Software-Based Oil Pressure Modification in VAG 1.5 TSI and 2.0 TSI Engines

Modern 1.5 TSI, 1.5 eTSI, 2.0 TSI and 2.0 TFSI engines used by the VAG Group are equipped with electronically controlled variable-output oil pumps. During light-load driving, the system may operate in a lower-pressure range, while the higher-pressure stage is activated only after the conditions programmed into the engine control unit have been met.

This solution helps reduce internal resistance, fuel consumption and CO₂ emissions. From the perspective of long-term operation, however, another issue appears: the engine may be heavily loaded at very low RPM while the oil pump is still operating according to a strategy focused mainly on efficiency and emissions.

Software-based modification of the oil-pump operating strategy, also referred to as an oil pressure fix, is not designed to increase engine power. Its purpose is to activate the higher-pressure range earlier and increase the safety margin of the lubrication system when the engine is operating under load.

How Does a Variable-Output Oil Pump Work?

Many 1.5 TSI and 2.0 TSI engines use an oil pump that operates in several output ranges. The engine control unit changes the pump’s operating mode by controlling the oil-pressure regulation valve. In VAG technical documentation, this valve is often identified as N428.

The ECU takes into account factors including:

• engine speed,
• current engine load and requested torque,
• engine-oil and coolant temperature,
• accelerator-pedal position,
• transmission operating conditions,
• the factory emissions and fuel-consumption strategy.

Different pressure values and switching thresholds are used depending on the engine design, oil pump and software version. In practice, a lower pressure range of approximately 1.2–1.5 bar and a higher range of approximately 3.0–3.5 bar may be encountered.

These values are not identical for every engine. Actual oil pressure depends on oil temperature, engine speed, engine load, engine design and the current pump operating mode.

Why Does the Manufacturer Reduce Oil Pressure?

The oil pump takes power directly from the engine. The greater the output and pressure it must maintain, the greater the mechanical resistance it generates. Reducing pump output during light-load driving helps lower fuel consumption and emissions.

The concept itself is not incorrect. The problem appears when the pump strategy is combined with automatic-transmission software that shifts into high gears very early and keeps the engine operating at approximately 1,100–1,300 RPM.

During steady-speed driving, this does not always create a problem. The situation is different when the driver accelerates, drives uphill or loads the engine without the transmission downshifting first.

The engine must then produce high torque at a low rotational speed. Loads on the crankshaft, bearings, pistons, connecting rods and turbocharger increase while the lubrication system may still remain in its lower operating range.

What Does the Software Modification Involve?

The modification does not involve mechanically altering the oil pump or installing additional components. The change is made in the software of the engine control unit.

Depending on the ECU and its operating strategy, it may be possible to:

• switch the pump to the higher-pressure range earlier,
• maintain the higher-pressure range over a wider area of engine operation,
• change the load conditions required for pump switching,
• reduce the delay between rising engine load and activation of higher oil pressure,
• adapt the lubrication strategy to increased torque after a performance modification.

There is no single universal file suitable for every 1.5 TSI or 2.0 TSI engine. Vehicles that appear identical may use different engine codes, oil pumps, control units, hardware versions and software versions.

What Does Earlier Activation of Higher Oil Pressure Achieve?

The objective is to provide more favourable lubrication conditions when the engine is operating under increased load, particularly at low engine speed.

Changing the oil-pump strategy affects the operating conditions of components including:

• main bearings and connecting-rod bearings,
• the crankshaft,
• camshafts,
• hydraulic valve-clearance adjusters,
• the variable valve-timing system,
• the hydraulic timing-chain tensioner,
• the turbocharger,
• other components lubricated with pressurised oil.

Engine oil does more than reduce friction. It creates a protective film between cooperating surfaces, removes heat and protects components during sudden increases in load.

The software modification does not make the engine indestructible. It does, however, increase the lubrication-system safety margin in operating areas where the factory calibration represents a compromise between durability, emissions and fuel economy.

Low Engine Speed and High Engine Load

One of the least favourable operating conditions for a modern turbocharged engine is hard acceleration from very low RPM without a downshift.

At approximately 1,100–1,300 RPM:

• the oil pump is rotating relatively slowly,
• the crankshaft and bearings are heavily loaded,
• the turbocharger begins building boost rapidly,
• loads on the connecting rods, pistons and crank mechanism increase,
• the transmission may hold a high gear for too long.

In direct-injection petrol engines, these operating conditions may also promote undesirable combustion phenomena, including LSPI. This does not mean that every instance of low-RPM driving immediately damages the engine. The problem is repeatedly demanding high torque without an appropriate downshift.

Why Combine This Modification with Shift Points Calibration?

The engine and transmission should not be analysed separately. They form one powertrain system in which the transmission strategy directly affects engine load.

Factory DSG transmissions often:

• shift into higher gears very early,
• hold sixth or seventh gear at low road speeds,
• allow the engine to operate below 1,300 RPM,
• delay downshifts for too long when the accelerator is pressed gently,
• require deeper accelerator input before downshifting.

