The N55 is a better more reliable engine than the N54 was. The 8 Most Common BMW N54 135i, 335i, 535i Engine Problems.
... BMW N54 VS N55 Engines!
I unnecessarily replaced the VC gasket since it was replaced with the VANOS bolt recall. Hope this helps!
the M50/52/54 are a walk in the park to … We've seen guys spending a lot of money on turbo upgrades on the only to have the whole thing go up in smoke soon after it's been completed.Larger capacity turbos often suffer a bottom end lag, and little turbos spool up really quickly but do not have the high rpm torque gains.Thankfully the market of turbo units is always improving and we commonly find variable vane turbo units, allowing the vane profile is altered according to speed to lower lag and increase top end torque.Twin scroll turbo units divert the exhaust flow into two channels and direct these at differently angled vanes in the turbocharger. Change oil every 5-7k miles with Liqui Moly 5w40.
There is a car here with 160k+ mi (I think?, in Canada?) 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. On occasion I have had to do the valvetronic motor, … The BMW N55 is a turbocharged straight-six petrol engine that began production in 2009.
I average over 600 miles a week (due to work). 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.
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