Fuel Injector Flow Rate Calculator

Calculating Injector Flow Rate at Increased Pressure

You do not need to trawl through manufacturer specification brochures to find out what engine power your fuel injectors can support. All calculations can be performed using the empirical formulae found in our "Injector Flow Rate" article. However, you can carry out these calculations quickly, without delving into the maths, by using this specialised calculator.

How to Use the Calculator

Simply enter the desired engine power and the number of active injectors. You also need to determine the BSFC (Brake Specific Fuel Consumption) coefficient (which depends on your engine type) and input the fuel pressure adjustment if required, bearing in mind that the standard fuel rail pressure is **3 bar**. It is not recommended to **alter the injector duty cycle percentage**, as the default value is optimal; changing it may compromise performance. Once all data is entered, our calculator will quickly determine the static fuel injector flow rate required for your vehicle's engine in a single click.

The calculator is useful when replacing stock injectors with aftermarket alternatives, during engine tuning, or simply when checking fuel injectors on a professional flow bench.

You can also perform an online calculation for **increased pressure**. Please note that pressure can be raised **up to 4.5 bar** (common for turbocharged tuned engines). To calculate the required static flow rate, simply enter the old flow capacity and the new operating pressure of the fuel system. The tool will then display the new maximum flow rate of the injector in the **open state**, defined by the amount of petrol delivered per unit of time (cc/min or cm³/min).

Frequently Asked Questions

• What is cc/min?

  Breaking down "cc/min": "cc" stands for cubic centimetres (volume), and "min" represents the time interval. Together, they express the static flow rate, which determines the amount of fluid (in this case, fuel) flowing through the injector nozzle per unit of time (1 minute). Manufacturers often refer to this flow rate as injector size and indicate the value in cm³/min (using the abbreviation cc/min).

• How can I find out the injector flow rate?

  Manufacturers encode fuel injector flow rates differently—some by colour, others by part numbers. Since there is no universal method to determine how much fuel they flow per minute just by looking, the best option is to **flow test them on a test bench**.

  
  The injector is connected to a fuel rail at 3 bar pressure, placed in a measuring flask, powered up, and timed. The flow rate is judged by the volume of fuel dispensed in cubic centimetres. This method is also used when cleaning injectors to check for carbon deposits, as contamination reduces flow capacity. If a measuring flask is unavailable, you can simply weigh the fuel sprayed through the injector over one minute. To convert the weight to volume in cubic centimetres, divide the weight by the fuel density (which varies by petrol grade, but averages 0.76 g/cm³).

• Lada 110 (VAZ 2110) Injector Flow Rate

  The injector flow rate on the Lada 110 (VAZ 2110) remains consistent regardless of the engine installed. The VAZ 110–112 family cars were equipped with Bosch and Siemens injectors. Stock factory injectors for 8-valve and 16-valve 1.5L engines are predominantly Bosch 0 280 158 996 (superseded by 0 280 158 110), with Siemens DEKA VAZ 6238 as a substitute. The 1.6L engines (8V and 16V) use BOSCH 0 280 158 502, 0280158022, and 0280158017 (used with Yanvar 7.2 / M 7.9.7 ECUs). Both types have a flow rate of **132 cc/min**. Siemens DEKA analogues have a slightly lower flow rate of 110–120 cc/min.

• Flow Rate of Injector 6354

  The Siemens Deka ZMZ 6354 injectors (purple), typically found on GAZelle vehicles and often used for Lada engine tuning, feature 2 spray holes and a flow rate of 155.4 cc/min. The yellow Deka 1D ZMZ 6354 injectors have a flow rate of **194 cc/min**.

• Bosch 0280158107 Flow Rate

  The Bosch 0280158107 injector (fitted to ZMZ-405, 406, 409 engines) has a resistance of 12 Ohms and 4 spray holes. The standard flow rate for the Bosch 0 280 158 107 is 192 cc/min at a fuel pressure of 3 bar. The static flow rate is 2.4256 mg/ms.