The factory closed-loop cooling system on Sea-Doo's 1630 ACE platform was designed for casual cruising. GT40Marine's Sea-Doo Open Loop Cooling Kit converts the head cooling path to a continuous raw-water circuit so tuned 230 and 300 HP builds can hold power longer under sustained load. The kit is built around marine-grade hose, billet hardware, brass fittings, stainless clamps, and an adjustable flow regulator so you can tune cooling for warm saltwater, southern lakes, or cooler northern water. Run cooler. Hold power longer. Give your 1630 ACE build the support it needs. Key benefits Converts the Sea-Doo 1630 ACE head circuit to open-loop raw-water cooling Helps reduce heat soak during sustained wide-open-throttle riding Adjustable flow regulator for water temperature and riding conditions Billet aluminum hardware with marine-grade hose and fittings Supports 230 HP, 300 HP, and 300 HP supercharged builds Direct-fit layout for RXP-X, RXT-X, GTX, GTR, and GTR-X platforms Install hardware included: clamps, O-rings, fittings, zip ties, and connectors Built and supported by GT40Marine Fitment Platform Years Notes Sea-Doo RXP-X 300 2018-2026 1630 ACE supercharged Sea-Doo RXT-X 300 2018-2026 1630 ACE supercharged Sea-Doo GTX 300 2018-2026 1630 ACE supercharged Sea-Doo GTR 230 2018-2026 1630 ACE supercharged Sea-Doo GTR-X 300 2018-2026 1630 ACE supercharged Kit contents Billet machined cover plate / housing Marine-grade reinforced cooling hose Adjustable flow regulator valve Brass 90 degree barb fitting Hose barbs and connectors Stainless hose clamps Marine-grade O-rings Zip ties and installation hardware Specs SKU GT40-OLC-SD300 Engine platform Sea-Doo 1630 ACE Supported power levels 230 HP, 300 HP Shipping weight 4 lb Condition New FAQ What does open-loop cooling do? It routes raw water through the head cooling path to add cooling capacity and reduce heat soak on hard-ridden 1630 ACE builds. Does it add horsepower by itself? Not directly. It supports the engine so tuned builds can hold their power more consistently under heat and sustained load. Is it safe for saltwater? Yes, with disciplined post-ride flushing. The kit uses marine-grade hose, billet hardware, brass fittings, and stainless clamps. Can it be reversed? Yes. The kit is a conversion parts package and does not require permanent block or head casting modification.
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