Main Jet DGV, DFV, ICT EPC 150

OVERVIEW

Precision tuning is the heartbeat of a high-performance air-cooled engine, and the EMPI 150 Main Jet is the professional''s choice for mastering the fuel-to-air ratio in your Weber or EMPI carburetor. When you are pushing your Volkswagen through the gears, the main jet takes over from the idle circuit to provide the necessary fuel flow during mid-to-high RPM operation. A jet that is even slightly off can lead to a lean condition that causes overheatingthe ultimate enemy of the air-cooled heador a rich condition that fouls plugs and wastes power. This .150 sized jet is meticulously manufactured to ensure consistent flow rates, allowing you to dial in your 32/36 DGV progressive, 32/36 DFV, or 34 ICT series carburetors with absolute confidence. Whether you are building a torquey 1776cc street engine or maintaining a reliable 1600cc stocker, having the correct main jet is non-negotiable for engine longevity.

At Appletree Auto, we know that no two VW engines are identical; factors like displacement, camshaft profile, and even local humidity play a massive role in how your engine breathes. This EMPI main jet is engineered from high-quality brass to resist corrosion and maintain its internal diameter over years of exposure to modern fuel blends. It is designed to fit seamlessly into the jet stacks of DGV, DFV, and ICT/EPC carburetors, making it a versatile component for the most popular carburetor upgrades in the VW world. By choosing genuine EMPI tuning components, you are ensuring that your carburetor reacts predictably to adjustments. Don''t settle for "close enough" when it comes to your fueling; use the exact size required to achieve that crisp throttle response and the chocolate-brown spark plug color every air-cooled enthusiast strives for.

FITMENT

This main jet is designed for use with the following carburetor models and is commonly found on these Volkswagen applications:

• Compatible Carburetors: Weber 32/36 DGV, Weber 32/36 DFV, Weber 34 ICT, EMPI 34 EPC, and Holley 5200 series.
• VW Beetle (Type 1): 1950-1979 (With upgraded progressive or dual ICT carburetors).
• VW Bus / Transporter (Type 2): 1950-1979 (Bay Window and Split Window models).
• VW Karmann Ghia: 1956-1974.
• VW Thing (Type 181): 1973-1974.
• VW Squareback, Fastback, Notchback (Type 3): 1961-1973.
• Custom Applications: Sand rails, buggies, and trikes utilizing upright or pancake air-cooled engines.

SPECS

• Jet Size: 150 (1.50mm orifice diameter).
• Material: High-quality machined brass for thermal stability and corrosion resistance.
• Thread Type: Precision-cut threads for a secure fit in the jet stack.
• Compatibility: DGV, DFV, ICT, and EPC series carburetors.
• Part Number: 73801.150.
• Manufacturer: EMPI.
• Sold As: Individually (1 per pack).

PRO TIPS

Tip 1: Use the "Plug Chop" Method for Accuracy. To verify if the 150 main jet is correct for your specific engine, perform a plug chop. Accelerate onto a flat stretch of road, hold a steady throttle in third or fourth gear at about 3,500 to 4,000 RPM for 30 seconds, then immediately turn off the ignition and pull over (safely). Remove a spark plug and inspect the porcelain insulator. You are looking for a light tan or "coffee with cream" color. If it is white, you are lean and may need a larger jet; if it is black or sooty, the 150 may be too rich for your current venturi and air corrector combination.

Tip 2: Altitude Adjustments are Key. Remember that as you go up in elevation, the air becomes less dense. If you are tuning your VW in a high-altitude area like Denver, you will generally require a smaller main jet than someone tuning at sea level in Florida. If your engine feels sluggish and "heavy" at high altitudes with a 150 jet, you might be running too rich. Always keep a small assortment of jets in your glovebox tool kit to account for significant changes in elevation during long-distance VW treks.

Tip 3: Never Clean Jets with Metal Wire. Brass is a relatively soft metal, and the precision-drilled hole in this .150 jet is critical to its function. If you suspect a clog from fuel debris, never use a sewing needle or a piece of wire to poke it out, as this will gouge the brass and permanently change the flow characteristics of the jet. Instead, use pressurized carburetor cleaner and compressed air. If the clog persists, soak the jet in a solvent bath to dissolve the varnish without damaging the internal bore.