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  #11  
Old 02-07-2018, 11:31 AM
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Originally Posted by mertens777 View Post
Running full ballast and added PWT bags, the 5.7 struggles a lot. I worked with Acme and we have the prop maxed out and she still struggles. I know why they offer a larger motor as an option in this boat. I’ll get a star with the bigger motor next time
OJ 15x13. Ive ridden a star with 5k pounds of ballast with the 5.7, and it’s doable. shouldn’t be having issues with just the PWT setup.
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  #12  
Old 02-07-2018, 11:37 AM
mertens777 mertens777 is offline
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OJ 15x13. Ive ridden a star with 5k pounds of ballast with the 5.7, and it’s doable. shouldn’t be having issues with just the PWT setup.
I did add a 400 in the bow walkway as well

Tried the 15x13, nope. Went with an acme, bettter but still sluggish without moving more people to the bow. Struggles to plane, hits 13-15mph, then struggles.

I have a OJ 15x13 for sale if anyone needs one
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  #13  
Old 02-07-2018, 11:43 AM
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I did add a 400 in the bow walkway as well

Tried the 15x13, nope. Went with an acme, bettter but still sluggish without moving more people to the bow. Struggles to plane, hits 13-15mph, then struggles.

I have a OJ 15x13 for sale if anyone needs one
How much?

The “horsepower” gain you may see with a tuner will go unnoticed. I would add more nose weight or drop the rear bags a touch.
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LONE STAR MASTERBASH 2018!!!!!!

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  #14  
Old 02-07-2018, 11:50 AM
mertens777 mertens777 is offline
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How much?

The “horsepower” gain you may see with a tuner will go unnoticed. I would add more nose weight or drop the rear bags a touch.
This is exactly what I’ve been doing. Thanks. I bought the 15x13 December of ‘16. Used it for about a month in the spring of ‘17 and went to the Acme. I was going to keep it as a backup but thinking about letting it go. I’ll think about the price.
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  #15  
Old 02-07-2018, 11:51 AM
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Did you try 15x12?
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LONE STAR MASTERBASH 2018!!!!!!

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  #16  
Old 02-07-2018, 11:58 AM
mertens777 mertens777 is offline
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Did you try 15x12?
No, worked with Eric and went with the recommendation for my needs. This included total weight and water activity needs
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  #17  
Old 02-07-2018, 12:04 PM
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No, worked with Eric and went with the recommendation for my needs. This included total weight and water activity needs
I would give that a shot too. Gonna be more aggressive than the 15x13.
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  #18  
Old 02-07-2018, 12:07 PM
Roman Roman is offline
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In my industry, we call these Toonerz because a lot of them are a complete joke.

Now back in those days, calibration was simple. Everything was table based and I'm sure there are only but a thousand or so variables in the entire software.

So the majority of these toonz do infact just offset an input signal, boost fuel pressure in a ghetto way and bam you have more power. It is important to note why though. These toonz are meant for vehicles. Vehicles are calibrated from the factory to meet emissions test cycles. Most of the time you are running left and right of stoic. When you hammer down and go wot, you go into power enrichment after a certain time (more fuel, more spark.....but more emissions). It is calibrated to not occur on cycle for emissions reasons. If you are familiar with HP tuners, or EFI live, you know the big drivability and power gains are made from altering when you enter power enrichment and what you do in power enrichment.

None of this applies for marine application of an engine from this era. You enter power enrichment right away (from a component protection standpoint, rich is safe and in the marine environment component protection is #1). Those engine were calibrated from component protection as the most important, then power, then visible emissions (no black smoke, no bad nox emissions that make your eyes water).

I would wager that there is really nothing to be had from one of those handheld things in an engine like this. You might be able to stab in a couple degrees of advance running 91, but its not going to be night and day. If you really need significantly more power, I would say go 383 stroker rebuild (with either a carb, or one of the aftermarket ECM’s is someone has developed something for marine), or repower with something like a 454.

You might need to do something more creative like completing your ballast fill once you are on plane too. Ive seen a setup or two online somewhere where they complete the fill using scuppers and some high power pumps. 1 or 2 minutes at speed completes the last couple hundred pounds.

When you say you have maxed it out, what prop are you running? With what pitch?
Don’t count on them to know what they are talking about. They screwed me over for my application, and then wouldn’t take the blame. Its rare and it happens, but you might be another one who was given ill advise. Everyone on here collectively has more knowledge on ski boat props then the guy who is picking up the phone on acmes end.

Have you also made sure your engine is healthy? Have you done a compression and leak down test? Verified fuel pressure?
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  #19  
Old 02-07-2018, 12:15 PM
mertens777 mertens777 is offline
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Thanks for the write up! Love your boat!!! Sold my '89 Maristar 240 for the Xstar. I'll do a compression test to ensure we are healthy. She runs like a dream though.

I will say we have another star on the lake with the same ballast setup, prop, and motor, it also has the same sluggish results. I'll get a hold of Acme or OJ again this spring and chat. Although, they both were apprehensive to go anymore aggressive than what they sold me. I'm not sure on the pitch, I'll look at it when I can.
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  #20  
Old 02-07-2018, 12:21 PM
mertens777 mertens777 is offline
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Roman -

Not that I'm into busting emission regulations, but don't marine engine manufacturers follow EPA emission standards on their engines as well? If so, there is room for tuning, correct? AGAIN, I'm not advocating potentially hurting the environment with emissions, just questioning your response that these motors are treated differently.

I see from you bio that you are well qualified to educate on this topic!! haha

Thanks

Last edited by mertens777; 02-07-2018 at 12:32 PM.
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