If you’re looking for details on a powerful and refined V6, you’ve come to the right place. This article provides a complete technical analysis of the Honda J35Z3 engine specs and performance. Found in specific Acura models, this powerplant represents a high point in Honda’s naturally aspirated V6 development.
It’s known for its smooth power delivery and intelligent variable cylinder management system. We’ll look at everything from its internal dimensions to its real-world driving behavior.
Honda J35Z3 Engine Specs and Performance
Let’s start with the core technical specifications that define the J35Z3. This 3.5-liter V6 is part of Honda’s J-Series family, which has a reputation for reliability and efficiency.
The basic architecture is a 60-degree V6 with SOHC (Single Overhead Camshaft) valvetrain per bank. It uses Honda’s VTEC system on both the intake and exhaust camshafts for optimized valve timing and lift. Here are the fundamental specs:
* Engine Code: J35Z3
* Displacement: 3.5 liters (3,471 cc)
* Configuration: 60-degree V6, SOHC
* Bore x Stroke: 89 mm x 93 mm
* Compression Ratio: 10.5:1
* Valvetrain: SOHC, 4 valves per cylinder with VTEC (i-VTEC)
* Fuel System: Programmed Fuel Injection (PGM-FI)
* Engine Block Material: Aluminum
* Cylinder Head Material: Aluminum
Power and Torque Output
The J35Z3 was tuned for a strong balance of power and low-end torque. Its output figures are respectable for a mid-2000s naturally aspirated engine.
It produces 280 horsepower at 6200 RPM. More importantly, it generates 254 lb-ft of torque at 5000 RPM. The torque curve is relatively flat, thanks to VTEC, providing good responsiveness across the rev range.
Key Performance Features
Several technologies work together to achieve this output. The VTEC system is the star, switching between two cam profiles for economy and power. The Variable Cylinder Management (VCM) system is another critical feature.
VCM can deactivate three cylinders under light load, turning the V6 into a straight-three engine. This significantly improves fuel economy during cruising without the driver noticing.
Detailed Technical Breakdown
To really understand this engine, we need to look at its components more closely. Each part plays a role in its overall performance and character.
Cylinder Block and Internals
The J35Z3 uses a durable aluminum block with cast-in iron cylinder liners. The 89 mm bore and 93 mm stroke give a slightly under-square design, favoring torque. Forged steel connecting rods and hypereutectic aluminum pistons handle the high compression.
The crankshaft is a nodular iron casting with micro-polished journals for reduced friction. A dual-stage oil pump ensures proper lubrication, especially when the VCM system is active.
Cylinder Heads and Valvetrain
The aluminum cylinder heads feature a compact pent-roof combustion chamber. The use of a single overhead camshaft per bank simplifies design but VTEC adds complexity. Each cylinder has two intake and two exhaust valves.
The i-VTEC system here combines Variable Valve Timing and Lift Electronic Control. It adjusts both the timing and the lift of the valves, optimizing for both low-RPM efficiency and high-RPM power.
Induction and Exhaust Systems
Air enters through a tuned intake manifold designed to maximize airflow across the rev range. The exhaust system uses a precise 4-2-1 header design to minimize backpressure and improve scavenging.
This setup helps in extracting every bit of power from the natural aspiration. The result is a linear and predictable throttle response that enthusiasts appreciate.
VCM System: How It Works and Its Impact
The Variable Cylinder Management system is a defining technology for the J35Z3. It’s a fuel-saving feature that doesn’t sacrifice power when you need it.
Here’s a step-by-step look at how VCM operates:
1. The engine control unit (ECU) monitors driving conditions like throttle position, vehicle speed, and engine load.
2. Under light-load conditions (e.g., highway cruising), the ECU decides to activate VCM.
3. It deactivates the valvetrain for cylinders 1, 2, and 3 by using special VTEC rocker arms that decouple from the camshaft.
4. Fuel injection and ignition for those three cylinders are simultaneously shut off.
5. The engine runs on the remaining three cylinders, saving a significant amount of fuel.
6. When you press the accelerator for more power, the ECU reactivates all six cylinders seamlessly, usually within a fraction of a second.
While innovative, early VCM systems could lead to increased oil consumption and mount wear in some cases. It’s a point of consideration for long-term ownership.
Real-World Performance and Driving Experience
On the road, the J35Z3 feels smooth and potent. Power delivery is linear, building steadily towards the 6200 RPM power peak. The transition into the VTEC cam profile is noticeable but not abrupt, adding a surge of higher-RPM power.
The engine is exceptionally refined, with minimal vibration thanks to its balance shafts. When VCM activates, most drivers won’t feel the switch unless they’re watching the indicator. The engine note is a muted growl that becomes more pronounced at higher revs.
Acceleration and Fuel Economy
In the Acura TL Type-S, which was the primary application, this engine delivered 0-60 mph times in the low 6-second range. This was quick for its era.
Fuel economy is where the J35Z3 shined for a performance V6. EPA estimates were around 19 mpg city and 28 mpg highway. The VCM system is directly responsible for the strong highway number, a rare feat for a 280-horsepower engine in the mid-2000s.
