American turbine.

[Lund]

Heres a question... I have a325hp-350/ AT312... I feel the impeller inside the inspection hole and its a bit banged up from gravel(aluminum). I can get about 38.5mph at 4000rpm out of it at the lake( heavy-its got the frame top, wake tower, kicker, seats, wife n 3 young kids).

My question is when I replace my aluminum impeller with a steel or stainless steel($) impeller how much performance gain will I expect to achieve? Thanks from a rookie.

The impeller can easily be cleaned up, i do mine every year usualy at the beginning of the year and inspect the wear ring at the same time. Very easy to do, only take 2-3hrs to do it all. Clean, shim if needed and bearing replacement if needed. Gives you peace of mind.
The stainless are great, they don't get banged up as easily but as long as you run in clean water and not skinny with debri. They can heavily damange the drive on the boat if you were to suck up something solid and yes you can in fast water.
Performance gain are minimal, mostly because the stainless maintians its leading edge much much longer while the aluminum needs attention(cleaning up).
If you run lakes and deep rivers, stainless if great. If you occassionaly run shallow and spring runoff water, aluminum is much safer.

 

[Joholio]

Ok next question... How doo I get my boat to go 50? Hahaha

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$?

 

[Lund]

Ok next question... How doo I get my boat to go 50? Hahaha

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$?

Hahaha, are you serious?
I cannot imagine mine doing 50mph and i run a 14deg hall. I think your's is 12 isn't it?
Mine will run 41-42mph, plenty fast for a whitewater boat, they get way too unstable imo otherwise.
To answer the question, a different pitch impeller, more agressive, but then your going to lose in hole shot and carrying capability.
You can also change the nozzle sizing, bigger nozzle lower top end, smaller nozzle higher top end. But there is sacrifices eigtherway.

 

[Joholio]

11 degree. And yes I'm serious about 50mph. I'm not afraid! Lol! I've went 90+ in my buddies old race boat. And 70-80 lots of times in a few other tubs too. NBD.

I really just want to do 45. So I don't suck wake behind buddies 37' cabin cruiser with twin 5.9 Cummins at Sicamous later this summer... It will go 44! Lol

 

[tex78]

Yep. It's the old beat the buddy issue.

I will unhook one injector on his boat.

He will be down to 42.

sent from my I phone azz kicking HTC

 

[Lund]

OMG, your too funny, looking for 1-2mph. Maybe a stainless is in order for you lol.
Just remember the boat was never design for that and what you gain in the top expect to loose in the bottom. hehe

 

[Joholio]

Yeah, best have a sense of humour if your going on the river! Lol! It can be a long old day pretty quick, so I've heard...

5 mph might have got me over that last bar...lol

 

[pfi572]

Drop weight out of boat is the best . Weight in boats is the same as sledding.
If impeller and wear ring are good cut impeller down to get 350 into the 4500 rpm range.
Will increase top end but loose mid and bottom end.
Like Lund said all it does is move things around in regards to the RPMs .
Big block, big impeller and lots of torque = everything your after. Lol

 

[Lund]

Yeah, best have a sense of humour if your going on the river! Lol! It can be a long old day pretty quick, so I've heard...

5 mph might have got me over that last bar...lol

It can, i was stuck in the middle of the Fraser river one afternoon. HAHA.. when the water is flowing past you at 15+mph and your stuck on gravel in 4" of water in the middle of the fraser river, its bitchin. I just slowed down at the wrong time. BTW the Fraser has ZERO visibility so you never know where the bars are. At least i wasn't high and dry....that realy SUCKS.

 

[Joholio]

How did you get off the bar Lund?

 

[Lund]

How did you get off the bar Lund?

There were 3 of us, my wife and a buddy of mine. Buddy and me went into the water and pushed, the current helped alot even though there was only 4" of water, just the fact there was water was a huge help. On dry ground its a whole different ball game.
You cannot run the motor as the pump will suck the gravel up and plug up, it was already semi plugged from trying to get off.
Once we managed to get the boat floating lighter in the back by transfering weight we lifted and pushed and the current took over. A problem on the fraser is you cannot see 1" into the water its so muddy, we almost lost my buddy cause he stepped off the bar and went in, current picked him up but luckily he held on to the boats jet guard so i was able to pull him up.
I managed to scamble into the boat once it was freed and buggering off by the current, my buddy didnt haha. Close call.

 

[Lund]

Joholio, i got a sudguesstion, why not supercharge it?? haha
The 5.7 takes well to a supercharger with 7-8lbs boost no engine mods needed, runs on 91oct. Simple, then you'll do that magic number you want "50mph".

 

[tex78]

Ya ...I agree.

Good idea.


Think of the instant accel holyooo




I'll help ya put it on too.



sent from my I phone azz kicking HTC

 

[Joholio]

I still need "help" to put gripnrips on the XM... And I'd best get my ass to work to pay for it all too!

:effinthaD:

 

[tex78]

Yes.

U better

sent from my I phone azz kicking HTC

 

[Lund]

I've tried a few times to figure what's more $$$ to do, the sledding or jetboating haha.
Why oh why did i fall for this, i am broke 365 days a year now.....

 

[tex78]

Ah u have lots of pocket change mike.

U can't fool this guy.

sent from my I phone azz kicking HTC