09-01-2010, 02:46 AM | #45 |
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I think people are avoiding this very idea because they're hoping the engine will be a little more special than what's offered in the 335is. To admit this fact is to accept the car will be less special than many of us initially hoped for. I for one remain hopeful that M engineers at least improve the turbos to prevent the engine from running out of breath beyond 5500 rpm.
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09-01-2010, 03:46 AM | #47 |
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In fact, the Z4 35is produces 340hp all the time, only the torque is higher in overboost mode. And if you read the threads there, most people seem to agree that the Z4 35is engine will be the one in the 1M providing the 1M will use an N54 variant.
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09-01-2010, 03:58 AM | #48 | |
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09-01-2010, 05:29 AM | #49 |
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09-01-2010, 06:35 AM | #50 | |
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As the cat converter in both the N55 and the S63 are incorporated with the twinscroll, the indication that it had cats in the midpipes tells us it is likely to have a N54 tubo setup - ie twin turbo and not twinscroll twin turbo or twinscroll. So, what else has M got at the moment apart from twinscroll twin turbo? One thing that no one has mentioned is the CCM - cylinder-bank comprehensive manifold - which may be incorporated with the twin turbos. However, I don't know if it requires twinscroll for it to work as there's no detail of this technology. As the N55 was an issue with valtronic - I guess the other logical choice of what ///M has was the S54 plant that was deemed too heavy. Is it possible that they have built a new S54 block as an aluminium block and mate it with the turbos? That would confirm why some early reports that the 1M is going to be powered by the S54 as it was actually tested with the S54. Or is it going to be a N54 with CCM incorporated? Who knows, but after reading this again, especially when scott said it's not a straight forward transplant which means that it is definitely not just a N54 with better cooling because it's already available as a power kit. My hopes is up again .
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09-01-2010, 07:37 AM | #52 |
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whats gonna be crazy is that this 1M is gonna use regular BMW oil instead of M oil. I'm used to saying can I have some M oil at the dealership, I wonder if this is gonna cause confusion.
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09-01-2010, 07:55 AM | #53 | |
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We can only speculate from the rough info we have. |
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09-01-2010, 08:49 AM | #55 | |
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09-01-2010, 09:47 AM | #56 |
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+1.
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09-02-2010, 02:33 AM | #57 | |
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BMW would scrap the project before they put out an inferior M product. They are trying to use this car as a way to introduce the M brand to a new audience and M knows they would hurt the M brand for these new buyers if the motor was not a M quality engine. I can see where development of the new M3 motor was not ready yet and M has done something special with the N54. |
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09-02-2010, 02:49 AM | #58 |
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Actually it is possible but not in a traditional way. I do not think this is what they are doing as it is pretty different from how the have used these technologies so far.
What you can do is use exhaust manifolds like is on the N54. They have cylinders 1-3 into one manifold and cylinders 4-6 in another. If you look at the firing order you get good exhaust gas pulse integration. The pulses do not interfere. You would then use 1 twinscroll turbo on each manifold. You would use only one of the scrolls at low rpm and bring the other scroll in at higher rpm in a sequential maner. The scrolls can even have different AR ratios. My 1987 Rx-7 twin turbo used a set up like this. This is a good idea as you can get great low speed rpm response with out loosing the top end. I thought this might be what they were doing for the 1M and next M3. Maybe they are using this or whatever turbo setup is coming on the next M3 on an N54? That would be a "hybrid" as Scott mentioned of the two engines and would eliminate the N55 valvetronic problems? Hmmmm |
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09-02-2010, 02:57 AM | #59 | |
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Hopefully that will mean ECU tuners will pay some more attention to the 35is engines... |
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09-02-2010, 03:45 AM | #60 | |
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Best case scenario is a 3300 lb car with 360 hp which yields a power to weight ratio of 241 hp per metric ton (9.17 lbs/hp). Most likely scenario is a 3400 lb car with 340 hp yielding a ratio of 221 hp per metric ton (10 lbs/hp). Worst case scenario is a 3500 lb car with 340 hp yielding 214 hp per metric ton (10.3 lbs/hp). For referrence: e46 M3 = 216 hp/ton (10.2 lbs/hp) e92 M3 = 247 hp/ton (8.94 lbs/hp) e86 Z4 M = 231 hp/ton (9.54 lbs/hp) 135 tuned to 380 hp = 246 hp/ton (8.95 lbs/hp) Of course power to weight is a little misleading. For a given ratio, a lighter car will handle and brake better. Not to mention feel much more tossable. |
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09-02-2010, 03:56 AM | #61 | |
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The idea is to separate the exhaust pulses that affect each other. Three cylinders to each turbo, 2 to one scroll and 1 to another where the 2 cylinders which doesn't affect each other as much in terms of firing sequence will go to the same scroll. You just need to have the paths optimised to that setup. It is quite academic anyway, as I believe it is no longer setup that way although it might have been the valtronic giving them issues to put that setup on.
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09-02-2010, 04:04 AM | #62 | ||
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09-02-2010, 06:21 AM | #63 | |
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09-02-2010, 07:12 AM | #64 |
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09-02-2010, 07:40 AM | #65 |
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I wonder what are they gonna call it (engine)...It should start with an S.
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09-02-2010, 10:28 AM | #66 | |
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