At the same time variable valve lift system Valvetronic III appeared. 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. It was used for BMW models with 35i index.2. 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. Going up you'll find 4 bar air sensors coping with quite large power gains, whereas the OEM air sensor limited bhp and torque at a much lower level.Adding a supercharger or additional turbo will make large bhp and torque gains, although more complex to install. All you need is to replace them to make motor operate properly.In addition the problem with high pressure fuel pump (HPFP), still exists in N55 engines. Past that, both engines need aftermarket forged bottom end internals to survive.Both engines are very similar in many aspects and stock-for-stock perform nearly identical. My waterpump went out at 42k -- crazy since my n52 is still on the OEM waterpump at 85k miles. Such turbocharger is able to provide engine with a boost much earlier as well as provide it with maximum of rpm starting from 1,200 rpm. Note that costs will be higher for obtaining 450 HP engine. Diameter of inlet valves is 32mm, exhaust valves are 28 mm in diameter. Misfire. Reliability is arguably the most important things to look for in an engine, and unfortunately, the N54 has horrible reliability.As we’ve discussed in previous articles, the N54 has tons of problems with fuel injectors, high-pressure fuel pumps, electronic water pump failure, and other common problems.It should be noted the N55 isn’t perfect, but BMW did fix many of the issues the N54. The combination of power to reliability on the S55 is astounding and unrivaled by any other BMW engine. Injectors are a new design, the hpfp is the same but is at least a later revision part number, the oil pickup was redesigned to reduce starvation issues and frothing, blowby ports were added to the head to prevent carbon accumulation on the valves, and coolant passages were revised to have greater control over cylinder head temperature and keep important things like the injectors cool. Water pump and wastegate actuator sensor failed coolant res also.
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