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BMW 3-Series (E90 E92) Forum
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Turbo specs
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12-26-2011, 06:33 AM | #45 |
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Stupid iphone app was showing an error and i tried to post and showed the error again but apparently it posted!!!
Sorry for the "spam"
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12-27-2011, 08:07 AM | #47 |
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Care to educate us on why Twin-Scroll turbos aren't designed for big power up top?
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12-28-2011, 12:45 AM | #49 | ||
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Quote:
http://www.full-race.com/articles/efrturbotechbrief.pdf But this is the section about twin vs single Quote:
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12-28-2011, 12:50 AM | #50 |
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I'll check it out.
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12-28-2011, 09:45 AM | #51 | |
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Quote:
That makes sense. Thanks for linking. |
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12-28-2011, 11:04 AM | #52 |
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I m certinly not an engineer or an expert of any kind but, newer turbo-technology ie ultra strong and light turbine wheels and super efficient compressor wheels will change how consumers view twinscroll vs single turbos in the future. Again, I am not an expert but I, like the rest of you have read my socks off trying to understand why one MAY be better than the other. Once Full-Race becomes more active in the BMW community, Geoff will certainly add his vast knowledge here and educate us all a bit more.
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12-28-2011, 11:08 AM | #53 |
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OP good luck and keep us posted as you make progress
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12-28-2011, 05:37 PM | #54 |
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I am currently trying to convince Geoff to be a vendor on the forums. That way he can officially come and speak for himself. I don't want to offend the mods myself and I know Geoff doesn't either.
on the topic of twin scroll BMW has moved to it. I believe ford has as well, Mitsubishi has used them for a long time. maybe we should just use a turbo like what comes on the newer ford with dual compressor wheels lol. but from all I have read twin scroll is all about wide power band. not an ultimate power turbo. |
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12-28-2011, 06:50 PM | #55 |
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Thanks for the good read! My take is to size the turbo large enough to hit the top end that you want. Being twin scroll doesn't mean you can't make serious power up top while spooling up quick down low. Like the article said... Best of both worlds
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12-29-2011, 09:04 PM | #56 |
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You are correct in saying that the advantage of the Twin Scroll is you can use the opposing pulses to spool a bigger compressor faster. The problem with turbo sizing is that you can move massive air very fast on the compressor side but then cork the whole system up on the exhaust side. The concept of the twin scroll is too speed up the spool yet still allow big enough wheels to get the exhaust out. That is one of the reasons that I believe BMW switched to a twin scroll. The previous twins allowed more air. I have reasoned that the BMW doesn't really care about massive power at the top end. They made this car to have x amount of power and what they engineered does this. The other problem that the manufacture has is modded cars switched back to claim warranty. So if you limit the amount of air that can flow through the engine by limiting the size of the turbo you also limit the aftermarket from pushing the engine beyond its limits.
To go beyond these limits you have to mod the car enough that a warranty void is going to be obvious. The stock crank is rumored to be cast not forged so using the turbo as a cork seems like a good limiter to me. I wonder how many true performance minded individuals who are on this forum are actually willing to completely void the stock warranty and will actually do it knowing they have no warranty and not try and trick the dealer to get service when they have problems. I havn't owned a new car in 10 years that hasn't had the warranty voided by 1500 kms. This car will be no exception. When something breaks and I do mean when I replace it with something stronger. So to sum this up without a mass amount of people willing to void warranties seeing new big single options are not worth the aftermarket developing. I don't think that I will be using a JB4 on my car as I want full control and the only way I see that is with complete ECU re-flash. So that will be what holds me up but we will see what happens ECU wise shortly. Cheers Bo J |
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01-02-2012, 08:56 PM | #58 |
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just curious, im not that educated in turbos but I know little things here and there. I am in the market for a 335 but getting a bit worried if i want to go with the n54 or n55.
Lets just say a 335 with the n55 engine having a charge pipe, intercooler, downpipes, intake, meth, no cats but a good muffler, and a ecu tune. What numbers are expected (generally ofcourse) and what boost can you put out from the turbo. Will it break the crank shaft? |
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01-03-2012, 12:02 AM | #59 |
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Can anyone actually verify( not I read I heard) but has actually seen a crank break. See I would be skeptical of that being that the engine is an Inline 6. Cast crnks were used for years yes not as good as forged but they have their advantages as well. If you have seen one lets get some pictures and what actually caused the crank to break.
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01-03-2012, 11:19 AM | #60 | |
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02-27-2013, 03:39 PM | #61 | |
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Is it updated in the F30? i'm trying to sort out whether an FMIC is worth the cost or not...
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03-11-2013, 12:26 AM | #62 |
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OP whats the need for all that power damn ahah
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03-11-2013, 08:28 PM | #63 |
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Wow 16 months old post... N55 turbo R&D just got some time in the sun since stage 2 turbo upgrades for n54 have been completed...
N55 turbo upgrade won't be a reality for at least 18 more months... Too expensive and low level of support from builders... |
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