0-Ohm vs. Conventional Spark Plug Wires: What Does Resistance Really Change?

Every spark produced by a remote ignition coil has to travel through a conductor before it reaches the spark plug. The resistance of that path affects how much of the coil's available energy is lost as heat.

Granatelli's 0-Ohm wire technology was developed to minimize resistance while maintaining the noise suppression modern engine-management systems require.

Why Conventional Wires Use Resistance

Many traditional ignition wires intentionally include resistance to reduce radio-frequency and electromagnetic interference. The downside is that resistance also consumes some of the electrical energy moving toward the spark plug.

The Granatelli Approach

Granatelli's patented technology uses extremely low resistance along with protector-ring and conductor designs intended to control RFI/EMI. The goal is to deliver more of the coil's available energy to the plug without creating interference problems for the ECU and electronics.

What the Dyno Claims Mean

Granatelli has reported rear-wheel horsepower and torque gains in testing across a variety of vehicles. Results vary based on the wire set being replaced, engine condition and whether the existing ignition system is already a restriction.

A wire does not create airflow; any gain comes from reducing ignition loss and improving combustion consistency where the previous system was limiting performance.

Where Low-Resistance Wires Matter Most

• High-output coils
• Boosted LS and LT engines
• Nitrous applications
• High-compression engines
• Long wire routes
• Performance engines with headers and high under-hood heat

Noise Suppression Still Matters

Modern ECUs, sensors, data systems and radios can react badly to electrical noise. That is why a low-resistance wire must be designed as a complete ignition component rather than simply using an unsuppressed solid conductor.

Verify Fitment and Length

Granatelli offers multiple wire lengths, terminal styles and heat-protection options. Choose the set by vehicle/engine fitment and actual routing, not only by color.

The Bottom Line

Lower resistance can reduce energy loss between the coil and spark plug, but the wire still has to control electrical noise and survive heat.

Granatelli 0-Ohm wires are designed to combine those goals for street and race applications using modern electronic engine management.

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Related reading: Read our previous Granatelli tech article.