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Pump slipping still from Dig

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69kona

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« on: July 21, 2016, 08:26:41 AM »
Ok I put a Inducer in my pump. In order to  help my "take off "  . I was having slipping problem from a dead stop but the inducer helped a little . But still has some slip..
Would this be a Loader problem  or ?
Thanks


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GT Jets

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« Reply #1 on: July 21, 2016, 08:31:28 AM »
No.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

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Ray

69kona

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« Reply #2 on: July 21, 2016, 08:33:50 AM »
GT where do I start checking ?? Packing glad


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GT Jets

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« Reply #3 on: July 21, 2016, 08:35:04 AM »
Can you take a bunch of pictures?

Where are you located?
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

69kona

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« Reply #4 on: July 21, 2016, 08:35:18 AM »
Clearance was checked before assembly..


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GT Jets

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« Reply #5 on: July 21, 2016, 08:36:26 AM »
What does it actually do?

Walk me through what you see on the tach.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

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steves86ta

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« Reply #6 on: July 21, 2016, 08:41:59 AM »
Ive talked to some of the higher hp guys, and was told when they launch itll still slip past the WOT rpm just a tiny bit then come down quickly
1980 Bahner 21' Mini Day
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FordLover

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« Reply #7 on: July 21, 2016, 08:55:43 AM »
Dont claim to be a big hp guy, but mine slips when I WOT from a dig and bounce the limiter. Have to work the throttle. Plus the aluminum impeller probably dont like it much anyway.

GT Jets

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« Reply #8 on: July 21, 2016, 08:57:47 AM »
Dont claim to be a big hp guy, but mine slips when I WOT from a dig and bounce the limiter. Have to work the throttle. Plus the aluminum impeller probably dont like it much anyway.

Look up throttle delay.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

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Ray

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« Reply #9 on: July 21, 2016, 09:19:42 AM »
Look up throttle delay.

I looked, didnt see much. What do you want me to look for next? Less hp? Fords are too powerful?

Just give me your cell phone number, we can talk the night away like great friends.

mash on it

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« Reply #10 on: July 21, 2016, 09:23:09 AM »
Dont claim to be a big hp guy, but mine slips when I WOT from a dig and bounce the limiter. Have to work the throttle. Plus the aluminum impeller probably dont like it much anyway.

Glenn-

Why is it that there are so many boats/pumps doing this? (Steve's, Fordlover's and 69Kona), And mine doesn't?

~500hp 454, AA American Turbine impeller, alum. in a JC pump, with diverter and rideplate/shoe and loader.

Top end 4900-4950 r's, and out of the hole 5050 to 5100, maybe. Because its a heavy ass daycruiser?

There was a difference between the Berk 2A ant the AT 'AA' of ~100 rpm (now its lower) The Berk impy definitely slipped some, out of the hole. The wear ring was at .090" (.045 a side) on the Berk impy. The AT is at .024" (.012" a side, or was in Jan. of '14)

Dan'l
CJ/RR 212...under construction  "Pistol Annie"

69kona

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« Reply #11 on: July 21, 2016, 09:38:06 AM »
Hit the throttle it slips and hits 5400 then drops to 5100  ...after going..
So ?


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steves86ta

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« Reply #12 on: July 21, 2016, 09:40:42 AM »
Hit the throttle it slips and hits 5400 then drops to 5100  ...after going..
So ?


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If i remember right, Dennis said his slips by a few hundred rpm then comes down. it wasnt as much as mine slips but it was still some
1980 Bahner 21' Mini Day
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69kona

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« Reply #13 on: July 21, 2016, 09:41:16 AM »

Can you take a bunch of pictures?

Where are you located?
This weekend I'm hitting the river ill post video ..
If u  have any insight on the problem let a brother know ... Because I'm starting to give up on my hole shot lol


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GT Jets

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« Reply #14 on: July 21, 2016, 09:41:44 AM »
Hit the throttle it slips and hits 5400 then drops to 5100  ...after going..
So ?


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Leave it alone.

The pump isn't loading until the hull moves forward.

Your engine package is making too much hp in the mid level,  the curve is likely skewed for pulling a gear, you might see what it does with another couple more degrees of cam timing.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

GT Jets

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« Reply #15 on: July 21, 2016, 09:43:25 AM »
Glenn-

Why is it that there are so many boats/pumps doing this? (Steve's, Fordlover's and 69Kona), And mine doesn't?

~500hp 454, AA American Turbine impeller, alum. in a JC pump, with diverter and rideplate/shoe and loader.

Top end 4900-4950 r's, and out of the hole 5050 to 5100, maybe. Because its a heavy ass daycruiser?

There was a difference between the Berk 2A ant the AT 'AA' of ~100 rpm (now its lower) The Berk impy definitely slipped some, out of the hole. The wear ring was at .090" (.045 a side) on the Berk impy. The AT is at .024" (.012" a side, or was in Jan. of '14)

Dan'l

I bet of you look at it,  your hp/torque curve is more linear. Makes the most hp near the top of the rpm scale.

Just a hunch.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #16 on: July 21, 2016, 09:45:41 AM »
Lee,
I am not convinced you haave an issue.

HAve to remember, you have a bottom that wasnt exactly built for speed (like mine) and the boats heavy...

These other guys you see launching out of the hole are 4-700 pound boats.... Takes a lot less effort to move that than ours

A few hundred rpm on the hit. I think thats pretty much expected.
1980 Bahner 21' Mini Day
1968 Rogers project

jyeager

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« Reply #17 on: July 21, 2016, 09:59:06 AM »
We have launch control on the race boat for about 1 second or so off the hit to help with the slip. You should expect at least 200 rpm slip on the hit, more on the spray.
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69kona

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« Reply #18 on: July 21, 2016, 10:03:24 AM »

If i remember right, Dennis said his slips by a few hundred rpm then comes down. it wasnt as much as mine slips but it was still some
I'll have to take u for a ride .. So u can see it


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steves86ta

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« Reply #19 on: July 21, 2016, 10:06:10 AM »
I'll have to take u for a ride .. So u can see it


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Heres what mine does

1980 Bahner 21' Mini Day
1968 Rogers project

69kona

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« Reply #20 on: July 21, 2016, 10:06:28 AM »

I bet of you look at it,  your hp/torque curve is more linear. Makes the most hp near the top of the rpm scale.

Just a hunch.

GT
Your probably on to something...


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FordLover

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« Reply #21 on: July 21, 2016, 10:10:31 AM »
Your probably on to something...


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X2. Makes sense.

69kona

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« Reply #22 on: July 21, 2016, 10:10:42 AM »

We have launch control on the race boat for about 1 second or so off the hit to help with the slip. You should expect at least 200 rpm slip on the hit, more on the spray.
👍👍👍


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steves86ta

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« Reply #23 on: July 21, 2016, 10:14:57 AM »
X2. Makes sense.

Its an interesting theory... drop the powerband down to make power earlier. May not cause it to slip as hard...

I tried to advance my cam timing, but ran out of PTV
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« Reply #24 on: July 21, 2016, 10:17:22 AM »
No jet expert but leave it alone. My boat runs right at 6100 on motor and full stab from a dig it will hit 6400 then settle back down within a second. Like GT said pump isn't loaded at idle.


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