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  #61  
Old 05-20-2024, 05:57 PM
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drove the X today, testing various fan speeds

I don't drive the X5 very often, only adding 1575 miles in the two days short of three years since I traded for it (under 1.5 miles per day), so it took me three weeks since I finished the fan speed controller install (plus the unexpected replacement of two failed switches) to actually road test it. The wife loves her Lexus more than she likes my BMW, so we use her car (with her driving 99% of the time), while my vehicles sit unused.

Anyway, I drove to my Dr. this morning, and tested the controller power level vs. noise level vs. coolant temperature, as I drove along in 30-50mph traffic.
  • 1) the fan came on automatically at 75% power @ 175F, as I had set it to do, as I left the house, then
  • 2) at the first long stoplight, I increased the fan speed to 85% when the coolant reached 194F (after which, the coolant moved down a bit to 188F), then
  • 3) when the traffic thinned out, I reduced the power to 75% again, and the temperature remained relatively constant at 189-190F 'til I reached the Dr's office (the return trip, in 90F ambient, was done at 75% power, and 190F coolant temp)

As I stated in an earlier post, 75% power will be the new default setting for my fan, unless I desire to increase it as conditions may dictate in warmer weather...I probably won't go lower than 75%, even in winter, unless it gets really cold. At 75%, with the windows up, I can't hear the fan going, but at 100%, it roars. 75% power should reduce the airflow rating from 3000 cfm to 2250 cfm, which should be sufficient for my M54 under normal weather conditions.
Name:  cfm rating chart, Summit Racing.JPG
Views: 39
Size:  42.5 KB from Summit Racing

I'll vary the fan speed as I need, balancing coolant temperature vs noise level, and more importantly, trying to extend the life of the fan by reducing its' usage. I intend to turn it off at highway speeds, if the coolant temp stays around 190F, so that will definitely preserve the fan for longer.
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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  #62  
Old 05-20-2024, 07:37 PM
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Did you give any thought to just installing a stock PWN puller fan? I'm not sure if the E53 4.8is fan would have worked (4 wire whereas I believe earlier models were 3 wire), but an E60 or similar fan would have, either with very minimal custom fitting work or even bolt on if the fan motor fit the 4.4/4.8is puller shroud. Then you'd have DME control over the fan, varying based on ambient temp, engine load, coolant temp and other factors. If a single puller fan is enough to cool a 4.8is it's surely enough to cool a 3.0
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  #63  
Old 05-20-2024, 10:15 PM
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I go with what I know (or think I do)

Quote:
Originally Posted by BimmerBreaker View Post
Did you give any thought to just installing a stock PWN puller fan? I'm not sure if the E53 4.8is fan would have worked (4 wire whereas I believe earlier models were 3 wire), but an E60 or similar fan would have, either with very minimal custom fitting work or even bolt on if the fan motor fit the 4.4/4.8is puller shroud. Then you'd have DME control over the fan, varying based on ambient temp, engine load, coolant temp and other factors. If a single puller fan is enough to cool a 4.8is it's surely enough to cool a 3.0
When I replaced the failing viscous clutch fan 2.5 years ago, I thought of getting a second Auxiliary fan (aftermarket, not BMW) to install in place of the clutch fan, by reversing it within its' own shroud, then connecting it to the existing PWM wiring, in order to do much as you've suggested. I have had little to no experience with BMW or PWM wiring, so I fell back into my comfort zone, and bought an electric fan from a manufacturer I'd used before. I've installed many on many vehicles, though never on a BMW. As for getting a BMW 3-wire or 4-wire fan from a specific model to use, it seems much easier to run standard fan wiring and only have to worry about getting a properly-sized fan with enough airflow that would fit in the vacated space.

I certainly would've liked to have the replacement fan controlled by the DME, but I didn't want to experiment and mess it up, or have both the replacement and Auxiliary fans fail to function, due to my efforts. So, after I considered making a motor controller (mostly under my control) do the same, without damage to the Aux fan's PWM wiring, I "redneck-engineered" a simulacrum, and added to my limited electrical knowledge base at the same time.

My wiring is a mess (it always is: I believe in function first, form second), but the system is working as I had imagined it, and was probably cheaper to build than if I used new or used BMW or BMW-aftermarket parts. Besides, I'm an inveterate tinkerer from way back, and had fun getting my Rube Goldberg-ian fan & controller assemblage to work!
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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  #64  
Old 05-21-2024, 07:12 AM
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Water flow is important too? Are you running a stock plastic impeller? Cooling on mine is better with a metal and 125,000 warranty water pump. If it's moving, 190F is a normal temp. The mechanical fan and auxiliary fan keep it cool in slooooowww traffic.
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  #65  
Old 05-21-2024, 12:12 PM
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Quote:
Originally Posted by X5chemist View Post
Water flow is important too? Are you running a stock plastic impeller? Cooling on mine is better with a metal and 125,000 warranty water pump. If it's moving, 190F is a normal temp. The mechanical fan and auxiliary fan keep it cool in slooooowww traffic.
As far as I can tell, the water pump is original (the unused fan mounting threads look ancient), but I haven't cleaned it up to look for a manufacturer or part number stamping on it.

At 210583 miles, it shouldn't be original, but the first owner seems to have maintained it well, and the second owner (who bought it specifically to semi-restore in order to swap for my Chevelle) didn't replace it (or the failing viscous clutch fan assembly), when he renewed the rest of the cooling system.

I haven't detected any seal leakage, shaft wobble, or the sounds it would make if the pump was failing, yet, but I'll clean it up, look for identifying marks, use my automotive stethoscope to listen to it, and then I can judge its' provenance and internal health better.

If and when I need to replace it, I'll be buying a Stewart water pump. I've used a few on previous trucks and on my race Chevelle (before I installed a Meziere 55 gpm electric pump), so as usual, I'll go with what I know (and trust).

Sent from my SM-G965U using Tapatalk
__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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  #66  
Old 05-21-2024, 02:33 PM
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