05/17/11 12:01 AM
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Joined: Feb 2003
Posts: 8,692
Andrewh
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Re: Mercedes fan upgrade
[Re: Andrewh]
#838422
05/17/11 12:51 AM
05/17/11 12:51 AM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
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I've been driving the truck around town, and finally got it out on the highway yesterday. At 55mph, with the fan turned off, my temps continue to increase. Oh, and it was only 45*F out.  Other than that, around town it varies the speed quite nicely to maintain the set temperature. With a new waterpump and thermostat it might even work better. Tomorrow I hope to have time to move to the actual circuit board to test for a couple days, then I'll send one to Andrew to test (along with a programmer so he can update the software on it if need be). So, it's moving along, just not as fast as I had hoped.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Mercedes fan upgrade
[Re: John_Kunkel]
#838426
05/17/11 07:57 PM
05/17/11 07:57 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
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We're talking about electric fans that are hard to find factory installed on pre-85 cars. Naturally, you have to find cars that have successful application of electric fans and use what you can from the engineering and design that manufacturers paid huge amounts of money to develop.
Electric fans have their benefits. Chief amongst them is the end user being able to do what he wants with them.
If you don't want it, don't use it.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Mercedes fan upgrade
[Re: John_Kunkel]
#838428
05/18/11 03:19 PM
05/18/11 03:19 PM
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Irving, TX
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Put down your agenda and go read the post again.
Modern cars turn the fans off at speed. NASCAR doesn't even HAVE a fan. In fact, many race cars don't have fans. They even run long stretches of caution laps at 55 to 70 mph without overheating. Don't forget those guys tape up the grilles to limit cooling air in the quest for top speed aerodynamics.
Your mechanical fan DOES NOT pull as much air through the radiator as you get cruising at 60 mph. Prove me wrong.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Mercedes fan upgrade
[Re: feets]
#838429
05/18/11 04:31 PM
05/18/11 04:31 PM
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Joined: Oct 2007
Posts: 3,903
Oregon
hooziewhatsit
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well poo  Got the old waterpump out, and from what I know it appears like it should work a lot better than the new one. Same number of vanes (8), and they are wider and closer to the front and back walls of the water pump/timing cover. No play in the shaft, but the vanes have rubbed on the WP housing a bit 
If you ever find yourself in a fair fight, your tactics suck.
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guess it's time to spend $50 at rockauto for a new water pump, tstat, and rad cap. 
