Will be happy to supply feedback for anyone with questions.

Car stayed at the BMW … A great straight six, silky smooth with a DOHC VVT and VVL and was the first straight six to use a twin scroll turbo charger.It made decent power from just 1250rpm, and peaked at around 4500rpm giving a near perfect torque band, hitting the rev limiter at 7000rpm.Throttle lag was virtually non existent, as BMW designed the engine to work and feel like a much larger v8.The twin scroll was fed from bands 1-3 and 4-6 and everything is managed by a Bosch MEVD 17.2 ECU.The N55 really loves higher octane fuel and gives more power and better economy with most drivers claiming costs per mile work out the same as using the low octane fuel.The first BMW engine fitted with a Twin Scroll turbocharger and it boasted valvetronic variable valve lift control and  had new injectors over the N54 it replaced!Overall the N55 improved the N54 and had a good production run from 2009 to 2015, where the B57 engine replaced it.Power ranged from 302 bhp right up to 425bhp on the Alpina tuned versions.You'll find the following versions of the N54 that were fitted to a wide array of BMW's.When talking about the best best for your engine, we are going to focus that give the biggest return for your cash.Altering your camshaft will make a dramatic difference to the engine bhp.

This inclues info from the last three oil changes. 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. The BMW N54 engine might be the best tuner engine of all time…at least we think so. 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. For your reading pleasure.

Actually issues with the n55 are fairly few. Will they cover rod bearings and engine replacements?

the M50/52/54 are a walk in the park to … The stock fuel system also runs out of juice pretty early. Overall the N55 improved the N54 and had a good production run from 2009 to 2015, where the B57 engine … Will be happy to supply feedback for anyone with questions. Engine would start and immediately cut off. What oil are you running? If my car still runs with tune, can I still get after market warranty? 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.. 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 - Duration: 9:25. This topic is really concerning. the last easy to work on engines BMW ever built was in the e46, e36, etc. Change oil every 5-7k miles with Liqui Moly 5w40.

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