Bosio DLC 764 Diesel Injector Nozzle (Single) — ULSD Rated, VW AHU/1Z/ALH

What it is
This is a single Bosio DLC 764 performance injector nozzle, manufactured by Fratelli Bosio, for VW VE-pump (mechanically injected) diesel engines. This listing is for one nozzle, not a set. Most VE/VP engines use 4 cylinders and require 4 nozzles — a separate "Set of 4" SKU exists for buying the full quantity at once.

Performance specs

• +25 hp, +50 wtq (over stock)
• 86% more fuel flow than the stock 90hp Bosch DSLA 150P 706 nozzle
• Supports total power outputs of 135–205 hp, with supporting modifications
• ULSD (ultra-low sulfur diesel) rated
• DLC-coated needle for wear resistance specifically with ULSD fuel

Design features

• Optimized hole geometry for improved flow
• Tighter manufacturing tolerances than stock
• Hardened wear surfaces
• Reduces exhaust smoke at equivalent power output versus stock nozzles
• Fuel economy can be adjusted at time of install
• Improves throttle response

Warranty — requires calibration
5-year unlimited-mileage warranty, but only when the nozzle is installed with KermaTDI's Injector Calibration Service. Installing without calibration is not covered under this warranty term as stated.

Why calibration matters
KermaTDI states this calibration service is the only way to properly set up new Bosio nozzles for correct performance — installing the nozzle without calibrating the injection pump to match is explicitly not recommended.

Fitment

• 1996–1997 VW B4 Passat, AHU or 1Z engine
• 1997–1999 VW Mk3 Jetta, AHU engine
• 1999–2003 VW Mk4 Golf, ALH engine
• 1999–2003 VW Mk4 Jetta, ALH engine
• 1998–2003 VW Mk4 New Beetle, ALH engine

Common questions

How many of these do I need for my car? Most VE-pump 4-cylinder TDI engines need 4 nozzles for a complete set. This SKU is priced and sold per single nozzle — check the separate "Set of 4" listing if you need the full quantity in one order.

Do I need to buy calibration separately, or is it included? Calibration is a separate service, not included in the nozzle price. KermaTDI recommends it as required for proper setup and for the 5-year warranty to apply.

Will this nozzle work without recalibrating my injection pump? Not recommended — KermaTDI states calibration is the only way to get correct performance from these nozzles, and the warranty is tied to installation with calibration.

Does this nozzle work with regular diesel or only ULSD? It's ULSD rated and built for it specifically — the DLC coating is designed for wear resistance with ULSD fuel.

What's the difference between this and the stock nozzle? 86% more flow than the stock 90hp Bosch DSLA 150P 706 nozzle, plus +25hp/+50wtq gains and tighter tolerances.