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Bass Boats/Props -
I have a Nitro 882nx DC with a Merc OptiMax, and I am beginning to wonder if
I can get a bit better performance with a different prop.Currently runs about 60 in good water with the bow trimmed up, but Nitro's
literature suggests 64-65 can be expected. Ya'll know where to start looking for information regarding propping out a
boat properly? Thanks. |
James
Feb 21 2005
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| A great program for figuring out which prop. www.jerrys-world.com/Again.txt |
Jerry
Feb 21
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| 60 -65/
Why not just buy a Hydrofoil race boat instead? |
Feb 21
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| Because we want to go fast sometimes and fish other times out of the
same boat. |
Ronnie
Feb 21
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| That's my normal cruising speed. If you have the right boat and experience,
it is perfectly normal to run like that. Besides, it's fun and gives you more fishing time.... At least that's what
I tell my wife. |
Steve
Feb 21
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| Do you really want to spend several hundred dollars for an extra 4mph? As
Bob mentioned, I'm betting 64mph is under _ideal_ conditions. |
Todd
Feb 22
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| You always want your potential out of your boat, if it's 25 or 75, don't let
the rail monkeys tell you otherwise. I sold nitros for a couple of years and rigged more than a few 882s. It's a
tweaky hull, and there are a few things you can do to help it out. Tracker usually rigs that boat with a 23 Tempest, which isn't a bad choice,
but not optimum. Normal tweak on an 882 is a 23 TRO4 Powertech, raise motor to top hole on
jackplate, install a T&H holeshot plate, torque tab and you've just about
done everything you can. This should run you up to 5,700 rpms, quicker
holeshot, take the wheel torque out, and give you your 63-65 mph you're
looking for. http://www.trackerowners.com/nitroowners/ Lot's of Nitro owners here, and
most are more than helpful. You won't get bashed for owning a nitro here
like you will on other bass boat sites. |
Pat
Feb 22
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| Well, in fact no, I don't want to spend several hundred for an extra 4 MPH.
However, I think the ideal conditions mentioned are with their stock
configuration; perhaps there's another config that will exceed that figure.
Maybe it's 8 mph. Myself, I don't know, and that's why I'm asking, to see
what's possible, and then I can make an informed choice. Thanks, Jim |
James
Feb 22
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| Pat - Thanks a lot for the information; that's exactly the type of info that will
help me decide if it's worth it. Regards, Jim |
James
Feb 22
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| This weekend's tournament was held on Toho, on the Kissimmee chain of lakes. It's a looong run to the south end of Kissimmee, from the city park on Toho
where the tournament began. The south end of Kissimmee is where the bass were caught. I tried staying in Toho, and blanked. That's why I'm trying to optimize my rig. Even if I am able to get a few
more MPH out of it, I understand that the 21 footers with the 250's and
300's are going to leave me in their wake; but it will extend my own range
and fishing time. And, as I don't have a spare prop for my boat yet anyway, why not try to
find one that gives a bit more 'oomph' while I'm at it? |
James
Feb 22
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| That's sound reasoning in my estimation. I would feel naked going without a
spare prop. I haven't had to use one yet, but it's nice to know it's there. |
Steve
Feb 22
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| I have a 17' Ranger with a 115 that I bought used. The prop I got with it
is a 4 blade stainless that had a 21 inch pitch. I was getting about 48mph
top speed with my normal load of fuel, gear and 2 anglers. At the time I
was only getting about 5100 rpm where my motor is rated to go to 5500.
After discussing the situation with guys in my fishing club and a couple of
prop guys, I had the prop modified to lessen the pitch by one inch. The
cost was about $100 but I also had some minor dings removed and the like.
The end result was a max rpm of 5500, top speed of about 52 and twice the
hole shot. I think the real issue is weather or not your getting the full
rpm at top speed, often this will tell you if the pitch is right for your
setup. I think the general rule is when you reduce pitch by an inch you get
back 2 to 3 hundred rpm. Good luck. Rich P |
Rich
Feb 22
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| Pooh...... |
Jerry
Feb 22
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| Four over "factory" specs is reasonable, eight is not possible with a stock
powerhead. I've setup and rigged about 30 or so 882's over the past two years, and some
guys liked the factory setup just fine, some didn't. The ones who didn't we
went to work on to find the optimum prop/motor height/accessory combo which
produced the best results. I'm by no means saying this is the best possible, because someone might come
up with something even better, it's just my own experience with that
particular boat/motor combo. I can also tell you what didn't work either, which can save some poor soul a
lot of time and money chasing down that elusive last mph. |
Pat
Feb 23
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| Pat, just so I'm clear on what you're saying, do you mean that 4mph over the
factory spec of 63-64 is possible? I really appreciate your sharing your experience in this. Right now, if I trim my current configuration for optimum speed, there's
significant torque on the steering wheel to the left, and the tach reads
4900-4950 (standard tach that came with the boat); and if I trim to
'steering neutral', the RPM's are at about 4800 and speed is at about 55.
This is with a tournament load, say 150-200 lbs gear and two anglers, in
typical lake conditions, not glass smooth at 64 degrees and whatnot that the
factory figures in their calcs. Was checking my manual today, and Merc recommends a full throttle RPM range
of 5250 - 5750, with optimum being in the 'upper half' of that range. I'm
not getting anything like that at full throttle, which could be two things
(as I understand it): either an imperfect balance of load, trim and prop, or
perhaps the tach is not reading correctly. From what I currently know (which admittedly isn't much) I would guess a
different prop pitch would help with boosting the full throttle RPM's into
the correct range as recommended by Merc. IIRC, my prop is the 23 tempest
you mentioned in a previous post. Another question: the original dealer told me there was something that
could be adjusted on the prop itself, having to do with the exhaust holes
which could change the amount of slip in a holeshot, and was a way of
tweeking the prop. Does that sound like BS or is it true? Thanks, |
James
Feb 23
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| Let's hope your tach is wrong, or you've got a sick engine.
A few guidlines on setting up your boat.
ALWAYS do your setups with a full load. Fill your gas, livewells,
equipment, two people. If you try to make adjustments on a light boat,
it'll fall on it's face with a load. There is a difference between cold and hot weather, be prepared for your
boat to fall off when it begins to get in the high 80's. If you can't drive it to it's potential, find somone who can and have them
teach you. Nothing is more frustrating than to have something you physically
can't use. This of course is if you didn't buy your boat from a dealer. If
you did, it is their responsibility to provide you with what you thought you
bought. Most tracker centers would rather eat dead flies than go to the
lake. (one of the biggest reasons I'm not there anymore) Some things are a simple fix, remember 90% of your boats performance is the
prop and motor height. Other issues, like your wheel torque are actually
fairly easy to cure, torque tab for $20 and ten minutes and you're fixed. |
Pat
Feb 23
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| Sorry,
Missed it.
The PVS plugs are what your dealer was mentioning. On an 882/Tempest, take
two of the plugs out, leave a small one in. That was the best setup I've
found. Those plugs adjust the amount of exhaust vent, so your prop can wind up
easier, which you need to get that butt heavy 882 up and running. |
Pat
Feb 23
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