Impellers other than factory but factory pitch, Which to buy?

[J-RAD]

I would like to see a real world side by side holeshot and midrange punch race to see the comparison
Same fuel/ weight load etc..

I can confirm some of @swatski's findings. The sound is noticeably different. I suspected it was maybe just an RPM variance. My wife also mentioned this difference.

I also noticed a sportier feel in the mid range when adding throttle. Just more responsive in general. I boat at 4500ft elevation and despite having done the ribbon delete, I never reached RPM's above ~6,850 and never saw a top speed over 44mph. That top speed was only achieved when running light with just the wife and I. I had Glen at Impros pitch my 6CW's for altitude, which would cause my results to vary from @swatski's results. My new top speed fully loaded increase to 45.2mph as confirmed by the Ridesteady system which before was about 41 to 43. Max RPM increased to ~7,500. No cavitation and equal or better performance while ballasted.

I agree that the side by side would be interesting, though difficult to duplicate the circumstances precisely.

 

[swatski]

I can confirm some of @swatski's findings. The sound is noticeably different. I suspected it was maybe just an RPM variance. My wife also mentioned this difference.

I also noticed a sportier feel in the mid range when adding throttle. Just more responsive in general. I boat at 4500ft elevation and despite having done the ribbon delete, I never reached RPM's above ~6,850 and never saw a top speed over 44mph. That top speed was only achieved when running light with just the wife and I. I had Glen at Impros pitch my 6CW's for altitude, which would cause my results to vary from @swatski's results. My new top speed fully loaded increase to 45.2mph as confirmed by the Ridesteady system which before was about 41 to 43. Max RPM increased to ~7,500. No cavitation and equal or better performance while ballasted.

I agree that the side by side would be interesting, though difficult to duplicate the circumstances precisely.
View attachment 104863

View attachment 104864

This is such a striking result, the winner for sure. We were doing barely 41mph at 7,100RPM, top, on Lake Powell earlier this year in cool weather. @Williamsone46 first suggested that 6CW swap and apparently that’s what some dealers there have been doing.

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[jcyamaharider]

I am still blown away with the results that we have. With full ballast the other day I got up to 33mph moving people to the front of the boat. We had to make a quick trip back to the marina and I didn't want to unload. I just said we will see what it will do.

 

[J-RAD]

This is such a striking result, the winner for sure. We were doing barely 41mph at 7,100RPM, top, on Lake Powell earlier this year in cool weather. @Williamsone46 first suggested that 6CW swap and apparently that’s what some dealers there have been doing.

—

Yes, it was @Williamsone46 that firsts mentioned this at the beginning of last season. It's funny though, because he said my dealer, South Valley Motorsports was doing this in the 242 e series boats because of the larger tower/bikini etc... what's funny is, when I talked to the service manager he wouldn't admit to using them and basically acted like he had no time to talk to me. Maybe they're trying to keep it quiet? Maybe this secret performance upgrade gives then a leg up over the other dealer an hour north? I don't know, but Glen at Impros was an allstar about it. Likewise he didn't know the 6CW's he'd been pitching for South Valley were being used on the 242's, but we discussed it a while and went for it. I was sure to share my results with him.

 

[scot71]

I am still blown away with the results that we have. With full ballast the other day I got up to 33mph moving people to the front of the boat. We had to make a quick trip back to the marina and I didn't want to unload. I just said we will see what it will do.

No doubt that moving my 275 lbs to the front definitely helped this endeavor. ?

 

[InmyElement]

I have SPRING FEVER!! and Thankful..so far not the other Fever!

You guys have done a great job convincing me..Thank You for the write ups! I'm going to switch out impellers for the 6CWs, install Lucky 13 cones, and just learned about the ribbon delete. I only care about surfing..and could care less about top speed. I'm too old for that WOT stuff..lol

I'm getting there..I have all the @Cobra Jet Steering LLC equipment, @Ridesteady, @J-RAD's Transom Watersports, utilizing the Wake Wedge and Fatsac setup..hopefully after this upgrade, the Universal Wake Wedge. This forum is priceless and expensive at the same time..

