[grue19]

wow so i cant believe that the grilles stary closed when its 90 degrees out and i pull into my garage shut the car off and end up heating the garage over and above heat gain from the weather etc.

this just cant be good to retain all that heat in the engine and not let it cool down qucker? heck or just parking it outside when i go to work.

i inow they open when in any of the sport modes but only when needed in comfort and eco pro. but then just stopping and parkung they close. hm.

or am i just over worrying?

[SamS]

You're over worrying. I've had my M40i for 6 months, I've only noticed the grills open once. It was 100F and I had been in stop and go traffic for over an hour, when I got home.

[RichM50d]

Originally Posted by SamS

You're over worrying. I've had my M40i for 6 months, I've only noticed the grills open once. It was 100F and I had been in stop and go traffic for over an hour, when I got home.

How do you find the M40i after your M3?

[SamS]

Originally Posted by RichM50d

How do you find the M40i after your M3?

It’s quite nice. Still fun to drive, and the tech is much better. It’s also more comfortable, in the sense I’m not worried about something breaking every time I hit a pothole, and my ingress/egress is easier.

[GT500R]

I wonder if a tune or coding could alter when the grille is open. I would prefer open more often then not for performance sake.

[sinbad4]

Originally Posted by GT500R

I wonder if a tune or coding could alter when the grille is open. I would prefer open more often then not for performance sake.

Peformance sake? Performance is better when grille is closed - better aerodynamics. Don't worry about the heat. This car does 3 things differently than any car I've owned or even read about before.

• Heat sink retention. They actually designed engine to stay hot longer. The idea being that cold starts are hard on your car. After 3 months, I can attest that the car does stay warmer longer. After 9 hrs at office, it's engine still registers some heat. Don't know exactly how they do it.
  
  
• Turbo is actually water cooled. I haven't seen this before and I love it. Turbos typically add a ton of heat to an engine compartment. By water cooling turbo, whole engine compartment temperature is reduced and moderated. Forget the days of "Turbo Timers" to cool down engine so oil doesn't coke and varnish inside turbo. Also notable that this engine uses coolant for water-to-air intercooler instead of air-to-air intercooler - a much better solution, IMHO.
  
  
• Lastly, there is no thermostat, per se, anymore. B58 engine has a coolant router, so to speak, called the heat management module. It is a computer controlled module with various valves to route coolant as required - very different from the simple thermostat that opens to send coolant to radiator when temp reaches certain level. In addition to heat management module, there are two coolant pumps, one belt driven and one electric.

I have had my grilles stay open after driving my car while my car is turned off in the garage. Even though car was "off", grille was open, fans were on and you could hear electric coolant pump running.

Bottom line, the B58 is a great engine - it's smart and will take optimal car of itself.

[RocketRomeo]

Originally Posted by sinbad4

Peformance sake? Performance is better when grille is closed - better aerodynamics. Don't worry about the heat. This car does 3 things differently than any car I've owned or even read about before.

• Heat sink retention. They actually designed engine to stay hot longer. The idea being that cold starts are hard on your car. After 3 months, I can attest that the car does stay warmer longer. After 9 hrs at office, it's engine still registers some heat. Don't know exactly how they do it.
  
  
• Turbo is actually water cooled. I haven't seen this before and I love it. Turbos typically add a ton of heat to an engine compartment. By water cooling turbo, whole engine compartment temperature is reduced and moderated. Forget the days of "Turbo Timers" to cool down engine so oil doesn't coke and varnish inside turbo. Also notable that this engine uses coolant for water-to-air intercooler instead of air-to-air intercooler - a much better solution, IMHO.
  
  
• Lastly, there is no thermostat, per se, anymore. B58 engine has a coolant router, so to speak, called the heat management module. It is a computer controlled module with various valves to route coolant as required - very different from the simple thermostat that opens to send coolant to radiator when temp reaches certain level. In addition to heat management module, there are two coolant pumps, one belt driven and one electric.

I have had my grilles stay open after driving my car while my car is turned off in the garage. Even though car was "off", grille was open, fans were on and you could hear electric coolant pump running.

Bottom line, the B58 is a great engine - it's smart and will take optimal car of itself.

Love this! Thank you for feeding my inner geek this beautiful Monday morning!

[RocketRomeo]

Can I ask where your technical diagrams are from? Are they BMW manual?

