2004 Nissan Sentra Se R Specs

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2004 Nissan Sentra Se R Specs

Alright, let's dive deep into the specifics of the 2004 Nissan Sentra SE-R. This isn't your grandma's Sentra; the SE-R and especially the SE-R Spec V were performance-oriented variants that offered a much more engaging driving experience. We'll break down the engine, transmission, suspension, brakes, and a few other key components to give you a solid understanding of what makes this car tick.

Engine: QR25DE – The Heart of the Matter

The 2004 Sentra SE-R and SE-R Spec V both sport the QR25DE engine, a 2.5-liter (2488cc) inline-4 gasoline engine. Now, before we get too deep, it's critical to understand the internal differences between the earlier QR25DE iterations (2002-2003) and the revised 2004-2006 models. The 2004+ engines addressed some of the oil consumption issues seen in the earlier versions through piston ring redesigns and other subtle internal changes. Always verify engine production dates if you're sourcing a used engine or parts.

Engine Specifications

  • Type: Inline-4, DOHC (Dual Overhead Camshaft), 16-valve
  • Displacement: 2.5 liters (2488 cc)
  • Bore x Stroke: 89 mm x 100 mm (3.50 in x 3.94 in)
  • Compression Ratio: 9.5:1
  • Fuel System: Multi-point fuel injection (MPFI)

The QR25DE uses an aluminum alloy cylinder head and block to save weight. It also features Nissan's Variable Induction Control System (NICS). This system uses butterfly valves in the intake manifold to optimize intake airflow based on engine speed. At lower RPMs, the valves close, increasing intake air velocity for improved low-end torque. At higher RPMs, the valves open, allowing maximum airflow for peak horsepower.

Horsepower and Torque

Here’s where the SE-R models differentiate themselves. The standard SE-R made roughly 165 horsepower at 6000 RPM and 175 lb-ft of torque at 4000 RPM. The more aggressive SE-R Spec V boasted a slightly higher output, rated at 175 horsepower at 6000 RPM and 180 lb-ft of torque at 4500 RPM. This increase was primarily due to a slightly different ECU tuning and, most notably, the use of a freer-flowing exhaust system and intake manifold. Note that these figures can vary slightly depending on dyno conditions and the overall health of the engine.

Transmission: Manual vs. Automatic

The 2004 Sentra SE-R offered two transmission options: a 4-speed automatic and a 5-speed manual. However, the SE-R Spec V was only available with a 6-speed manual transmission – and what a transmission it is!

5-Speed Manual (SE-R)

The 5-speed manual, while perfectly adequate, isn't the star of the show. It's a decent unit for daily driving, but it's not particularly robust and doesn't offer the same level of engagement as the 6-speed. If you're planning on serious performance modifications, you'll likely want to consider swapping in the 6-speed or a stronger aftermarket option.

6-Speed Manual (SE-R Spec V)

This is where things get interesting. The 6-speed manual transmission in the SE-R Spec V is a close-ratio gearbox designed for performance. The gear ratios are specifically chosen to keep the engine within its optimal powerband during acceleration. However, this transmission is known to have a weak point: the limited-slip differential (LSD), more specifically, the rivets that hold it together. Under aggressive driving, these rivets can shear off, leading to catastrophic transmission failure. This is a common issue, and many owners have replaced the factory LSD with aftermarket units that use stronger bolts or even full plate-type LSDs. Keep an eye out for any unusual noises (grinding, clunking) during cornering, which could indicate a failing LSD.

Suspension and Brakes: Handling and Stopping Power

The SE-R models received suspension upgrades to improve handling over the base Sentra. The SE-R Spec V, in particular, benefited from stiffer springs, dampers, and a larger front sway bar.

Suspension

  • Front: Independent MacPherson strut suspension with coil springs and stabilizer bar.
  • Rear: Multi-link beam axle with coil springs and stabilizer bar.

While the basic suspension design is similar between the SE-R and SE-R Spec V, the Spec V's stiffer components result in significantly reduced body roll and improved cornering performance. Many owners further upgrade the suspension with aftermarket coilovers, sway bars, and strut tower braces to fine-tune the handling characteristics to their liking. Pay close attention to the condition of the bushings, especially in older cars, as worn bushings can negatively impact handling and ride quality.

Brakes

The SE-R and SE-R Spec V both feature disc brakes on all four wheels. The front rotors are larger than the rear rotors to provide adequate stopping power. ABS (Anti-lock Braking System) was standard on both models. While the stock brakes are adequate for normal driving, they can quickly overheat under sustained hard braking. Upgrading to performance brake pads and rotors is a common modification for SE-R owners who frequently track their cars or engage in spirited driving. Braided stainless steel brake lines are another worthwhile upgrade, as they reduce brake line expansion under pressure, resulting in a firmer pedal feel.

Other Notable Features

Beyond the core mechanical components, there are a few other things to consider about the 2004 Sentra SE-R models.

  • Wheels and Tires: The SE-R typically came with 16-inch alloy wheels, while the Spec V sported 17-inch wheels. Tire size was also slightly different between the two models.
  • Interior: Both models featured sport seats, a leather-wrapped steering wheel, and unique gauge clusters. The Spec V also included aluminum pedals and footrest.
  • Exterior: Subtle differences in the front and rear bumpers, side skirts, and rear spoiler distinguished the SE-R models from the base Sentra.

Common Issues and Things to Watch Out For

As with any older car, there are a few common issues to be aware of when considering a 2004 Sentra SE-R or SE-R Spec V:

  • Oil Consumption: While the 2004+ QR25DE engines are less prone to oil consumption than the earlier versions, it's still something to monitor. Check the oil level regularly and be prepared to add oil between changes if necessary.
  • Pre-cat Failure (Spec V): The catalytic converter located in the exhaust manifold (pre-cat) can fail, sending debris into the engine and causing damage. This is more common on older cars or those that have been neglected. Replacing the pre-cat with a header is a common solution.
  • Transmission Issues (Spec V): As mentioned earlier, the 6-speed manual transmission in the Spec V is prone to LSD failure. Listen for any unusual noises from the transmission, especially during cornering.
  • Rust: Check for rust, especially in areas prone to corrosion, such as the wheel wells, rocker panels, and undercarriage.
  • Electrical Issues: Like any older car, electrical issues can crop up. Check for proper operation of all lights, gauges, and accessories.

Ultimately, the 2004 Nissan Sentra SE-R and SE-R Spec V are fun and engaging cars to drive. With a little knowledge and preventative maintenance, they can be reliable and rewarding vehicles. Remember to do your research, inspect any potential purchase thoroughly, and don't be afraid to ask questions.

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