The same has been found for the “RS” or internationally tuned Sea-Doo’s, peaking at above 74mph (in some instances) and backing down to 72mph within a few seconds. While the American-tuned Sea-Doo’s can temporarily reach a peak speed of 72+ mph, the GPS-monitored-speedometer will alert the ECU, and the engine will immediately begin backing down to around 68 mph. Unfortunately, contrary to popular belief, both the USA-tuned and the International- tuned ECU for the new 2016 Sea-Doo 300-series watercraft (RXP-X 300, RXT-X 300 and GTX Limited 300) all have a speed limiter.
While the peak top speed reached is impressive, it is temporary as the factory ECU immediately scrubs ignition timing and cuts fuel to the engine, bringing the PWC back to a “factory limited” speed.įor 2016, the new 300-horsepower Sea-Doo RXP-X, RXT-X and GTX Limited can all reach impressive peak top speeds, with several reports coming in of 72-plus-mph on the USA ECU tune alone.
Holding that top speed is what is called “sustained top speed” and that split second where the watercraft reached a top speed, is its “peak top speed.” And while a standard off -the-shelf GPS will successfully record a true peak top speed, that number is not telling you how long the watercraft maintained that speed. It’s time to learn the difference between “peak top speed” and “sustained speed.” The Internet forums and social media feeds are buzzing with cell phone pictures of hand-held GPS’ showing amazing speeds from the latest batch of supercharged runabouts from Sea-Doo and Yamaha.
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