Should I choose the 1.5-way or the 2-way?

Both share the same construction and the same 6.5 kg cold initial setting, and the manufacturer rates both for use from the street to the circuit. They differ in cam angles, 45-25 for the 1.5-way and 45-45 for the 2-way. Bulletproof Automotive can help match the choice to how your car is driven.

How noisy is the High Traction LSD for AP1 cars on the street?

The High Traction LSD for AP1 and AP2 cars was developed with quietness in mind. The manufacturer says it suppresses the chattering, cracking noise mechanical differentials can make on the street as far as possible without reducing locking effect, helped by newly developed RS clutch plates.

Is a higher initial torque always better?

No. The manufacturer calls the idea that differential strength equals initial torque a misconception. Its design relies on the locking characteristic of the differential itself, generating lock in proportion to throttle input, so the driver feels a consistent, stable response through the corner.

What differential oil should I use?

A fully synthetic differential oil is recommended. The manufacturer warns that performance can change markedly depending on the oil used, so choose a quality synthetic and follow the factory service manual for the fill and change procedure on your S2000.

Has this differential been raced?

Yes. The manufacturer developed it through actual racing and uses it in its own S2000 in the Super Taikyu endurance series. It reports the differential in use from street driving to endurance racing in Japan and abroad, valued for consistent locking, quietness and durability.

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Description

J’s Racing High Traction LSD for AP1 / AP2 Honda S2000

J’s Racing’s High Traction LSD for AP1 and AP2 S2000s is the mechanical limited-slip differential the Osaka tuner developed through racing and runs in its own Super Taikyu S2000. Offered in 1.5-way and 2-way form, it avoids the vibration, noise and unsettled behavior that large-plate differentials often show, delivering a predictable lock that builds with throttle, so the rear stays composed from tight turns to fast corners. It is a strong choice for an S2000 that sees circuit days or endurance events; a car that never leaves the street will gain less for the cost and the installation work.

Construction

J’s Racing has used disc springs since the differential first went on sale, because their response can be shaped: a disc spring holds a steady force at small deflection, then rises or falls past a set point. Newly developed RS clutch plates, made by a special process, transmit drive more effectively while staying quiet. The case is forged from selected material and quality controlled to 1/100mm, and the pinion and side gears use high-strength gear steel with special heat treatment.

Features

Mechanical LSD offered in 1.5-way and 2-way versions
Initial torque of 6.5 kg, measured cold
Disc-spring design for smooth, predictable lockup
RS clutch plates for strong drive transfer and quiet running
Forged differential case able to handle high-power cars
Heat-treated high-strength pinion and side gears

Applications

Honda S2000: AP1 | 1999-2003 | 2.0L F20C
Honda S2000: AP2 | 2004-2009 | 2.2L F22C

Notes

Options: the 1.5-way uses 45-25 cam angles and the 2-way uses 45-45, with the same construction and 6.5 kg cold initial setting
A fully synthetic differential oil is recommended because oil choice can change performance markedly
Keep the factory service manual on hand and follow its procedures during installation
Stop in a safe place and inspect the car if unusual vibration or noise appears while driving
Pair it with the Final Gear Set for the AP1 / AP2 Honda S2000 when the differential is open
Sourced to order from J’s Racing in Japan; Bulletproof Automotive confirms availability and lead time through J’s Racing USA

Frequently Asked Questions

Should I choose the 1.5-way or the 2-way? Both share the same construction and the same 6.5 kg cold initial setting, and the manufacturer rates both for use from the street to the circuit. They differ in cam angles, 45-25 for the 1.5-way and 45-45 for the 2-way. Bulletproof Automotive can help match the choice to how your car is driven.
How noisy is the High Traction LSD for AP1 cars on the street? The High Traction LSD for AP1 and AP2 cars was developed with quietness in mind. The manufacturer says it suppresses the chattering, cracking noise mechanical differentials can make on the street as far as possible without reducing locking effect, helped by newly developed RS clutch plates.
Is a higher initial torque always better? No. The manufacturer calls the idea that differential strength equals initial torque a misconception. Its design relies on the locking characteristic of the differential itself, generating lock in proportion to throttle input, so the driver feels a consistent, stable response through the corner.
What differential oil should I use? A fully synthetic differential oil is recommended. The manufacturer warns that performance can change markedly depending on the oil used, so choose a quality synthetic and follow the factory service manual for the fill and change procedure on your S2000.
Has this differential been raced? Yes. The manufacturer developed it through actual racing and uses it in its own S2000 in the Super Taikyu endurance series. It reports the differential in use from street driving to endurance racing in Japan and abroad, valued for consistent locking, quietness and durability.

About J’s Racing

J’s Racing was established in Osaka in 1989, as VTEC engines and lightweight Civics and Integras were changing what a Honda could do, and it has built parts for Hondas ever since. The company develops engine response, suspension, braking, cooling and aerodynamics together as one system, then proves the parts in time attack, gymkhana, endurance and circuit racing. Its Fit lapped Tsukuba Circuit in 1’00.459, and its naturally aspirated AP1 S2000, the Maou car, became the company’s reference build for the Honda roadster. Every J’s Racing part is designed and tested in Japan, and J’s Racing USA in Carson, California handles distribution in the United States.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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