We're proud to announce our RPM Kit for the new Yamaha FX-SHO.

The FX-SHO has a completely new engine and engine management system; which has many safeguards built into it. Our RPM Kit optimizes the SHO's performance within the limits of the stock engine management system providing improved acceleration and top speed as well as enhanced handling.


We are working on our Stage I Kit and anticipate a mid summer release date. The parts in our RPM Kit will carry over to Stage I with the addition of other RIVA Performance Modification parts.

Riva will the rpm kit require modifying the prop/pump in any way?thanks

No. If you do modify the prop or pump to increase rpm you will only hurt performance because the engine management system will kick in.

How come the speed numbers changed on the SHO RPM kit??

Our r&d department reported to us today that after breaking in their test unit the actual speeds were higher both stock and modified. Initial numbers were obtained with little time on the craft. After having it on the water for more than a week they decided to double check the numbers as this has happened in the past.

How many hours are on the crafts if I may inquire?

I don't know exactly.

Not a big deal.

It seems with all of the stock boats topping out at 65mph that acceleration numbers are more important. Does Riva have any acceleration numbers on stock and modified PWCs?

Actually, top speed is everyone's main concern. When it comes to acceleration numbers we let the mags publish that info when they test our craft. Which, by the way, you can expect to read about soon as we have lots of tests scheduled soon!

quote:

Originally posted by RIVA CREW:
Actually, top speed is everyone's main concern. When it comes to acceleration numbers we let the mags publish that info when they test our craft. Which, by the way, you can expect to read about soon as we have lots of tests scheduled soon!

Gonna be testing the good stuff?????????????

I have been riding for 4 years now and while I like a fast boat the places that you can run flatout for any length of time are limited on Lake Erie.

Riva
Can you tell me the details of how top speed and acceleration data is collected? Radar gun? GPS? Timed distance? And what sampling frequency do testers typically use. I am trying to understand the margin of error in these measurements particularly acceleration numbers.

We use a Stalker Pro radar gun that we hook up to our lap top to graph the speed run. We back up the top speed with a GPS the rider wears on his vest.

quote:

Originally posted by RIVA CREW:
We use a Stalker Pro radar gun that we hook up to our lap top to graph the speed run. We back up the top speed with a GPS the rider wears on his vest.

How much louder did the ski get with the free-flow installed?? Did you guys test for actual boost numbers at all?? Ive heard so much different info on boost im not sure whats going on. Seen from 2-6psi listed across the net.
-JT

It's a little louder. I don't mind it.

Not sure what the boost is yet, but it doesn't really matter because anything you do to raise boost sets off the stock engine governors.

quote:

Originally posted by RIVA CREW:
It's a little louder. I don't mind it.

Not sure what the boost is yet, but it doesn't really matter because anything you do to raise boost sets off the stock engine governors.

I got ya. Was just curious what stock wheel pushes.

What will the stage 1 kit consist of on top of the RPM kit?

There will be additional parts, but we aren't ready to disclose exactly what they will be at this time. Sorry..