Changing the oil-pump strategy improves lubrication conditions, but it does not remove the cause of the engine operating at excessively low RPM. For this reason, the best result in many vehicles comes from combining:

• software-based modification of the oil-pump strategy in the engine ECU,
• individual Shift Points calibration in the transmission control unit.

After proper calibration, the transmission downshifts earlier, avoids forcing the engine to produce high torque at extremely low RPM and keeps the engine in a more favourable operating range.

The aim is not to keep the engine at unnecessarily high RPM. Shift points are calibrated to improve vehicle response, operating refinement and mechanical conditions without sacrificing everyday driving comfort.

Oil Pressure Modification After Stage 1 or Stage 2

After engine power and torque have been increased, the engine reaches higher loads at lower RPM. If the transmission continues to hold 1,100–1,300 RPM, loads on the bearings and the entire crank-and-piston assembly increase.

For this reason, when preparing a vehicle for increased performance, we do not analyse only boost and torque maps. We also verify how the entire powertrain works together.

Depending on the vehicle, we analyse factors including:

• the oil-pump operating strategy,
• transmission shift points,
• torque limitations in the transmission controller,
• engine-oil temperature,
• the engine’s mechanical condition,
• actual operating parameters under load.

Increasing power without analysing the engine, transmission and lubrication system is an incomplete solution.

Which Engines Can Be Modified?

The possibility of performing the modification depends on the engine code, oil-pump design, ECU and exact software version.

The solution may apply to selected engines from the following families:

1.5 TSI and 1.5 eTSI – EA211 EVO

EA211 EVO engines are used in many Audi, Volkswagen, Škoda, SEAT and Cupra models. Depending on the version, they may be equipped with ACT cylinder deactivation, eTSI mild-hybrid technology and different ECUs and software.

Example engine codes include:

• DADA,
• DACA,
• DPCA,
• DFYA,
• DFYB.

2.0 TSI and 2.0 TFSI – EA888 Gen.3B

EA888 Gen.3B engines are found in models including the Audi A4, A5, A6, A7 and Q5, as well as selected Volkswagen, Škoda and SEAT vehicles.

Example engine codes include:

• CVKB,
• DBPA,
• DKZA,
• DKTB,
• DPLA,
• DPLB.

2.0 TSI and 2.0 TFSI – EA888 Gen.4 / Evo4

EA888 Gen.4 engines are used in newer and performance-oriented VAG models, including the Audi A3 and S3, Volkswagen Golf GTI and Golf R, Cupra Leon and Formentor, and Škoda Octavia RS.

Example engine codes include:

• DNNA,
• DNFB,
• DNFC,
• DNFD,
• DNFG.

The codes listed above are examples only. An engine code alone is not enough to qualify a vehicle for the service. Before carrying out the modification, we verify the ECU, software number and actual oil-pump operating strategy.

Audi A6 C8, Audi A7 C8 and Vehicles from Other Markets

The modification may also apply to selected Audi A6 C8 and Audi A7 C8 versions equipped with four-cylinder 2.0 TFSI engines, including variants offered outside Europe.

Vehicles imported from the USA, Canada and other markets may differ in terms of:

• engine code,
• emissions standard,
• ECU version,
• thermal-management and lubrication strategy,
• transmission software,
• component configuration.

For this reason, we do not qualify a vehicle based only on the commercial designation 1.5 TSI or 2.0 TFSI.

Before carrying out the modification, we verify:

• the VIN,
• the engine code,
• the ECU part number,
• the hardware and software version,
• the vehicle’s intended market,
• the type of lubrication system installed.

Can the N428 Valve Simply Be Disconnected?

In some designs, disconnecting the control valve may cause the pump to enter a fail-safe mode and maintain the higher-pressure range.

This is not a professional modification.

Disconnecting the valve may cause:

• a permanent fault code to be stored in the ECU,
• the Check Engine warning to illuminate,
• loss of proper system monitoring,
• more difficult future diagnosis,
• masking of other lubrication-system problems.

A correct modification should be performed in the software after the ECU has been identified and the vehicle’s technical condition has been assessed.

Will Fuel Consumption Increase After the Modification?

Operating the pump in the higher-pressure range creates slightly greater mechanical resistance. In theory, it may therefore have a minor effect on fuel consumption.

In everyday use, the difference is usually not noticeable. The purpose of the modification is not to improve fuel economy, but to increase the safety margin of the lubrication system.

Software Will Not Repair a Damaged Engine

Software modification is not a substitute for mechanical repair. If actual oil pressure is too low because of wear or a mechanical fault, changing the calibration will not eliminate the cause.

Incorrect oil pressure may be caused by:

• a worn oil pump,
• a damaged pressure-control valve,
• a contaminated or restricted oil pickup,
• excessively worn bearings,
• an insufficient oil level,
• incorrectly selected engine oil,
• fuel dilution of the oil,
• internal leakage within the lubrication system,
• incorrectly performed previous repairs.

When an engine shows symptoms of lubrication problems, we first establish the actual cause. Only after mechanical condition has been confirmed can a change to the factory strategy be considered.

How Is a Vehicle Qualified for the Modification?

At Szulc Motorsport, we do not perform this service blindly and we do not upload the same ready-made file to every vehicle.

