How do I know if my HPFP is bad N54?


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BMW N54 HPFP Failure Symptoms: Long crank time (slow engine start) Check engine light illuminated. Car enters limp mode, and runs poorly with decreased power.

How much boost can N54 handle?

Likewise, newer OEM turbos may decide to give out before 20psi. However, if you are concerned about N54 turbo longevity, somewhere in the ballpark of 17-18psi on stock inlets/outlets and 19-20psi on upgraded should be safe for most.

How many miles do N54 turbos last?

Turbochargers on the BMW N54, for the most part, last around 100,000 miles before they have to be rebuilt or replaced. It isn’t uncommon to hear of cars that have the original turbos still functioning as designed upward of 200,000 miles.

Does the N54 have two turbos?

The N54 has two small low-pressure turbochargers to minimise turbo lag.

How much HP can a stock N54 handle?

The N54 can handle around 600-650whp and 550-600wtq on the stock block and internals.

Are N54 internals forged?

Mahle Motorsports N54 pistons are forged for strength, light weight, and low drag to be a modest upgrade over the stock BMW pistons. Factory BMW pistons are cast aluminum, which is fine for the intended power output and durability.

What year 335i is most reliable?

Reliable BMW 335i Model Years Here’s a quick list of the most reliable BMW 335i years: 2010. 2012. 2015.

How do you diagnose failing HPFP?

  1. Delayed start of the engine.
  2. Hesitation or sputtering in acceleration between 2000 RPM to 4000 RPM.
  3. High engine temperatures.
  4. Vehicle stalling due to exertion or temperature.
  5. Fuel pressure gauge reading low measurements.
  6. Poor gas mileage.

Why do N54 injectors fail?

The N54 injectors are notorious for having issues but the main problem that causes them to go bad is they will start to leak. But misfires arnt only caused by bad injector. Misfires are from lack of spark or fuel. So if you just had your injectors replaced i would check your plugs and coils first.

How much does it cost to replace a turbo on a BMW?

The average cost for a BMW 328i turbocharger assembly replacement is between $3,477 and $3,673. Labor costs are estimated between $726 and $916 while parts are priced between $2,751 and $2,757.

Why do BMW turbos fail?

The main cause of turbocharger failure is oil-related โ€“ usually due to either lack of oil or dirty oil. Turbocharger failures in BMWs seems to be caused by the long oil service intervals. (The dealer typically recommends oil changes every 12,000-18,000 miles, depending upon when the car’s indicator says to do it.)

Is the N55 more reliable than N54?

Thanks to the N54’s twin turbos and forged internals, it is the more capable engine mod-for-mod. However, the N55 has proven to be the more reliable engine. N54’s are notorious for their common problems, especially early on, but these issues are currently resolved.

How can I make my N54 reliable?

Regular fluid changes. Downpipes Intake and intercooler will all make the turbos work a lot easier and more efficiently. A proper tune and besides that, you should be prepared to change spark plugs and coils if misfires occur. N54 is pretty reliable besides a few misfires on old hardware.

Is N54 twin-turbo or single turbo?

The single turbo N54 also makes less torque but manages 125 horsepower more than the twin turbo setup. On the contrary, the twin turbo setup rolls in a whopping 636 wheel-torque below 4500rpms while peak power occurs prior to 5000rpms.

Can you supercharge a N54 engine?

Yes, you can have both. It’s called twincharging.

Why is the N54 so good?

The biggest advantage of the BMW N54 is its power and potential. Sure, the twin-turbocharged petrol engine provides enough power as it is. Still, what truly makes it special is the ability to boost the output even more with a couple of aftermarket upgrades.

Is N54 fast?

Brake-boosting the AWD N54 yielded a best blistering fast time of 11.9 @ 116mph. That’s about two full seconds faster than a stock N54 335xi which typically run in the 13.8 to 14.00 second range. To say that again, TWO FULL SECONDS off the stock time, on the stock turbos, with only bolt ons and a tune.

How strong is BMW N54 engine?

The N54 is a twin-turbocharged, direct injection engine, and from the factory, it made 300HP/300TQ at only 8PSI. With a simple ECU flash/tune, you can make around 380HP and around 400lb-ft of torque. Since this motor shipped with forged internals, a few mods can reveal insane power.

How much power can a 335i auto handle?

So what i gather from this post, is that keeping a 335i auto around 400-450 whp is pretty safe for our tranny’s, if you keep it off the track and no hard launches with sticky tires…

What parts in N54 are forged?

This is because from the factory the N54 came with forged internals. While which specific parts were forged and which were cast is up for debate, it’s widely accepted that the crankshaft and rods were forged while the pistons were cast.

Is N54 a good engine?

The N54 is a very highly regarded engine, for the most part. It’s received numerous International Engine of the Year awards and had thrice won the Ward’s 10 Best Engine Award. From an enthusiast standpoint, there are few engines today that can offer a similar return on the dollar in terms of modifications.

What is the difference between 335i and 335is?

The 335is includes tuned sports software not standard on the 335i and M kit. The 335is gets 320 hp and 332 lb-ft torque from the twin-turbo 3.0-liter inline-six engine, and an overboost function allows for seven-second blasts of 370 lb-ft of torque. Compared to the standard 335i with 300/300.

How unreliable is a 335i?

BMW’s average rating for reliability across all models is just 2.5/5. The BMW 335i earns a mere 2/5 for reliability.

Is BMW 335i expensive to maintain?

The annual maintenance cost of a BMW 335i is $1,030. Repair and maintenance costs vary depending on age, mileage, location and shop.

How do I know if my BMW fuel pump is bad?

  1. High Engine Temperature.
  2. Stalling at High Temperatures.
  3. Decrease in Gas Mileage.
  4. Engine Sputtering.
  5. Surging.
  6. Noisy Pump.
  7. Lower Engine Power.
  8. Problems Starting.

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