Need last few MPH !
#1
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Here goes, been reading OSO for years but never posted a thread, so bear with me.Boat is an Eliminator 250 eagle open bow, whippled 500efi (793 Hp- probably 700 to 730 hp @prop), Bravo xr with sportmaster shorty.
Can't get past 92mph, boat doesn't seem to care if it has 5 big guys and a full tank, or just me and 1/4 tank of fuel- always seems to hit a wall at about the 92mph mark. So far I've tried the following- 30p bravo 4 with 2 inch shorty= 92 mph, bumping off rev limiter @5700 like crazy. Added 2 inch spacer, same prop= 92 mph @5100 rpm (way better slip #s),
labbed 30p= 92mph @5500 rpm, 28p bravo 4= 89mph, bumping rev limiter again. Like to try a 1" spacer, but don't really want to spend the $ for possibly no gain.Is this about all I'm going to get from this set up, or am I missing something?
I know there were a few guys on this site with similar set ups claiming to run past the century mark. Where do I go from here, or should I just be happy with a 92mph bowrider
Can't get past 92mph, boat doesn't seem to care if it has 5 big guys and a full tank, or just me and 1/4 tank of fuel- always seems to hit a wall at about the 92mph mark. So far I've tried the following- 30p bravo 4 with 2 inch shorty= 92 mph, bumping off rev limiter @5700 like crazy. Added 2 inch spacer, same prop= 92 mph @5100 rpm (way better slip #s),
labbed 30p= 92mph @5500 rpm, 28p bravo 4= 89mph, bumping rev limiter again. Like to try a 1" spacer, but don't really want to spend the $ for possibly no gain.Is this about all I'm going to get from this set up, or am I missing something?
I know there were a few guys on this site with similar set ups claiming to run past the century mark. Where do I go from here, or should I just be happy with a 92mph bowrider
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#2
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Sounds much like our 1997 TopGun project a few years back after adding big power,changing X dimensions,props etc it was like hitting a brick wall.
Some imperfections on the bottom of our hull was holding us back.
It may be worth taking a look at we went from the mid 80s into the low 90s by eliminating a hook!
Good luck!
Some imperfections on the bottom of our hull was holding us back.
It may be worth taking a look at we went from the mid 80s into the low 90s by eliminating a hook!
Good luck!
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you might want to do the math... the drag profile at 92 mph is huge. to go from 92 mph to 97 mph is probably another 150 hp at a guess. you may very well be drag limited at this point.