The BMW N57S is the high-output, variable tri-turbo version of BMW’s N57 six-cylinder diesel family. In BMW’s 2013 7 Series specifications, the 750d xDrive uses “BMW TwinPower Turbo (Variable Tri Turbo)” and produces 280 kW (381 hp) and 740 Nm, while the 740d xDrive uses “BMW TwinPower Turbo (Variable Twin Turbo)” and produces 230 kW (313 hp) and 630 Nm. Those figures describe specific 7 Series models, not every N57 engine. The later 2016 750d/750Ld switched to four turbochargers, so it should not be confused with the N57S three-turbo system.
What the N57S triple-turbo designation means
N57 is an engine family name, not a single specification. BMW produced several versions of its six-cylinder, in-line diesel engine, with different turbocharger arrangements and outputs. The “N57S” label is commonly used for the high-output variant associated with variable tri-turbocharging. BMW’s own technical-training material presents N57 as a family with multiple variants, which is why an accurate comparison must identify the engine code, vehicle and model year rather than assume that every N57 has the same hardware.
As an Amazon Associate I earn from qualifying purchases.
In the 7 Series technical specification cited below, BMW describes the 750d xDrive’s system as BMW TwinPower Turbo (Variable Tri Turbo). “TwinPower Turbo” is BMW’s marketing and technology label; the parenthetical “Variable Tri Turbo” identifies the three-turbo arrangement in that particular specification. The 740d xDrive is listed as BMW TwinPower Turbo (Variable Twin Turbo), meaning a two-turbo arrangement.
The practical difference is therefore not simply “an N57 versus a different diesel.” It is a comparison between two applications of the N57 family, with the 750d receiving a more powerful turbocharging configuration and a higher engine specification.
#1 Best Overall
- Never Let a Dead Battery Ruin Your Drive. The LISEN 4 in 1 Retractable Car Charger delivers reliable power for your entire journey. Compatible with standard 12V cigarette lighter sockets, it keeps phones, tablets, and devices charged during daily commutes, road trips, and long drives — the perfect practical gift for dads, truck drivers, and anyone who lives on the road.
- Daily Driver Essential: Always Ready When You Need It. Featuring two retractable cables ( USB C & Old iPhone Charging Cable ) that extend up to 31.5 inches and dual USB ports, this charger solves cable clutter while charging up to 4 devices simultaneously. Ideal for busy fathers, commuters, and families who want a tidy car and never worry about low battery again.
- Deliver full-speed PD fast charging for iPhone 18 Pro Max & iPhone 18 Pro Max & iPhone 18 Pro right inside your car. The built-in 45W PD USB-C port hits the peak charging speed for these latest iPhone models, juicing up your phone to 50% power in just 15 minutes while you drive.(Note: Maximum 45W PD output is available under 24V vehicle power supply. When used with standard 12V car sockets, the peak output is limited to 36W.)
- Standard 12V Power Solution: Designed as a dedicated USB power supply for charging devices. Note: Does NOT support CarPlay, Bluetooth, or data transfer. Compatible with most phones, tablets, and small electronics. This retractable charger is a core car organization tool, keeping your vehicle tidy. Not compatible with Micro-USB devices.
- Clutter-Free Tech Organization: Featuring dual USB ports and retractable cables, the LISEN 4 in 1 charger provides a clean car storage solution. Perfect for truck enthusiasts or as a thoughtful gift for drivers, it supports fast USB-C charging for devices like the iPhone 18Pro & iPhone 18 ProMax. Keep your vehicle organized while ensuring efficient power delivery for all your tech on the road.
BMW’s N57TU Diesel Engine Technical Training Manual is useful background because it documents the family structure. It does not support treating the N57 name as one universal tune or one universal turbo layout.