I'm very excited for these new mods..it is like @swatski's statement "watching impeller porn"..lol

If I'm correct, I see @jcyamaharider did not replace his impeller wear ring housings when he upgraded to the 6CW's. So, its not a required swap out when you install the new impellers, unless you have excess wear between the impellers and wear ring? You would think it would be a good idea, but not cheap, to start out with a perfect clearance of new impeller to new wear ring or maybe I'm wrong...your insight would be appreciated.

@swatski and @J-RAD did you guys swap out your impeller wear ring housings or keep original?

I just pulled my impellers for the first time..wow that was easy! I'll be doing that more often. I forgot to measure the gap distance when the impellers were in the housing..I'll do that today..003. I didn't see any issues or signs of abnormal wear on the ring or impellers. I've had this slight slight rattle I believe from the starboard drive line.. just when I'm in idle forward, as soon as I apply a touch of throttle (pressure) it goes away...kinda like there is some play within the driveline...maybe acces wear in the wear ring to impeller? I'll check it out.

I got the spline tool, going to Home Depot today to see if I can find the pass through Husky wrench..its 1" 1/16"...correct?

Bearings look and feel good for 4 years and about 200 hrs (all freshwater)..I don't think I need to replace the bearings. I'm going to order some o-rings for the cones for back up..OEM o-rings also fit Lucky 13 cones, right? Recommended grease/gear oil mixture and gasket maker. I see @Cobra Jet Steering LLC uses heat silicone sealant when replacing the cones...I might try that. I like the idea of creating a slurry mix of grease and gear oil to lubricate that forward bearing...I over do it on lubrication with everything on this boat...lol. I've had people complain I wax it too much..no broken bones..

If I'm missing anything please let me know?

Any other tips or tricks would be appreciated..

Thanks!

 

[swatski]

@swatski and @J-RAD did you guys swap out your impeller wear ring housings or keep original?

Sounds like you are on the right track! Damm... I miss the mods and the excitement of early Spring, this year sucks for us as we are moving, but I will catch up with all you other jetboaters, lol.

I have had both, the OEM and the plastic insert wear ring. The plastic is fine and significantly more quiet but it is also more vulnerable. Given your impeller/wear ring clearance specs are right on I personally wouldn't mess with it.

Later in the season, if it comes to it, I'll be "blueprinting" (sealing/porting) my pumps with the special pump epoxy paint/sealant. In my experience the pump sealing, and general pump "hygiene", is the key in fighting cavitation. The 6CW impellers are the bomb. They are bigger, somehow, and they will put a big smile on your face when you push the throttles down, provided everything else works great.

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[J-RAD]

@swatski and @J-RAD did you guys swap out your impeller wear ring housings or keep original?

I got the spline tool, going to Home Depot today to see if I can find the pass through Husky wrench..its 1" 1/16"...correct?

I did not replace the wear ring on mine.
The wrench size sounds correct.

My advice would be to try just the impeller swap first. You might find changing cones is not necessary... but I am interested in what difference they make with the 6CWs.

 

[jacoviii]

I was going to do the 6CWs first but I got a smoking deal on a set of L13s. So now I need it to warm up a bit. Run the boat stock. Then with the cones. Then on to find a deal on the 6CWs.

 

[WildCatFan54]

YES you did !! lol

 

[jcyamaharider]

IMO I would do the 6CW before the lucky 13 cones. I seen the most change with the impeller upgrade.

 

[Skott1576]

Doing 6cw impellers and lucky 13 cones on my '18 242x. Can anyone tell me what you ended up with spacers on the cone. I feel like it will be hard to dial in with the engine sync on the e series boat.

 

[jaburt]

What is the spec on the clearance between the impeller and wear ring?

 

[yam240sx]

240 sx looking to get the 6cws .. can i just order 2 of the same and install ? no worry about the port and star sides ? thnx

 

[J-RAD]

240 sx looking to get the 6cws .. can i just order 2 of the same and install ? no worry about the port and star sides ? thnx

I think that's what @jcyamaharider did. There was a time, but I don't think Yamaha pitches the impellers differently port and starboard anyone. If you were to have then custom pitched as I have done for elevation they (Impros) will pitch them slightly different per side.