12-10-2020, 01:33 AM | #1 |
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X5M s63 Cold 90C Thermostat
Guys, I've just serviced my S63 and almost changed everything on it. It was most expensive service in my cars. So, I started finding solutions how to reduce heat in my s63 because we know that this 105C working temp. kills all this seals, rubber and etc.
I was thinking to buy HT 90C thermostat from ECS but done research about this cold thermostats and find out that this 90C thermostats mechanically tries to open after 90C. Thats why it runs from 90C to almost 100C just unstable. Our thermostats are map controlled by car ECU. Because of that car is unstable under this cold therm. ECU tries to reach its working temps when 90C mechanical thermostat opens thats why we will have rich mixture and errors in ECU. Also I find out that its possible to program ECU and it will open therm. on 90 or 95. So what do you think about this cold thermostats? P.S. I monitored my car and it always runs 105C to 108C |
12-10-2020, 02:01 AM | #2 | |
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12-10-2020, 04:04 PM | #5 | |
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about HT thermostat from ECS you can find reviews on youtube where it goes from 93C to 100C and even more in some cases. Also you can easily find the main solutions on youtube how people make this "cold thermostat" in case all this thermostats are some kind of fake and just working mechanically. ECU always sees that temp is below normal and tries to warm it up. Because thermostat is electronically controlled by ECU |
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12-10-2020, 04:14 PM | #6 |
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Yes, thats the main thing that our thermostats are map controlled and ECU can be tuned in different heat ranges
I've found out that cars produced for Republic of South Africa has set in ECU to open on 95C and its set by BMW. So, is there anyone who can tune our ECU's and find that map which controls thermostat to set desired values or is there somebody who can flash RSA program in S63 ECU? This is right way to naturally lower our engine's temps |
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12-10-2020, 06:59 PM | #7 | |
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I'm getting a retune for my larger turbos and I'll ask my tuner about this. |
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12-10-2020, 11:59 PM | #8 | |
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12-11-2020, 04:06 AM | #9 |
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12-11-2020, 04:08 AM | #10 |
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12-11-2020, 03:32 PM | #11 |
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Get a turbo blanket. This is scientifically proved to improve performance, and control the damage cause from heat.
BMW engineered this coolant t stat, and oil t stat for a reason. And I can guarantee they have performed more testing than any of these manufacturers selling lower temp t stats. Only use Genuine parts on a vehicle like this. Unless your planning to track your x5 M, and have it professionally tuned by Nick Pavloski I would stick to what the manufacturer specifications. (Dinan is the only trusted company for aftermarket parts, and engine mapping.) |
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12-11-2020, 11:46 PM | #12 | |
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Anything BMW recommends has been filtered by Government Compliance, Management and Marketing. It is NOT direct from the engineers. Some of it is good, some of it is ABSOLUTE BS. Check on BMW's recommendation on oil changes for the 8 speed vs what the actual manufacture of the transmission recommends if you want just one example. BMW engineers are brilliant, their management and marketing that have the final say....not so much. Last edited by Sophisticated Redneck; 12-11-2020 at 11:59 PM.. |
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12-11-2020, 11:48 PM | #13 |
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12-11-2020, 11:57 PM | #14 | |
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A tune would be great but I have yet to find anyone with the knowledge to tune the thermostat. |
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12-12-2020, 02:21 AM | #15 | |
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You are absolutely right, nothing to add |
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12-12-2020, 02:27 AM | #16 | |
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I couldn't find any additional info in internet about this tune |
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12-12-2020, 08:10 AM | #17 | |
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I have done the “90c” thermostat on my 4.8i, X5m and n63tu 550i. I’ve done bmw logic 7 and hamburger tech I mean Hamburg tech. Anyway I ordered 2 HT thermostats and installed them and both were defective. Didn’t lower the temp at all from the standard 105c. So I had to remove them and send them back. Tstat swaps are such a pain with that one bolt... So I swapped logic 7 and never looked back. On the 550i It does not make a lot of difference. The car has other tools at its disposal to control coolant temps beyond the thermostat like grill shutters and etc. so it typically hovers at around 95-98c in cool weather and 105c when sitting in hot weather, I think the cooler Tstat is a good idea for engine longevity, but it will hurt fuel economy slightly as more combustion heat is lost to the cooler cylinder walls, and it takes longer for the oil to get to full temp in the winter. There is also the concern the oil may not get hot enough in cold climates to evaporate out contamination. I’ve done this mod 3 times successfully. I’d also recommend a turbo blanket and heat shielding for the rubber lines to help increase their longevity But remember these are old cars and especially in hot climates the plastic under hood becomes embrittled. Cooling the temps helps, but plastic wears out. Last edited by Thecastle; 12-12-2020 at 08:15 AM.. |
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12-12-2020, 08:18 AM | #18 | ||
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My mechanic can tune our ECU but he says that there is 37000 maps in ECU and we should know exactly which one is responsible for thermostat. |
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12-13-2020, 07:07 PM | #19 |
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Im with redneck on this one temps are now just under the 210mark and when pushing the vehicle it gets just over 210 much better then before where it was always over 210.
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12-15-2020, 03:36 PM | #20 |
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Spoke with my tuner. He confirmed it's doable (dropping the coolant temps via tune) but advised against it for folks who live in somewhat colder climates like myself here in NJ.
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12-15-2020, 05:39 PM | #21 | |
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In my country summer is over 40 celcius hot |
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12-17-2020, 06:56 AM | #22 |
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Again, some of us have already tried a lower temp tune. The tune just turns on the heating element in the thermostat triggering it to open sooner same as the factory tune can. Leaving the heating element on all the time will cause it to fail earlier. That’s why everyone who wants this mod ends up eventually with a recalibrated thermostat.
Stock cruising temp is 105c. The lowest modified temp is 93c. Any lower and you’ll throw a check engine light for tstat failure. I’m sure a software person could block that code. The biggest downside to this is lower fuel efficiency and lower oil temps, which can be a problem in cold climates. Though I don’t think it’s a big deal. Also if you run in m mode the car drops it’s temps automatically for better timing advance. I’ve been running modified thermostats on a 2008 4.8i, 2011 X5m and 2016 550i and thus far haVe noticed no downsides, or benefits. I do notice on my 550i. It takes a very long time to have the oil reach full temp, like in cold weather, 30mins around town isn’t going to do it. X5M oil temps seem unaffected. Also the 550i keeps itself around 98c coolant in hot weather but still gets to 102-105c when sitting in traffic. |
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