BMW’s published 740d and 750d figures
The clearest apples-to-apples figures come from BMW’s 7 Series specification attachment for the 740d xDrive and 750d xDrive. Both entries are vehicle specifications, so they show how BMW rated those particular models. They do not isolate turbocharger count as the only reason for the output gap; engine calibration, airflow hardware, fueling, cooling and other application details can also differ.
| Model | BMW turbo description | Rated power | Peak torque |
|---|---|---|---|
| 740d xDrive | BMW TwinPower Turbo (Variable Twin Turbo) | 230 kW / 313 hp | 630 Nm |
| 750d xDrive | BMW TwinPower Turbo (Variable Tri Turbo) | 280 kW / 381 hp | 740 Nm |
These numbers are taken from BMW Group’s 2013 technical specification attachment, “Specifications: BMW 7 Series 730d xDrive, 740d xDrive, 750d xDrive”. The 750d is rated 50 kW (68 hp) higher than the 740d and 110 Nm higher in peak torque. Expressed as a percentage of the 740d’s rating, that is approximately 21.7% more power and 17.5% more torque, calculated from BMW’s published figures. Those calculations describe the listed models only.
Free tools Windows power users keep installed
One-click scans. No signup required.
How two and three turbochargers differ in principle
Twin-turbo diesel arrangement
A twin-turbo diesel uses two turbochargers to move and compress intake air. Depending on the engine design, the turbochargers may be arranged in parallel, sequentially or through a staged control strategy. BMW’s 740d entry calls its system “Variable Twin Turbo,” but the specification sheet does not provide a complete component-level description of how every operating stage is controlled.
Using two turbochargers gives the engine designer more airflow capacity and more control options than a single turbo. A smaller turbo can respond effectively at lower engine speeds, while a larger unit can provide the airflow required at higher load; alternatively, two similarly sized units can share the work. The exact behavior depends on the engine’s control software, exhaust routing, compressor and turbine sizing, and operating conditions. Those general engineering possibilities should not be mistaken for a claim about a specific 740d component layout unless BMW documents it for that vehicle.
Tri-turbo diesel arrangement
A tri-turbo system adds a third turbocharger and another control stage to the engine’s air-management system. In a high-output diesel such as the 750d application, that additional stage gives BMW more hardware with which to balance low-speed response, mid-range airflow and high-load capacity. The three units do not necessarily operate at identical speeds or contribute equally at every engine speed; the “variable” description indicates that the system changes its operating strategy as conditions change.
Rank #2
- High Quality Material: The coaster is made of environmentally friendly silicone, safe, non-toxic and odorless. Soft with toughness, easily embedded in the cup holder. Very durable, wear-resistant, long service life. High temperature resistance, can withstand 100 ℃ high temperature water cups.
- Wide Compatibility: The coaster has a diameter of 3.15 inches and a height of 1.18 inches, which is widely used in most vehicles, such as SUV, sedan, MPV, etc., as long as the size fits your car cup holder.
- Protection Function: Our car cup holder coaster has a carry handle design and a stand-up ring edge on its edge to effectively prevent food crumbs, drinks and water from leaking out and preventing the car cup holder from getting dirty.Meanwhile,Thickened design effectively prevents the cup holder from being scratched by the cup when driving on bumpy roads and eliminates the annoying thumping sound, making your journey more enjoyable.
- Easy to Use and Clean: With embedded installation, you just need to put it flat on the car cupholder. It is also very quick to remove, there is a small bump on the coaster, pinch it and you can easily remove the coaster. It is very easy to clean, rinse with water or wipe with a wet towel (be careful not to clean with sharp tools).
- 100% Satisfaction: Our products have quality assurance, if you have questions or are not satisfied after receiving the product, don't worry, please contact us as soon as possible, we provide after-sales service.
More turbochargers do not automatically mean three times the boost or a fixed percentage increase in power. Turbo count is one part of a complete engine system. The rated 381 hp and 740 Nm of the listed 750d result from the complete vehicle-engine calibration, not from a turbocharger count viewed in isolation.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11What “variable” tells you—and what it does not
“Variable” signals that turbocharger operation is managed across different load and speed conditions rather than remaining in one fixed mode. It does not, by itself, state whether the engine uses a particular sequence, valve arrangement or boost pressure. BMW’s public 7 Series table supplies the twin- versus tri-turbo labels and output ratings, while the technical-training manual establishes that N57 has multiple variants. Neither source provides a controlled test that attributes the entire power difference to the number of turbochargers.
