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N54 vs B58
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05-02-2016, 09:47 PM | #23 | |
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What makes the S55 amazing is the High flowing turbos for stock size, essentially what BMW did was take all the things that make N54 great, add all the Technology and reliability from the N55, and put it in a capable chassis with an LSD ETC. The B58 is just next evolution of the N55 and I wont think Bmw will ever make a true replacement of the N54. The main reason we got so lucky with the N54 is because it was overbuilt as BMW was just re-entering the Turbocharged game and they didin't want major failures and didn't have enough data. From a financial perspective it was wasteful of them to put two turbos that can flow 20+psi when the goal was just 8 PSI, or the forged internals that weren't necessary to hold a measly 300HP. Thats why they fixed all those things on the n55 when they had the reliability data and realized that the internals and turbos weren't the weak points, but HPFP and injectors were. |
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05-02-2016, 09:47 PM | #24 |
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S55 has been out for 2 years and someone's doing 10.2s.
Yes the price bracket! Cheapest one in Australia at the moment is 128k and there all auto! I'm talking 2nd hand also. |
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05-02-2016, 10:25 PM | #25 | |
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05-03-2016, 10:44 AM | #26 |
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I think they over engineered some components and fell short on many components as well. At least the engine internals are pretty solid. It's too bad the gaskets and everything around it falls apart far to early. But this may just be an overall Bmw problem.
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05-03-2016, 11:29 AM | #27 | ||
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Some folks are seeing a bit of cylinder deformation at big (800WHP) power but short of that, things like cylinder walk (which tend to kill most open decks) have been purely speculation. It's tremendous design. Quote:
The 54 has a forged crank and forged rods. Cast pistons. The pistons and rings tend to be what let go first.
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05-03-2016, 11:40 AM | #28 | |
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It's a very, very impressive car. But I don't believe it's all that impressive a motor relative to the 54; some iterative improvements (AtW intercooler, valvetronic)
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05-03-2016, 12:11 PM | #29 |
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I get a kick out of N54 guys, circle jerking it's superiority, and making excuses for otherwise. On the street 500 + whp is fast, regardless of how you get there. For real power, go with an LSx.
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05-03-2016, 12:15 PM | #30 | |
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If I wanted an LS i'd get an LS. Asinine comparison.
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05-03-2016, 02:47 PM | #31 |
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135Pats nailed it. The B58 is better at being cheap to produce though, so BMW wins there, and it's a nice little motor. I'd probably prefer it over the N55. But comparison to the technological showpiece that was the N54 is a nah. N54 has plenty room for improvement but from the piezo injectors (not solenoid) to the application specific design of the motor being over engineered (vs a modular design mantra) to the fully electric coolant system, BMW went backwards in design moving forward with the B series.
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05-03-2016, 03:08 PM | #32 | |
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Almost everything annoying or 'wrong' with the N54 has to do with peripheral hardware or tuning issues; the motor itself is outstanding.
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05-03-2016, 03:30 PM | #33 | |
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N54 pistons are not forged. They're hypereutectic Pistons by Mahle. Only thing forged is the crank and I believe the rods. And for all you saying S55 is not as great... S55 is in low 10's in less than 2 years. How long did it take for the N54 to do that again? S55 already has two built motors. 800whp is going to be a joke not to mention 900+ |
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05-03-2016, 05:01 PM | #34 | |
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05-03-2016, 05:33 PM | #35 | |
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They're grotesquely expensive which is a separate matter. But nothing beats piezoelectric. I wouldn't put forth the cooling system as a strength of any modern BMW. They all stink if we're being honest
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05-03-2016, 05:45 PM | #36 | |
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Similarly the electric cooling system allows for so much control and versatility. You can run the coolant pump output on demand without a thermostat, so it's much more efficient, and you can run it when the motor is off to cool the turbos once oil drains and to more evenly cool the block. Reliability, capacity, and cost, again not ideal, but that's not what I was referring to. B58 is a much cheaper design, in part for reliability, but with modern BMW designs I feel they are more interested in bottom line and in-warranty repairs, so don't expect the more traditional hardware to last significantly longer. Last edited by V8bait; 05-03-2016 at 05:53 PM.. |
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05-03-2016, 06:26 PM | #37 | |
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That being said, I don't consider the injectors to be part of the engine when I say it's a great engine. To quote my friend on the subject, the N54 is a much better engine than the N55, it's just that everything bolted to it is worse. |
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05-03-2016, 10:00 PM | #38 | |
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05-03-2016, 10:05 PM | #39 | |
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05-03-2016, 10:40 PM | #40 |
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i guess the term 'use it or lose it' applies here
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05-04-2016, 02:10 AM | #41 |
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The water pump is definitely running more than half the time. Also, it's not like they have an expiration date. Some fail and some don't. On one car I've got 100,000 miles with no issue, on the other the pump just failed at 90,000.
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05-04-2016, 09:13 AM | #42 | |
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Just to be clear, for a stock motor there's no question i'd prefer an S55. All day. I had thought this was specifically in the context of maximum performance and potential.
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05-04-2016, 10:19 AM | #43 |
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My waterpump died at 93,000 and i was surprised how long it lasted. The waterpump was fairly cheap (compared to say a Lexus) and it was pretty easy to replace and I have xDrive. Also at 93,000 this engine runs like its brand new.
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05-04-2016, 11:50 AM | #44 | |
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Like yours, mine failed around 90k miles and it's the only car I've owned that has lost one that early. |
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