Below is a scan of the documentation printed directly from the DEPAC software for our Huff Dyno. I am in the process of entering the data into a spread sheet so it is more legible. I will post a PDF file soon.

The data is displayed as follows:

• Column 1: Stock engine; baseline run.
  
• Column 2: RIVA Power Filter Kit installed.
  
• Column 3: RIVA Power Filter Kit and RIVA / Vortech Supercharger Impeller installed.
  
• Column 4: RIVA Power Filter Kit, RIVA / Vortech Supercharger Impeller and RIVA Power Cooler Kit (w/incorporated Blow-off Valve) installed.

This message has been edited. Last edited by: RIVA CREW,

Now some people can SHUT UP. RIVA always comes through

Now, i see why I am spanking my buddys RXP'S with my BIG 3 seater RXT ski, i have (the perfect combo) the Riva Vortech SC impeller along with the Riva air intake and they only have the Riva air intake with the Riva intake grate. I hope that they never read this dyno data

This message has been edited. Last edited by: Gpr/STX-15F/RXT,

Thanks RC. That is the first real data I have seen from anyone on the RXP. I can't wait to see the sheet on the full Stage II.

the stock motor baselined at only 207hp????

That sucks - to know that you have to mod the ski to get it up to the "advertised" hp rating...

I know, all motors are slightly different...but obviously the 8 hp makes a difference, or no one would be buying these parts just to get an 8 hp gain along with a pound of boost...

What is the units of measurment in the air fuel ratio? Is it cubic feet of fuel to cubic feet of air?

Thanks Riva
Now lets get the weather up here so I can ride!!
Snowed today here near Detroit!! ARGH!!

quote:

Originally posted by RayInJapan:
the stock motor baselined at only 207hp????

That sucks - to know that you have to mod the ski to get it up to the "advertised" hp rating...

I know, all motors are slightly different...but obviously the 8 hp makes a difference, or no one would be buying these parts just to get an 8 hp gain along with a pound of boost...

Been out of the office since posting the charts. That particular motor baselined at 207. We've used several motors during the course of our product development. One hit 212 and another 209.

The advertised HP rating is well within the range SD is allowed to advertise.

quote:

Originally posted by Mark S:
What is the units of measurment in the air fuel ratio? Is it cubic feet of fuel to cubic feet of air?

Not sure. I have a request in for that information and will post it as soon as it's provided.

The ratio is Stoichimetric. Stoichiometry is the accounting, or math, behind chemistry. Given enough information, one can use stoichiometry to calculate masses, moles, and percents within a chemical equation. In this case Stoichiometry is used to convert from Lambda. Lambda (Greek) is a number system based on a scale .7 (rich) to 1.2 (lean). A Lamda of 1 is equal to a ratio of 14.7:1. For our testing we use a Wide Band Commander. The sensor takes 10 samples per second. The A/F ratio is determined by how many parts of hydrocarbon and oxygen are present.

Basically, there isn't an actual "unit", but rather a ratio or quantity of molecules present.

so basically the SC impeller is not worth it? Those don't look like big gains to me? Maybe I'm wrong??

There is an increase in HP, Torq & Boost througout the entire run with only the addition of a supercharger impeller. An easy to install, bolt-on performance product that doesn't require a significant amount of down time, mechanical ability or money as compared to most other 4-stroke engine modifications.

To some the glass is half full. To others, half empty.

I will be installing mine this weekend should have my results by next weekend 03 gtxsc

Liquid’s response is typical of an untrained eye. As most of his post are.

Take a look at the torque numbers, after all this is how horsepower is calculated. Horsepower is NOT a measurable number although torque is. Through a basic formula horsepower is calculated via RPM.

Now look at the Dyno numbers from 6000rpm on up to 8000 compared the torque numbers,,, basically 138ft-lbs Vs 142Ft-lbs. Further look how flat the numbers stay.

What does this show…? From 6000rpm – on up to 8000rpm you will for sure feel the pull riding (power) difference in the to combinations..

Even a blind man can see that.. look for how flat the curve is.. that’s good power. That’s what you want in a PWC..

Only thing I question is the A/F being 11.3 from idle up.. seems real rich down low. But some data is way better than NO data..

I like data..!

I don't care what the numbers show. You can feel the difference when you bolt up the SC impeller. It's a great piece to add to your ski.

I'd love to see some data on it with the Rotax Racing equipped ECU's that are turning upwards of 8400-8500 RPM's. Seems the more RPM's the more boost = more power

4lbs of torque may be a lot on jet ski of this size. It just doesn't seem a lot to me. Sorry Nitro I'm not an engineer. I probably make more money than you though. does that make me stupid? Probably not.

This message has been edited. Last edited by: LiquidDI,

i'd like to see the intake temp's

that will show the RPM/boost cutoff point of no return. not sure if Riva has that data to post, but would like to see it.

Enough of the cheap shots. Let's keep it to the subject.

quote:

Originally posted by NitroShark:
i'd like to see the intake temp's

that will show the RPM/boost cutoff point of no return. not sure if Riva has that data to post, but would like to see it.

When I first looke at the dyno numbers I too did not see the gain. When I looked once more and rembered that torque is where you get the pull ans accleration from I now see the extra power come from. So I can see Hulk getting alittle mor pull off the line. I will probly have more pull fomr like 30-60