How do I know what size my fuel injectors are?

Fuel Injectors are sized by their flow rate. Flow rate is a measurement of how much fuel can be delivered over time. It is listed in pounds per hour (lbs./hr.) or cubic centimeters per minute (cc/min.). The right size injector can supply enough fuel under full load conditions at an 80% duty cycle.

What size injectors do 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.

Can you run too big of an injector?

There really shouldn’t be a downside to running larger injectors if they are tuned properly and your AFRs are in check. If you are staying out of boost or around stock boost levels, your car shouldn’t be anymore thirsty than it was from the factory. …if anything it should be a little MORE efficient.

Are all injectors the same size?

Typically injectors come in three sizes; 34, 48 and 60mm. These measurements are taken from the top of the lower O-ring to the bottom of the upper O-ring. Pictured below are three common injector types/sizes; (L to R) ID850/1300/2000 (34mm), ID725/1000 (48mm), EV1 Bosch 1680 (60mm).

Are bigger injectors better?

Bigger is not always better It’s easy to fall into the trap of thinking that bigger fuel injectors equal more power, but unless your engine is set up to deal with the extra fuel, you’ll be on a fast track to trouble. The excess fuel will flood the engine and it either won’t run at all, or will be running too rich.

How much HP can 1000cc injectors handle?

The 1000cc Injectors can support 650+whp.

What is 1000cc injectors?

1000cc/min injectors would equate to 95.2 lb/hr. Your 60lb injectors are 630cc/min. Only the ricers are usually concerned about injector size bragging rights. If your friend’s engine truly requires those injectors to keep the injector duty cycle in the 80% ballpark, look out.

When should you get bigger injectors?

Running too lean At the other end of the scale is where you’ve modified the engine but the injectors aren’t delivering enough fuel to keep up. If you’ve added a turbo, a higher flowing fuel pump, a bigger exhaust and remapped your computer, you’re going to need bigger fuel injectors.

What happens when you put bigger injectors?

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.

Can you run bigger injectors without a tune?

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).

How big is the LS fuel injector in a truck?

ENGINE PART # INJECTOR SIZE LH9 12613411 36 lb/hr @ 58 psi LS2 Truck 12569113 89017586 34 lb/hr @ 58 psi L76 Truck 12580681 30 lb/hr @ 58 psi LFA 12580681 30 lb/hr @ 58 psi

How big is the Isuzu 4HF1 direct injection engine?

The 4HF1 is an OHC direct injection engine of 4.33L capacity. Applications include the 1998 Isuzu NPR200 Applications include the 1998 Isuzu NPR200 112 mm (4.4 in)

What kind of injector does a Gen 3 truck have?

The early Gen III truck engines such as the 4.8L, 5.3L, and 6.0L LS engines spec’d a much shorter injector body that retains the upper and lower O-ring dimensions of the LS1/EV1 but is substantially shorter than the LS1 injector. Making this early truck injector unique is its Multec 2 connector.

How does fueltech calculate horsepower for fuel injectors?

FuelTech also offers the option to determine the maximum horsepower rating of fuel injectors by working backwards, using fuel injector sizing and other parameters.