Quote:
Originally Posted by bawareca
I will agree with josiahg52 on all his points, and especially the "fact" that the engine feels and runs better when warmed-up and loaded properly. Just as analogy, many of the problems with the N63 engine are considered to happen because the engine was never broken-in properly. It has so much usable power down low that hardly any regular owner will get to the high load cells of the map for more than a few seconds. Thus, the piston rings may never seat properly, and generally, engine that runs mostly on low and mid-load deteroriates quicker than one that is loaded properly. This is true especially for the diesel, considering that the EGR is closed at the higher load conditions. M57 is way overpowered for the 3 series, and i dont think that the engine can be loaded properly at all. Even on my X5 i dont feel the engine is loaded good in a daily use, even more so the [stupid] transmission likes to downshift for no apparent reason. IMHO the only time the engine is really loaded for a substantial amount of time is when towing, going uphill.
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haha, I floor my D all the time (pretty much every-time I drive it)! Depends on your driving conditions and style I suppose (mine is tuned). Some would say the average 3 driver is going to drive more aggressively than an X5 driver, because of the more sporting nature of the car and personality of a 3 driver. I dunno, I've drive my D with the cruise on at a constant 100-125mph for hundreds of miles at a stretch on cross country drives through west Texas, new mexico, Wyoming, okay western states. (its easy to cruise at 100mph on i-10 in west Texas, the speed limit is 80mph). I suppose its really not running a car hard that was designed to cruise at 155. But it does pull 2650rpms at 100.
Agreed the N63 has its problems. I would also agree most SUV drivers don'r run their engines hard (though I have and do floor my X5 M too). It matches my observation that the left lane on interstates is frequently clogged with SUV's who won't pass someone for miles (they won't give it some gas). No offense but its become the lane where people can hang out and drive on what I call brain dead (texting, reading, not caring). I won't speculate if running the N63 hard is the cause of its ring seating problems... Subaru's have problems with rings not getting bedded properly as well and do have other manufactures (problem on mid 2000 camrys). So its not a uniquely BMW thing. Also the engines for the most part are broken in at the factory and not left to the consumer to do (too much warranty cost risk). Which makes me lean towards a bad design.
03-29-2017, 03:22 PM
) and the MPG shows between 15 and 20 mpg, which is low to medium load. The 335D will be even more unloaded because of the better aerodynamic. Towing 5000lbs, plus the X's 5000lbs, uphill is what I call this engine really doing work. Hustling it through the city is even worse because the [stupid] transmission will keep it at high RPM and it will load the engine (full boost) somewhere after 60-70mph.
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