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-   -   The 300 xperiment (https://www.offshoreonly.com/forums/skater/315912-300-xperiment.html)

davidmercury 01-18-2015 03:59 PM

Engines sound healthy Ron! Looking forward to hearing about top end comparison

Onetime 01-18-2015 05:00 PM

I'm really amazed that it's only .3 mpg difference from the xs engines. Everything I've done with the xs engine is drastically better fuel consumption, especially in that rpm range.

Flightplan 01-18-2015 08:00 PM

How did your "seat of the pants" dyno rate the horsepower? Could you feel it?

Double Rigged 01-18-2015 08:29 PM


Originally Posted by Flightplan (Post 4252008)
How did your "seat of the pants" dyno rate the horsepower? Could you feel it?

It is hard to tell just yet. Felt really good. with the props I was running the best the xs's can do is turn them to around 6400. The cool thing is t x's will turn them 7000. My buddies 30' Skater ran 112mph with 30's at about 6900 or so.
FP you mentioned a 3rd motor for the 32 if I decide to sell them. I have one better. Sell me both of yours and buy 2 new 400 racing 4 strokes!!!!!
Your boat would be faster......

Flightplan 01-18-2015 08:43 PM

I just looked, Mercury Racing doesn't have a 400. It's just a myth...:silenced:

Double Rigged 01-19-2015 06:26 AM

It is coming. You will see it Miami. Have a lot of good intel down here. Just cannot reveal the sources....

KEVLARKAT32 01-19-2015 08:28 AM


Originally Posted by Onetime (Post 4251911)
I'm really amazed that it's only .3 mpg difference from the xs engines. Everything I've done with the xs engine is drastically better fuel consumption, especially in that rpm range.

In fact the exact opposite, Opti are far better MPG down low because its DFI . As a conventional piston port engine increases the mpg difference decreases . With fuel prices today , its the good old days again .

Onetime 01-19-2015 09:23 AM


Originally Posted by KEVLARKAT32 (Post 4252166)
In fact the exact opposite, Opti are far better MPG down low because its DFI . As a conventional piston port engine increases the mpg difference decreases . With fuel prices today , its the good old days again .

That's exactly my point! The XS engines are Opti's. Seeing only .3 mpg difference at that rpm range is very surprising to me. The Opti's burn way less fuel in that rpm range. Or am I missing something in the way I read the post or am I saying it wrong?

mlb75 01-19-2015 09:43 AM

Sorry didn't follow what you're saying KK32, other than what you said about fuel prices, I just hope they're still here when I get to start boating again. It's appeared to me that the biggest difference in MPG between the X's and XS's was in the mid range but once you open them up they both burn if I remember correctly like 34 for the XS and 38 GPH for the X's which isn't that far off. Do those numbers sound right to others? If so maybe the X's really are the preferable motor if they make more power at a reasonable increase in fuel burn. Unless you've got three like some of us :( LOL

DR, I'm also closely following you on this one, I went from twin xs on teh last boat to trip X's on the 32 Skater, I didn't get much time on the Skater last year before the season ended but am loking forward to this coming season. I'm in teh process of going through all three motors and redoing the dash and a bunch of the rigging, anything I should look out for? Also curious is you had any issues with getting the X's working with the vessel views? I ask becasue I'm planning an all glass dash but using a gateway to two Garmin units, at least that's the plan for now...

KEVLARKAT32 01-19-2015 09:57 AM

Idle , 300xs sips fuel like a jew , under 4 k xs is king however the closer you get to WOT yes the DFI ( opti ) will get better MPG than efi but the difference to us go fast guys not big deal .Don't get me wrong I would grab pair 300 xs in a second however I don't have the money and I buy 225-250 cheap and turn them into 300x with exhaust chest mods , intake , ecu .


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