The diagnostic scope is selected according to the specific vehicle, symptoms, ECU and service history. Depending on the case, we verify:

• the VIN and engine code,
• the type of engine control unit,
• the current software version,
• faults stored in the control units,
• engine-oil and coolant temperature,
• actual engine operating parameters,
• system behaviour at different engine speeds and loads,
• transmission operation and shift points,
• service history and the oil previously used.

When incorrect pressure is suspected, we also carry out a mechanical pressure measurement using a pressure gauge. This allows us to assess the actual condition of the system rather than relying only on values requested or interpreted by the ECU.

Engine Oil and Service Intervals Still Matter

Changing the oil-pump strategy does not remove the need for proper maintenance. Even the best software cannot protect an engine filled with worn, fuel-diluted or incorrectly selected oil.

In modern TSI and TFSI engines, we do not consider maximum LongLife intervals beneficial for long-term ownership.

For most vehicles, a sensible reference point is an oil change every approximately 10,000 kilometres or once a year. Frequent city driving, repeated cold starts, increased engine output or intensive use may require an even shorter interval.

Engine oil is selected according to:

• the engine design and engine code,
• the manufacturer’s required approval,
• the vehicle’s operating conditions,
• working temperatures,
• the extent of engine modification,
• the actual mechanical condition of the engine.

The oil brand alone does not solve the problem. The correct approval, viscosity, product quality, engine condition and suitably short replacement interval all matter.

When Is the Modification Worth Considering?

Changing the oil-pump strategy may be technically justified particularly in vehicles:

• after a Stage 1 or Stage 2 modification,
• producing high torque from low RPM,
• with an automatic transmission that holds excessively low engine speeds,
• driven dynamically or under high load,
• intended for long-term ownership,
• whose owner wants to improve the operating conditions of the entire powertrain.

This does not mean that every engine requires the modification. The first step is to identify the system installed in the specific vehicle and determine how its factory strategy actually operates.

How Do We Work at Szulc Motorsport?

We are not a workshop that uploads ready-made files without analysis. Every vehicle is identified and evaluated individually.

Our procedure may include:

• vehicle, engine and ECU identification,
• electronic and mechanical diagnosis,
• analysis of the oil-pump operating strategy,
• verification of actual engine parameters,
• assessment of transmission operation,
• individual preparation of the software modification,
• verification of operating parameters after the change.

Depending on the vehicle’s requirements, we can combine:

• oil-pressure strategy modification,
• DSG or other automatic-transmission Shift Points calibration,
• engine-software optimisation,
• engine-oil servicing,
• mechanical and electronic diagnosis.

Our objective is not merely to perform a software modification. The purpose is to improve the operating conditions of the entire powertrain and reduce the causes of accelerated mechanical wear.

Frequently Asked Questions

Does the oil-pressure modification increase engine power?

No. The modification does not increase power or torque. It changes the control strategy of the lubrication system.

Can every 1.5 TSI and 2.0 TSI engine be modified?

No. The possibility of carrying out the service depends on the engine code, oil-pump design, ECU and software version.

Is the modification safe?

A correctly performed modification in a mechanically sound engine increases the lubrication-system safety margin. It should not, however, be carried out without identifying and diagnosing the vehicle first.

Is it worth carrying out after Stage 1?

In a vehicle with increased torque, changing the oil-pump strategy can be a sensible addition to the performance modification, particularly when the engine is heavily loaded at low RPM.

Will fuel consumption increase?

In theory, operating the pump in the higher-pressure range may slightly increase mechanical resistance. In normal driving, the difference is usually not noticeable.

Can the service be carried out on a vehicle imported from the USA or Canada?

Yes, but such a vehicle requires individual identification. Non-European versions may use different engines, ECUs, software and lubrication strategies.

Can the oil-pump valve simply be disconnected?

We do not recommend this solution. It may cause fault codes, illuminate the Check Engine warning, prevent proper system monitoring and complicate future diagnosis.

Will the software repair low oil pressure?

Not when the cause is mechanical wear or failure. A damaged pump, worn bearings, faulty valve or restricted oil pickup requires repair rather than software modification.

Does the DSG transmission also need to be modified?

Not always. In many vehicles, however, Shift Points calibration provides a better overall result because it limits high-load engine operation at extremely low RPM.

Summary

Software-based oil-pressure strategy modification in selected 1.5 TSI EA211 EVO and 2.0 TSI or 2.0 TFSI EA888 engines allows the higher oil-pump operating range to be activated earlier and increases the safety margin of the lubrication system.

It is not a universal solution for every vehicle and it is not a method of repairing a worn engine. Safe implementation requires ECU identification, assessment of mechanical condition, analysis of the factory operating strategy and verification of the entire powertrain.

The best results are achieved when the engine, lubrication system and transmission are treated as one cooperating system. Depending on the individual case, oil-pressure modification can be combined with Shift Points calibration, proper engine-oil servicing and comprehensive diagnosis.

Szulc Motorsport – Diagnosis Instead of Guesswork.
Every vehicle is individually assessed before the modification is carried out.

Tel. +48 602 808 979