modded rxpx problems :S help

[andrewmitchell123]

Okay so today I took my ski for the test run after modding it the last 2 days...

I installed a 4" air intake with pod, r&d grate, r&d extended steering nozzle, j pipe in the exhaust and filled the ride plate holes...

Today I took it for a test ride to find out that it hasn't got any better then before... except maybe a bit of middle range... anyways it hits about 90km 7000rpm really fast like it should then once it Hits that speed n rpm it climbs up but very slow and delayed...

It is also cavitating a little bit... has a new wear ring... the prop clearance is about .297mm... the blades r sharp. The pump seal is fine... the little green washer is looking okay...

I don't think it should be doing this... any ideas??


This ski is doing my head in! I'm ready to sell it. The cavitation has been around since I sucked up a rock 40 hrs.ago and I can't get jt fixed!!

Any help is much appreciated...

[andrewmitchell123]

Oh I forgot to mention the veins on the pump shoe snapped so I cut them out...

[STSPERFORMANCE]

did u smooth the pump shoe after you took the fins off? might wanna post a pic...

[brendus]

Try to eliminate the possible problem. I would maybe try switch back to the original intake grate. worth a shot.

[andrewmitchell123]

I smoothed out the pump shoe... I posted pics in another thread of mine... don't have them on my phone to post here...

Surely it wouldn't be the intake grate... the r&d is known for better top end...

A guy told me that it might be a boost leak why it's playing up... n to check the hoses. .. but that still doesn't explain the endless cavorting

[monaroman76]

How bad of cavitation are we talking? Have you changed the carbon seal and accordion boot? Also change the spark plugs and check s/c slip if you haven't already.

[lazsrxp]

I have my spare pump that I'm willing sell

[ADAMBOMB]

Okay so today I took my ski for the test run after modding it the last 2 days...

I installed a 4" air intake with pod, r&d grate, r&d extended steering nozzle, j pipe in the exhaust and filled the ride plate holes...

Today I took it for a test ride to find out that it hasn't got any better then before... except maybe a bit of middle range... anyways it hits about 90km 7000rpm really fast like it should then once it Hits that speed n rpm it climbs up but very slow and delayed...

It is also cavitating a little bit... has a new wear ring... the prop clearance is about .297mm... the blades r sharp. The pump seal is fine... the little green washer is looking okay...

I don't think it should be doing this... any ideas??


This ski is doing my head in! I'm ready to sell it. The cavitation has been around since I sucked up a rock 40 hrs.ago and I can't get jt fixed!!

Any help is much appreciated...

Why would you put a J pipe on a RXPX?

[imp0ster]

Bad knock sensor?

[troyheb]

What rpms are you seeing max?
As Adam asked. Why would you put a J pipe on the ski?
Me thinks you have exhaust or boost leak.

[Ocman]

Re: modded rxpx problems :S help

Why install a jpipe.. you just went back a step.

[Water4fire]

Boost leak!
OH and GO back to the X Exhaust you lost some R's wright there for sure.

[imp0ster]

I bet there's no J-Pipe and he's using the wrong term. He'd have to buy a smaller V-Band clamp, coupler, worm clamps and a completely different waterbox. Who the hell would ever do that?

[ADAMBOMB]

I bet there's no J-Pipe and he's using the wrong term. He'd have to buy a smaller V-Band clamp, coupler, worm clamps and a completely different waterbox. Who the hell would ever do that?

andrewmitchell123 <---------

[beerdart]

What is the diameter of the new steering nozzle?