The FX35 uses the VQ35HR engine in the 2007 and 2008 model years.
Infiniti rolled out the VQ35HR, a higher-rev version of the 3.5-liter V6, during a mid-cycle refresh around 2007. Among the FX35 lineup, the HR variant was most commonly found in the 2007 and 2008 models, with later years in some markets using different variants. Here’s what you need to know to identify the engine in an FX35.
What is the VQ35HR?
The VQ35HR is Infiniti/Nissan’s high-rev version of the 3.5-liter V6 (VQ35). It features revisions to intake, cam timing, and related components to improve throttle response and mid-range torque, compared with the earlier VQ35DE variant.
For the FX35, this HR variant was introduced around the 2007 refresh cycle and was commonly found in 2007–2008 models in many markets. Availability can vary by region and production date, so some late-2007 or early-2009 units may differ depending on where they were sold.
Here are the main indicators to look for if you’re trying to confirm the engine variant in an FX35.
Key indicators to verify VQ35HR in FX35:
- Engine badge or valve cover labeling reading VQ35HR or a similar HR designation.
- Model year alignment: FX35 models marketed as 2007 or 2008 in the United States and many other markets are the ones most commonly associated with the HR engine.
- Performance cues: noticeably quicker throttle response and stronger mid-range torque compared with earlier VQ35DE-based FX35s (when tested on the same chassis).
Note: For absolute confirmation, check the vehicle’s documentation or contact an Infiniti dealer with the VIN. Engine variants can vary by region and production date, and some markets may have used different VQ35 configurations even within the same model year.
Model year overview
The FX35 was part of Infiniti’s early- to mid-2000s VQ35 family, and the HR variant marked a mid-cycle upgrade for certain markets. The commonly cited window for FX35 with the VQ35HR is the 2007–2008 model years.
- 2007 FX35: commonly equipped with VQ35HR in many markets
- 2008 FX35: commonly equipped with VQ35HR in many markets
Beyond these years, engine configurations could vary by region and production date; verify with VIN/documentation for certainty.
Summary
The VQ35HR variant appears on the FX35 primarily in the 2007 and 2008 model years in many regions. If you own an FX35 or are shopping for one, confirm with the VIN or your dealer to be sure of the exact engine variant for your vehicle.