BMW B58 Turbocharger: How it works 

You are very welcome.

Yea the b58 is fast I drove the 2021 540i

@@gottgaame Indeed matey. It seems any version of the B58 is fine on stock internals up to about 650bhp. Some seem to be running 700+ on stock pistons and no issues yet, incredible really.

@@DjNikGnashers we shall see how long it will hold up with any tune up to that horse power.

Thank you, really appreciated...

Wow, thank you Peter!

I hope you like tomorrow's video...

Muchas gracias :)

Awesome, I like the suggestion!

Hi, here's a link with some advice. www.whatcar.com/bmw/m140i/hatchback/used-review/n18884/advice The standard advice when buying a used car applies of course. Also check the coolant in the expansion tanks (known issue that the B58 loses coolant) as well as signs for any coolant loss in the engine (dried coolant residue), and check for rattles from the exhaust (know issue that stock exhaust can rattle). Check if the radiators (intercooler and auxiliary) have stone guards, and if they don't check the radiators for damage and leaks.

You can check engine oil levels under vehicle status in iDrive. Mileage is low but still check to see if oil changes were done. Future problems could involve carbon build ups, leaks from valve cover, cracking of plastic charge pipe, thermostat and water pump failure. These are minor repairs if you get them done at non-dealer mechanic.

Hi, yes you make good points, and as you say it is the temperature increase which decreases the density, so in effect the density decrease from temperature increase is countering the density increase that pressure increase offers, so the intercooler is there to decrease the temperature of the pressurised air to make the air denser.

@@NoBrainerTalk Yeah that’s also what I was thinking. Really informative video regardless.

Hi, do you mean what options you have to tune the engine? Oh man there are so many, it would deserve its own video.

@@NoBrainerTalk yes !the best options on the market. How far can you go with the standard pistons of the B58. What can you do in terms of upgrade turbo? Seems an interesting video about how the block is designed. keep it up

1st gen B58 and B58TU1 engines have an electrical wastegate valve (so regulate the exhaust side of the turbo to control boost), but B58TU2 engines seem to have a blow-off valve (so regulate the intake side of the turbo to control boost) . The reason for this change is unclear, but if I had to guess, venting excess exhaust gases vs venting intake air to regulate boost might have some impact on emissions. With the 48V mild hybrid assistance system as standard on the TU2, the B58TU2 might afford to sacrifice some minor performance from the engine itself to achieve reduced emissions. This is pure guess work.

You are not correct because the B58 uses Mass Airflow Sensor Part Number 13628605565 (made by Bosch). It might also measure or help the ECU calculate intake temperatures and gather other data.

I don't know, someone would need to install special sensors to determine that (on a Stage 2+ tuned engine that is achieving the maximum power possible from the stock turbo), or perhaps it can be deduced mathematically from the power output of such engine. I doubt we will ever know unless we happen to speak to the development engineers who designed and tested it.

Yes. :)

@@NoBrainerTalk It’s quite obvious from your technical videos :) I also own one of these cars and have a wealth of knowledge about them, so if you ever need any advice from a fellow enthusiast :)

@@harbl2479 Thank you, that's very nice of you.

Yes, if it's a G20/G21 (M340i) then it has a B58TU and if it's a F30/F31/F34 (340i) then it has 1st gen B58.

M140i

@@NoBrainerTalk HOT HATCH!

Thanks, the feedback for the background music is well received. I have it in mind for the future videos but for the existing ones, don't think I can change it.

After all that work I put into it, I see you are very hard to please.. :)

@@NoBrainerTalk I was wrong, was looking at the supra engine, but noticed at the end you did display the turbo for it. Good description and effort. Would be nice to know the turbo specs.

Yes it is. This means the exhaust manifold feeds the air into the turbine in two separate streams so that each cylinder exhaust gases interfere as little as possible with each other (resulting in improved scavenging of the exhaust gases and less impeded flow into the turbine).

Twin scroll = single turbo

Hi, thanks for the feedback. Yes I am aware that occasionally the background music comes across as too loud, I can't explain why some people are experiencing this, while most don't. I have certainly taken it into account for the later videos, so some feature no background music and I have reduced the volume of the background music in the latest videos.