What to do next? RPM / MPH don't seem right.

[UNCLE SAM]

My boat is a Taylor SS, Fresh 455 Olds that will survive @ 5000rpm. Fresh Berk E with an American Turbine AA. Has a Place Diverter . I currently GPS 60 MPH @ 4900-5000 RPM. (tach is accurate) RPM seems high for 60MPH to me. What do I look at next? Shoe /Plate? or better loader. I have one of those angle iron ones in it.

[pattymelt18]

cut the impeller

[UNCLE SAM]

won't cutting the impeller give me more RPM?

[berk]

seems like you are way low on speed. is that gps speed? i am turning 4600 on a berk A and getting 68-73 mph depending on load.

[UNCLE SAM]

That is what I am thinking Berk. I was shooting for 60-65 mph at around 4400 RPM. Sure didn't work out that way. Last year with a worn out engine & pump (A impeller) I was 55 mph at 56-5800 rpm.

[malcolm]

How heavy is that boat? I'd be happy with those numbers in mine. ;)
Seems like most Berk guys say the E pumps aren't as good as the Cs and Gs.
Talk to Duane about it, you aren't too far from him. See if that stirs anything up. :p

[UNCLE SAM]

1600-1700 lbs something in there

[malcolm]

I don't know, we always hope for more than we get. I'd say you made a step in the right direction. You gained 5 mph and lost 6-800 rpm, nothin' wrong with that! You could probably get more with some setup and bottom work.

[Cas]

does the hull have any hook in the bottom?
have you tried wedging it?
a different loader would probably be a good piece to try also.
in any case, it sounds like you need to air the boat out some more.

[Scoobinator]

Sounds like you have alot of pump slippage Id check your tolorances you probably need a rebuild.

[UNCLE SAM]

pump is good. has been checked

[lil man wayne]

Jetboat effeciency at its best.

[IMPATIENT 1]

My boat is a Taylor SS, Fresh 455 Olds that will survive @ 5000rpm. Fresh Berk E with an American Turbine AA. Has a Place Diverter . I currently GPS 60 MPH @ 4900-5000 RPM. (tach is accurate) RPM seems high for 60MPH to me. What do I look at next? Shoe /Plate? or better loader. I have one of those angle iron ones in it.
get a e pump shoe and ride plate kit from hi-tech.the 12je's starve for h2o on the top end and the shoe will keep it fed.i wouldn't be suprised to see it pick up your mph another 5-6mph, mine did!it'll plane faster, ride smoother, and be faster outta the hole, try it!!
i've got my taylor doin 80.3 on a good day!same pump you have and same bottom hull.

[flat broke]

Impatient is on the right track. With a 455, it seems like you're spinning that AA a little easier than you probably should be. This typically means that the pump isn't loading properly which will greatly reduce the efficiency of the setup. Look into a good loader first, then the shoe and ride plate if the pump is still freewheeling a little too much. Just so you know, you might only achieve a reduction in RPM with little gain in MPH, but you will have increased the efficiency of your setup which is always good.
Chris

[IMPATIENT 1]

Impatient is on the right track. With a 455, it seems like you're spinning that AA a little easier than you probably should be. This typically means that the pump isn't loading properly which will greatly reduce the efficiency of the setup. Look into a good loader first, then the shoe and ride plate if the pump is still freewheeling a little too much. Just so you know, you might only achieve a reduction in RPM with little gain in MPH, but you will have increased the efficiency of your setup which is always good.
Chris
RIGHT ON , HAVIN MORE THRUST AT LOWER RPM'S IS A GOOD THING!REALLY A GOOD THING FOR A BBO!

[UNCLE SAM]

Thanks for the input. To lower the RPM is the goal. I really don't need it to go any faster. We just use it to ski & tube, make some noise & show off. I was told to see how the pump is installed in the hull. I believe that is where the problem lies. It is too high in the hull. Above the keel & cocked to one side as well. Seems to me that would prevent the pump from loading well.