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JRZ Suspension Engineering is proud to offer our newest quadruple adjustable racing damper. the JRZ 14 31.  Building upon the years of success of our original quadruple adjustable. the 14 31 takes our damping philosophy to the next level.  Every adjustment has an increased damping force range with finer adjustments engineered to enable the chassis tuner to make significant. predictable changes every time. Compression and rebound adjustments are separated into the high speed and low speed piston velocity ranges affecting the bleed and blow off points of the damping curve. All oil flow paths in the JRZ 14 31 have been redesigned to maximize efficiency and give crisp feel to the driver.  Rebound valving has been completely redesigned to eliminate influence over compression forces and smooth pressure development. At the heart of the new JRZ 12 31 package is our latest motorsport piston. designed to give increased control over base characteristics. reduce hysteresis. and operate smoother.  To ensure that the valving designed into the JRZ 12 31 are the determining forces. JRZ has included new low friction coatings. seals and bearings with this package. Custom applications are available.  An easy to use system. the JRZ 14 31 enables the chassis tuner to achieve the desired mass control and handling with precision. Digressive high speed blow off adjustment allows for highly tuneable mass control while maintaining smooth response and without losing traction. The low speed bleed adjustment is a powerful tool that enables the chassis tuner to maximize grip and optimize vehicle balance.

Features:

• Rebound adjustment independent from compression
• Extra large adjustment range
• 12 clicks low speed compression
• 21 clicks high speed compression
• 8 clicks low speed rebound
• 15 clicks high

The result is a damper that provides ultimate chassis and ride height control with maximum mechanical traction. The JRZ standard 22 mm piston rod works in concert with the high speed valving to maximize blow off valve response. achieving solid chassis control without using a high spring rate. JRZ 14 31 dampers are shipped with 360 degree swivel hoses and are available with zero-inclusion quick disconnects for mounting canisters within the chassis for ease of adjustment accessibility.  Even with a large range. each adjustment is designed to be a small. even step giving precision and confidence when making changes.  Our newest motorsport piston has been developed to deliver a smooth and responsive damping characteristic.  To customize track to track setups and tailor the chassis to the driver; the JRZ 14 31 has an adjustment range able to provide damping to spring configurations ranging from 1.5-6Hz on vehicles with moderate to large aerodynamics loads.  The JRZ 14 31 is here to take you to the next level. Dedicated racing cars with experienced drivers deserving of the professional technology JRZ delivers. With valving designed and innovated by JRZ Suspension Engineering. the JRZ 14 31 is shipped as a custom configuration always tailored to the customer’s needs. and always comes with our world renowned personal service.

Benefits

• Precise control of the chassis and unsprung masses
• Easy to change damping curves
• Large adjustment range. with fine tuning ability

Learn More

JRZ Suspension Engineering is proud to offer our newest triple adjustable racing damper. the JRZ 12 31. Building upon the years of success of our original triple adjustable damper. the JRZ 12 31 takes our damping philosophy to the next level. Every adjustment has an increased damping force range with finer adjustments engineered to enable the chassis tuner to make significant predictable changes every time. Compression adjustments are separated into the high speed and low speed piston velocity ranges affecting the bleed and blow off points of the damping curve. All oil flow paths in the JRZ 12 31 have been redesigned to maximize efficiency and give crisp feel to the driver. Rebound valving has been completely redesigned to eliminate influence over compression forces and smooth pressure development. At the heart of the new JRZ 12 31 package is our latest motorsport piston. designed to give increased control over base characteristics. reduce hysteresis. and operate smoother. To ensure that the valving designed into the JRZ 12 31 are the determining forces. JRZ has included new low friction coatings. seals and bearings with this package. Custom applications are available. An easy to use system. the JRZ 12 31 enables the chassis tuner to achieve the desired mass control and handling with precision. Digressive high speed compression blow off adjustment allows for a stiff compression valving while maintaining smooth response and without losing traction. The low speed adjustment is a powerful tool that enables the chassis tuner to maximize grip and optimize vehicle balance. The result is a damper that provides ultimate chassis and ride height control with maximum mechanical traction. The JRZ standard large 22 mm piston rod works in concert with the high speed valving to maximize blow off valve response. achieving solid chassis control without using a high spring rate.

Features

• Rebound adjustment independent from compression
• Extra large adjustment range
• 12 clicks low speed compression
• 21 clicks high speed compression
• 24 rebound • High response piston
• Precise canister
• Low friction
• Adjustable gas pressure

JRZ 12 31 dampers are shipped with 360 degree swivel hoses and are available with zero-inclusion quick disconnects for mounting canisters within the chassis for ease of adjustment accessibility. Our newest motorsport piston has been developed to deliver a smooth and responsive damping characteristic.  To customize track to track setups and tailor the chassis to the driver; the JRZ 12 31 has an adjustment range able to provide damping to spring configurations ranging from 1.5-6Hz on vehicles with moderate to large aerodynamic loads. Even with a large range. each adjustment is designed to be small. even steps giving precision and confidence when making changes. The JRZ 12 31 is here to take you to the next level. Dedicated racing cars with experienced drivers deserve the professional technology JRZ delivers. With valving designed and innovated by JRZ Suspension Engineering. the JRZ 12 31 is shipped as a custom configuration always tailored to the customer’s needs. and always comes with our world renowned personal service.

Benefits

• Precise control of the chassis and unsprung masses
• Easy to change damping curves
• Large adjustment range. with fine tuning ability

Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

Cosworth stroker kits the perfect to displacement; torque power to your engine. Each includes select matched components from parts list ensuring reliable performance.
Mitsubishi 4B11 (Evolution X) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft (94mm)
Cosworth Forged Connecting Rods
Cosworth'ston Rings
Mitsubishi 4G63 (Evolution VII-IX) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft
(94mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings
Subaru EJ25 2.6L
Cosworth Forged Pistons (99.5mm)
Cosworth Fully Counterweighted Billet Crankshaft
(81mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

Cosworth stroker kits the perfect to displacement; torque power to your engine. Each includes select matched components from parts list ensuring reliable performance.
Mitsubishi 4B11 (Evolution X) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft (94mm)
Cosworth Forged Connecting Rods
Cosworth'ston Rings
Mitsubishi 4G63 (Evolution VII-IX) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft
(94mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings
Subaru EJ25 2.6L
Cosworth Forged Pistons (99.5mm)
Cosworth Fully Counterweighted Billet Crankshaft
(81mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More