The JWT Stage 3 Camshaft: A Deep Dive into a 55 HP Gain

The Nissan 350Z, powered by the VQ35DE engine, remains a favorite among enthusiasts for its balance of affordability, chassis dynamics, and tuning headroom. While bolt-on mods like exhaust and intake provide incremental gains, the camshaft is where the engine's true character is unlocked. The JWT (Jim Wolf Technology) Stage 3 Camshaft is a well-known contender in this space, promising substantial top-end power. This article examines a real-world build that delivered a verified 55 horsepower increase, breaking down the hardware, installation, supporting modifications, tuning requirements, and the resulting driving experience.

Understanding the JWT Stage 3 Camshaft: Specifications and Design Goals

The JWT Stage 3 camshaft is designed for enthusiasts who prioritize peak horsepower over low-end torque, making it a strong choice for track or street builds aimed at higher RPM performance. Unlike milder Stage 1 or Stage 2 grinds, the Stage 3 profile aggressively alters valve timing and lift.

Key Specifications

  • Intake Duration: 264 degrees at 0.050-inch lift
  • Exhaust Duration: 264 degrees at 0.050-inch lift
  • Valve Lift: 0.380 inches (intake and exhaust)
  • Lobe Separation Angle: 112 degrees

These figures represent a significant departure from the stock camshaft, which features a milder 248-degree intake and 240-degree exhaust duration with lower lift. The increased duration extends the time the intake and exhaust valves remain open, allowing more time for air to enter and exit the cylinder. The higher lift pushes the valves further into the combustion chamber, reducing restriction at high RPMs. The 112-degree LSA provides a balance between smooth idle characteristics and power band width, though some lope is expected.

Airflow Dynamics

By optimizing valve overlap, the JWT Stage 3 camshaft improves cylinder scavenging at higher engine speeds. This effect, sometimes called "ram tuning," uses the inertia of the exhaust flow to help draw in a fresh charge of air, effectively increasing volumetric efficiency. The result is a build that breathes freely above 4,500 RPM, pulling hard all the way to the 7,000 RPM redline.

Installation: What to Expect

Installing performance camshafts in a VQ35DE is a moderate-to-advanced project. Expect to spend a full day in the garage if you are experienced, or leave the car with a specialist for a weekend. The process requires careful attention to timing marks and torque specifications to avoid engine damage. A full timing chain service is strongly recommended while you are in there.

Step-by-Step Overview

  1. Preparation: Disconnect the battery, drain the coolant, and remove the intake manifold, valve covers, radiator, and the accessory drive belt. Label all electrical connectors and vacuum lines.
  2. Timing Chain Access: Remove the crankshaft pulley, front timing cover, and the timing chain tensioner. Rotate the crankshaft to top dead center (TDC) on cylinder number one.
  3. Camshaft Removal: Unbolt the camshaft bearing caps in a staggered pattern to avoid warping the cam. Carefully lift out the stock camshafts, noting the orientation of the camshaft position sensor reluctor rings.
  4. Installation: Lubricate the new JWT camshafts with fresh engine oil and assembly lube. Place them into the bearing journals, install the caps, and torque to factory specifications in the correct sequence (usually 8-10 Nm in three passes).
  5. Timing Verification: Install the timing chain, ensuring the colored links align with the marks on the camshaft sprockets and crank sprocket. Rotate the engine by hand twice to verify no valve-to-piston contact occurs. This step is critical—mistiming a VQ35DE can result in bent valves.
  6. Reassembly: Install a new timing chain tensioner, front cover, water pump (if needed), valve cover gaskets, intake manifold, and all accessories. Refill with coolant and oil.

Tools and Parts Required

  • Complete socket and torque wrench set (including 10mm, 12mm, 14mm, 17mm, and 19mm sockets)
  • Camshaft alignment tool or a straight edge
  • Timing chain tensioner tool (or a self-tensioner kit)
  • New valve cover gaskets, timing chain tensioner, and front crankshaft seal
  • Engine coolant and high-quality synthetic oil

Supporting Modifications for Optimal Results

The JWT Stage 3 camshaft alone will not deliver its full potential on an otherwise stock engine. The 55 horsepower increase referenced in this build was achieved with a carefully selected set of complementary modifications. Without these supporting parts, the camshaft may actually reduce low-end torque and driveability.

