the last easy to work on engines BMW ever built was in the e46, e36, etc. BMW Engine Malfunction Reduced Power message comes on when the engine computer (DME module) in your car detects a problem.

Engine would start and immediately cut off. There is a car here with 160k+ mi (I think?, in Canada?) I have a May '11 build N55 with 111,150 miles. hmm what do you mean by lean? i've had 1 case of loosing engine power and getting codes for "mixture too lean" is this what you're referring to?2011 335Xi 6AT - VRSF catless DP - VRSF 7" FMIC with turbo inlet pipe - VRSF chargepipe - Pure Stage 1 turbo - JB4 - E30 - xHP Stage 3 - Strongflex tension bushings - Whiteline RSFB - UUC rear swaybar History of the N55 Engine. This inclues info from the last three oil changes. What oil are you running? The N55 was BMW's first straight-six engine to use a twin-scroll turbocharger.It also won three straight Ward's 10 Best Engines awards in 2011-2013..

im getting my JB4 today and ill prob set it to Map 5 (auto tune) + turn logging ON so i can get this information! after or before running engine. I average over 600 miles a week (due to work). We have a twinchargerYou will need to ensure that the engine is not starved of fuel so should look at the fuelling when you start extending past 20% of a bhp and torque increase.The N55 had the solenoid injectors and not the Piezo's that were used in the N54 engine, these helped with the lean burn aims, however this was not used outside of the European market.We strongly recommend you to be generous with your injectors flow rate. Choosing a higher performance camshaft profile raises the bhp accordingly.Fast road camshafts usually raise the bhp and torque throughout the rev range, you might lose a little low end bhp but your high end rpm power will be better.Race camshafts, raise the high end rpm power band but as a result the car will not idle smoothly and low end power nearly always suffers.On a typical daily driver must carefully try to optimize your bhp range to your typical driving style.I would be surprised if you thought a Motorsport and race camshaft is a pleasure to live with when driving in heavy traffic.Each engine responds better to more or less aggressive cam durations so set your engine up on a rolling road.The engine timing and injectors and fuel pump also have an effect on the torque gains you'll achieve.Extending exhaust or intake durations can alter the torque band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations.Remaps helps unlock the full potential of all the parts you've fitted to your N55.It will usually give around 30% more power on turbocharged vehicles and 15% on NASP engines, but you mileage will vary depending on the parts you've done and the condition of your engine.Pushing air into your is the whole point to any engine performance tuning task.Headers carry the air from the air cleaner and allow it to be sucked into the engine and mixed with fuel.The size of bore and shape and flow characteristics of the Headers can make a noticeable change to fuel atomisation and engine efficiency on the N55.Commonly we find the headers are begging for aftermarket tuning parts, although some car makers provide fairly well optimized headers.Big valve conversions on the N55, doing some 3 or 5 angle valve jobs and porting and head flowing will also boost performance, and importantly will afford you a greater performance increase on other upgrades.The more air to get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes massive power gains.NASP engines need quite a lot of work when you add a turbo, so we have a When a car has forced induction parts are going to make more power and you'll see that turbo charged engines already contain uprated components.However you will find an engines will have power limitsSee where you'll find these limitations and upgrade to better quality crank and pistons to cope with the power.
In the last five years, BMW, the maker of "the ultimate driving machine," has recalled about 700,000 vehicles for technical problems with the potential to cause their engines to fail. We won't know who you are personally or be able to track you after your visit to our site.See adverts offers and special deals of interest to you by allowing our trusted Google advertisers to use targeted interest based advertising cookies.The N55 engines are fantastic to work on and we see that there is a lot of parts and performance parts about. This thread was a good reminder that I've needed to do that!I'm also at 97,000 miles and I just ordered a blackstone lab kit to test my oil on the next change.

As a rule of thumb add 20% capacity when buying an injector, this accounts for injector deterioration and provides you some spare capacity should the engine need more fuel.Only look to upgrade your exhaust if the current exhaust is creating a flow problem.The N55 has a well designed exhaust manifold that helps reduce throttle lag and back pressure, working really well with the twin scroll turbo.On most factory exhausts you'll see your flow rate quite well even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust.Don't go with the widest exhaust you can buy this will slow the exhaust rate - the best for power gains are usually between 1.5 to 2.5 inches. Hope this helps! The 8 Most Common BMW N54 135i, 335i, 535i Engine Problems. Will be happy to supply feedback for anyone with questions. My buddy had a rod bearing issue in his e90 n55, 2012MY. This topic is really concerning. Also working from my tablet i had to cut down the photo size. and I'm around 147k now.

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