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cavjock97

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Posts: 30
Reply with quote  #1 
I'm still trying to determine why I can't get more RPMs out of my '06 250.  I have a 21 pitch Rebel on my 224 Blackjack and can only get 5200 RPM at WOT.  This prop is pitched lower than others I have talked to with similar set ups.

What got me thinking about the TPS is my hole shot is awesome, it does not seem to me that the engine is lugging at any speed, the speed at 3000 RPMs is 30 MPH. 4000 RPM is 40 MPH and 5000 RPMs is 50 MPH.  It just feels like there is more there, but I can't access it due to running out of throttle.

My diagnostic shows not faults associated with TPS and shows TPS Cal value of 5.

Any input is appreciated.

-CJ97

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CJ97

E250DPXSDR
05127630
Blackjack 224

Laguna Madre, Texas Coast
seahorse

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Reply with quote  #2 
just off the top of my head, a 21" Rebel is a fairly large pitch for a single engine.

What is the boat weight, hull shape, and top speed?  Are you using a digital tach or analog? It may be a good idea to have it checked for accuracy using the diagnostic software? The software can also show the TPS voltage at full throttle to be sure the EMM "sees" that.

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ElderSparky

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Reply with quote  #3 
TPS cal value won't have any effect on WOT condition.  As stated, look at TPS % with EvDiag to verify the engine is seeing wide open condition.
cavjock97

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Reply with quote  #4 
Boat is a 224 Blackjack.  Dry weight is 2,000 pounds and fully loaded weight is around 3,800 with three big guys.  The Blackjack has a 15 degree dead rise and I am using an icommand gauge.

Thanks!

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CJ97

E250DPXSDR
05127630
Blackjack 224

Laguna Madre, Texas Coast
PhilH12

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Reply with quote  #5 
The above suggestions would be first, but a 'random thought' - have you confirmed that the throttle cable is adjusted so that the throttle arm is touching the 'stop' on the motor at WOT?

Phil

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20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
stimpy

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Reply with quote  #6 
You might want to read this post.

http://www.etecownersgroup.com/post/tps-voltage-and-throttle-link-adjustment-8215529?pid=1293209116

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Silver Hawk 520. E-Tec 90 hp, E90DPLSRC, s/n 05071973, Powertech RED 17"
Fishinfinatic

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Reply with quote  #7 
I would definitely do all the necessary checks that  these guys have suggested but for comparison I'm running a Triton 224 LTS with the same motor. I get 5800  rpm  with a 19 pitch Tempest Plus with a normal fishing load and great holeshot.21 pitch viper was too much, knocked RPM down to 5200 to 5300 and a slightly reduced holeshot. Ive settled on a 20 pitch Mercury Inertia. I get right at 5500,with a good holeshot.RPM is on I command gauge, my analog tach is about 250 rpm lower at WOT.
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cavjock97

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Reply with quote  #8 
Thanks, Everybody.  Fishnfnatic, what kind of speed are you getting with the 20 pitch Merc prop?  I get right at 5500,with a good holeshot

-CJ97

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CJ97

E250DPXSDR
05127630
Blackjack 224

Laguna Madre, Texas Coast
Fishinfinatic

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Posts: 81
Reply with quote  #9 
 Cavjock97, I see about  53 on average WOT. Cruise about 38 at  4000.
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crabby

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Reply with quote  #10 
My boat is an old big butt Boston whaler outrage 22 with full transom/whaler drive, pushed by a 2009 250hp ETec swinging a 15 inch pitch rebel prop; with 35 gallons of fuel two guys and a big dog I'm spinning 5900+ rpms.
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2004 90hp ETEC/17 BW Montauk, 15 pitch Stiletto
2009 250 3.3l ETEC/22 BW Outrage with Whaler Drive (bracket), 15 pitch Rebel
rideoutr

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Reply with quote  #11 
cavjock97,
Are you running an adjustable jack plate?
if not have you checked the motor height?
The av plate should be out of the water when planed out...
just a thought that wasn't mentioned

Rick

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cavjock97

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Reply with quote  #12 
I do not have a jack plate, but i'm about to raise the motor on the transom to see if that has any effect.  everybody I've talked to tells me that a jackplate is necessary to get the most of the Blackjack.
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CJ97

E250DPXSDR
05127630
Blackjack 224

Laguna Madre, Texas Coast
Searider

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Reply with quote  #13 
I was running on a RIB with around 3000 pounds  a 21 pitch Rebel and was way overpropped . WOT was also in the area of 5200 / 5300 rpm .
Now I am running a lower pitch Cyclone 4 blade which is spot on .

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cavjock97

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Reply with quote  #14 
Raising the motor helped a little. With the wife and three kids, 40 gallons of fuel, 5 batteries and trolling motor I was able to get 5500 RPM at 54 MPH.  That Rebel prop is impressive in how high you can raise it out of the water and still have it grab.  I'll probably put on a 6" Bob's this off season and see how that goes.  Thanks for everyone's input.

-CJ97

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CJ97

E250DPXSDR
05127630
Blackjack 224

Laguna Madre, Texas Coast
PhilH12

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Posts: 3,503
Reply with quote  #15 
I love when a story has a happy ending!  Down 'south', you've still got a year's worth of 'testing' to do.  [smile]

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
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