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Sedans Ultimate AWD Sports Sedans
820 messages, Last post on Jun 02, 2009 at 7:45 PM
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Replying to: investor27 (Jan 12, 2009 12:47 pm) 1) Many things that may be true for the TDI generally have zero bearing on other cars, turbocharged or not. 2) Colder air allows for increased performance due to the fact that the colder the charge, the denser it is (i.e. more oxygen molecules per given volume, allowing for a commensurate increase in the amount of fuel injected into it -- this is more of a factor with normally aspirated engines), AND the cooler the intake charge, the high the boost can be and/or the further advanced the ignition and valve timing can be before reaching the point of insipient detonation. Best regards, Shipo |
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Replying to: investor27 (Jan 12, 2009 10:39 am) On the other hand, Green Bay is a place where only truly die-hard Packer cheese-heads live! I don't have any doubt at all that the 335xi will perform very well in the cold. I do suggest following BMW's recommendation about top tier gas (Shell, Sunoco, etc. Your dealer can give you a list). Also, check out the right oil. I use Castrol Synthetic 5W-30. That should work for you but check with a knowledgeable mechanic. I used to think everyone should drive a 335xi, but if that were true, I wouldn't be able to blow by other cars so easily! Go for it. I'm sure you won't regret it. I would strongly suggest a block heater, though. I used one for many years in Montreal, and it was an engine saver. xeye
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Replying to: shipo (Jan 12, 2009 11:14 am) I'm amazed that I can offer something that I'm sure you already know. It's the same reason you get lousy mileage on the same trips in the winter as the summer. The colder air is denser and the engine knows this. It appropriately injects more fuel to balance the density of air. It may produce more power, but I don't know the physics and chemistry of the equation. (College was a long time ago.) Even though the intake may be intercooled (I wasn't aware of this), it's starting with much colder air. It depends on how the intercooler determines when it's job is done. If you have more information on this, I'd appreciate your input. xeye
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Replying to: xeye (Jan 12, 2009 4:50 pm) Please be advised that Castrol Syntec 5W-30 DOES NOT meet the necessary oil specifications required for any BMW built since at least the late 1990s. Running that oil is a recipe for a sludged engine and a refusal from your dealership/BMW for warranty repairs if/when the engine fails. The only Castrol Syntec that meets the BMW LongLife-98 and LongLife-01 oil specifications (equired for every gasoline powered BMW sold this decade is Syntec 0W-30. That said, you can buy a Castrol produced oil under the BMW label from your dealership that is in fact a 5W-30, but make no mistake, that is NOT the same oil as is in the Castrol Syntec 5W-30 bottle. For all who buy their own oil, the only two generally available LL-01 oils sold here in the U.S. are Mobil 1 0W-40 and Castrol Syntec 0W-30. Best regards, Shipo |
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Replying to: xeye (Jan 12, 2009 4:59 pm) The most common reason why engines deliver lower fuel economy in the winter is that fuel doesn't as easily vaporize in a very cold intake charge as it does in a warm or hot intake charge, and as such, the engine needs to run a tad richer to make sure the burn inside the cylinders is properly controlled. That said, depending upon how the intake is setup, turbocharged engines have the ability to negate the cold air/poor vaporization thing by relying on the warming effect the turbocharger(s) create by compressing the intake charge. Back in the 1980s I had a non-intercooled turbocharged car that actually got better fuel economy on the highway in the winter months, in fact, the best mileage it ever got was driving across Nebraska at something like ten degrees below zero. The question here is, "Does the 335i bypass the intercooler when the intake charge is cold and the engine is being operated at partial throttle?" Answer: I don't know for sure, but I kind of doubt it, that would be a lot of plumbing. Taken from a different perspective, Audi, with its FSI style engines that inject the fuel directly into the hot combustion chamber, is now producing cars that vary little winter vs. summer with regards to fuel economy. Best regards, Shipo
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Replying to: investor27 (Jan 12, 2009 12:47 pm) |
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Replying to: shipo (Jan 12, 2009 5:21 pm) AFAIK Krzys
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Replying to: krzyss (Jan 13, 2009 1:34 pm) Anybody with more recent information? Best regards, Shipo
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Replying to: shipo (Jan 13, 2009 1:48 pm) At first it varied by the time of year, but now we use E10 year-round. No change in the formula seasonally any more. |
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I have 2 2006 mazda 6's ,a 2.3 i4 gt and a gt speed6.The fuel mileage difference between the 2 --- summer vs winter is about the same. Its 2 miles per gallon better in the summer. I watch mileage very carefully . This is real would driving . The biggest difference I have found is between gas brands ----- I know you wouldnt think so. I have found Shell to be the most inconsistent , sometimes 3 miles to the gallon less --- remember 2 cars , same conditions , same drivers and accurate calculations. Political concerns aside , Citgo is the most consistent. So turbo vs non turbo , 2 very similar cars (for this test) , the turbo still uses a little more gas in cold weather as does the non turbo. Buy the way both cars are great. thanks . I hope this offers some clarity to the subject.
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