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Old 05-27-2018, 02:41 AM   #71
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Very cool!

Any chance you can run it to a tablet mounted up front somewhere for a real time display?
I just use a laptop to take the live data. If I were more ambitious, I could write software to suit this application better. Not until winter hits again.


I just added one more mod to help with the cooling:

Quote:
One modification that I just added was to a dash switch that controls the radiator fan. The diagram above shows the circuit. All it does is to switch the fan between thermostat control, continuous run, and off. I used a lighted switch that has LED's that will turn on only when the fan is running.

One extra feature of this setup is a wire that I added that sends +12 volts to the ECM unit so that when the fan is on, it kicks up the idle slightly. This does two things, first, with the idle up, the alternator turns faster supplying more current to the fan.

Second, the higher RPM's also allow the water pump to spin faster, so the coolant flow is higher through the engine and radiator.

Normally the signal to the ECM would come from the air conditioner clutch for higher RPM's I have removed my AC parts. If anyone wants to duplicate this circuit, they should add a diode in series with the wire from the AC clutch going to the ECM. this will prevent interference between the two signals.
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Old 05-28-2018, 07:16 AM   #72
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Slick

I notice when in thermostat mode the LED only lights up when the fan is on instead of all the time. That's on purpose?
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Old 05-28-2018, 08:22 AM   #73
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Slick

I notice when in thermostat mode the LED only lights up when the fan is on instead of all the time. That's on purpose?

Yes, that way I know when it is running, usually I can tell by its roar, but sometimes with a lot of road noise, I cant tell if it is on.
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Old 06-17-2018, 01:50 AM   #74
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I did a fully loaded run on the same roads yesterday.
Motorhome fairly full. About 2500 pounds of trailer in tow.
Outdoor temps about 75.

The water pump fan only came on a few times and the same for the electric fan. My old radiator would have had both fans screaming all the way up the hill.

The trans. fluid temp crossed 250 briefly at the peak load.

The "cooled" trans & engine coolant numbers (dashed lines) look good to me, hanging fairly steady below 150F.

The trans. fluid differential shows the radiator and external cooler combo was pulling 100 deg. out of the fluid before returning it to the transmission.


I need to work with the engine data to see how much variation I get between RPMs and MPH to see if there is too much transmission slip, but overall I am less worried about this radiator after I added the external transmission cooler.
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Old 06-17-2018, 04:52 AM   #75
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Wayne, the numbers look good.

What are the units for the x-axis, minutes?
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Old 06-17-2018, 06:43 AM   #76
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Wayne, the numbers look good.

What are the units for the x-axis, minutes?
Arbitrary, 1 unit per sample. The total trip was about 35 min. long
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Old 06-17-2018, 12:54 PM   #77
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The only thing number that might concern me is the peak temperature on the transmission output. It seems a little high but I'm no expert!

Brad
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Old 06-17-2018, 02:16 PM   #78
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The only thing number that might concern me is the peak temperature on the transmission output. It seems a little high but I'm no expert!

Brad
It is possible that I am having slippage in the transmission That is why I need to check the rpm's vs speed to see what is up but I dont have my spread sheet program out here in the woods. That will be next sundays project.

The trans. fluid is also not the pure red stuff it once was. It is a dull red and less clear to see through.
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Old 07-03-2018, 07:51 AM   #79
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Have you considered running a line from your fresh water to a mister in front of the radiator, just to flip on when it needs it most, like hill pulls?
I'm considering it, a 12V pump and some hose, i hear misting the radiator gives it a significant cooling capacity boost but I haven't looked into the numbers too much
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Old 07-03-2018, 08:33 AM   #80
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I have it installed with a switch on the dash. I just use the fresh water pump with a line run to the front.
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Old 07-03-2018, 09:45 AM   #81
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My bad, i got turned around with this and another forum, and forgot you already had one installed!

Have you had a chance to really put it to the test?
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Old 07-03-2018, 10:06 AM   #82
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My bad, i got turned around with this and another forum, and forgot you already had one installed!

Have you had a chance to really put it to the test?
I have not needed it with the new radiator and tranny cooler, but I have not been out in anything higher than 80 deg with a full load.

I have 2 runs in August that should test the limits of my setup
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