Bmw 340I Specifications – The Ultimate Performance And DIY
The BMW 340i represents a high-water mark for the modern sports sedan, blending everyday usability with the legendary power of the B58 engine. Understanding the technical details of this vehicle is essential for owners looking to perform their own maintenance or enthusiasts planning their next performance build.
You probably already know that the 340i is one of the most capable “sleeper” cars on the market today. If you are looking for a vehicle that balances luxury with a massive ceiling for aftermarket tuning, you have come to the right place. In this guide, we will break down the bmw 340i specifications to help you master your machine and keep it running at peak performance.
Whether you are a weekend DIYer or a dedicated track enthusiast, having the right data at your fingertips is the key to success. We will cover everything from engine internals and torque figures to the specific tools you need for a standard oil change. By the end of this article, you will have a professional-level understanding of what makes this car a modern classic.
Our goal is to provide a comprehensive look at the bmw 340i specifications so you can make informed decisions about repairs and upgrades. We will focus on the F30 generation (2016–2018), which introduced the world to the B58 engine, while also touching on the evolution of the platform. Let’s dive into the technical details that define this ultimate driving machine.
The Heart of the Beast: B58 Engine Technical Details
The centerpiece of the 340i is undoubtedly the B58 engine, a 3.0-liter inline-six powerhouse that replaced the outgoing N55. Unlike its predecessor, the B58 features a closed-deck block design, which provides significantly more structural integrity for high-boost applications. This design choice is a favorite among tuners who want to push the engine well beyond factory limits.
One of the most critical bmw 340i specifications involves the turbocharging system. The engine utilizes a single twin-scroll turbocharger integrated into the exhaust manifold to reduce lag and improve thermal efficiency. This setup allows the car to reach peak torque as low as 1,380 RPM, providing an immediate surge of power that feels much larger than its displacement suggests.
Heat management is another area where the B58 shines. It uses an air-to-liquid intercooler integrated directly into the intake manifold. This keeps the intake charge temperatures consistent, even during spirited driving or hot summer days. For the DIY mechanic, this means the intake system is more complex, requiring careful attention when performing top-end work.
Engine Displacement and Power Output
- Engine Type: B58B30M0 3.0L Inline 6-Cylinder
- Horsepower: 320 hp @ 5,500–6,500 RPM
- Torque: 330 lb-ft @ 1,380–5,000 RPM
- Bore and Stroke: 82.0 mm x 94.6 mm
- Compression Ratio: 11.0:1
Advanced Valvetrain Technology
The B58 utilizes BMW’s Double-VANOS and Valvetronic systems. Double-VANOS adjusts the timing of both the intake and exhaust camshafts, while Valvetronic varies the lift of the intake valves. Together, these systems eliminate the need for a traditional throttle body during most driving conditions, reducing pumping losses and improving throttle response.
Drivetrain and Transmission Configurations
When discussing bmw 340i specifications, the transmission is just as important as the engine. BMW offered the 340i with two primary gearboxes: the ZF 8HP 8-speed automatic and a 6-speed manual. The ZF 8-speed is widely regarded as one of the best automatic transmissions in the world, offering lightning-fast shifts and excellent fuel economy.
The manual transmission option is a rarity in the modern era, making manual 340i models highly sought after by enthusiasts. It features rev-matching technology, which automatically blips the throttle on downshifts to ensure a smooth transition. If you prefer total control over your gear changes, the 6-speed provides a mechanical connection that is hard to beat.
Power is delivered to the ground through either the standard Rear-Wheel Drive (RWD) setup or the optional xDrive All-Wheel Drive system. The xDrive system is rear-biased, meaning it maintains the handling characteristics of a traditional BMW while providing extra traction in slippery conditions. This makes the 340i a viable year-round daily driver in snowy climates.
