If you’re looking for a powerful and refined V6 engine, the Honda J37A5 is a standout choice. This guide provides a complete look at the Honda J37A5 Engine Specs and Performance. Found in some of Honda’s most respected vehicles, this powerplant combines smooth operation with impressive capability.
We’ll break down everything you need to know, from its basic architecture to its real-world driving feel. Whether you’re a potential buyer, an owner, or just a Honda enthusiast, you’ll find the detailed technical information here.
Honda J37A5 Engine Specs and Performance
The J37A5 is a 3.7-liter, naturally aspirated V6 engine that represents the peak of Honda’s J-Series V6 development. It was designed to offer a significant step up in power and torque from the smaller 3.5-liter versions, all while maintaining the reliability and smoothness Honda is known for.
This engine was not as widely used as some other J-series engines, making it a bit of a special find. It’s primary application was in the 2012-2014 Acura TL SH-AWD with the 6-speed manual transmission. This specific pairing created a legendary performance sedan that is still highly sought after today.
Let’s start with the fundamental technical specifications that define this engine.
Detailed Technical Specifications
Here are the core specs that form the blueprint of the J37A5. These numbers tell the story of its design philosophy.
* Engine Type: 60-degree V6, SOHC (Single Overhead Camshaft)
* Displacement: 3.7 liters (3,664 cc)
* Bore x Stroke: 90.0 mm x 96.0 mm
* Compression Ratio: 11.2:1
* Valvetrain: VTEC (Variable Valve Timing and Lift Electronic Control) on both intake and exhaust camshafts
* Fuel System: Programmed Fuel Injection (PGM-FI)
* Recommended Fuel: Premium unleaded (91 octane or higher)
* Engine Block Material: Aluminum alloy
* Cylinder Head Material: Aluminum alloy
The bore and stroke ratio gives you a clue about its character. The 96mm stroke is relativly long for a Honda V6, contributing to its strong low-end and mid-range torque.
Power and Torque Output
The performance figures are where the J37A5 truly shines. It was the most powerful production J-series engine ever released in North America.
* Maximum Horsepower: 305 hp @ 6300 rpm
* Maximum Torque: 273 lb-ft @ 4500 rpm
The torque curve is particularly noteworthy. With VTEC working on both camshafts, the engine delivers strong pull from low revs and builds smoothly to a satisfying high-RPM peak. The torque peak at 4,500 rpm means you get robust acceleration without always having to rev the engine to its limit.
Key Engine Features and Technology
The J37A5 isn’t just about displacement. It incorporates several advanced Honda technologies that contribute to its performance, efficiency, and smoothness.
Dual-Stage Intake Manifold
This system uses two different length intake paths. At lower engine speeds, a longer path is used to increase air velocity and improve low-end torque. At higher RPMs, a shorter path opens up to allow for maximum airflow and top-end power. The transition is seamless and you can feel the engine breathing more freely as the revs climb.
i-VTEC System
The “intelligent” VTEC system in the J37A5 is more advanced than earlier versions. It provides continuous variable timing on the intake cam and a two-stage profile switch (VTEC) on both intake and exhaust cams. This allows for:
* Improved fuel economy at cruise.
* Reduced emissions.
* A broad, flat torque curve.
* High-RPM horsepower gains.
Drive-by-Wire Throttle
Also known as Electronic Throttle Control (ETC), this system replaces the traditional mechanical throttle cable. It provides precise throttle response and allows the engine computer to integrate with stability and traction control systems for enhanced safety.
Aluminum Alloy Construction
The entire engine block and cylinder heads are made from lightweight aluminum. This reduces overall vehicle weight, which helps with both performance and fuel efficiency. Despite its power, the engine remains relatively light for its size.
Performance and Driving Experience
So what’s it actually like to drive a car with the J37A5? The experience is defined by smooth, linear power delivery and a distinct V6 growl.
From behind the wheel, you’ll notice the torque is immediately accessible. There’s no need to wait for a turbo to spool up; acceleration is instant and urgent. The power builds in a very linear fashion all the way to the 6,800 rpm redline. The engine note is refined but becomes more aggressive as VTEC engages, offering a rewarding soundtrack for spirited driving.
Paired exclusively with the close-ratio 6-speed manual in the TL SH-AWD, it creates a engaging and direct connection between the driver and the road. The all-wheel-drive system puts the power down effectively, eliminating wheelspin and providing confidence in all weather conditions.
Fuel Economy and Efficiency
For a 305 hp V6 from its era, the J37A5 is reasonably efficient. Its advanced technologies help balance performance with fuel consumption.
Official EPA estimates for the 2012-2014 Acura TL SH-AWD 6MT were:
* City MPG: 17
* Highway MPG: 25
* Combined MPG: 20
Real-world driving will vary, but these figures are respectable for a heavy, all-wheel-drive performance sedan. Using premium fuel is non-negotiable for achieving the advertised power and proper engine operation.
Common Applications: What Cars Have the J37A5?
The engine’s application is very specific, which adds to its unique appeal.
