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QR25 Fully Counterweighted and Knife Edged Crankshaft GEN 1 - QR25DE Will need to be turned/polished (journals)

Normally reserved for racing applications, a knife edged crankshaft can help the engine produce more horsepower. Removing this material and bringing it to a sharp edge does a couple of things. First, knife edging can often remove pounds of weight. Less weight equates to a rotating assembly that spins with less resistance, and this in itself is responsible for some gains in horsepower.

The counterweights on a Stock Nissan crank is flat on the ends. As the crankshaft rotates, these counterweights come into direct contact with the engine's oil. This contact creates friction and splashes oil all over the bottom end of the engine. A knifed edged crankshaft actually glides through the oil much easier and encounters far less friction. Anytime friction can be reduced in an engine's rotating assembly or valvetrain, additional horsepower gains are realized. Excellent for turbo or NA applications.

IN STOCK NOW!

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Boundary QR25DE Billet Oil Pump Gear Set Boundary oil pump gears are 100% manufactured in our Dallas, Texas production facility. We start by quenching our chromoly billets from extreme heat and then temper it to tough indestructible core. After machining we apply our ColdFlow surface hardening process and complete it to a Mirror Finish. What does all this give you? It gives you a pump with stability over 9000 RPM, proven in excess of 900whp, with higher efficiency, less friction, and backed by one of the industries best warranty’s. Oil Pump Gear Features Mirror Finished and Surface Hardened Surface Ground gears for the ultimate in fitment and performance Indestructible core Inner and outer gear set included Unique race inspired gerotor design Symmetrical tooth profile elemenates the gears weak spot making our gear sets indestructible Each set hand, machine, and hardness inspected with Blueprinting Report Learn More

Gen1 Signal Wheel for B16 Crank with Bolts Signal wheel to install a B16 Crankshaft or 2JR Knife-edged Crankshaft in a Gen1 QR25 (2002-2006). Complete OEM kit with Bolts Learn More

Complete Engine timing kit for the Gen 1 QR25DE motor (2002-2006) - fits all Gen 1 QRs OEM Nissan Parts include 1. Left and Right Guide Rails 2. Chain Tensioner 3. Main Chain 4. Exhaust Sprocket 5. Lower Main Sprocket 6. Orings for Upper Pan, Front Cover and Timing Cover Does not include Intake Cam Sprocket/Phaser (can be purchased separately) or the lower chain for the balance shafts - we suggest adding the BSR Kit Learn More

These Pro series flywheel bolt kits from ARP give you all that you need to bolt in your flywheel with confidence. They're much stronger than OEM hardware, are forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature an exclusive, flat 12-point head design and a larger-than-stock shank diameter for increased strength and improved flywheel register. Fits all QG/SR flywheels, stock and aftermarket.

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QR25DE Hitachi OEM Coil Pack Set (4) 02-06

Complete set (4 included) of OEM Hitachi Coil Packs for your Gen 1 QR - fits all models Sentra/Altima/Frontier with the Gen1 QR engine (02-06)

12 Month / 12k Mile Warranty fr.

• Hitachi ENSURE FAST STARTS: this Hitachi Ignition Coil ensures fast starts, consistent engine performance, and optimized fuel efficiency. The coil is OE-engineered for a streamlined path to the spark plug and reduced shorts, and it eliminates the need for spark plug wires. High-quality wire coating ensure resilient, long-lasting functionality and minimal current fluctuation
• ENSURE EFFECTIVE COMBUSTION: the Hitachi Ignition Coil delivers optimal combustion and consistent, high-energy ignition output. These Hitachi Ignition Coils, also known as engine coils or spark plug coils, deliver the highest in durability and operational performance. Designed for exacting fitment and connectivity, you can install the Hitachi Ignition Coils with OE-confidence
• RELY ON PROVEN DURABILITY: Hitachi coil designs are developed in their test lab and proven tough at extreme conditions that are far beyond any operational environment that a vehicle would experience. Gold-plated connectors prevent corrosion

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Supertech Block Guard for the Nissan QR25DE is designed to strengthen the engine block for high hp levels. It provides support to highly stressed cylinder walls but still allow maximum water cooling. This helps stop damaging cylinder hot spots. Made from high strength/ low weight 6061 aluminum alloy, and CNC machined for easy installation. For QR25DE Engines CNC Machined 6061 Aluminum Alloy Learn More

Hitachi Oil Pump and Timing Cover Assembly for the 02-06 QR25DE (does not fit B16 models)

• Original Equipment Supplier
• Easy installation with a factory quality fit
• Modular design
• Long service life
• Flow-optimized system design

2JR offers an option for a complete set of OEM Orings needed for the install (these come with the 2JR Rebuild Kit)

• (2)pcs - 15066-3Z000
• (1)pcs - 15066-3Z001
• (1)pcs - 15066-3Z002
• (1)pcs - 15066-3Z003
• (1)pcs - 15066-3Z005

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Brian Crower QR25 Titanium Valve Spring Retainer Set 2JR Ti Retainers - full set (16) Ti-17 Alloy Extremely durable, machined to exacting tolerances and available in stock size to fit 2JR and JWT valve springs. The old saying goes; “a chain is only as strong as it’s weakest link.” This is so true of your valve train. Don’t ignore this part in your valve train set up – it can make all the competitive difference! Features: Heat treated Titanium material for maximum strength Impingement surface enhancement process 3-4 grams lighter than OEM Fits ALL QR25 engines, all years and models. Fits on stock springs, 2JR springs and JWT Springs. Uses OEM keepers Learn More

