[CT335xi]

Originally Posted by stylinexpat

I am surprised, I never owned one that gave me engine trouble in all honesty. Change the oil every 4000-5000 miles and do maintenance on it before you are supposed to do them and you should have no issues unless you had bad luck and got a lemon (that does happen though unfortunately)..

Wasn’t the engine but everything else .... fuel injectors, fuel pump, and coils to name a few but was definitely a bad ass engine with great tuning potential!

[Teutonic]

Originally Posted by stylinexpat

I am surprised, I never owned one that gave me engine trouble in all honesty. Change the oil every 4000-5000 miles and do maintenance on it before you are supposed to do them and you should have no issues unless you had bad luck and got a lemon (that does happen though unfortunately)..

I did oil change at every 6000 - 7000 KM (not miles) and everything that was needed or not needed way ahead of BMW service book, overly maintained (always at the same dealer since day one with no exception) and never abused. At 80,015 km and 7 years my engine blew. The chain snapped (plastic tensioners broke in pieces) and I was forced to buy a brand new engine in value of 27,000 dollars (yep, you read that correct). Now they are facing a class action suit for this as they knew but never issued a recall. Just saying...

[Giggler]

Originally Posted by mkoesel

The winning engine is the B58B30O1. The press release calls out all four vehicles it is available in.

B58B is Supra and B58D is M340i... no?

[nicky dj]

Originally Posted by fastboatster

N54 was also BMW's first production turbocharged engine in decades. They had an n55 which was reasonably reliable and b58 looks like it has many kinks on the n55 worked out. It has a mechanical water pump now, for example.

I'll second that, the N54 block was unparalleled in its strength and strong forged internals hence why it won awards. Many run the N54 to 200,000+ miles and get the same performance out of without degradation.

Just like any BMW, what becomes the maintenance nightmare is all the components around the block that would fail - the electric water pump, the HPFP, the gaskets, the brittle plastics etc.

[mkoesel]

Originally Posted by Giggler

B58B is Supra and B58D is M340i... no?

No, the Supra uses the B58C, which is an alias for the B58B30M1.

It is, However, rumored that non-WLTP countries will get the O1 in March.

[Jklad]

Originally Posted by 335xs2dinan

I've put 175,000 miles on my n54. Wouldn't hesitate to get a b58 powered vehicle as it's successor if the n54 ever stops pulling its weight.

I'm right behind you at 150k! It's been hell lol

[fastboatster]

Speaking of gaskets, b58 uses RTV instead of conventional rubber gaskets on many sealing surfaces. This is also claimed to improve the reliability. Whether this is going to be the case remains to be seen, however. Although, at least in my experience, good RTV seems to hold up a lot better than rubber gasket presumably made out of recycled rubber. Too bad Zupra hyped up the B58 motor and a lot of “tuners” will likely start buying 340is with this motor “cause it got Supra engine, bro”. B58 most likely won’t stay a hidden gem like the n54

[DPelletier]

Originally Posted by 440xiGCMSport2

Anyone know what the internal differences are between this high output B58 O1, the lower output B58 M1, and the original B58 M0?

This post from awhile back touches on some of the differences:

No. While I'm sure you can get the UK spec engine to produce as much or more power than the non-UK version, they are different engines. The UK version is a B58B30M1 whereas the "non UK" market uses the B58B30O1.


a related article (the Supra uses the B58B30M1);

Why the Toyota Supra Makes Less Power Than the BMW Z4
The engines are nearly equal, but not equal enough.

The Toyota Supra shares a platform and a large majority of its components with the BMW Z4. But as we discovered last summer and recently confirmed, the Z4 will make 47 more horsepower than the Supra in top trim. Since ECU tuning has become so advanced with modern engines, the automatic response might be to think that it is all in the programming. A BMW parts catalog reveals that the changes go further than the code.

According to the BMW ETK catalog, the US variant of the Supra will be equipped with the B58B30C engine. It carries part number 11002463592, and seems very similar to the engine for the US-spec Z4 M40i. However, the Z4 engine is actually the B38B30B, and has part number 11002464415. What does that mean? There are internal differences. Searching the interchanges for the two part numbers shows that the US Supra engine is the same as what Europeans will see in their variant of the Z4 M40i, while the US M40i engine will be used in the new G20 M340i 3-series.

Digging into the motors reveals that the first different part is the cylinder head. The Z4 has a cylinder head part number of 11127934495 while the unit in the Supra is marked as 11127934494. The differences are not apparent based on the catalog illustration, and instead are likely to be in the castings of the cylinder heads as both use the same exact camshafts, valves, and ancillary components.

Moving to the bottom end, both engines use the same crankshaft and bearings, but the pistons and connecting rods are different. The Z4 piston–part number 11258678934–is found in a variety of BMW products including the US M340i and European spec 7-series sedans. The Supra piston–part number 11258681079–is found in the motor for the US spec 7-series and the X7.

Based on the catalog entries, basically every other component seems to be the same. The final difference appears to be in the turbocharger. The Z4 uses part number 11657934387, which is only shared with the M340i, while the Supra uses part number 11657934332, which is only shared with the Euro-spec Z4 M40i. Even though the turbocharger appears to be different, all of the clamps and mounting hardware are the same between the two. Even though the unit on the Z4 might have bigger wheels in it, there is a good chance that it should bolt right up to the Supra.

The hardware for the ECU is even the same; the two cars share the 86T0 DME. After looking at the parts, it doesn't look to be very hard to replicate the power of the M40i in the Supra.

For those that want to make an OEM equivalent, the primary components to change will be the pistons and rods as those are likely built to withstand a little more boost. Swapping the cylinder head and turbocharger would complete the package. A tune will take advantage of all of those components.

