Suzuki Df115Bg on a 5.5m Rib setup advice.

[Kernow Explorer]

Afternoon all.

I have a gemini waverider 550.

Ive replaced my 2000 yamaha f115 that i was running a 19p propeller. It would get 39.9 knots and between 37 to 38.7 with 3 up.

Ive replaced with a new Suzuki and was expecting the same speeds. If not better. But with a 19p stainless I was hitting the rev limiter with 3 up at 35 knots. No trim adjustment.

Its been changed to a 21p stainless an only getting 37 knots one up. Still hitting the rev limiter if I trim out.

Engine is mounted 1 inch above the keel. I cant go higher as on the last bolt hole.

Anyone running the same engine on a Rib and whats your prop size and setup please.

[LittleSumpin]

The Suzuki DF115BG is geared to swing a bigger prop, then the Yamaha's ( or most other brands out there honestly ). I would think if your still hitting the REV limit on the OB, you still have room to increase pitch or diameter.

I will be taking possession of my new Highfield Sport 560 ( with the same engine in the water this spring ). The dealer is starting me out with the 19p. I will be following your thread to see how you make out ( and I will update all with my results when available ).

On a side note: How do you like the digital controls on the BG model?
Are you running it with the SMG4 gauge?

[Kernow Explorer]

Evening. Apoligies in the time taken to reply.

Wnet out today for 6 hrs, was nice to get out.

37 knots 3 up today, still hit the rev limiter with 2 clicks.

Not sure how aggressive the suzzuki props are.

4500rpm 26 knots
5000 rpm 30 knots.

I would hope for you once its run in. Yourself will be quicker as its a new hull etc.

The fly by wire is great, very smooth. I didn't go for the the push button start, due to issues when the batteries go dead etc.

But as its part of the engine package, I took it away with me. Incase I ever decide to install it.

But I like a physical key.

Whne my throttle was set up, I was hapoy wirh rhe friction, but now its probably a bit to easy to move, an you cna be caught out with a slight movement. So may look at it being adjusted.

Smg4 gauge is top notch. Everything you need is on it.

I went for a needle fuel gauge to run independently. Again personal choice.

It doesn't have built in GPS an I didn't have a nmea 2000 device for it to connect to. So purchased a gos puck of ebay.

Im sure on a new vkat you'll have a decent screen which can be linked in for tbe speed part of the smg 4.

[willk]

Originally Posted by LittleSumpin

I would think if your still hitting the REV limit on the OB, you still have room to increase pitch or diameter.

Personally I would regard the rev limiter as something nice to have but not activate, like airbags. IMO the OP should be aiming to hit the max recommended revs with a light load - one up with partial load would be my choice - balancing that against the occasional heavy load where the boat still has to perform reasonably without bogging down. My 'main' prop is a little underpitched for a light boat but I know to stay my hand.

Sounds like the OP's motor has a few more KPH left in it.

[LittleSumpin]

@ Kernow Explorer:

I have my SMG4 tied into N2K for both my Simrad chart plotter and Garmin AIS VHF ( both have GPS built in ). I had them install a dedicated fuel sender as well; and both the SMG4 and chart plotter can track usage. I wish they would incorporate the immobilizer feature, without the need to add the push to start. Like add in a 6 digit code to the SMG4 to lock out the engine.

As for props I will probably just use the 19p that came with the Suzuki as a spare and try to get a TBD 4 blade for grunt work like pulling people out back and a TBD 3 blade for better top end speed ( seems like this might be a SS 21p or similar based on your feedback ).

My understanding about adjusting the friction on the throttle, is that its just a set screw and very simple to adjust. I can't imagine ever going back to the tall sticky mechanical style throttle.