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02-21-2012, 05:42 PM | #1 |
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STANDARD vs SULEV
Question for the pros on here. When I ordered my car in California, I noticed a SULEV designation. Other than lower emissions, is there any other difference from the standard engine?
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02-21-2012, 05:57 PM | #2 |
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02-21-2012, 05:59 PM | #3 |
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N51 SULEV v N52
This is from the Bimmerforums:
"The N51 has a different cylinderhead with lower compression, a plastic cylinderhead cover with a different crankcase ventalation valve, a DISA intake manifold, and different cats. The performance should be nearly identical." I cannot confirm this but I also heard the DME is de-tuned compared to the N52's.
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02-21-2012, 06:03 PM | #5 |
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Found this:
Low Emission Vehicle (LEV): This is the average vehicle, the minimum that you can legally drive in California. Ultra Low Emission Vehicle (ULEV): ULEVs are described as 50% cleaner than the average new vehicle for the model year. Super Ultra Low Emission Vehicle (SULEV): SULEVs are 90% cleaner than the average new vehicle for the model year. The 328i SULEV uses the N51 versus the N52 engine. In order to comply with SULEV requirements, the N51 is a variant of the N52 engine. Some of the SULEV measures for the N51 include: • Near engine catalyst with additional underbody catalyst • Secondary air system • Optimized combustion chamber geometry in cylinder head • Modified piston crown for lower compression • Plastic valve cover with integrated crankcase vent valve and separator (from N52KP) • Stainless steel fuel lines with threaded connections • Radiator with “Prem-air” coating • Throttle system - EGAS08 carried over from N52KP • Airbox with Activated carbon filter for EVAP control • Purge system pipes are made from “optimized” plastic BMW claims there is no performance difference other than the increase in weight which adds about 30 lbs. |
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02-22-2012, 09:16 AM | #6 |
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Another difference is that if the N51 is coupled with an automatic transmission, the transmission has a N51-specific mode of operation. That is, during the engine warm-up phase, the transmission will automaticlly shift to neutral when the vehicle comes to a stop. When you release the brake pedal, the transmission shifts back into gear. This behavior reduces load on the engine when it's cold, further reducing emissions. Once the engine has sufficiently warmed up, the transmission behaves like any other automatic typically does.
Regarding the power difference, there was a N51 dyno posted on this site (or maybe it was E90post) recently and it showed that peak horsepower and torque numbers are the same, though the N51 has slightly more area under the curve in the low- to mid-range. This is undoubtedly due to the DISA 3-stage intake manifold that the N52 lacks. The trade-off is that you can feel the changeover points for the intake manifold on the N51 (though they are slight) as engine speed climbs, whereas the N52 is very linear from idle to redline. Also, it's been noted on this site not too far in the past that some of the N52s have the underbody catalysts, also. This is because there are actually two versions of the N52, LEV and ULEV, with the ULEV having the underbody cats. |
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02-22-2012, 09:28 AM | #7 |
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I had one of those SULEVs and it was fine, only problem was the cold start neutral thing... So far I've not noticed it on the 2012, but im not sure which one that car is.
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07-22-2016, 05:07 PM | #8 |
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One other difference is in the warranty. SULEV cars registered in Arizona, California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Rhode Island, or Vermont are covered by the "California Emission Control Warranty". This warranty covers emissions related parts for 15 years/150,000 miles.
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07-22-2016, 08:38 PM | #9 |
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Ah, the old SULEV discussion.
It probably won't make any difference to whomever buys one, but why would you buy a performance car that has been doctored specifically to comply with some federal regulation to allow a manufacturer to produce other vehicles? Why would you want the added complexity which produces no benefit to you as the owner? Aren't cars complicated enough without adding additional stuff to them that is of no benefit to the owner? Something else to break, perhaps something they will cover under warranty for a period, but something else to break, nonetheless. If one's concern is with the environment when it comes to buying a car, why not just put one's money where one's mouth is, and buy a Prius? |
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07-23-2016, 08:53 PM | #10 |
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And shift the majority of your pollution source to electrical power plants instead? Or the toxic heavy metals used in the batteries in electric cars which will eventually have to be disposed of when the batteries reach the end of their service life.
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07-23-2016, 10:34 PM | #11 | |
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But the undeniable fact is that a lot of people fall for this nonsense, and go out and buy themselves a Prius (or Tesla or Leaf or whatever). There is no other reason to buy a SULEV BMW, than a watered down version of why people buy Priuses. |
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07-28-2016, 03:06 PM | #12 | |
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