Cheers

[ZHPsedan]

You can geek out over the whole engine by reading the Technical Training document for the B58 https://f30.bimmerpost.com/forums/sh....php?t=1171642

[pskdude]

i live in South Florida, my grill is open ALL the time LOL.

[GT500R]

Originally Posted by sinbad4

Peformance sake? Performance is better when grille is closed - better aerodynamics. Don't worry about the heat. This car does 3 things differently than any car I've owned or even read about before.

• Heat sink retention. They actually designed engine to stay hot longer. The idea being that cold starts are hard on your car. After 3 months, I can attest that the car does stay warmer longer. After 9 hrs at office, it's engine still registers some heat. Don't know exactly how they do it.
  
• Turbo is actually water cooled. I haven't seen this before and I love it. Turbos typically add a ton of heat to an engine compartment. By water cooling turbo, whole engine compartment temperature is reduced and moderated. Forget the days of "Turbo Timers" to cool down engine so oil doesn't coke and varnish inside turbo. Also notable that this engine uses coolant for water-to-air intercooler instead of air-to-air intercooler - a much better solution, IMHO.
  
• Lastly, there is no thermostat, per se, anymore. B58 engine has a coolant router, so to speak, called the heat management module. It is a computer controlled module with various valves to route coolant as required - very different from the simple thermostat that opens to send coolant to radiator when temp reaches certain level. In addition to heat management module, there are two coolant pumps, one belt driven and one electric.

I have had my grilles stay open after driving my car while my car is turned off in the garage. Even though car was "off", grille was open, fans were on and you could hear electric coolant pump running.

Bottom line, the B58 is a great engine - it's smart and will take optimal car of itself.

Peformance sake? Performance is better when grille is closed - better aerodynamics. Don't worry about the heat. This car does 3 things differently than any car I've owned or even read about before.

Unless you have empirical proof that performance is better when the grille is close - better aerodynamics is used for MPG and I highly doubt the gains are anywhere significant for performance (check Ford Edge active grille shutters and the 7% or so mpg they gain when closed), then its legitimately just for MPG.

• Heat sink retention. They actually designed engine to stay hot longer. The idea being that cold starts are hard on your car. After 3 months, I can attest that the car does stay warmer longer. After 9 hrs at office, it's engine still registers some heat. Don't know exactly how they do it.
  
  I can care less about cold starts, I want the grille 100% open when full throttle so the system stays cooler and in turn cools my charged air more.
  
  
• Turbo is actually water cooled. I haven't seen this before and I love it. Turbos typically add a ton of heat to an engine compartment. By water cooling turbo, whole engine compartment temperature is reduced and moderated. Forget the days of "Turbo Timers" to cool down engine so oil doesn't coke and varnish inside turbo. Also notable that this engine uses coolant for water-to-air intercooler instead of air-to-air intercooler - a much better solution, IMHO.
  
  My 1997 Volvo had a Turbocharger that was water cooled, this is REALLY OLD NEWS... I hope this isn't new news to people
  
  The cool part is the water-to-air intercooler, which is a proven better solution. And back to my point, keep the air flowing to the radiator to keep the air cooler to keep the charged air cooler.
  
  
• Lastly, there is no thermostat, per se, anymore. B58 engine has a coolant router, so to speak, called the heat management module. It is a computer controlled module with various valves to route coolant as required - very different from the simple thermostat that opens to send coolant to radiator when temp reaches certain level. In addition to heat management module, there are two coolant pumps, one belt driven and one electric.

That's neat.

Lastly here is what happens when you remove the shutter system in the Focus and where the idea came from -

[TxHornX3M40iGuy]

Originally Posted by GT500R

Peformance sake? Performance is better when grille is closed - better aerodynamics. Don't worry about the heat. This car does 3 things differently than any car I've owned or even read about before.

Unless you have empirical proof that performance is better when the grille is close - better aerodynamics is used for MPG and I highly doubt the gains are anywhere significant for performance (check Ford Edge active grille shutters and the 7% or so mpg they gain when closed), then its legitimately just for MPG.

• Heat sink retention. They actually designed engine to stay hot longer. The idea being that cold starts are hard on your car. After 3 months, I can attest that the car does stay warmer longer. After 9 hrs at office, it's engine still registers some heat. Don't know exactly how they do it.
  
