GreenHulk GP1800 / VXR Intake Grate Shootout

[Spiiz]

Thanks for a great video and detailed thread.
I noticed on the ride plate you have a block off over the paddle wheel cutout.
Can I buy one from the gh store?
Do you tbink it makes any difference?
Love your fantastic work Jerry... Please keep it coming ����

[not2fast]

Great work! TNT is not easy work on cars let alone water. Jerry thank you for the review and pointing me in the right direction on my VXR.

[SpeedJunky]

Thanks for doing the testing Jerry!!


I am leaning toward the R&D unit because I believe once you seal it up properly you will see an improvement on the accel numbers and possibly top speed.

Wonder if a back to back test off the RIVA grate without factory seal vs seal would be possible?
That would tell us how much that seal effects the numbers.

Will you be staying with the Riva unit on your ski?

[K447]

...

Wonder if a back to back test of the RIVA grate without factory seal vs seal would be possible?
That would tell us how much that seal effects the numbers.

...

Any intake grate that is not fully sealed to both the transom plate and to the ride plate front edge can leak air into the jet pump and reduce acceleration from low speeds.

Removing the factory rubber sealing strip (without replacing it with some other sealing method) would undermine the performance of the Riva intake grate, or any other grate.

Testing of incompletely sealed intake grates is not useful information, for acceleration comparisons.

[SpeedJunky]

Testing of incompletely sealed intake grates is not useful information, for acceleration comparisons.

The worx and R&D in the test above had no rubber seal when tested!!!!
Was just wondering how the Riva accel numbers would change.

[K447]

The Worx and R&D in the test above had no rubber seal when tested!!!!

Was just wondering how the Riva accel numbers would change.

The Riva intake grate would perform worse without the rubber sealing strip in place.

The Worx intake grate install instructions (when using the pump seal kit to fill the intake grate casting voids) recommends that the factory rubber seal have all the fingers sliced off, then the seal is reinstalled with the grate. I imagine the R&D install is similar.

I expect Jerry did this when testing those two grates. No seal at all would simply not work well.

[SpeedJunky]

The Riva intake grate would perform worse without the rubber sealing strip in place.

Thats the point MR Helper!!!!! what would be the chart numbers for 10-30mph and the rest off the accel numbers?

I will wait for Jerry's comment.

[K447]

... what would be the chart numbers for 10-30mph and the rest off the accel numbers?

...

Such numbers would be of no use. The test results could vary significantly depending on how much of an air gap was present, and that would vary from ski to ski, possibly differing with just a remove and reinstall on the same hull.

I would expect no useful correlation between unsealed intake grate performance and sealed intake grate performance.

[SpeedJunky]

LOL !!!

Such numbers would be of no use. The test results could vary significantly depending on how much of an air gap was present, and that would vary from ski to ski, possibly differing with just a remove and reinstall on the same hull.

I would expect no useful correlation between unsealed intake grate performance and sealed intake grate performance.

[Green Hulk]

Great tests and thank you. How would the stock grate compare? Also you said you would never run the stock grate, why is that? Thanks for all the help.

I'm glad you asked. The stock grate is terrible and I would not recommend anyone trying to run the stock grate over 80 mph due to serious safety concerns. The stock GP grate is the same exact design that was used on the 2009-2013 FZ skis and we all know that the FZ when pushed more than 72 mph with the stock grate would overstuff and toss the rider.

[Green Hulk]

any video on how to do installation on a gp1800?

Here are the RIVA intake grate Instructions are here, click here to download (same instructions would also apply to the R&D and WORX grate)

https://rivaracing.com/file/7119-RY22110+-+RIVA+YAMAHA+GP1800-VXR-VXS+TOP-LOADER+INTAKE+GRATE.bin

[Green Hulk]

Thanks for a great video and detailed thread.
I noticed on the ride plate you have a block off over the paddle wheel cutout.
Can I buy one from the gh store?
Do you tbink it makes any difference?
Love your fantastic work Jerry... Please keep it coming 

that is a block off plate I made out of a piece of aluminum. It made zero difference in speed whatsoever. I also made one for my FZ... no difference in speed on that ski either.

I'm glad you like the thread, thank you!
Jerry

[Green Hulk]

Thanks for doing the testing Jerry!!


I am leaning toward the R&D unit because I believe once you seal it up properly you will see an improvement on the accel numbers and possibly top speed.

Wonder if a back to back test off the RIVA grate without factory seal vs seal would be possible?
That would tell us how much that seal effects the numbers.

Will you be staying with the Riva unit on your ski?

I also think I will see improvements in acceleration numbers and top speed on the RIVA grate once sealed in properly.
I am sticking with the RIVA grate on my ski. It produced best results and it's made out of stainless steel. It's not breaking!!!
At these speeds, I want all the strength I can get. If a grate brakes at 90 mph its not going to be pretty!

[K447]

Here are the RIVA intake grate Instructions are here, click here to download (same instructions would also apply to the R&D and WORX grate)
https://rivaracing.com/file/7119-RY2...TAKE+GRATE.bin

instructions for the R&D, would be located where ?

[Green Hulk]

For the R&D ?

Any of the intake grates will install the exact same way!!!! Two bolts in the front/Four bolts in the back and they all fit the same hull