What octane fuel is required for the Kenne Bell supercharger on a 4.6L 2V Mustang GT?

Premium unleaded fuel with a minimum octane rating of 91. The document says never to use octane lower than 91 and to buy from reputable stations such as Mobile, Chevron, Texaco or Unocal 76.

Why shouldn't you drive in boost with less than a quarter tank of fuel?

Low fuel level can cause the fuel pump to cavitate, resulting in low fuel pressure. This can cause detonation that may result in severe engine damage. The sheet advises treating a quarter tank as if it were empty.

Why is traction control a concern with this supercharger kit?

When activated, the factory traction control leans the engine considerably and removes ignition advance to reduce horsepower, and also activates the rear brakes. The lean fuel condition may cause detonation resulting in engine damage, so traction control should be used at the driver's discretion.

Does the engine have knock protection with this kit?

No. The document states these engines have no form of knock protection or prevention equipment, and the pistons are susceptible to failure under a detonation condition. Never let the engine ping or detonate.

What modifications void Kenne Bell's liability?

Kenne Bell assumes no liability for misuse, including changing supercharger pulleys (boost), injectors, chip, mass air flow meter, fuel pump equipment, and/or incorrectly installed supercharger components — these changes are at the end user's discretion.

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Kenne Bell Supercharger Warning Sheet KB-006 - 4.6L 2V SOHC Mustang GT

Orange Kenne Bell warning and instruction sheet for a 4.6L Mustang supercharger covering octane, fuel and detonation

Kenne Bell supercharger warning sheet with octane, fuel-level and detonation instructions and cautions.

AI caption May 2014 · Photo 0 of 5000

This document is a Kenne Bell supercharger warning sheet (marked KB-006, titled "WARNING – READ THIS FIRST!") for the 4.6 liter 2-valve SOHC Ford Mustang GT. It outlines three major operational concerns for a supercharged engine: (1) Octane – always run premium unleaded fuel with a minimum of 91 octane, preferably from reputable stations such as Mobile, Chevron, Texaco or Unocal 76; (2) Fuel Level – never operate in boost with less than a quarter tank of fuel, since low fuel can cause pump cavitation, low fuel pressure, detonation, and severe engine damage; (3) Traction Control – the factory system leans the engine and removes ignition advance, which can cause detonation on a supercharged engine, so it should be used at the driver's discretion. A section on detonation warnings states Kenne Bell assumes no liability for misuse, including changing pulleys (boost), injectors, chips, mass air meters, or fuel pump equipment, and stresses that these engines have no knock protection and the pistons are susceptible to failure under detonation. A separate white warning sticker repeats the octane/fuel-level warnings. The lower portion of the page is partially obscured by the sticker and packaging glare.

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Frequently asked questions

What octane fuel is required for the Kenne Bell supercharger on a 4.6L 2V Mustang GT?: Premium unleaded fuel with a minimum octane rating of 91. The document says never to use octane lower than 91 and to buy from reputable stations such as Mobile, Chevron, Texaco or Unocal 76.
Why shouldn't you drive in boost with less than a quarter tank of fuel?: Low fuel level can cause the fuel pump to cavitate, resulting in low fuel pressure. This can cause detonation that may result in severe engine damage. The sheet advises treating a quarter tank as if it were empty.
Why is traction control a concern with this supercharger kit?: When activated, the factory traction control leans the engine considerably and removes ignition advance to reduce horsepower, and also activates the rear brakes. The lean fuel condition may cause detonation resulting in engine damage, so traction control should be used at the driver's discretion.
Does the engine have knock protection with this kit?: No. The document states these engines have no form of knock protection or prevention equipment, and the pistons are susceptible to failure under a detonation condition. Never let the engine ping or detonate.
What modifications void Kenne Bell's liability?: Kenne Bell assumes no liability for misuse, including changing supercharger pulleys (boost), injectors, chip, mass air flow meter, fuel pump equipment, and/or incorrectly installed supercharger components — these changes are at the end user's discretion.