Coolant temperature review

[X5chemist]

We know. Just curious on performance thermostat replacements.

Thanks workingonit! I'll add it to my replacement parts lists.

[aureliusmax]

I bought my thermostat from an indie manufacturer called BAVlogic, the guy is very knowledgeable and can be caught on his business phone number for a chat to ask/answer questions. He buys an OEM bmw thermostat, takes it apart and re-calibrates it, then re-assembles it - what ever special process that is. So yes I have one in my N62 and it works as advertised. The actual temperature that reported is higher and that's what expected in the computer programming. But measuring the temperature of the output hoses with a temperature gun shows running at 90 degrees.
His website also offers a great deal of tips and knowledge.
https://www.bavlogic.com/?p=4035

[oldskewel]

Originally Posted by aureliusmax

... He buys an OEM bmw thermostat, takes it apart and re-calibrates it, then re-assembles it - what ever special process that is...

Great lead on that - I read the whole rant on that page , and found almost everything matching my current understanding of things.

Do you have any idea about what is done to modify the thermostat?

I've seen drilling holes in it (example pic below), but would prefer a mechanical modification to the opening temperature setpoint, rather than a simple always-on bypass.

So for example, did you see holes in the plate?

[Bdc101]

Originally Posted by https://www.bavlogic.com

I UNDERSTAND, LOTS OF YOU WILL SAY BMW ENGINEERS DESIGNED IT, AND WHO ARE YOU TO SAY THAT? WELL, I HAVE MECHANICAL ENGINEER DEGREE AND OUR PROFESSOR ALWAYS TOLD US, THAT 90-95C IS THE BEST RUNNING TEMPS FOR THE ENGINES, EVERYTHING HIGHER GETS YOU DETONATION RISKS AND NOT MAKE MUCH SENSE TO GET A LITTLE BETTER MPG... HOW ELSE TO EXPLAIN HIGH ENGINE RATE FAILURE IN BMW COMPARED TO SIMPLE TOYOTAS AND HONDAS?? EVEN KIA IS WAY MORE RELIABLE THAN MODERN BMW, THEY ALL RUN 82-87C TSTATS WITHOUT ANY INNOVATIONS. MERCEDES ALSO RUNS IT COOL 90-95 MAX, THEY HAVE OTHER ISSUES, BUT COOLING SYSTEM IS RELIABLE AND NOBODY REPLACES VALVE SEAL GUIDES AFTER 40-60K MILES ON THEM, NORMAL ENGINE CAN EASILY LAST 200KMLS ON ORIGINAL VALVE SEALS, AND SAME PARTS SUPPLIERS USED FOR BOTH BRANDS BY THE WAY.

This guy has all the credibility of the wacko conspiracy theorist who inhabits the comments section on my local channel 7 news website. Yikes



Source: am also mechanical engineer who is not completely insane.