Solas XO w/ R&D nozzle = loss of speed?

[Rosie2514]

I'm looking for an R & D nozzle for my XP, and just got to thinking. Since my XP is stock (besides the XO), would putting the reduced nozzle on with the X0 actually cause it to turn less RPM's ?, thus slowing the top speed?

Thanks for any input

 

[Dr Honda]

Until you start tuning... it's hard to say what will happen.

in the purest sense... the smaller nozzle will increase velocity, and SHOULD make you go faster. But... in the real world... a smaller nozzle will drop your pump area... and in turn you have less "Push". Also... the smaller pump outlet will put more pressure on the engine, and in turn... it take more HP to push it. So... if you "Bog" the engine a little... and you fall out of it's peak power... you will develop less thrust pressure.


Basically... when you race... you have a nozzle with replaceable rings, so you can tune the pump for velocity, and pressure. AND... that can all be dictated by the HP you are making that day.


So... in my opinion... for a recreational rider... it's wasted money.



With that all said... what I like to do is... if it's basically a stock engine... I will use a Swirl impeller, and go up one degree past recorded... and then open the pump nozzle 1 to 2 mm. That normally will give me better out of the hole performance, and still gives better top speed.

 

[Minnetonka4me]

There is as much if not more volume in R&D nozzles due to length.

I personally love those nozzles, and even better, a set that has removable rings to fine tune it.

From everything I have read the 85/88 is the setup with any aftermarket prop.

 

[poissonn]

With that all said... what I like to do is... if it's basically a stock engine... I will use a Swirl impeller, and go up one degree past recorded... and then open the pump nozzle 1 to 2 mm. That normally will give me better out of the hole performance, and still gives better top speed.

What do you mean by going up "one degree past recorded" ? I am about to install a swirl 17/22 impeller on my bone stock XP. Would it be benefical to bore the pump nozzle by 1mm? I'm actually looking to keep about the same top speed as a completely stock ski while having a little more out of the hole...

 

[SabrToothSqrl]

I run a solas concord 15/20 on all my 951 skis. Works well for me. Cheaper than OEM, a bit quicker out of the hole too.

 

[Dr Honda]

What do you mean by going up "one degree past recorded" ? I am about to install a swirl 17/22 impeller on my bone stock XP. Would it be benefical to bore the pump nozzle by 1mm? I'm actually looking to keep about the same top speed as a completely stock ski while having a little more out of the hole...

Sorry... that should have been "recommended" not recorded. (stupid auto correct)

Giving performance tuning advice isn't easy over the net. OK... it's a stock 800 engine... but is it a 16 year old engine? OR... is it a fresh rebuild? A tired engine may be down 20 hp, but still run well.


Anyway... put in the 17/22, and see where your RPMs are at. If they are low... you can open the pump a little. This is also assuming no air leaks, and a new wear ring. If your RPMs are in the normal range... then opening your nozzle will let it bounce off the rev-limiter too easy.

 

[SabrToothSqrl]

Sorry, I misread. Your 96 is a 800.

 

[Matt Braley]

Well there has been a lot of good talk here. I think being able to read your rpms and gps your speed is very important. Then you can quickly tell us the results. I'm curious too because I understand the op's fear of overloading the engine and actually loosing performance. Remember also to look at your spark plug's color after you change things. Taxing the engine a little harder may put you a little on the lean side and you could open the needles to compensate.

 

[IDoSeaDoo]

Is it possible to bore the stock plastic nozzles?