N55 Max Boost Stock Turbo Summary BMW’s N55 engine is capable of excellent performance straight out of the factory. With a reliable twin-scroll turbo, the N55 is capable of making up to roughly 25-26psi. However, for reliability and longevity reasons, we recommend limiting boost to about 20-21psi.
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How can I get more power out of my N55?
Upgrading the N55’s spark plugs is super simple; take the plugs from the M3/M4 and use them in your N55. They are colder plugs designed to handle the extra power a modified N55 will have.
How much horsepower can a N55 make?
The N55 can handle around 550whp and 550wtq on the stock engine block and internals.
How much boost can a stock N55 handle?
HOW MUCH POWER CAN THE STOCK N55 MAKE? From the factory, according to BMW, the N55 Inline-6, twin scroll single turbo motor produces 306 HP/ and 295Ft-Lbs. Like most BMW’s, we expect these numbers to be underrated, and we set out to find just how much power it will make.
How long do N55 turbos last?
You also can’t run 100% E85 even with a LPFP upgrade on an N55. There is no reason to run E50, you can’t use the octane anyway as the stock turbo is too small.
How much HP does a Stage 1 tune add 335i?
How long will a BMW N55 engine last? The BMW N55 motor should have no problem lasting over 150,000 miles, and some owners report getting over 250,000 miles out of their engines.
How much HP does downpipe add N55?
On the Stage 1 map, that increased to 345 ft lbs of torque, and 284 hp, which is a lot for just a re-flash of the ECU. It is worth mentioning that those results were on the Cobb 93 octane map, but we were running 91 octane in the car because that is the highest octane rating that we have access to here in Colorado.
Is the N55 reliable TO TUNE?
Summary on N55 Downpipes Catless downpipes are the least restrictive and offer the most performance benefit, at approx. 25whp for tuned vehicles.
How much HP does a Stage 2 BMW N55 have?
On just a tune, or a DP/intake/tune, there are no reliability issues with the N55. It’s completely solid even on larger turbos.
Why does the N55 say twin turbo?
Expected horsepower for the N55 MHD stage 2 tune comes in around 310-340whp. Boost targets are beginning to become aggressive enough to the point ACN91 falls behind normal 91 octane. With all of the recommended supporting mods on 93+ octane boost targets will likely run up to the ballpark of 16-17psi.
Why is the N55 so good?
It has two separate turbos, each powered by 3 of the engines six cylinders. Both of the turbos on the N54 are of equal size and configuration. The BMW N55 TwinPower turbo is a single Turbo engine with two separate exhaust runners powering the hot side of the turbo.
How long do N55 coils last?
The N55 twin-scroll turbo offers slightly faster turbo spool and delivers peak torque 100 RPM’s sooner than the N54; a characteristic that is not noticeable as each turbo set up spools quickly and delivers impressive torque through-out the low end and midrange.
Is N55 forged?
We recommend the following N55 ignition coil intervals: Stock – 60,000-70,000 miles. Modded – 30,000-40,000 miles.
Can you make a N55 twin turbo?
Starting from the block and rotating assembly, BMW gave the N55 a forged crankshaft, forged connecting rods and newer piston rings.
How much HP does switching to E85 add?
alpina B3/B3S was using N55+twin turbo setup. Yup, and the whole motor is build. So to OP, yes it can be done.
Can you tune a N55 engine?
E85 fuel has a faster ignition time and flame propagation when compared to gasoline. This leads to higher cylinder pressure, as well as increased engine torque and power, gaining up to 20%. The increased exhaust gas flow allows turbos to spool quicker.
Does N55 have secondary cats?
N55 Horsepower Overall, BMW’s N55 is a tuner-friendly engine capable of making, on the stock turbo, plenty of power to satisfy a majority of enthusiasts, all while remaining reliable and driveable in all conditions.
How often should you change spark plugs N55?
Correct; the N55 has no secondary cats.
How long do N55 injectors last?
In most modern BMWs, manufactured after 2010 with the N20 or N55 engines, it is required to change spark plugs every 60,000 miles. For BMWs with V8, V10, or N54 or N63 engines, 37000 miles are the threshold before getting new spark plugs.
How much HP does a Stage 2 kit add?
The injectors in the N55’s usually last well over 200K miles.
How much HP can a stock 335i make?
The Stage 2 upgrade delivers up to 30% more horsepower and 10% more torque.
How much HP does a downpipe add to a 335i?
The 335i with stock turbos is capable of making upwards and beyond 500 horsepower at the crank. However, the N54 vs N55 is an important subject here. BMW N54 engines with factory twin turbos are generally more capable. The N54 can make upwards of 500whp on stock turbos while the N55 maxes out around 425whp.
Is a high-flow cat worth it?
N54 Catless Downpipes Performance Benefits OK fine, I will move on to why I believe catless downpipes are one of the best mods for the n54 powered 135i 335i and 535i: +15-25 Horsepower and Torque.
Can you be Stage 1 downpipe?
A high-flow cat is ideal if your vehicle is heavily modified or turbocharged since the extra airflow can help in adding more power. A high-flow catalytic converter is better than a normal cat. It increases horsepower, minimizes toxic gasses from your car, and roars a car’s engine with a great tune.
Are BMW downpipes worth it?
You can certainly install a downpipe on a stage 1 tune but as the above mentioned you will have a check engine light as stage 1 does not clear it for downpipes. You need a JB4 to have the check engine light cleared for downpipes.