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. 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. 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.”

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.

For 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. 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 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. 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.

Thankfully, RIVA Racing has found a workaround for the factory speed control with their RIVA Sea-Doo 2016+ Speed Control Override Module (SCOM). By removing the restrictive GPS speed control function on Sea-Doo iControl models, all 300-model units equipped with the RIVA Racing SCOM will experience significant increases in top speed – all with retaining the stock ECU tune. This easy-to-install module also allows the unit to start in “Sport Mode” for maximum performance, with “Touring Mode” being manually selected after start up.

  • Removes GPS controlled speed limiter
  • Increases top speed utilizing stock ECU
  • Works on all 2016 300hp & 260hp models
  • Delivers 75mph top speed on 2016 RXP-X 300
  • Allows further top speed gains through aftermarket modifications
  • Allows system to start in “Sport Mode”
  • All original dash functions are retained
  • Easy plug-in installation

It is important to note that the stock ECU limits peak RPM for first 5 hours of operation for break-in purposes. Top speed increases should be measured after the 5 hour break in period.

By : KEVIN SHAW | 2016

All RIVA Racing Sea-Doo 2016+ Speed Control Override Modules are available for $199.95 and can be purchased at today.