Volkswagen Scirocco 2.0 TSI CAWB Stage 2 (200PS / DSG 6) - Reviews | MED17.5

Hello!

I am interested in this package. You have mentioned an upgraded fuel pump - the LPFP I would guess? Or is the Stage 3 converted to work with the upgraded Hitachi HPFP?

Nickel said:

Hello!

I am interested in this package. You have mentioned an upgraded fuel pump - the LPFP I would...

Click to expand...

Great question! For the CAWB 2.0 TSI on a K04 Stage 3 build, both pumps are worth discussing, but the primary concern is the HPFP (High Pressure Fuel Pump).

Here's the breakdown:

HPFP (High Pressure Fuel Pump)
The stock Hitachi pump on the CAWB is known to run out of capacity at higher boost levels with the K04. The most common upgrade path is:

• Autotech internals (drop-in piston upgrade for the stock Hitachi housing)
• Or a full Hitachi HPFP upgrade unit (sometimes referenced as the RS3/TTRS pump swap, depending on the generation)

This is critical for Stage 3 — without adequate high-pressure fuel delivery, you'll hit fuel cut under high load/high RPM, which is both dangerous for the engine and will limit power output significantly.

LPFP (Low Pressure Fuel Pump / In-tank pump)
On most CAWB K04 builds, the stock LPFP is adequate up to roughly 350–380 PS territory. However, if you're pushing the K04 hard or planning E85/flex fuel in the future, upgrading the LPFP (e.g., a Walbro 450 or DeatschWerks DW300C drop-in) is good insurance to maintain consistent feed pressure to the HPFP.

Regarding the calibration itself:

The product listing states "requires an upgraded fuel pump and injectors" but doesn't specify whether the Stage 3 map's fuel tables are calibrated for a specific HPFP upgrade or specific injector size. This is important to clarify before flashing — you need to know:

• Which HPFP the map was calibrated against (stock with Autotech internals? Full upgrade?)
• Which injectors (stock CAWB injectors, or upgraded — e.g., EA888 Gen3 injectors, or aftermarket?)
• Target fuel pressure values in the map

Since the file is listed as "Project state: in development" and was modified by B&C Consulting (Bruno) via EVC, I'd recommend confirming the exact hardware spec the Stage 3 was calibrated for — either through the seller or by checking the fuel pressure request maps and injector constant values in the bin directly with a tool like WinOLS.

Don't flash the Stage 3 until your hardware matches the calibration assumptions exactly. A mismatch in injector flow rate or fuel pressure targets can result in a dangerously lean condition at full load.