REV LIMITER / RPM LIMIT ADJUSTMENT

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Higher Top Speed

Unlock more MPH by allowing the engine to spin slightly faster with the right prop.

Perfect Propping

Gives you the headroom needed to dial in the perfect propeller pitch.

Safe Adjustments

We only raise limiters to proven, mechanically safe RPM levels.

Expert Advice

Receive tailored advice on target RPM and prop selection.

Consultation

Tell us your current WOT RPM and prop details.

Mail-In

Send your ECU to our tuning facility.

Limiter Adjustment

We safely adjust the RPM limits in the ECU software.

Return & Test

Reinstall the ECU, test your WOT RPM, and adjust propping if necessary.

Every outboard engine leaves the factory with a hard RPM limiter programmed into the ECU. If the engine reaches this RPM, the ECU will cut fuel or ignition to prevent the engine from spinning any faster. Manufacturers set these limiters very conservatively. They must account for the worst-case scenario: an owner running a tiny propeller that allows the engine to free-rev instantly with no load. To protect against this abuse, the factory redline is often set hundreds of RPM lower than what the engine's internal components (valvetrain, rods, and bearings) can safely handle.

When you upgrade your outboard with our ECU remapping service, you are significantly increasing the horsepower and torque. To harness this new power, you often need to change your propeller. A larger pitch propeller will increase your top speed, but it will also lower your Wide Open Throttle (WOT) RPM. Conversely, if you keep your current prop, the extra power will cause the engine to spin faster, immediately slamming into the factory rev limiter and cutting your speed short.

Propping a boat is a delicate balancing act. You want a prop that allows the engine to reach its peak horsepower RPM when the boat is fully loaded, without over-revving when the boat is light. By safely raising the rev limiter via our mail-in ECU tuning, we give you a broader window to work with. For example, if your factory limiter is 6000 RPM, and your engine makes peak power at 5800 RPM, you have a very narrow margin for error. If we raise the limiter to 6400 RPM, you have the headroom to run a slightly smaller pitch prop for a blistering holeshot, while still having the RPM range to achieve a high top speed without the ECU shutting the party down.

This adjustment is particularly crucial for performance hulls, bass boats, and racing applications where every single MPH counts. We don't just raise the limiter blindly; we analyze the specific engine architecture. We know exactly what RPM the valve springs can handle before valve float occurs, and we set our new limiters safely below that mechanical threshold.

A tune is only as good as the propeller attached to the engine. That is why our rev limiter adjustment service includes expert propping advice. When we provide a tune, we specify a target WOT RPM. Once you receive your tuned ECU back in the mail and hit the water, you test your WOT RPM. If you are hitting the new limiter too easily, we will advise you on exactly how many inches of pitch to add to your propeller to bring the RPM down into the meat of the new powerband, maximizing your top speed.

This holistic approach to boat performance tuning in Australia ensures you aren't just buying a software file, but a complete performance solution. Adjusting the rev limiter is the final key that unlocks the true potential of your hull and engine combination.

Is it safe to raise the rev limiter?

Should I re-prop after tuning?

Will this void my warranty?

What is my target WOT RPM?