Transmission Gear Ratios (ZF 8-Speed)
- 1st Gear: 5.000
- 2nd Gear: 3.200
- 3rd Gear: 2.143
- 4th Gear: 1.720
- 5th Gear: 1.314
- 6th Gear: 1.000
- 7th Gear: 0.822
- 8th Gear: 0.640
Technical bmw 340i specifications and Performance Metrics
The real-world performance of the 340i is often understated by the factory. While the official bmw 340i specifications list the horsepower at 320, many independent dyno tests have shown that these cars often produce closer to 330–340 wheel horsepower. This “underrating” is a common BMW trait, ensuring the car always feels faster than expected.
In terms of acceleration, the 340i is a serious contender. The RWD model equipped with the automatic transmission can sprint from 0 to 60 mph in approximately 4.8 seconds. The xDrive version cuts that time down to about 4.6 seconds thanks to the added launch traction. For many owners, these figures are just the starting point before adding a Stage 1 tune.
Top speed is electronically limited to 130 mph on models equipped with all-season tires. However, if the car was ordered with the “Track Handling Package” and high-performance summer tires, the limit is raised to 155 mph. Understanding these electronic limiters is important if you plan on taking your vehicle to a closed-circuit track day.
Chassis and Suspension Specs
The 340i features a sophisticated suspension setup designed to balance comfort and cornering ability. Most models come with the M Sport suspension, which sits 10mm lower than the standard 3-series. If your car has the Adaptive M Suspension, you can adjust the damping stiffness through the Drive Experience Control switch.
- Front Suspension: Double-pivot spring-strut axle
- Rear Suspension: Five-link independent suspension
- Steering Type: Electric Power Steering (EPS) with Servotronic
- Turning Circle: 37.1 feet (RWD) / 38.4 feet (xDrive)
Braking System and Wheel Fitment
Stopping power is provided by a robust braking system. Standard 340i models feature 4-piston fixed front calipers and single-piston floating rear calipers. If the car is equipped with the M Sport Brakes (identifiable by the blue calipers), it uses larger rotors and upgraded pads for better fade resistance during heavy use.
When it comes to wheel fitment, the bmw 340i specifications vary based on the package. The standard wheels are 18-inch alloys, but 19-inch options were very common. Enthusiasts often look for “staggered” setups, where the rear wheels are wider than the fronts to provide more grip under acceleration. Pro Tip: If you are a DIYer swapping your own wheels, always use a torque wrench to tighten the lug bolts to 103 lb-ft (140 Nm). Over-tightening can warp the brake rotors, while under-tightening is a major safety hazard. Always check your tire pressures according to the placard located on the driver-side B-pillar.
Brake Rotor Dimensions
- Standard Front Rotors: 340mm x 30mm (Vented)
- Standard Rear Rotors: 330mm x 20mm (Vented)
- M Sport Front Rotors: 370mm x 30mm (Vented)
- M Sport Rear Rotors: 345mm x 24mm (Vented)
DIY Maintenance: Keeping Your 340i Healthy
Maintaining a vehicle with these high-performance bmw 340i specifications requires diligence. While BMW suggests long oil change intervals, many expert mechanics recommend changing the oil every 5,000 to 7,500 miles to protect the turbocharger bearings. The B58 engine requires 6.5 liters of 0W-20 or 5W-30 synthetic oil that meets BMW Longlife-01 or Longlife-17 FE+ standards.
Accessing the oil filter is relatively easy on the B58, as it is located at the top rear of the engine bay. You will need a 32mm socket to remove the filter housing cap. Be careful not to drop the small O-rings into the engine. Always replace the crush washer on the oil pan drain plug to prevent slow leaks over time.
Spark plugs are another critical maintenance item. On the 340i, the recommended interval is every 60,000 miles, but tuned cars should see new plugs every 20,000–30,000 miles. You will need a 14mm thin-walled 12-point spark plug socket and an extension. Ensure the engine is completely cool before removing the plugs to avoid damaging the aluminum threads in the cylinder head.
Common Tools for 340i DIYers
- 17mm Socket: For the wheel lug bolts.
- 10mm Socket: For various underbody shields and battery terminals.
- 8mm Hex/Allen: For the oil drain plug.
- Torx T20 & T25: For interior trim and engine bay plastics.
