MFactory Helical Limited Slip Differential for F/H Series

MFactory Helical Limited Slip Differential - Honda F/H Series (Accord/Prelude)

Running a Prelude or Accord at the track and spinning one wheel coming out of corners? Your stock open diff's sending all the power to whichever wheel has less grip. The MFactory helical LSD splits power between both wheels so you're actually putting power down instead of lighting up one tire. They work and they don't need constant rebuilds like clutch-type LSDs. Your stock open diff sends 100% of power to the wheel with the least traction. That's why you're one-wheel-pegging it and going nowhere. The MFactory helical LSD can transfer up to 75% of torque to the wheel with more grip. You're getting way better corner exit traction and you're not wasting power spinning one wheel.

Here's Why Open Diffs Suck for Track Use

Your stock F or H series diff is an open differential. When you're cornering hard and one wheel lifts or loses traction, all the power goes to that wheel. The wheel with traction gets nothing. You're spinning the inside wheel and the car's not accelerating. An open diff works fine for street driving where you're not pushing the car, but on track it's useless. Every time you're trying to put power down coming out of a corner, you're spinning one wheel and your lap times suffer. The MFactory helical LSD uses gear geometry to split power between both wheels based on which wheel has more traction. When one wheel starts to slip, the diff transfers torque to the other wheel automatically. No clutch packs, no preload springs, just gears doing their thing. You get predictable power delivery and way better corner exit speed.

Helical LSD vs. Clutch-Type LSD

Most aftermarket LSDs are clutch-type (like Cusco or OBX). They use clutch packs that wear out and need rebuilds every few years. You're also supposed to run special diff fluid with friction modifiers. The MFactory helical LSD uses gears instead of clutches. There's nothing to wear out and you don't need special fluids. Just run regular gear oil and forget about it. I've got 5+ years and probably 100+ track days on my MFactory diff and it still works like new. Clutch-type diffs also change your steering feel because they bind up under certain conditions. The helical diff doesn't bind, so your steering feels normal.

Forged Japanese Steel, Not Cast

The MFactory diff's made from forged Japanese SAE 4320 and SAE 9310 steel. That's way stronger than cast steel or cheap Chinese forgings. The gears are double-tempered and cryogenically treated (super sub-zero treatment) for extra toughness. MFactory also shot-peens the gears to increase surface hardness. The diff's designed to handle drag racing shock loads, so it'll survive anything you throw at it on a road course or autocross. The gear geometry's designed to minimize parasitic drivetrain losses. MFactory claims their diffs transfer 1-2% more power to the wheels than competitors' diffs. That's not a huge number, but every bit helps when you're chasing lap times.

What You Get

• MFactory helical limited slip differential
• Forged Japanese SAE 4320/9310 steel construction
• Double-tempered and super sub-zero treated
• Shot-peened gears for increased surface hardness
• Up to 75% torque transfer to one wheel
• No clutch packs (maintenance-free)
• Works with standard gear oil (no special fluids)
• No steering bind or adverse effects
• Brighton-Best hardware included
• Lifetime globally transferable warranty

Fits Your Car

1990-2002 Honda Accord:

• 1990-1993 Honda Accord (F22A engine, M2F4/M2S4 transmission)
• 1994-1997 Honda Accord (F22B engine, M2Y4/P2A4 transmission)
• 1998-2002 Honda Accord (F23A engine, P2A5/P2A8 transmission)

1992-2001 Honda Prelude:

• 1992-1996 Honda Prelude Si (H23A engine, M2U4/M2U5 transmission)
• 1992-1996 Honda Prelude VTEC (H22A1 engine, H2U4/H2U5 transmission)
• 1997-2001 Honda Prelude VTEC (H22A4 engine, H2A5/P2U5 transmission)

Compatible Engines

• F22A (1990-1993 Accord)
• F22B (1994-1997 Accord)
• F23A (1998-2002 Accord)
• H22A1 (1992-1996 Prelude VTEC)
• H22A4 (1997-2001 Prelude VTEC)
• H23A (1992-1996 Prelude Si)

Compatible Transmissions

• H2A5 (5-speed manual, 1997-2001 Prelude VTEC)
• H2U4 (5-speed manual, 1992-1996 Prelude VTEC)
• H2U5 (5-speed manual, 1992-1996 Prelude VTEC)
• M2F4 (5-speed manual, 1990-1993 Accord)
• M2S4 (5-speed manual, 1990-1993 Accord)
• M2U4 (5-speed manual, 1992-1996 Prelude Si)
• M2U5 (5-speed manual, 1992-1996 Prelude Si)
• M2Y4 (5-speed manual, 1994-1997 Accord)
• P2A4 (5-speed manual, 1994-1997 Accord)
• P2A5 (5-speed manual, 1998-2002 Accord)
• P2A8 (5-speed manual, 1998-2002 Accord)
• P2U5 (5-speed manual, 1997-2001 Prelude VTEC)

Note: This LSD does NOT fit 1997-2001 Prelude SH models with the factory ATTS (Active Torque Transfer System) LSD. The Prelude SH came with a factory mechanical LSD and uses a different differential case. This MFactory LSD only fits Prelude models that came with an open differential from the factory. Installation requires pulling your transmission and opening the diff. If you've never done diff work, get a shop to install it.