If your QR suffers from chain rattle at start up when cold, the issue more than likely is a bad intake sprocket phaser. This can lead to jumped timing, bent valves, broken chains and/or broken main crank sprockets. 2JR offers new cam phaser sprockets. We have these in stock! Do not wait to replace your sprocket and risk an engine failure. Learn More

Fits all QR25 Engines (all years/models) Each K&N Performance Gold Oil Filter comes with a 1” nut welded to the top of the canister so they can be easily wrenched-off with a standard tool. K&N Performance Gold Oil Filters use resin impregnated cellulose filter media. This allows for higher flow rates while providing outstanding filtration. High filter flow rates are important in racing vehicles where heavier grade oil is used and the oil is pumped much faster than in a standard vehicle. When the engine is circulating oil at high GPM rates, the high-flow oil filter helps reduce the loss of pressure through the filtering process. FEATURES * Drilled safety wire holes for racing in canister oil filters * Sturdy 1" (automotive) or 17 mm (motorcycle) wrench nut, where applicable, makes oil filter removal quick and easy * Heavy-duty construction * Resin-impregnated filter media provides maximum filtering surface for contaminant removal * Anti-drainback valve (where applicable) eliminates dry starts, prevents oil from draining back into crankcase during engine shutdown * Internally lubricated gasket provides positive seal while allowing easy on and off of filter * Rolled threads provide extra protection against stripping Learn More

QR25 Fully Forged Turbo Short Block built with 89.5mm Wiseco Dished Pistons with hard moly coated skirts, 2JR H Beam Forged Rods, ARP Rod Bolts and OEM Nissan Crank. Machined with ACL bearings, new OEM mains. Ready to drop in. Just add your head or a fresh 2JR head with 2JR valve springs for $599 more. Good for NA Builds and Turbo Builds up to 400whp. Excellent durability against detonation and extreme use. 1. 2JR 89.5mm Wiseco Dished Pistons with hard moly coated skirts 2. 2JR Forged H-Beam Rods 3. ARP Rod Bolts 4. OEM Crankshaft 5. ACL Bearings Optional: 2JR QR25DE Sleeved Block Darton MID Sleeves, installed. The stock block tends to crack the liner after 400whp. These blocks are good to over 700whp while the Darton MID Sleeves are made of ductile iron and are able to hold over 1000hp. The sleeves are unfinished and will need to be honed to match your piston size. Benefits: Cast iron performance in an aluminum block Improved block integral strength Improved cooling Learn More

2JR High Performance Short Block built with 89.5mm 2JR Turbo cast pistons with hard anodized tops, 2JR I Beam Forged Rods, ARP Rod Bolts and OEM B15 SpecV Crank. Machined with ACL bearings, new OEM mains. Ready to drop in your 02-06 B15! Just add your head or a fresh 2JR head with 2JR valve springs for $599 more. Good for NA Builds and Turbo Builds up to 350whp. 1. 2JR Stock Comp Turbo Hard Anodized Pistons 2. 2JR Forged I-Beam Rods 3. ARP Rod Bolts 4. OEM B15 SpecV Crank 5. ACL Bearings Learn More

Now available! For the B15 or B16. .030" standard thickness, 89mm bore size. Custom sizes available but take several weeks to produce. Using 1mm oversize pistons, choose 90mm bore size. Provide maximum sealing performance for today’s high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flouroelastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements. Learn More

These ARP main studs are made from 8740 chromoly steel and have a 190,000 psi tensile-strength rating. They are precision centerless-ground and thread-rolled to Mil-S-8879 specs, with a black oxide finish for corrosion resistance. The kits come complete with hardened washers and high-strength hex nuts.

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Application: QR25DE - All years / Models (b15, b16, altima, rogue)

Pro series cylinder head studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 200,000 psi for the 8740 material and 220,000 psi for ARP2000. ARP Pro series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.

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These Pro series flywheel bolt kits from ARP give you all that you need to bolt in your flywheel with confidence. They're much stronger than OEM hardware, are forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature an exclusive, flat 12-point head design and a larger-than-stock shank diameter for increased strength and improved flywheel register. These bolts will only fit Forged Steel Flywheels - will NOT fit aluminum flywheels (JWT, Fidanza). Will NOT fit OEM B15 Flywheels - use OEM bolts for these. Only fits Forged Steel Flywheels. Not OEM, JWT, Fidanza

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AC Delete Kit (Non-OEM) Fits all years, QR25 (02 and up) - removes the AC compressor and replaces it with free spinning pulley, bracket and hardware (included). NO NEW BELT CHANGE REQUIRED. Uses same size as stock belt. Free up some HP, less drag on the QR. Learn More

Brian Crower High RPM Valve Springs - QR25DE (all models) * Valvesprings Designed for high rpm, Brian Crower valve springs are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures (chamfer, debur, etc...) for consistent pressures over long term, high rpm usage. Quality valve springs are critical in the prevention of premature valve float. * Retainers The ultimate in lightweight high performance, Brian Crower titanium retainers typically weigh in approximately 40% less than the factory OEM steel units. CNC machined for premium 6AL4V titanium bar stock to exacting tolerances. * Spring/Retainer Kits Brian Crower valve spring and titanium retainers kits are system matched to work in unison to deliver better valve control at extended rpm's and allow for greater lift camshafts for added performance and reliability. Fits all QR25DE models 2002 - 2013 ALTIMA 2005 - 2012 FRONTIER 2008 - 2012 ROGUE 2002 - 2012 SENTRA 2005 - 2006 X-TRAIL Learn More