* 2012-2014 Acura TL SH-AWD (6-Speed Manual Only): This is the sole application. The automatic transmission models in the same years and body style used a different 3.7L engine (the J37A4). The J37A5 and the manual transmission were a special performance package.
This limited use makes the J37A5 a rare gem. If you see a manual transmission TL SH-AWD from these years, you know it has this special engine under the hood.
Maintenance and Reliability Considerations
Honda’s J-series engines have a well-earned reputation for longevity and durability. The J37A5 benefits from this robust design, but it has a few specific maintenance points to keep in mind.
* Timing Belt: Unlike some Honda four-cylinder engines, the J37A5 uses a timing belt. Honda recommends replacement every 105,000 miles or 7 years, whichever comes first. This is a critical service item.
* Spark Plugs: Use only the recommended iridium-tipped spark plugs. Replacement interval is typically around 105,000 miles.
* Oil and Filter: Use full synthetic 5W-20 oil and change it regularly, every 5,000-7,500 miles depending on your driving conditions.
* Variable Cylinder Management (VCM): The J37A5 does not have VCM. This is a key difference from other J37 engines and is seen as a positive by enthusiasts, as VCM can sometimes lead to oil consumption or vibration issues in other models.
Overall, with proper care, this engine is capible of reaching high mileage without major issues. Its lack of complex turbochargers or hybrid systems simplifies long-term ownership.
Potential Issues and Weak Points
No engine is perfect. While the J37A5 is very reliable, there are a few areas where attention may be needed as the engine ages.
* Water Pump: Often replaced preventatively during the timing belt service, as it is driven by the timing belt.
* Valve Cover Gaskets: Like many aluminum engines, the valve cover gaskets can seep oil over time and many miles. This is usually a minor repair.
* Engine Mounts: The high torque output can lead to worn engine mounts, especially the rear mount. Symptoms include increased vibration and a clunk during hard acceleration or gear changes.
* Oil Consumption: Some J-series engines can develop minor oil consumption at high mileage. It’s a good habit to check your oil level between changes.
These are generally considered normal wear items for a high-performance engine and are not indicative of a fundamental design flaw.
Tuning and Modification Potential
The J37A5 responds well to basic bolt-on modifications, though its naturally aspirated design means large power gains require significant investment.
Common first steps for enthusiasts include:
1. Cold Air Intake (CAI): Improves intake sound and can free up a few horsepower.
2. Exhaust System: A cat-back or axle-back system reduces exhaust restriction and enhances the V6 sound without being overly loud.
3. ECU Tuning/Re-flash: This is where the most significant gains are found for a NA engine. A custom tune can optimize ignition timing, fuel maps, and VTEC engagement points, often resulting in 15-25 hp gains across the power band.
It’s important to note that forced induction (supercharging or turbocharging) is complex and expensive on this engine due to its high compression ratio. Most owners enjoy it in its naturally aspirated state, which is plenty powerful for street use.
J37A5 vs. Other Honda V6 Engines
How does it stack up against its siblings?
* vs. J35 (3.5L): The J37A5 offers about 20-30 more horsepower and significantly more torque. The longer stroke gives it a torque advantage that is very noticeable in daily driving.
* vs. J37A4 (3.7L Auto): The J37A4 in automatic TLs has slighty different tuning and components to match the automatic transmission. The J37A5 is the more performance-oriented variant.
* vs. J32 (3.2L): The J37A5 is a clear step up in displacement and power, though the J32 is a fantastic and smoother engine in its own right.
The J37A5 sits at the top of the J-series family tree for pure NA power output in a passenger car.
FAQ Section
What is the Honda J37A5 engine?
It’s a 3.7L V6 engine with 305 horsepower, used only in the manual transmission Acura TL SH-AWD from 2012-2014.
How much horsepower does a J37A5 have?
It produces 305 horsepower at 6,300 revolutions per minute.
What is the difference between J37A4 and J37A5?
The J37A5 is the version paired with the 6-speed manual transmission and has specific tuning and components for that application. The J37A4 is for automatic models.
Is the Honda J37A5 a reliable engine?
Yes, it is considered very reliable. It lacks the VCM system found in other J37 engines, which is a plus. Following the timing belt schedule is the key to its longevity.
What kind of gas does a J37A5 take?
It requires premium unleaded fuel (91 octane or higher) for optimal performance and to prevent engine knocking.
Does the J37A5 have VTEC?
Yes, it features an advanced i-VTEC system that operates on both the intake and exhaust camshafts for improved power and efficiency.
What car has a J37A5 engine?
Only the 2012, 2013, and 2014 Acura TL with SH-AWD and the 6-speed manual transmission option.
In summary, the Honda J37A5 engine is a high-point in Honda’s naturaly aspirated V6 history. It offers a compelling mix of robust power, technical sophistication, and proven reliability. Its exclusive pairing with a manual transmission in a capable AWD sedan makes it a unique and rewarding powertrain for the driving enthusiast. If you have the opportunity to own or drive one, you’ll experience a refined yet potent engine that represents a specific and excellent era of Honda engineering.