We’re likely to see tuner shops digging into these cars as soon as they hit the ground. Based on what I see here, it likely won't be very complicated for them to make even more power than the Z4 M40i.

cheers,
Dave

[G80CDC]

Love my B58. I chose the 540 over the 530 due to various reviews I read that gushed over the effortless power and the smoothness. I'll admit ... once I owned it I was surprised at just how smooth it really was. Couldn't be happier.

I know mine has less power than the M340 but still....

[quick6]

Got the new M340i for the wife to go with my M6 and quite frankly, love driving the M340i around town because of the ride and general lightness. It performs well and I'd buy another.

[greekcs]

Loving my M340i so far. The engine is just as smooth as the old N55 but with better power across the entire range.

[F32Fleet]

Originally Posted by fastboatster

Speaking of gaskets, b58 uses RTV instead of conventional rubber gaskets on many sealing surfaces. This is also claimed to improve the reliability. Whether this is going to be the case remains to be seen, however. Although, at least in my experience, good RTV seems to hold up a lot better than rubber gasket presumably made out of recycled rubber. Too bad Zupra hyped up the B58 motor and a lot of “tuners” will likely start buying 340is with this motor “cause it got Supra engine, bro”. B58 most likely won’t stay a hidden gem like the n54

Unfortunately neither the valve cover gasket nor the OFHG use RTV.


VCG: 11129894803
OFHG: 11428583896/97

[OUGrad05]

Originally Posted by chassis

Congrats to BMW. I would like to see a more rigorous comparison of engine-only characteristics. This is, after all, an engine comparison. It should not be influenced, as it is, by vehicle and transmission pairing.

For example:
- power to weight
- power to displacement
- brake specific fuel consumption
- brake specific CO2 output
- novel technology (induction or exhaust, material choices, manufacturing process technology)

I agree, I also tend to take this as an indicator of initial engine life. I believe Ward's also handed out this same award to the N20 several years in a row and that turned out to be an engine that ate itself after very few miles.

[chassis]

Originally Posted by OUGrad05

I agree, I also tend to take this as an indicator of initial engine life. I believe Ward's also handed out this same award to the N20 several years in a row and that turned out to be an engine that ate itself after very few miles.

Ward's has a decades-long relationship with the automotive industry, and the companies therein. It is in Wards' interest to publish supportive information about products, and steer a wide path around what may be unsupportive information, accurate and helpful to consumers though it may be.

[MmmmmM2]

I definitely love my B58. It's a beast, especially with MPPSK!!

[Lucky1]

Originally Posted by CT335xi

Wasn’t the engine but everything else .... fuel injectors, fuel pump, and coils to name a fuel but was definitely a bad ass engine with great tuning potential!

I get this argument after hearing it so many times but its kind of hard to separate the overall package. Sure problems with the engine itself would be worse but does it really make you feel better that its robust while everything else around it is problematic? The whole package should preferably be reliable to really call the platform reliable and ease ownership stressors. If the fuel injectors and fuel pump required by the N54 are unreliable I'm going to say the N54 is unreliable and not distinguish between them as mutually exclusive.

[fastboatster]

Originally Posted by Lucky1

I get this argument after hearing it so many times but its kind of hard to separate the overall package. Sure problems with the engine itself would be worse but does it really make you feel better that its robust while everything else around it is problematic? The whole package should preferably be reliable to really call the platform reliable and ease ownership stressors. If the fuel injectors and fuel pump required by the N54 are unreliable I'm going to say the N54 is unreliable and not distinguish between them as mutually exclusive.

Come on, replacing broken injectors is NOT the same as replacing the engine or replacing the pistons and rings because their design is faulty. While you might not distinguish between the reliability of an engine itself and its auxillary components, most people will do. Even if it turns out to be the same number of shop hours, for an average diyer this will be a difference between basically junking the car or being able to repair it yourself.

[Lucky1]

Originally Posted by fastboatster

Come on, replacing broken injectors is NOT the same as replacing the engine or replacing the pistons and rings because their design is faulty. While you might not distinguish between the reliability of an engine itself and its auxillary components, most people will do. Even if it turns out to be the same number of shop hours, for an average diyer this will be a difference between basically junking the car or being able to repair it yourself.

Yes but is it too much to ask to have reliability in both areas? Comparably if an N55, B58 has both a reliable engine and bolt ons/supporting equipment I would consider it the more reliable platform and evaluate it favourably as a choice. That was more my point. All else being equal if the N55 has less auxiliary component failures (fuel pump, turbo wastegate rattles, whatever) I'm not going to say the N54 is just as reliable as the N55 even if it could go the same mileage without a rebuild. Just my way of looking at things.

[fastboatster]

I totally agree that the n55 is more reliable than the n54 as a package. Yes, it's good to have the entire package with no major issues

[heavyD^2]

I know a lot of people that won't buy BMW's today because of all the issues they had with the N54 especially the HPFP failures which is a shame because the N55 was a workhorse engine and it appears the B58 is another step forward in performance/reliability.

[FitzMLife]

N54 sound is still a thing of beauty. I have a B58 and an N54 in my driveway and there's no comparison in which I'd rather have. Can someone put my N54 in my M240i? Lol

[ztx84]

I absolutely love my B58 too... a really good all round engine, good performance, great economy for what it is, and so incredibly smooth. I'm so impressed with it that I've decided my next car will be an 840i. I know the M850 is quicker, but I just personally prefer the B58 engine - I figure it will be more reliable in the long term, and the cost of the M850 is just too much to justify I feel.