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-   -   Sunseeker Cobra 39 sluggish (https://www.offshoreonly.com/forums/general-boating-discussion/356858-sunseeker-cobra-39-sluggish.html)

Rookie 09-24-2018 07:43 PM


Originally Posted by compedgemarine (Post 4650938)
the first question is do you know what the ratio in the drives are? with that info we can figure out what the slip is and what it should run. also did you ever ride in the boat with the previous owner and really see it run those numbers? not to say it did not run that with this setup but it would not be the first a seller embellished the performance numbers.


Originally Posted by Boomer35 (Post 4650942)
Your add says “0 hours on drives”. Did the gears change in these new drives?

TRS are only 1.5:1 ratio

CobraGuy 09-24-2018 07:44 PM


CobraGuy 09-24-2018 07:48 PM


CobraGuy 09-24-2018 07:48 PM


Originally Posted by CobraGuy (Post 4650950)


will provide some pics tomorrow.

Found some on the phone

CobraGuy 09-24-2018 07:50 PM


Originally Posted by underpsi68 (Post 4650951)
Is the throttle all the way forward when your at 4000-4500rpm?
IMO if the gears changed you Would be over revving and most likely on a rev limiter.

No there is more to give but as the engines are new I’m a little conservative with maxing them

CobraGuy 09-24-2018 07:57 PM

http://www.youtube.com/watch?v=y1pB2_rRe0Y

CobraGuy 09-24-2018 07:58 PM


Originally Posted by CobraGuy (Post 4650959)
http://www.youtube.com/watch?v=y1pB2_rRe0Y

Most for fun :)

compedgemarine 09-24-2018 09:10 PM


Originally Posted by Rookie (Post 4650952)
TRS are only 1.5:1 ratio

yes but there is a TR drive that was 2:1. not sure if the gears interchange in the housing but I think the housings look the same outside and the decals could be wrong or the wrong gears put in if they interchange in the housings. just trying to look at every possibility.
at the speeds and rpm he his showing it is something like 60% slip with a 1.5:1 and 40% with a 2:1 +/-

northernoffshore 09-24-2018 09:33 PM

https://cimg6.ibsrv.net/gimg/www.off...b0c64c7322.jpg

CobraGuy 09-25-2018 12:06 PM

Anyone know if the props should we freespinning in neutral? Now 1 can be turned using 1 finger but the other one requires more force.


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