22 GP1800R SVHO cooling + impeller

[Ncmandolfo]

Hey guys first post so be kind, still very much a noob.

Been modifying my ski (GP1800R SVHO) for this summer and just looking for some more in depth advice. Last year I ran it stock so this is the first year it's been modded. So far I've done Intake, through hull, ribbon delete, and 8600 tune. Took the ski out and holy shit it's fast, wow did it wake up from stock. It hits 80mph with just me on it and that's PLENTY for me. Just to be clear I have no desire for more power at this point, just reliability. The only upgrades I have planned from here on out is a BOV, cooling upgrade, and possibly impeller.

So that leads me to my first question. There is a lot of kits out there for cooling upgrades but not sure what's necessary. It gets hot where I live, 110-115° is not uncommon. I took it out once already but it was a cooler day and lake water is still on the cooler side. That being said I was still reluctant to abuse it. I'd rather avoid doing an intercooler if possible, I'm just trying to mitigate heat soak and avoid cracking the block. So far I beleive I've seen people drilling out a T fitting to run larger lines, and adding in a new seperate line straight to the block? Is this simple to DIY or is buying a kit necessary, if so what kit would you guys recommend? The Riva kits I've seen seem a bit rediculous, like $250 for some new hose and an adapter.

Next question, impeller. Again I'm happy with the speed of the ski now, it's supposed to be a family ski but that reality is slowly disappearing lol. I've seen people say the twin impellers are pretty amazing but just want some more imput from guys with similar set ups that have changed impellers. Again not looking for anything faster than 80mph, if it did 75mph but was much faster out of the hole and had less cavitation I would be happy. For me the arm ripping acceleration is more enjoyable than straight line top speed runs. So yeah, specifically interested in the twin impellers and want to know your guys take on what pitch would be right for me.

Thanks in advance

[chris1200]

There are many discussions on the cooling topic, with the mods you have you should be fine drilling the T fitting alone. If you are looking for arm ripping acceleration without cavitation do the riva intake grate

[K447]

… acceleration without cavitation do the riva intake grate

The Solas impeller also really helps

[thomasdjames1]

Hey guys first post so be kind, still very much a noob.

Been modifying my ski (GP1800R SVHO) for this summer and just looking for some more in depth advice. Last year I ran it stock so this is the first year it's been modded. So far I've done Intake, through hull, ribbon delete, and 8600 tune. Took the ski out and holy shit it's fast, wow did it wake up from stock. It hits 80mph with just me on it and that's PLENTY for me. Just to be clear I have no desire for more power at this point, just reliability. The only upgrades I have planned from here on out is a BOV, cooling upgrade, and possibly impeller.

So that leads me to my first question. There is a lot of kits out there for cooling upgrades but not sure what's necessary. It gets hot where I live, 110-115° is not uncommon. I took it out once already but it was a cooler day and lake water is still on the cooler side. That being said I was still reluctant to abuse it. I'd rather avoid doing an intercooler if possible, I'm just trying to mitigate heat soak and avoid cracking the block. So far I beleive I've seen people drilling out a T fitting to run larger lines, and adding in a new seperate line straight to the block? Is this simple to DIY or is buying a kit necessary, if so what kit would you guys recommend? The Riva kits I've seen seem a bit rediculous, like $250 for some new hose and an adapter.

Next question, impeller. Again I'm happy with the speed of the ski now, it's supposed to be a family ski but that reality is slowly disappearing lol. I've seen people say the twin impellers are pretty amazing but just want some more imput from guys with similar set ups that have changed impellers. Again not looking for anything faster than 80mph, if it did 75mph but was much faster out of the hole and had less cavitation I would be happy. For me the arm ripping acceleration is more enjoyable than straight line top speed runs. So yeah, specifically interested in the twin impellers and want to know your guys take on what pitch would be right for me.

Thanks in advance

Since your ski is newer the Riva cooling upgrade kit for the stage 1+ kit will only drill out a T-fitting and drill out the X-fitting. This pushes more cooling water to the oil cooler and more water to the intercooler.

You can look in the Riva directions and see how to do it. Also, be careful as the drill bit sizes were listed backwards in the directions with my kit. If you pull out both the X-fitting and T-fitting you will see one drill size will remove material from the T-fitting but not the X-fitting. Use this bit size for the T-fitting and the other larger bit use for the X-fitting. If you use the larger bit for the T-fitting as well I think the wall thickness of the T-fitting would be greatly compromised.

However, the Riva cooling upgrade kit is only $21.95. I would just buy it so you know you have the correct drill bit sizes!

Do not confuse this with the Riva cooling kit made for use with their intercooler.

Additionally, if you run the Stage 1+ low octane tune this will pull back timing some and provide for a more conservative reliable ride.