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Why BMW needs turbo for E54 engine to acheive 306hp?
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02-17-2006, 10:24 PM | #23 | |
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02-18-2006, 04:22 AM | #25 | |
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The 335si (with 330HP) also trashed new Audi S4. FYI. |
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02-18-2006, 04:24 AM | #26 |
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The 306 Hp is only a guidance from BMW. Once you put a decent chip or do a ECU flash upgrade, we'll see numbers around 380 HP and 380 lb-ft. And all without sacrificing any reliability, at a cost around $100.
Then it's bye bye Lexus...
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02-18-2006, 05:10 AM | #27 | |
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02-18-2006, 05:49 AM | #28 | |
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02-18-2006, 05:54 AM | #29 | |
missing two turbos.
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02-18-2006, 06:19 AM | #30 | |
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02-18-2006, 06:25 AM | #31 | |
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02-18-2006, 06:28 AM | #32 | |
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02-18-2006, 07:51 AM | #34 | |
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02-18-2006, 08:04 AM | #35 |
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Turbo (x2) is a stupid stupid idea for only 300HP. Even Audi abandonned it. They just had to throw in the "old tech" M3 engine and they would got... 333HP. In the end, these double-turbo engines takes as much fuel as larger engines and they would have been better with a larger displacement at the beginning. I owned 2 turbo cars. Harder to resell at high mileage, too.
Crazy move from BMW. |
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02-18-2006, 08:11 AM | #36 | |
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02-18-2006, 08:21 AM | #37 | |
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Is the drop in fuel economy due to effeciency losses of having two turbines instead of one. Turbos engines are supposed to be more effecient than NA engines due to its ability to reuse some of the ~30% of fuel we waste in our exhaust. I can see if you chip it to get 400+HP and use it constantly, you would burn some extra fuel. |
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02-18-2006, 09:07 AM | #39 | |
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02-18-2006, 09:59 AM | #40 | |
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A well tuned bi-turbo setup delivers: -Excellent torque -Excellent power curve (note the 1500-5800 rpm torque plateau - talk about awesome highway performance/passing and in-gear acceleration) -Better fuel economy under partial throttle (which is how most driving is done, of course) -Lighter block weight (important for balancing the car's chassis - the 4 liter V8 used in the 540i, for example, is 70 kg heavier than the N54) Forced induction essentially provides all the advantages of a larger naturally aspirated engine with fewer of the disadvantages (particularly in terms of day to day fuel economy). We will likely see this engine, at 3.0L with HPI, getting better than 30 mpg on the highway. Lexus' DI 3.5 rates at 28 (despite a six speed trans and very conservative - judging by how it behaved when I drove it - transmission behavior), and the BMW non-DI N52 3.0 is currently rated at 30. Cost and reliability depend upon the setup and are impossible to determine from this side of things. I don't know about you, but I love the torquey nature of the M52TU in my E46. I love being able to pass in 5th gear on the freeway with a lowly 2.5 liter engine. The low and mid range torque in the older BMW I6 engines was always a big selling point for me...this engine restores my faith in that ideal. |
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02-18-2006, 10:03 AM | #41 | |
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Anybody who thinks the S54 would make an appropriate engine for a fairly mainstream sedan clearly hasn't driven an S54 powered car, and/or doesn't understand the mechanical limitations of the engine. |
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02-18-2006, 10:17 AM | #42 |
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There is a reason why BMW compares the:
4.0 liter V8(306hp / 287lbft) introduced last Sept. used in the 540i. 3.0 liter I6(306hp / 295lbft) to be used in the AG 335. Anybody see the connection ? |
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02-18-2006, 10:36 AM | #43 |
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Having a bmw turbo petrol engine in the NA market is an excellent thing.
I`m not afraid about the long term reliability....just look at the turbodiesel engines in Europe I prefer a 3.0L turbo over a 3.5L NA because of the torque and the feeling it gives you at low rpm when I compare my 325i to a 1.8Turbo VW GTI I have to say that the GTI feels faster AT LOW REV (under 3500rpm) It gives you an impressive sensation of acceleration and an immediate response (which might be too brutal for some people but not for me) The only thing we need to know at that point is.....the price of this baby If they just move from 330i to 335i at the same price this car will kill the competition......but I highly doubt they will just drop the 330i......I thing 335i will cost much more than 330i Last edited by ssam; 02-18-2006 at 05:03 PM.. |
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02-18-2006, 11:52 AM | #44 | |
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