# How do I know what size fuel injectors I need?

## How do I know what size fuel injectors I need?

Injector Math: How to Calculate Optimum Fuel Injector Size

1. Step 1: Determine Horsepower.
2. Step 2: Determine Approximate BSFC (Brake-Specific Fuel Consumption)
3. Engine Type BSFC Using Gasoline.
4. Step 3: Determine Your Safe Duty Cycle.
5. Step 4: Calculate Your Optimum Injector Size.
6. Step 5: Fine-Tune the Flow.

### What will bigger fuel injectors do?

The larger the diameter, the more fuel an injector can deliver. As fuel injector size increases, there are some unwanted side effects. As an injector’s hole gets bigger, the minimum amount of fuel it can flow also gets larger.

Can you run bigger fuel injectors on a stock car?

You can;t do a stock tune unless you can fool the ecu into thinking it is getting more or less air. If you throw in bigger injectors it will hold that injector open for the same amount of time as the smaller injectors and it will dump TONS of fuel in.

Will bigger injectors hurt mpg?

In the end, do not upgrade to larger injectors in an attempt to get better fuel mileage, as new stock sized injectors will do the job if your current injectors are worn out. But at the same time, if you are looking for more power, do not be afraid to go to a larger injector because of losing fuel economy.

## Do I need a tune if I get bigger injectors?

In general, injectors need a tune. Otherwise, your ECU is trying to drive the new, bigger injectors using the duty cycle and dead times for the old, smaller injectors, which means too much gas potentially at the wrong time (i.e. – running rich and potentially missing).

### Do bigger injectors increase HP?

Larger throttle body and injectors A larger high-performance throttle body will deliver more horsepower. Depending on what type of engine you have, you can gain as much as 10-20 more horsepower and comparable torque.

How are fuel injectors measured?

Manufacturers rate fuel injectors by the maximum amount of fuel that they can flow in a given amount of time. This measurement is taken with the injector on 100% of the time (100% duty cycle, or wide open) and with the fuel at a given pressure (usually 43.5 psi). For example, a 19 pound per hour (Lb/Hr.)

What are the two types of fuel injectors?

Port or multipoint fuel injection. Sequential fuel injection. Direct injection.

## What brand of fuel injectors are best?

The Top 9 Fuel Injector in the Global Market:

• Bosch Fuel Injector.
• Denso Fuel Injector.
• Delphi Fuel Injector.
• Magneti Marelli Fuel Injector.
• Edelbrock Fuel Injector.
• Keihin Fuel Injector.
• Woodward Fuel Injector.
• Continental Fuel Injector.

### Do bigger injectors use more fuel?

There can be a larger injector, running less pulse width, that is actually spraying the same amount or even less overall fuel than a stock injector in certain scenarios, such as cruising down the highway.