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| R34 Nissan Skyline GT-R in Bayside Blue sold by Toprank |
According to Reimax, the OEM RB26dett water pump flows 160 l/min or 42 gallons per minute. The N1 pump flows 192 l/min or 50 gallons per minute. They say their High Flow Water pump flows 221 l/min or 58 gallons per minute. None of this is given with an rpm, so we will just have to assume that it is maximum flow.
ADVANCED COOLING SYSTEM BASICS FROM STEWART COMPONENTS
- Higher coolant flow will ALWAYS result in higher heat transfer. Coolant cannot absorb heat after it reaches it's pressure corrected vapor point. Furthermore, coolant absorbs heat at a progressively slower rate as it approaches this point
Stewart says more flow always equals more cooling. However the faster you turn a water pump, you can create cavitation. Cavitation is little air bubbles that are a lot more damaging than it sounds. So an RPM number with the flow would have been nice to have. At 42,000 yen for the pump, the price is about quadruple an OEM pump, and more than an N1 pump.
"We have commercialized a prototype for race engine development. By brushing up the impeller shape, a high flow rate that exceeds not only the STD but also the N1 specifications is realized, and the cooling performance is improved by increasing the amount of circulating water in the radiator. It also leads to further improvement in cooling efficiency of sports radiators with increased capacity."
 STD |  N1 |  HIGH FLOW | |
| Outer diameter | φ64 | φ70 | φ70 |
| feathers | 8 | 6 | 8 |
| Shroud | N/A | A | A |
| Discharge rate | 160ℓ/min | 192ℓ/min | 221ℓ/min |
Application：RB26（All Year's model）
Item No：21010-AAN01
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