Blackline Porsche 944 / Audi A4 016 / 093 / 083 5 Speed Helical LSD Limited Slip Diff HLF181

Helical gear Limited Slip Differential suitable for selected Audi/Porsche 016 / 083 / 093 5-speed transmissions.

Suitable Applications

• Porsche 924 Turbo (931) – Type 016 – 1979–1983 – 125 kW to 130 kW

• Porsche 944 Base – 016J / 016K – 1982–1987 – 120 kW

• Porsche 944 Late Base – 016R / 016S – 1988–1989 – 118 kW to 121 kW

• Porsche 924 S – 016J – 1986–1988 – 110 kW to 118 kW

• Porsche 944 S – 016R – 1987–1988 – 140 kW

• Porsche 944 S2 – 083F / 083J – 1989–1991 – 155 kW

• Porsche 944 Turbo (951) – Type 083 – 1985–1988 – 162 kW

Important Fitment Information

This differential is designed as a replacement for applications originally fitted with a standard open differential.

It is not a direct fit for models originally equipped with an LSD or differential oil cooler.

Porsche 944 Turbo S / Late Turbo

For Porsche 944 Turbo S / Late Turbo Type 083 models from 1988–1991 (184 kW) which were originally fitted with an LSD/oil cooler system, modification is required.

The factory oil-pump drive gear must be removed and the transmission converted to use the standard open-differential style drive gear before this differential can be installed.

Please Note

Not suitable for any other gearbox type fitted to these vehicles.

Please confirm your gearbox/transaxle code before ordering. Vehicle model and year alone are not sufficient to guarantee compatibility. 

Please Check Fitment is correct before purchasing!

Helical LSD Advantages:-

• Equal rotational speed to both wheels
• Torque distributed according to traction
• Minimal service requirements - no clutches
• Quick reaction compared to viscous LSDs
• Gentle and progressive engagement, low noise
• Easily controlled power take-off and drifting
• Gears and body manufactured from 8620 alloy steel
• Direct replacement into stock differential

Blackline Helical LSD's - How They Work

The Blackline helical LSD's are torque biasing, that is they distribute torque between the wheels, loading more torque towards the wheel with the best traction thus improving performance and driveabitily. Especially in low grip situations.

The helical gearing manages the distribution of friction within the LSD. When torque is applied to the helical gear system it creates force that pushes the gear into the differential body, thus creating friction. Increases of torque, increases the thrust force directly proprotional to the amount of torque. This allows the Blackline LSD to cope with considerable traction imbalance even under heavy power conditions, as would be the case on exiting a powered up corner. But at low torque conditions the LSD can differentiate quietly and smoothly, thus making the differential very suitable for normal road driving. The Blackline LSD uses the popular parallel axis helical geared configuration optimised for even load distribution. They are designed with a torque bias of 5:1 this means that if  one wheel loses traction then the wheel with the most grip can receive five times as much torque as the wheel that is slipping. However, five times zero is still zero, so all these helical LSD's work best when both wheels are 'planted' and some traction is still available on the slipping wheel. In practice this is rarely a problem as there is always some 'drag' on the slipping wheel, however some drivers expertly use left foot braking to partially lock the spinning wheel.

Note - Helical LSD's work especially well when combined with modern anti-lock braking systems.

You are buying the Assembled differential unit only, no bearings, gears or gaskets will be included.