Essential Upgrades

  • Aftermarket ECU and Tune: The stock ECU cannot properly handle the altered cam timing. A standalone or piggyback ECU (such as UpRev, Haltech, or AEM) with a professional tune is mandatory. The tune adjusts fuel maps, ignition timing, and VVEL control (if applicable) to match the new cam profile.
  • High-Flow Exhaust System: A free-flowing exhaust (headers, test pipes or high-flow cats, and a cat-back system) reduces back pressure, allowing the engine to expel exhaust gases more efficiently. Expect a 10-15 horsepower gain from the exhaust alone when paired with the camshaft.
  • Cold Air Intake: A quality cold air intake system (such as from AEM, K&N, or Stillen) ensures the engine receives cool, dense air. The CAI alone is worth 5-8 horsepower at higher RPMs.
  • Plenum Spacer or Ported Intake Manifold: The VQ35DE suffers from restrictive intake plenum runners. A spacer (like the Motordyne MREV2) or a ported manifold improves air distribution and flow across all cylinders, adding 8-12 horsepower.
  • Port and Polished Cylinder Heads: If the engine is out of the car, a full head porting job ensures maximum airflow. This can add another 10-15 horsepower.
  • Upgraded Valve Springs and Retainers: At high RPM, stock valve springs may experience float, limiting performance. JWT offers dual valve spring kits specifically for this camshaft. This is a low-cost reliability upgrade.
  • Larger Fuel Injectors and Fuel Pump: If you plan to push the build further with nitrous or forced induction later, upgrading the fuel system now saves future labor.

Dyno-Proven Results: The 55 HP Gain Examined

The build in question arrived at the dyno with a baseline configuration featuring a cold air intake, a full exhaust system (including long-tube headers and a test pipe), and an UpRev tune. After the JWT Stage 3 camshafts were installed and the car was retuned on the same dyno, the results were clear: a peak gain of 55 horsepower at the wheels.

Before and After Numbers

  • Baseline (with intake, exhaust, and tune): 280 whp @ 6,200 RPM / 260 lb-ft @ 4,800 RPM
  • After JWT Stage 3 Camshaft Installation (with tune): 335 whp @ 6,800 RPM / 290 lb-ft @ 5,200 RPM

The power curve shifted upward and to the right. Below 3,500 RPM, there was a slight reduction in torque—about 5-8 lb-ft—which is typical for aggressive cam profiles. Above 4,500 RPM, the torque curve climbed steeply and held strong until redline, providing a linear, building surge of power. The engine gained approximately 18 lb-ft of torque at the peak, with the torque curve remaining flatter in the mid-range compared to the stock camshaft.

Why 55 HP?

The 55 horsepower gain came from three primary factors: improved airflow (the camshaft itself), a more aggressive tune that capitalized on the cam's profile, and the free-flowing exhaust that allowed the engine to breathe. On a completely stock engine (no intake, no exhaust, no tune), the same camshaft might only gain 25-30 horsepower at the wheels. The supporting modifications unlocked the cam's full potential.

Tuning: The Make-or-Break Factor

A performance camshaft is only as good as the software controlling it. Factory ECUs rely on defined fuel and ignition tables that assume stock cam timing. When you install a Stage 3 camshaft, the ECU will operate in open-loop conditions during the cam's peak power region, often resulting in a lean air-fuel mixture that can cause detonation and engine damage.

Tuning Requirements for the JWT Stage 3 Camshaft

  • Fuel Map Adjustment: The tune must add fuel in the high-RPM, high-load areas where the cam increases airflow. Expect an additional 8-12% fuel mass at wide-open throttle.
  • Ignition Timing Advance: Aggressive cams require a slight reduction in ignition advance at lower RPM to prevent knock, but allow more advance at higher RPM to exploit the improved flow. A typical curve might reduce advance by 2 degrees below 4,000 RPM and add 3 degrees above 6,000 RPM.
  • Idle Speed Adjustment: The JWT Stage 3 camshaft produces a noticeable lope at idle—part of its character. The idle speed should be raised to 900-1,000 RPM to maintain smooth operation. Most tuners set the idle at 950 RPM.
  • Temperature Management: The tune should incorporate a secondary fuel enrichment table for cold starts and idle stabilization, as the cam's increased overlap can cause the engine to run rough until fully warmed up.

For the best results, use a chassis dyno with a wideband oxygen sensor and a skilled tuner who understands the VQ35DE's idiosyncrasies. A remote tune can work for basic driveability, but a dyno tune is strongly recommended for peak power. UpRev is the most common tuning platform for the 350Z, but standalone options from Haltech offer more granular control.

Driving Dynamics and Real-World Impressions

Driving the car after the install is a transformative experience. The engine now feels like it wants to rev, pulling harder as the tachometer sweeps past 4,500 RPM. The idle has a classic V8-like lope that draws attention at stoplights. However, the trade-offs are real.

Strengths

  • Exhilarating Top-End Pull: From 4,500 to 7,000 RPM, the car accelerates with a ferocity that the stock cam cannot match. This is most noticeable on track days or during highway merging.
  • Aggressive Sound: The exhaust note deepens and becomes more pronounced, especially under load. The intake also emits a sharper, more mechanical sound as the cam lobes operate the valves.
  • Improved Throttle Response: Above 3,500 RPM, the throttle feels sharper. The engine responds instantly to input, making the car feel more alive.