Common Applications and Model Years
The J35Z3 wasn’t a widely used engine code. It had one very important application:
* 2007-2008 Acura TL Type-S: This is the flagship performance sedan of the TL line for these years. The J35Z3 was its sole powerplant, paired with either a 6-speed manual or a 5-speed automatic transmission with paddle shifters.
It’s crucial to note that other Acura models used similar 3.5L V6s, but with different engine codes (like J35A8, J35A9). The Z3 designation is specific to the TL Type-S tune and its equipment.
Reliability, Common Issues, and Maintenance
Overall, the J35Z3 is considered a reliable engine. It shares the robust foundation of the J-Series. However, a few issues are worth noting for potential owners or enthusiasts.
Common points to watch include:
* VCM-Related Oil Consumption: Some engines experience higher than normal oil consumption, often linked to the VCM system causing piston ring wear on deactivated cylinders. Regular oil level checks are advised.
* Engine Mount Deterioration: The start-stop vibration from VCM cycling can lead to premature wear of the front and rear hydraulic engine mounts.
* Variable Valve Timing (VVT) Solenoid Clogging: These solenoids can get clogged with debris over time, triggering a check engine light (often P2646 or P2647).
* Water Pump Leaks: As with many Honda engines, the water pump is driven by the timing belt and can begin to leak as a maintenance item.
Essential Maintenance Tips
Following a strict maintenance schedule is key to longevity. Here are the critical steps:
1. Oil Changes: Use a high-quality 5W-20 synthetic oil and change it every 5,000 miles or sooner, especially if you notice oil consumption.
2. Timing Belt Service: The engine has an interference design. Replace the timing belt, tensioner, and water pump every 90,000-105,000 miles without fail.
3. Spark Plugs: Use the recommended iridium plugs and replace them at the 105,000-mile interval alongside the timing belt.
4. Transmission Fluid: If equipped with the automatic, regular fluid changes every 30,000-45,000 miles are crucial for health.
5. Monitor for Leaks: Regularly inspect the valve cover gaskets and oil pan for seeps, which are common on higher-mileage examples.
Tuning and Modification Potential
As a naturally aspirated engine with already high compression, significant power gains without forced induction are limited. However, enthusiasts have found ways to extract a bit more performance.
Popular modifications include:
* Cold Air Intake: Improves intake sound and can provide minor throttle response gains.
* Exhaust Headers and Cat-Back System: Replacing the restrictive factory headers with aftermarket tuned units is the single best NA performance mod. It can free up 15-20 horsepower.
* ECU Tuning: Reflashing the ECU can optimize ignition timing and fuel maps, especially when combined with intake and exhaust mods. It can also raise the RPM limiter.
* VCM Disabler: Many owners install a device to permanently turn off the VCM system. This aims to reduce oil consumption and mount wear, but at the expense of fuel economy.
For major power, turbocharging or supercharging kits are available but are complex and expensive undertakings. The engine’s 10.5:1 compression ratio requires careful tuning and often lower boost levels.
Comparison to Similar Honda V6 Engines
How does the J35Z3 stack up against its siblings? It’s often compared to the J35A8 and J35A9.
The J35A8, found in standard Acura TL and Honda Odyssey models, produces 258 hp. The J35Z3’s 280 hp comes from more aggressive camshafts, a higher-flow intake, and a less restrictive exhaust. The J35A9 from the Acura RL is similar but tuned for more low-end torque and uses a different intake manifold.
The Z3’s specific calibration for the TL Type-S makes it the performance leader of the non-supercharged J35 variants of its time.
FAQs About the Honda J35Z3 Engine
What cars have the J35Z3 engine?
The 2007-2008 Acura TL Type-S is the only vehicle that used this specific engine code.
Is the Honda J35Z3 a good engine?
Yes, it is generally considered a very good engine. It offers a great blend of power, smoothness, and decent fuel economy for its class. Be aware of its common issues like potential oil consumption.
What is the difference between J35A8 and J35Z3?
The J35Z3 has more aggressive camshafts, a performance-tuned intake manifold, a freer-flowing exhaust, and a specific ECU calibration to produce 280 hp, compared to the J35A8’s 258 hp. The Z3 was built for a sport sedan application.
Does the J35Z3 have VTEC?
Yes, it uses Honda’s i-VTEC system on both the intake and exhaust camshafts. This combines variable valve timing and lift.
What is the horsepower of a J35Z3?
The factory rating is 280 horsepower at 6200 RPM and 254 lb-ft of torque at 5000 RPM.
How much boost can a J35Z3 handle?
With proper supporting mods and tune, a built J35Z3 can handle moderate boost (6-8 psi) from a supercharger or turbo kit. The high compression ratio of 10.5:1 makes it less ideal for high boost on stock internals compared to lower-compression engines.
The Honda J35Z3 remains a highlight of Honda’s engineering philosophy. It delivered serious performance without turbos, maintained good efficiency through innovative tech like VCM, and wrapped it all in a package known for reliability. For those who own or are considering a 2007-2008 Acura TL Type-S, you have a peice of Honda’s performance history under the hood. Understanding its specs, behavior, and needs is the best way to enjoy it for the long run.