How much stronger is the N57S 750d than the twin-turbo 740d?
For the two BMW 7 Series entries, the answer is straightforward:
- Power: 750d xDrive 280 kW (381 hp) versus 740d xDrive 230 kW (313 hp), a difference of 50 kW or 68 hp.
- Torque: 750d xDrive 740 Nm versus 740d xDrive 630 Nm, a difference of 110 Nm.
The 750d’s higher rating means BMW positioned it above the 740d in the model range. It does not prove that a tri-turbo N57 in every BMW vehicle will produce 381 hp, nor that every twin-turbo N57 will produce 313 hp. BMW used the same family name across multiple variants, and vehicle-specific calibration and equipment matter.
When comparing used cars, read the engine code and factory specification for the exact vehicle. A badge such as 740d or 750d identifies a model level in a particular generation; it is not a substitute for checking the production year, drivetrain and engine version.
Why the N57 family causes confusion
One family, several outputs
Engine families are developed as platforms. Manufacturers can change turbocharger count, injection calibration, emissions equipment, cooling capacity and software while retaining the family designation. Consequently, “N57” alone is not enough information to determine whether an engine is twin-turbo, tri-turbo or another configuration.
Rank #3
- ✅【Designed for Magsafe】 - The most fashionable iphone car mount in 2026 Magsafe is designed for iPhone 18 Pro Max/17/16/15/14/13/12 Pro Max Mini and official Magsafe cases and other magnetic phone cases and can be fixed directly to these phones without the need to affix metal plates. All Android Phones Will Work: Metal rings are provided; they fit cases and other phones without magsafe. Based on Unique Grandmaster Design (Protected by US Design Patent No. US D1,112,194 S)
- ✅【STRONG MAGNETIC MagSafe Car Mount】 - This powerful magnetic phone holder can create a powerful attraction that firmly supports your device while allowing you to drive without distraction. it easily and securely holds your phone through bumps, sharp turns or even sudden stops, no worrying of dropping your phone.
- ✅【SUPER STICK FORCE】 - VHB Dash Mounted Holders adhesive provides strong stick force between the dashboard and the car phone holder, which can firmly stick to any plane in the car, fix your device, adapt to a variety of road conditions such as sudden braking, speed bump, and rugged mountain road.
- ✅【SAFE DRIVING VIEW】 - Mini-size, not taking up space, it is placed in the dashboard without blocking the view at all, and does not need to look down at the device to ensure your safe driving. Cell Phone Car Mount is suitable for most cars, pickups, SUV, taxi; It is the best assistant for Uber and Lyft drivers
- ✅【360° FREE ROTATION】 - With an adjustable swivel ball joint, you can rotate your smartphone or device at your own will, providing the best viewing angle. Quickly pick and place with one hand, free your hands and make calls and GPS navigation more convenient
The N57TU training material is the appropriate BMW reference for understanding this family-level distinction: BMW N57TU Diesel Engine Technical Training Manual. For a purchase, repair or identification decision, supplement the family name with the full vehicle model and model year.
Model badges are generation-specific
“740d” and “750d” are not timeless engineering definitions. BMW can change the engine fitted to a badge when it updates a model generation. A 750d from one period may therefore use a different turbocharger architecture from a 750d from a later period.
This is especially important for the 2016 update. BMW announced that the new 750d and 750Ld used four turbochargers, producing 294 kW (400 hp) and 760 Nm. BMW described that engine as replacing the previous three-turbo system. The announcement is dated May 17, 2016, and is available in BMW’s release, “Celebrating its premiere in the BMW 7 Series model range: the world’s most powerful six-cylinder diesel engine.”
