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  #101  
Old 10-31-2018, 03:10 PM
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1redTA 1redTA is offline
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Boat: 1981 MasterCraft 351W slot
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running well is all that matters
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  #102  
Old 10-31-2018, 04:16 PM
CrashCourse316 CrashCourse316 is offline
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Originally Posted by 1redTA View Post
running well is all that matters
no such thing as unfix-able. : )
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  #103  
Old 10-31-2018, 08:16 PM
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kyfooter kyfooter is offline
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Cross off the prop as the culprit. A 13x13 prop was quite common for non powerslot transmission boats for many, many years and WOT for the direct drive Mastercrafts has almost always been between 4400-4800 rpms.

An under pitched prop would lead to higher RPMs, not lower. 14x18 prop was common for the powerslot transmission, but WOT was still within the range above. Newer powerslot boats went to a 14x20.

There are plenty of smart folks who will be able to offer suggestions, but until you run a computer check, I think you’re chasing and hoping to guess right, while throwing money at parts that may look worn, but work well.

There are worse problems to have with a boat. Starts easily and runs smooth, looks to be well cared for, enjoy it. Good find.
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  #104  
Old 11-05-2018, 06:40 PM
Bartnich Bartnich is offline
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Boat: 1995 Prostar 205 5.7L
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Originally Posted by mikeg205 View Post
Before you run and think you need to spend $$$ on a PC hook up.. do the basics and some basic maintenance. You should have a some codes stored in the ecu if tps out of range, map sensor out of range, or ect data out of range. I thonk you drive train needs some refurbishment before throwing too many dollars at it.

Sent from my SM-G955U using Tapatalk
So I was finally able to get the led lights to test for codes and it is clear. Just 12's, which I guess is good. So out of an abundance of caution, and because none of this is very expensive, I will be changing out the distributor cap, rotor, ignition module, plugs, and fuel filter prior to spring. I will also be checking the timing the first time I get back out on the water as well.

If that doesn't work fix it, the only thing left that I can think of is the fuel pump and/or injectors.
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  #105  
Old 06-05-2019, 03:47 PM
Bartnich Bartnich is offline
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Boat: 1995 Prostar 205 5.7L
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Got the boat out today for the first time since last October (we had snow until a couple weeks ago) and even after doing all the stuff mentioned in the post above, I still top out at about 38 mph. Runs strong and smooth but just can't get over 3800 rpm for some reason. Ultimately it is not a big deal since no one is barefooting behind it, but I like my stuff to run the best they can and it just bugs me. Haven't checked the timing yet, but I would guess there would be other symptoms of timing being off. Looks like injectors and fuel pump are the two last options to check.
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  #106  
Old 06-06-2019, 09:06 AM
88 PS190 88 PS190 is offline
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What was the altitude?
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  #107  
Old 06-06-2019, 09:51 AM
Bartnich Bartnich is offline
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Originally Posted by 88 PS190 View Post
What was the altitude?
The more research I do, the more I think that might be the primary issue. The lake is over 6k feet. Assuming 3% power loss for every 1k feet in altitude we get about 18-19% power loss. Sea level top speed should be around 44-45mph. While I'm sure the relationship is not completely linear, 82% of 44 mph is 36mph and I'm able to get 38 mph.

In 3 days I will be driving to Wisconsin for the summer and will be running it much closer to sea level. It will be interesting to see the difference.
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  #108  
Old 06-06-2019, 11:54 AM
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Ski-me Ski-me is offline
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Boat: Mastercraft, Prostar 205, 1994, LT1
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As a data point, I remember running mine when I first got it. Granted I have the LT1, but stock prop from factory, and 1:1 ratio.

Top speed at Pueblo Reservoir (elevation 4800')

Approx 42 MPH at 4700 RPM's
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  #109  
Old 06-06-2019, 11:56 AM
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Ski-me Ski-me is offline
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I think your RPM's need to go higher too....
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  #110  
Old 06-06-2019, 12:31 PM
Bartnich Bartnich is offline
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Quote:
Originally Posted by Ski-me View Post
I think your RPM's need to go higher too....
Yes, two differences that may make this an apples to oranges comparison. The LT1 is a fair sized HP difference and my prop is a 13x13 and yours is a 13x12 it looks like. That should give you higher RPM, right?
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