- OBDII Scanner: Essential for reading codes and resetting service lights.
Common Issues and Reliability Concerns
While the B58 engine is widely considered one of BMW’s most reliable modern engines, it is not without its quirks. One common issue involves the PCV valve (Positive Crankcase Ventilation). The PCV diaphragm can tear, leading to a loud whistling noise and excessive oil consumption. Fortunately, aftermarket repair kits allow you to replace just the diaphragm rather than the entire valve cover.
Another area to monitor is the cooling system. The 340i uses a complex “split” cooling system with two separate expansion tanks—one for the engine and one for the intercooler. If you notice a “Low Coolant” warning, check both tanks immediately. Look for white residue around the caps, as the plastic tanks are known to develop hairline cracks over time.
Lastly, keep an eye on the oil filter housing. Like many BMWs, the gaskets can eventually become brittle and leak. If you see oil pooling in the “valleys” of the engine block, it is likely time for a gasket replacement. Addressing these minor issues early will prevent them from becoming major headaches down the road.
Interior Dimensions and Daily Usability
The 340i isn’t just about speed; it is also a practical luxury car. The interior bmw 340i specifications provide enough room for four adults to travel in comfort. The trunk offers 13 cubic feet of space, which is standard for the segment and can be expanded by folding down the 40/20/40 split rear seats.
Technology-wise, the F30 340i comes with the iDrive 5.0 or 6.0 system. It features a crisp display and an intuitive rotary controller. Many owners appreciate the physical buttons for the climate control and radio presets, which are becoming rarer in newer car models. The Harman Kardon surround sound system is a highly recommended option for audiophiles.
Safety is also a priority. The 340i earned high marks in crash testing and includes features like Frontal Collision Warning and Lane Departure Warning. For the DIYer, it is important to note that the battery is located in the trunk to help achieve a near 50/50 weight distribution, which is key to the car’s balanced handling.
Interior Measurement Breakdown
- Front Headroom: 40.3 inches
- Front Legroom: 42.0 inches
- Rear Legroom: 35.1 inches
- Shoulder Room (Front): 55.1 inches
Frequently Asked Questions About bmw 340i specifications
What is the fuel tank capacity of the BMW 340i?
The BMW 340i has a fuel tank capacity of 15.8 gallons. Given its performance, the car is surprisingly efficient, achieving up to 32 MPG on the highway when driven conservatively in Eco Pro mode.
Does the BMW 340i require premium gasoline?
Yes, to meet the performance bmw 340i specifications and prevent engine knocking, you should use at least 91 octane (AKI) fuel. In many regions, 93 octane is preferred for maximum power and engine longevity, especially if the car is tuned.
What is the difference between the 340i and the M340i?
The 340i (F30) was produced until 2018. The M340i (G20) succeeded it in 2019, featuring an updated version of the B58 engine that produces 382 hp. The M340i also features a more modern interior and an updated chassis, but it lacks the option for a manual transmission.
How much oil does the BMW 340i take?
The B58 engine in the 340i requires exactly 6.5 liters (6.9 quarts) of oil. It is important not to overfill the system, as this can cause pressure issues. Always use the electronic oil level measurement tool in the iDrive menu after an oil change.
Conclusion: Mastering Your 340i
The BMW 340i is a masterpiece of engineering that offers a rare combination of performance, reliability, and daily comfort. By understanding the bmw 340i specifications, you are better equipped to maintain your vehicle and enjoy everything it has to offer. From the robust B58 engine to the precision of the ZF 8-speed transmission, every component is designed for the driving enthusiast.
Remember that the key to a long-lasting BMW is preventative maintenance. Don’t wait for a warning light to tell you something is wrong. Regularly check your fluid levels, inspect your tires, and listen for any unusual noises. Whether you are doing your own oil changes or taking it to a professional, staying informed is your best tool.
We hope this guide has given you the confidence to dive deeper into the world of BMW ownership. These cars are built to be driven and enjoyed, so get out there and experience the road. Stay safe and keep your B58 running strong!
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