Jbarr77 Posted July 11 Share Posted July 11 Any twin engine chap owners out there. Curious what your top speed is at WOT. we have a 317ssx and just trying to compare what other similar boats are doing photo below of the new beauty thanks! Quote Link to post Share on other sites
Phillbo Posted July 11 Share Posted July 11 RPM's are more important than speed. What are you getting at WOT? Quote Link to post Share on other sites
Mi3sons Posted July 11 Share Posted July 11 My pal hat a 285 SSI with twin volvo 350s that would do 57-58 Quote Link to post Share on other sites
Rambo Posted July 11 Share Posted July 11 The engine/drive brand/model info required to guesstimate the performance with a given hull. Rule of thumb - mid 50's on the water and mid 70's on the highway with good tow rig - Quote Link to post Share on other sites
Iggy Posted July 12 Share Posted July 12 7 hours ago, Phillbo said: RPM's are more important than speed. What are you getting at WOT? Yep! I have a twin engine Sig 290. Dry the boat comes in at 9500lbs. I am thinking your comes in around 7500lbs. Quote Link to post Share on other sites
rjbergen Posted July 12 Share Posted July 12 That’s a really open ended question. Our 2006 Sig 330 weighs 13,500 lbs dry, probably 15k loaded. We top out at 40MPH on the GPS with twin 320HP VP 5.7GXi engines and DP drives. Quote Link to post Share on other sites
Jbarr77 Posted July 12 Author Share Posted July 12 12 hours ago, Phillbo said: RPM's are more important than speed. What are you getting at WOT? That’s what is interesting. We just had the boat serviced and the rpms are around 5300. We have twin Volvo 350s. I thought the rpms were 5800 WOT. I am aware this is an open ended question. Simply curious what other 28 - 33 footers are at dry weight on ours is around 9,000 lbs. we have had it at 61.3 mph gps early on, seems like after the service we have been around 53-55 mph. I will say those twin 350s are awesome on this rig. It’s a blast to drive and the joystick has been a game changer having gone to a twin engine. Curious if any Chap lovers have any ideas of how to get the top speed out of the boat without jeopardizing the warranty of course Quote Link to post Share on other sites
Rambo Posted July 12 Share Posted July 12 Be careful what you wish for. The 60 MPH on water is just a few MPH and one confused wave away from flying. The two 350 should give you top speed in the high 50's, perhaps 60+ in perfect sea conditions with wind from behind. Keep in mind, it is a relatively light boat, especially at the bow. It will want to fly given the opportunity. Quote Link to post Share on other sites
cyclops2 Posted July 12 Share Posted July 12 Check all the spark plugs. A lead may not be fully seated on the spark plug. Quote Link to post Share on other sites
rjbergen Posted July 12 Share Posted July 12 9 hours ago, Jbarr77 said: That’s what is interesting. We just had the boat serviced and the rpms are around 5300. We have twin Volvo 350s. I thought the rpms were 5800 WOT. What model year? 5,800 sounds awfully high for a small block. I’d say 4,800 is more in line for a 350. Quote Link to post Share on other sites
Cleaver Posted July 12 Share Posted July 12 7 hours ago, rjbergen said: What model year? 5,800 sounds awfully high for a small block. I’d say 4,800 is more in line for a 350. The Volvo V8-350 is actually the new GM 5.3L Gen V direct injected gasoline engine which has a max RPM of 5,800 as opposed to the earlier Volvo 5.7Gi or 5.7GXi GM 5.7L Gen I engine with a max RPM of 5,000 to 5,200. Quote Link to post Share on other sites
Raft-up Posted July 14 Share Posted July 14 great looking boat, congrats! Quote Link to post Share on other sites
Jjlai724 Posted July 15 Share Posted July 15 Our 1999 2835 has two 350's with Merc outdrives and it runs in the high 50's. It's burning a lot of fuel at that speed and I keep in in the low 40's most of the time. Quote Link to post Share on other sites
cpg Posted July 15 Share Posted July 15 My 2014 31 Signature with twin 5.0MPI spinning Bravo3's , will hit 45MPH with four guys on board and a full tank of water and half a tank of gas in cooler weather. I normally cruise at 30MPH, which is 3,000 RPM and the boat loaded. This seems to be the sweat spot for her. At 30MPG I am burning 10.5 11.o gallons per hour each motor. Quote Link to post Share on other sites
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