How much fuel flow for 600hp?

If you’re building a performance engine and targeting 600 horsepower, one of the most important questions you need to answer is: how much fuel flow does my setup actually need? Getting this wrong can cost you power, reliability, or even an engine.

Fuel flow isn’t about guessing or “going big just in case.” It’s about matching injector size, fuel type, and system capacity to your horsepower goal. Let’s break it down clearly.

Why Fuel Flow Matters at 600 HP

At 600 horsepower, your engine is no longer operating anywhere near stock parameters. Airflow increases dramatically, and fuel delivery must keep up perfectly to maintain a safe air-fuel ratio.

If fuel flow is insufficient, you risk:

• Lean conditions

• Detonation

• Loss of power

• Engine damage

Proper fuel flow ensures consistent power, safe combustion, and stable tuning under load.

The Formula for Fuel Flow

Fuel flow requirements are typically calculated using Brake Specific Fuel Consumption (BSFC).

A common performance estimate:

• Gasoline engines: 0.50–0.60 BSFC

• E85 engines: 0.70–0.85 BSFC

Gasoline Example (600 HP)

600 × 0.55 = 330 lbs/hr total fuel flow

Divide by number of injectors (8-cylinder engine):
330 ÷ 8 = 41.25 lbs/hr per injector

Now add a safety margin and duty cycle limit (80–85%):
You realistically need 60 lb/hr injectors minimum on gasoline.

E85 Example (600 HP)

600 × 0.75 = 450 lbs/hr total fuel flow

450 ÷ 8 = 56.25 lbs/hr per injector

With duty cycle headroom:
You’ll want 80 lb/hr injectors or larger for E85 at 600 HP.

Recommended Injector Sizes for 600 HP

On Gasoline

• Minimum: 60 lb/hr injectors

• Ideal: 65–80 lb/hr injectors (room to grow, safer tuning)

On E85

• Minimum: 80 lb/hr injectors

• Ideal: 95–105 lb/hr injectors

Going slightly larger than minimum improves injector longevity, keeps duty cycles low, and gives tuners more control.

Injector Size vs Fuel Pump Capacity

Injectors are only half the equation. Your fuel pump and lines must also support the required flow.

At 600 HP, you should also have:

• High-flow in-tank or external fuel pump

• Upgraded fuel lines (AN recommended)

• Quality fuel pressure regulator

• Clean fuel filter

A restrictive pump will limit injector performance no matter how large they are.

Why Bigger Isn’t Always Better

Oversized injectors used to cause poor idle and drivability. Modern high-performance injectors solve this with:

• Improved atomization

• Faster response times

• Better low-pulse control

That’s why many builders choose 80 lb/hr injectors even on gasoline for a 600 HP goal—it’s safer and more future-proof.

Common 600 HP Fueling Mistakes

• Running injectors at 95–100% duty cycle

• Ignoring fuel type differences

• Using mismatched or untested injectors

• Skipping fuel pump upgrades

• Guessing instead of calculating

Proper fueling is about balance, not extremes.

Final Answer: How Much Fuel Flow for 600 HP?

Short answer:

• Gasoline: 60–80 lb/hr injectors

• E85: 80–105 lb/hr injectors

Combined with the right fuel pump, lines, and tuning, this setup will safely support 600 horsepower with room to grow.

Build It Right the First Time

At High Performance Injectors, all injectors are:

• Flow-matched

• E85 compatible

• Tested for accuracy and consistency

• Built for street and race reliability

Fuel delivery is the foundation of power. Size it right, and your engine will reward you every time you hit the throttle.