Safe WPSI?

[Flippinfreak]

Got some prop work done and I'm ready to dial in a new set up. What is a safe water psi to keep my HPDI at?

Thanks Guys!
Mike

[LegendMan]

3-7 idle, 12-15 midriange, 17-25 full pin

Some guys only get 10-15 full pin. I would like to see atleast 15. I get 20-25 WOT depending on water temp.

[pnut]

in cold water mine is in the lower 20's at wot.summer when water is hot lucky to see 14 at wot,0 to 1 at idle.new water pump last summer to see if it would help.nothing changed.mech. said if no alarm run it do to the water temp. the thermastats are wide open so you have low water press.when i first leave the dock the pressure will be higher till the motor is good and warm ,then it will have the lower pres. the rest of the day.don't let it warm up a long time and just run about 3000 rpm and see if the pres. is higher.so far no problems.

[Neilslure]

I read somewhere on Yamahas website that Min PSI at WOT is 11PSI. I have run my motor at all different heights and never had to worry about even being close to being too low on PSI.

[SkeeterJohn]

Same here water pressure always remains high for me due to the low water pickups on the hpdi.

[spider1]

If you stay above 10 psi you will be ok. Most boats can not handle the motor that high and you will never see water pressure that low. The exceptions are Strokers and maybe Bullets. Storkers can run as high as 3+ above the pad and the Bullets can get as high as 2+ above. These boats can run the water pressure on down. I have run mine as low as 5psi for short high speed runs without a problem. But to long and the temp alarm will sound and bring the motor to an idle.

Now that is for the 3.3 HPDI motors. Not sure about anything else.