Pump advice. ET1107.

[AWolf34]

Just finished my WDK Rip build and this thing surpassed my expectations. Thing is an animal. I believe I'm having pump issues though. Anytime i try to do a trick off idle or get deep into my setup wake at a slow speed, the ski doesn't want to move. The power is there, but somethings not right. My setup: ET1107, total loss, PFP, Novi 48s, PHP intake, OEM 155 pump (9/16 prop, stock cone, stock nozzle bore). I can't afford a 155 mag until next year, so I have to make the best of this for now. Any advice will be greatly appreciated.

 

[Just4Fun]

Pump sounds close, I'm running an 1107 with a OEM 155
Tbm stuffer 9/16 cut back thinblade.
91mm exit nozzle and stub cone.

Try reducing the water into you're water box could be filling up when idling around.
What's you're pop off/ needle and seat size?

 

[AWolf34]

Reduced water into the pipe already. Seemed to rev a little quicker. It does stumble every now and then when under a load like that. Almost sounds like it might be gargling extra fuel. I'm not sure what I have in there, as far as pop off and needle and seat. I do know that my jetting is 130 low and 137 high. I can check the other stuff when I get home from work.

 

[Rowley286]

This ski hits hard AF but doesn't have the boost it should. I'd pull that stock bore nozzle and bore it to 89-90mm and it might wake that pump right up.

 

[SpaceCowboy]

This ski hits hard AF but doesn't have the boost it should. I'd pull that stock bore nozzle and bore it to 89-90mm and it might wake that pump right up.

Yes, sounds like the pump is tight.

 

[Just4Fun]

Reduced water into the pipe already. Seemed to rev a little quicker. It does stumble every now and then when under a load like that. Almost sounds like it might be gargling extra fuel. I'm not sure what I have in there, as far as pop off and needle and seat. I do know that my jetting is 130 low and 137 high. I can check the other stuff when I get home from work.

I would find specs for reverse jetting might be lean at low throttle if its hesitating. If it's gurgling and then cleans up you're jetting is rich. Test you're pop off, Should be around 20 psi with 2.0 seats.
That motor will pull A 9/16 with stock nozzle bore, just wouldn't be optimal. I originally ran a 10/16 with OEM stator no tbm and 88mm bore stock cone. Motor pulled hard top to bottom no hesitation, I'm charging also.