Nozzle calculator – This is where you calculate the optimum flow rate for the injection nozzle

Very important: let us test your nozzles in good time!

In addition to the nozzle calculator, we recommend our Injector nozzle service - Whether new or used nozzles. It is always very important to know if the nozzles are working properly and if they are all injecting exactly the same amount. You can only see that in our nozzle tester. Unfortunately, it cannot be seen when installed in the engine!

Caution: The nozzle calculator calculates on a turbo basis

The nozzle calculator calculates on a turbo basis. We are therefore assuming that your project is a turbocharged engine with intake manifold injection and that the fuel used is "normal fuel from the tank". The calculation would be different for naturally aspirated engines. In addition to the right nozzles, the entire fuel supply is also important, i.e. pumps, filters, fuel regulators, etc. If you are not quite sure, simply contact us by E-Mail or call us.

We do not assume any liability for the correct result of the calculator. If in doubt, please ask your voter or us, we will be happy to help you with your project.

How to use our injector calculator

You can use our nozzle calculator to work out which injection nozzles are best suited to your project. To do this, proceed as follows:

Aimed performance: Simply enter your desired engine performance here. The higher the performance, the more fuel has to be injected.
Number of cylinders: Our nozzle calculator also needs this value. We entered 4 cylinders as the base value here because most of the VW Group engines have 4 cylinders.
Duty Cycle (pulse in %): This value describes how long the injection nozzle is opened. 90% should not be exceeded because each nozzle has to close again briefly after opening. A nozzle is nothing more than a magnetic coil that heats up during operation. The constant opening and closing stresses the spool through friction. So give the coil at least 10% "rest". If you want to be on the safe side, it is better to choose a value between 60 and 70% in our calculator. This gives you more reserves for a later increase in engine performance.
Flow rate: This is the result of the nozzle calculator and thus your required injection nozzle. If here e.g. For example, if a value of 590 ccm comes out, we recommend 660 ccm injection nozzles, then you still have some "air" up and your tuner can start the activation (duty cycle) a little lower. This way you protect your nozzles and you can enjoy your engine for a long time. Here you can go directly to our selection of Injectors in the shop.

Aimed performance:

PS

Number of cylinders:

Dutycycle

%

Flow rate:

cc/min

How fuel injection works

Unlike older engines with carburetors, today's engines are fueled by fuel injection. The control is done electronically. In this case, a defined quantity of fuel is injected at a certain position of the pistons (flow rate).

Advantages of gasoline injection compared to a carburettor

Reduction of fuel consumption (due to better metering and supply of petrol).
Higher power density (thanks to optimal cylinder filling).
Less harmful exhaust gases.
Engine conditions are better taken into account (warm-up, overrun).

Why is the injection quantity calculated?

When designing a car, the injection quantity is calculated in order to be able to design the injection pump and its control parameters. The injection is controlled via the engine control unit in order to be able to optimally supply your engine with fuel at all times. The software of the ECU (engine control) can even take into account the properties of different fuels. So you almost always get the same performance - regardless of the fuel.

What does the injection quantity mean for supercharged engines?

Charged engines with turbochargers or superchargers require more fuel than naturally aspirated engines. This is due to the fact that there is a higher internal pressure (boost pressure) and also higher temperatures. The high oxygen content in the combustion chamber can also be used to burn more fuel. Naturally aspirated engines can therefore also run lean mixtures, while turbocharged and supercharged engines require richer mixtures. With the right injection quantity, the efficiency of the engine increases and you achieve more performance. And that's exactly what we want to achieve with tuning.

What is the duty cycle?

The duty cycle (duty cycle) indicates the working cycle of an injector: The relative time that an injector is on and fueling during an engine cycle (intake, compression, combustion and exhaust). For example, a duty cycle of 80% indicates that the injector is held open 80% of the time and closed 20% of the time. If the engine requires more fuel, the duty cycle increases so that more fuel gets into the engine. A duty cycle of 100% is referred to as a static duty cycle. The injection valve can no longer control the fuel supply, which can indicate that the valve is too small.