When Nissan and Infiniti shared their engineering playbook in the late 2000s, they created a mechanical sibling rivalry that still defines enthusiast circles. At the heart of both the Infiniti G37 and the Nissan 370Z lies the iconic VQ37VHR engine. On paper, they share identical DNA, yet they deliver very different driving experiences. If you are trying to understand how this legendary powerplant performs across both platforms, you need to look past the shared specifications and examine how chassis weight, exhaust routing, and tuning potential change the outcome.
The VQ37VHR is a 3.7-liter naturally aspirated V6 that introduced Nissan's Variable Valve Event and Lift (VVEL) technology. In the Nissan 370Z, this engine produces 332 horsepower at 7,000 RPM and 270 lb-ft of torque at 5,200 RPM. In the Infiniti G37 coupe, it generates 330 horsepower (and 328 horsepower in the sedan) with the same 269 to 270 lb-ft of torque. While the raw engine output numbers are nearly identical, the real-world performance divergence stems from vehicle architecture. The 370Z benefits from a shorter wheelbase and a lighter curb weight, giving it a sharper power-to-weight ratio and a more aggressive throttle response off the line.
Mechanical Architecture and Output Differences
Underneath the valve covers, the VQ37VHR uses dual intake paths, an 11.0:1 compression ratio, and a high redline set at 7,500 RPM. Despite sharing the exact same long block across standard model years, exhaust tuning and backpressure differ due to the physical layout of each car. The 370Z features a shorter, more direct exhaust system that yields a throatier tone and slightly better high-RPM scavenging. The G37, stretched to accommodate a longer chassis and rear seats, uses a longer exhaust path that dampens some of the aggressive rasp inherent to the VQ family.
Cooling capacity also marks a subtle operational difference. Many manual-transmission 370Z models came equipped with factory oil coolers due to their intended track-focused mission, whereas standard G37 models often omitted auxiliary oil coolers unless ordered with the Sport package. If you track a G37 hard on hot summer days, oil temperatures climb quicker than in an equivalent 370Z Sport, making monitoring a vital habit for reliability.
Weight, Dynamics, and Power Delivery
The most noticeable difference during acceleration testing is how the chassis manages the power. The 370Z typically weighs roughly 200 to 300 pounds less than a comparable G37 coupe, and significantly less than a G37 sedan or all-wheel-drive x-model. This weight penalty means the G37 feels more planted on the highway, while the 370Z feels agile and twitchy in tight corners.
Power delivery in both cars peaks high in the rev range. You have to wring out the engine past 5,000 RPM to access the true power band. Low-end torque is adequate for daily driving, but true acceleration lives near the top of the tachometer. The 370Z leverages its lower mass to achieve a zero-to-sixty sprint in roughly 4.8 to 5.1 seconds, while the heavier G37 coupe usually trails by a few tenths, landing closer to 5.2 to 5.4 seconds depending on transmission and drivetrain configuration.
- Curb Weight Advantage: The 370Z sheds unneeded mass by omitting rear seats, resulting in a superior power-to-weight ratio.
- Exhaust Routing: The Z utilizes shorter piping, producing a louder, more aggressive factory note.
- Drivetrain Options: The G37 offered an intelligent All-Wheel Drive (AWD) layout (G37x), adding extra mechanical drag and weight in exchange for all-weather traction.
Modification and Tuning Potential
Because the engines are fundamentally identical, bolt-on performance parts yield nearly identical gains. Enthusiasts frequently install cold-air intakes, test pipes, cat-back exhaust systems, and custom dyno tunes. Upgrading the intake manifolds and adding long-tube headers unlocks the upper limits of the naturally aspirated VQ37VHR, often pushing output past 350 wheel horsepower when combined with E85 fuel tuning.
However, maintenance items and common failure points transfer directly between both platforms. Gallery gaskets—internal oil gallery paper gaskets that can degrade and cause low oil pressure—are a known issue for pre-2012 models on both the G37 and 370Z. Concentric Slave Cylinders (CSCs) on manual transmission models frequently fail over time, requiring an aftermarket heavy-duty replacement kit to ensure clutch reliability.
To explore how Nissan engineered these performance platforms during this era, you can review specifications directly through Edmunds or read owner discussions on dedicated enthusiast forums like MyG37.
Frequently Asked Questions
Are the engines in the Infiniti G37 and Nissan 370Z completely identical?
Yes, the core long block, cylinder heads, and VVEL systems are functionally identical. Minor variations exist in accessory brackets, oil cooler setups, and ECU tuning maps, but you can swap a long block between the two cars with minimal adjustments.
Why does the Nissan 370Z feel faster than the G37?
The difference in perceived speed comes down to weight and gearing. The 370Z is lighter and has a shorter wheelbase, which translates to sharper handling and quicker acceleration response despite sharing almost identical horsepower ratings.
Which car is better for long-distance daily driving?
The Infiniti G37 is generally considered the superior daily driver due to its longer wheelbase, better sound insulation, more forgiving suspension tuning, and usable rear seats. The 370Z rides harsher, features more cabin road noise, and offers less cargo flexibility.
Do both cars require premium gasoline?
Yes, both the G37 and 370Z require premium unleaded fuel (91 octane or higher) to achieve their rated power and prevent engine knock under high compression. Running lower octane fuel reduces performance and triggers timing retard protocols in the ECU.