  I can care less about cold starts, I want the grille 100% open when full throttle so the system stays cooler and in turn cools my charged air more.
  
  
• Turbo is actually water cooled. I haven't seen this before and I love it. Turbos typically add a ton of heat to an engine compartment. By water cooling turbo, whole engine compartment temperature is reduced and moderated. Forget the days of "Turbo Timers" to cool down engine so oil doesn't coke and varnish inside turbo. Also notable that this engine uses coolant for water-to-air intercooler instead of air-to-air intercooler - a much better solution, IMHO.
  
  My 1997 Volvo had a Turbocharger that was water cooled, this is REALLY OLD NEWS... I hope this isn't new news to people
  
  The cool part is the water-to-air intercooler, which is a proven better solution. And back to my point, keep the air flowing to the radiator to keep the air cooler to keep the charged air cooler.
  
  
• Lastly, there is no thermostat, per se, anymore. B58 engine has a coolant router, so to speak, called the heat management module. It is a computer controlled module with various valves to route coolant as required - very different from the simple thermostat that opens to send coolant to radiator when temp reaches certain level. In addition to heat management module, there are two coolant pumps, one belt driven and one electric.

That's neat.

Lastly here is what happens when you remove the shutter system in the Focus and where the idea came from -

Yes because a Focus ST is where BMW owners should turn for inspiration. Call me unimpressed...

[RocketRomeo]

Originally Posted by ZHPsedan

You can geek out over the whole engine by reading the Technical Training document for the B58 https://f30.bimmerpost.com/forums/sh....php?t=1171642

Awesome thanks! 🤓

[sinbad4]

Originally Posted by GT500R

My 1997 Volvo had a Turbocharger that was water cooled, this is REALLY OLD NEWS... I hope this isn't new news to people

That's cool. Volvo has had a lot of good tech over the years.

I don't want to get into some tit-for-tat argument or pissing contest. I doubt either of us has all the facts on this. If you honestly think removing the grille louvers will give you more HP, knock yourself out. It would be helpful (and scientific) if you would get before / after dyno runs, though it's prolly costly and time consuming - it would be interesting.

Keep in mind, from what I've seen, the diesel cars seem to not have shutters at all. Perhaps one of our 'd' drivers can confirm.. I've only seen pics onlilne.

[XXX3]

This X3 M40i is my first BMW, and the intercooler heat soak surprised me. I was in very slow freeway traffic for 2 hours and when the lanes opened up I accelerated, and it was a dog. The outside air temp was a mild 68 degrees, but the 3 to 5 mph creep in LA traffic did not agree with this turbo intercooler. No harm, no foul I guess, but no power (temporarily). Anyone else experience this?

[darrylo]

Originally Posted by XXX3

This X3 M40i is my first BMW, and the intercooler heat soak surprised me. I was in very slow freeway traffic for 2 hours and when the lanes opened up I accelerated, and it was a dog. The outside air temp was a mild 68 degrees, but the 3 to 5 mph creep in LA traffic did not agree with this turbo intercooler. No harm, no foul I guess, but no power (temporarily). Anyone else experience this?

Were you accidentally in eco mode?

[Zembla]

Sounds more like the transmission having adapted itself to walking pace traffic driving rather than any engine failing.

[XXX3]

Originally Posted by darrylo

Were you accidentally in eco mode?

I was in comfort mode. Power returned after a few miles of driving at 50-60+ mph.

[GT500R]

Originally Posted by XXX3

I was in comfort mode. Power returned after a few miles of driving at 50-60+ mph.

That's what we call heat soak... and your grille being closed doesn't help.

[XXX3]

Originally Posted by GT500R

That's what we call heat soak... and your grille being closed doesn't help.

Thank you. The heat soak caused a significant power loss...felt like a 4 cyl. If there was ever a time the grills should have been open, it was during that 2 hour crawl.

[John Casey]

Originally Posted by SamS

You're over worrying. I've had my M40i for 6 months, I've only noticed the grills open once. It was 100F and I had been in stop and go traffic for over an hour, when I got home.

Only opened once? I will need to pay more attention to this. On a drive to the mountains the other day we stopped at the top and the grills were open (outside temp was in the mid 70s).

[comber]

Stupid question... how do you notice when the grills are opened while driving?