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Do not confuse the N57S tri-turbo with BMW’s later four-turbo diesel
The three-turbo N57S comparison belongs to the earlier 750d specification represented by the 381 hp, 740 Nm entry. BMW’s later announcement gives a different configuration and different ratings:
| Application | Turbocharger count | Rated power | Peak torque | How to classify it |
|---|---|---|---|---|
| Earlier 750d xDrive specification | Variable tri-turbo | 280 kW / 381 hp | 740 Nm | N57S-era three-turbo comparison |
| 2016 750d/750Ld announcement | Four turbochargers | 294 kW / 400 hp | 760 Nm | Successor configuration, not the N57S tri-turbo |
The 2016 figures are quoted as BMW’s announced ratings for the new engine. They should not be inserted into a table comparing the earlier N57S tri-turbo with the 740d twin-turbo. Doing so mixes generations and makes the turbo-count comparison misleading.
What the power and torque gap means for a buyer
Acceleration and load capability
On paper, the 750d’s 381 hp and 740 Nm give it a higher performance ceiling than the 740d’s 313 hp and 630 Nm. The extra torque is particularly relevant to the engine’s ability to deliver force under load, while the higher power rating describes its capacity to sustain output as engine speed rises. Actual acceleration also depends on vehicle weight, transmission gearing, traction, software and test conditions, none of which are established by the cited specification table.
Rank #4
- Buyer's Guide: The seat guard for car seat between seat & console measures 15.75*2.7*1.53", suitable for gaps of 1.43-1.53" in width, please double-check carefully the distance between your seat and the center console before placing an order
- Storage and Filling in One: Differ from traditional single-function gap fillers, gap filler for car incorporates storage function, offers you the convenience of storing phones and various other items, so that you can access them at any time while driving
- Avoid Items Slipping: With the bumps and vibrations of the car, phones, keys may fall into the seat crevices, which is difficult to pick up, and distracts the driver's attention. Car gap seat filler fills gaps seamlessly to create an effective barrier
- Easy to Install: Car side seat gap filler is easy to install, simply insert it into the gap between the seat and the center console, gap seat filler for car can fit tightly without affecting the normal adjustment of the seat and the use of the seat belt
- Premium Material: Crafted from premium EVA material, our car seat side gap filler boasts a combination of wear-resistant, softness&durability. Maintenance is effortless, simply rinse and wipe to quickly clean the dust and debris in corners and crevices
Specification identification
If you are checking an advertisement, workshop estimate or imported vehicle, treat the following as minimum identification data:
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →- Exact model designation, such as 740d xDrive or 750d xDrive.
- Model year and generation.
- Engine family and full engine code where available.
- Turbocharger description in the factory documentation.
- Rated power in kW or hp and peak torque in Nm.
A seller’s phrase such as “N57 triple turbo” is incomplete without the vehicle and year. It may refer to the earlier 750d application, while a later 750d can use the four-turbo successor described by BMW in 2016.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Maintenance, durability and fuel economy: what the cited evidence does not establish
It is tempting to assume that the tri-turbo engine is automatically less reliable, more expensive to repair or less economical than the twin-turbo version because it has an additional turbocharger. The supplied BMW specifications and training reference do not establish those outcomes.
They do not provide a controlled durability comparison, a maintenance-cost schedule, repair-failure statistics, identical-condition fuel-economy testing or a component-by-component complexity analysis for the 740d and 750d. Therefore, no evidence-based conclusion can be drawn here that one configuration will last longer, cost more to service or use more fuel in every circumstance.
For an ownership decision, obtain records for the specific vehicle and verify the exact engine variant. Turbocharger replacement hardware is not universal: fitment can vary by engine variant, vehicle and turbo stage. A generic search for “BMW N57 turbocharger” is not enough to select a part. Confirm the engine code and the original component or catalog number with a qualified BMW specialist before ordering.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsHow to compare a used N57 twin-turbo and tri-turbo car
Step 1: Verify the generation
Start with the vehicle identification number, registration documentation and production date. This prevents a later four-turbo 750d from being incorrectly identified as the earlier N57S tri-turbo.
Best Value
- 🔰 UPGRADED SIDE STORAGE DESIGN - Our console cover is thinner than the old one, universal for all seasons. There is an 8.66*5.12 inch storage pocket design on each left and right side, expanding the storage space, convenient and practical. Meet the storage needs of the main passenger seat, you can store your cell phone, keys, tissues, ID and some other small daily items.