Weaknesses

  • Soft Low-End Torque: Below 3,000 RPM, the engine feels slightly lethargic compared to stock. City driving requires more revs to keep pace with traffic, and hill starts demand a higher idle speed or clutch slip.
  • Drivability Compromise: The loping idle can cause the car to shake at stoplights. Some drivers find this annoying for daily use. Additionally, cold starts require the engine to idle for 30-60 seconds before it stabilizes.
  • Fuel Consumption: The increased airflow and richer tune reduce fuel economy by approximately 2-3 miles per gallon during mixed driving. This is typical for aggressive camshafts.

For a dedicated weekend car or track toy, the JWT Stage 3 camshaft is an excellent choice. For a daily driver, a Stage 2 camshaft may offer a better balance of power and civility.

Cost-Benefit Analysis

Installing a JWT Stage 3 camshaft is not a cheap modification. The total investment, including the camshaft, supporting parts, and professional installation, can approach several thousand dollars. However, the cost per horsepower is favorable when compared to other modifications like forced induction.

Estimated Costs

  • JWT Stage 3 Camshaft Set: $800–$1,000
  • Timing Chain Kit (tensioner, guides, gaskets, seals): $200–$400
  • Valve Spring and Retainer Kit (optional but recommended): $300–$500
  • ECU Tune (dyno time and professional calibration): $600–$1,200
  • Installation Labor (if outsourced): $1,000–$1,800
  • Total Estimated Cost: $2,900–$4,900

Cost per Horsepower

At 55 horsepower gained, the cost per horsepower ranges from approximately $53 to $89. This is significantly cheaper than adding a supercharger kit (which might cost $5,000–$7,000 for 100-120 horsepower, or $50–$60 per horsepower) and far less than a full engine swap or internal engine build. The JWT Stage 3 camshaft represents a solid value for those seeking naturally aspirated performance.

Comparison with Other Camshaft Options

The VQ35DE aftermarket offers several camshaft choices. Understanding where the JWT Stage 3 fits in the hierarchy helps set expectations.

JWT Stage 1 vs. Stage 2 vs. Stage 3

  • Stage 1: 252/252 degrees duration, 0.355-inch lift. Minimal idle change, gains of 15-25 horsepower. Suitable for daily drivers with no supporting mods.
  • Stage 2: 258/258 degrees duration, 0.370-inch lift. Noticeable idle lope, gains of 30-40 horsepower. Requires intake and exhaust to shine.
  • Stage 3: 264/264 degrees duration, 0.380-inch lift. Strong lope, gains of 45-55 horsepower. Requires full bolt-ons and a tune.

For comparison, the Cobb Tuning camshafts for the VQ35DE offer a different profile, focusing on mid-range torque rather than top-end horsepower. The Cosworth camshafts are even more aggressive, with 270 degrees of duration, but they demand extensive head work and are best suited for full-race builds. The JWT Stage 3 hits a sweet spot for street-track dual use.

Long-Term Reliability Considerations

With proper installation and supporting parts, the JWT Stage 3 camshaft does not inherently compromise engine reliability. However, there are factors to monitor.

Valve Train Stress

The increased lift and duration place additional stress on the valve springs and retainers. Factory valve springs may experience fatigue over 20,000–30,000 miles if the cam is driven aggressively. Installing a set of JWT dual valve springs is a low-cost insurance policy that prevents valve float and potential piston-to-valve contact. This is highly recommended for anyone planning to track the car regularly.

Oil Pressure and Lubrication

The VQ35DE is generally robust in terms of oiling. However, aggressive camshafts can cause oil pressure to drop at idle if the oil pump is weak. Using high-quality synthetic oil (5W-30 or 10W-40) and performing changes every 3,000–5,000 miles is essential. Some owners install a larger capacity oil pan or an oil cooler for added safety.

Timing Chain Life

Because the camshaft installation requires removal of the timing chain, it makes sense to replace the chain, guides, tensioner, and water pump at the same time. With proper maintenance, the timing chain should last the life of the engine. Avoid using cheap aftermarket timing components; stick with OEM or high-quality aftermarket parts.

Final Verdict: Is the JWT Stage 3 Camshaft Worth It?

For the Nissan 350Z enthusiast who seeks a naturally aspirated power increase with a distinctive exhaust note and a genuine track-focused personality, the JWT Stage 3 camshaft delivers. The verified 55 horsepower gain at the wheels transforms the car from a competent sports car into a genuinely quick machine that rewards high-RPM driving. The installation is not for the faint of heart, and the supporting mods are mandatory, but the results speak for themselves.

If you are building a weekend toy or a dedicated track car, the JWT Stage 3 camshaft is a strong investment that provides excellent value per horsepower. If you need a daily driver that remains docile in traffic, consider the Stage 2 variant or a mild cam from another manufacturer. In either case, JWT's engineering pedigree and the real-world data from this build confirm that the Stage 3 camshaft is a proven upgrade for the VQ35DE.

For further reading on installation guides and tuning discussions, the My350Z forum is an excellent resource where hundreds of owners have shared their camshaft build experiences. Also, consider contacting a reputable shop like Z1 Motorsports for parts and technical advice. With proper planning and execution, the JWT Stage 3 camshaft can be one of the most rewarding modifications you can make to your 350Z.