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  #1  
Old 02-07-2018, 08:16 AM
mertens777 mertens777 is offline
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Magnum Tuner for 5.7

Hey everyone, I have a 2005 Xstar with MCX 350. What are your thoughts on tuners for this engine.

http://www.magnumtuning.com/en/detai...ndmar/5-7l-efi

Thanks
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  #2  
Old 02-07-2018, 08:35 AM
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MC25 MC25 is online now
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Buy a new prop instead. Not worth the risk
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  #3  
Old 02-07-2018, 09:01 AM
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Keith2230 Keith2230 is offline
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Their sales pitch says it's saves fuel, which I assume means they're going to run the engine lean but then says it tells the ECU the intake air is much cooler causing it to run rich. Their marketing sounds like snake oil regardless of what their product actually does.

Is the stock EFI programming on these engines really bad enough that it's worth messing around? I'm guessing unlikely but there are others on the forum much more knowledgeable than I. Personally unless I modified the engine from stock I would expect there wouldn't be much to gain. I identify with Aric's concern especially if they try to run the engine lean. Saving fuel and getting more power is awesome until you end up with burnt valves.
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Old 02-07-2018, 10:05 AM
mertens777 mertens777 is offline
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You are correct, it actually will richen the mix, not lean it out. Having said that the fuel efficiency is a questionable claim

“ It tricks the ECU into thinking the intake air is much cooler, and then the ECU will send more fuel for a richer mix. The module allows you to fully remap the fuel trim and adjust the Air Fuel Ratio steadily.”

Last edited by mertens777; 02-07-2018 at 10:45 AM.
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  #5  
Old 02-07-2018, 11:02 AM
TStine TStine is offline
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People way smarter than any of us spent countless hours optimizing the engine for power, fuel economy, and longevity. you can't gain one without losing another.
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Old 02-07-2018, 11:13 AM
mertens777 mertens777 is offline
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Although I agree with you for the most part, there are many aftermarket parts that increase performance and will not harm motors. Iím not saying this product is one of them, Iím not sure. I would say that tuners In general are pretty popular for automobiles, motorcycles, etc.

Iím not too concerned about fuel efficiency, canít get much worse ;

Thank you for your input, I do appreciate it!
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Old 02-07-2018, 11:21 AM
mertens777 mertens777 is offline
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Quote:
Originally Posted by MC25 View Post
Buy a new prop instead. Not worth the risk
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. Iíll get a star with the bigger motor next time
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Old 02-07-2018, 11:26 AM
TStine TStine is offline
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I've got nothing against engine modifications, I've even had tunes put on my previous cars. But if you're not changing pistons/heads/cams, or working with a super/turbo charged engine, then a tune won't do much. If anything. Engine builders spend a lot of time tuning an engine for optimal fuel ratios under all kinds of loads and engine speeds. Having an engine "tricked" into runner richer does not=power.

I'm with Aric, put the money into a prop.
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  #9  
Old 02-07-2018, 11:29 AM
mertens777 mertens777 is offline
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Thanks! As stated above, I’m maxed out on prop. Appreciate your thoughts
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  #10  
Old 02-07-2018, 11:31 AM
TStine TStine is offline
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Sorry I didn't see that until after I posted. If that's the case, then go for it. If it doesn't work, return it! (or ***** and moan about it here)
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