- 🔰 PREMIUM MICROFIBER LEATHER MATERIAL - This car center console cover is made of quality microfiber leather material, soft and skin-friendly touch. Exquisite and fashionable diamond shaped stitching, every detail is in place. Inside the car center console cover is made of thickened memory foam, even after squeezing, it can slowly recover to its original shape.
- 🔰 RELIEVE DRIVING FATIGUE - The arm rest cover for car adopts ergonomic design, giving just the right amount of arm support, effectively dispersing elbow pressure and relieving driving fatigue. Protect your car's center console from getting dirty or scratched. Especially suitable for long time driving or long distance traveling, bringing you a new experience of relaxation and comfort!
- 🔰 NON-DESTRUCTIVE INSTALLATION - This car console cover is designed with an elastic band for a firm fit and not easy to shake. And the back side is full of protruding dots, which can effectively avoid the armrest cover from slipping and shifting. All you need to do is to open the center console cover, put the elastic band directly into the cover and then close it.
- 🔰 BUYER'S GUIDE - You will receive a car armrest storage box with the size of 12.13*7.80 inch, please measure the size of your car's armrest storage box before you buy. We have prepared five simple and beautiful colors for you, you can choose according to your own preferences. Suitable for most of the vehicles on the market, such as car, truck, SUV, RV, van, etc.
Step 2: Confirm the engine variant
Use factory documentation or a BMW technical information source to confirm the full engine code. The N57 family label alone does not identify the turbo configuration.
Step 3: Match the factory output
Compare the documented rating with BMW’s figures for that model and generation. For the cited 7 Series specification, 740d xDrive corresponds to 313 hp and 630 Nm, while 750d xDrive corresponds to 381 hp and 740 Nm.
Step 4: Inspect records rather than infer condition from turbo count
Review service invoices, oil-service intervals, cooling-system work, emissions-system repairs and any turbocharger replacement documentation. Turbo count tells you how the engine was designed; it does not reveal the maintenance condition of an individual car.
Step 5: Match replacement parts to the exact application
Before buying a turbocharger, actuator or related hose, match the vehicle identification number, engine code and turbo position. A part listed for an N57 may fit only one variant or one stage of a multi-turbo system.
Common comparison mistakes
Calling every N57 a tri-turbo
The N57 designation covers multiple variants. The 740d and 750d entries in BMW’s table demonstrate that two N57-family applications can use different turbo descriptions.
Using 2016 figures for the earlier comparison
The 400 hp, 760 Nm four-turbo announcement belongs to the successor configuration. It is not the rating for the earlier three-turbo N57S comparison.
Attributing the whole output difference to turbo count
The published table shows a correlation between the 740d twin-turbo entry and the 750d tri-turbo entry. It does not provide a controlled experiment that holds every other engine and vehicle variable constant.
Assuming a badge guarantees one engine
Model badges can continue across generations while the engine architecture changes. Always pair the badge with the year and technical documentation.
Ordering a universal replacement turbo
Multi-turbo systems have variant- and position-specific hardware. Confirm fitment before purchase; no universal N57 turbocharger compatibility is established by BMW’s general family documentation.
Quick Recap
Key takeaways for the N57S versus twin-turbo question
- The N57S is the high-output N57 variant associated with BMW’s variable tri-turbo system.
- In BMW’s cited 7 Series specifications, the 750d xDrive tri-turbo is rated at 381 hp and 740 Nm.
- The 740d xDrive variable twin-turbo is rated at 313 hp and 630 Nm in the same specification set.
- The listed 750d therefore has 68 hp and 110 Nm more than the listed 740d.
- Those are model-specific ratings, not universal outputs for every N57 twin- or tri-turbo engine.
- BMW’s 2016 750d/750Ld successor used four turbochargers and produced 400 hp and 760 Nm; it should be kept separate from the N57S tri-turbo comparison.
- The available sources do not prove a universal difference in reliability, repair cost or fuel economy.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
