Performance on 1996 15 Dauntless with 2008 90 Yamaha

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Author Topic:   Performance on 1996 15 Dauntless with 2008 90 Yamaha

badbronco88 posted 01-27-2008 09:55 PM ET (US)
Hey guys I own a 96' Dauntless 15 with a 90 HP Yamaha. I just wanted to post some performance numbers so that anyone with a Dauntless would have an idea on what their boat would do if they did this upgrade.
2 people on board, less than 5 knots wind:
RPMS
3500= 28 MPH
4000= 33 MPH
4200= 35 MPH
4500= 38 MPH
5000= 42 MPH
5500= 45.8 MPH
I used to have a 70 Yamaha on it and it did 35-36 mph WOT with one person. This has been the best upgrade I have ever done to the boat and would recommend it to anyone.
Thanks,
Ed
Casco Bay Outrage posted 01-27-2008 11:02 PM ET (US)
Ed -
Nice numbers.
Is the engine a 2 cycle or 4? I recall the Yamaha 2 cycle, 90 hp has a redline of 5500 but the 90 hp, 4 cycle is 6000. If you have a 4 cycle,you may be able to get a bit more out of her. Either way, that is FAST!
What prop are you running (for others to know)?
CBO
Perry posted 01-28-2008 02:52 AM ET (US)
It's got to be a 2 stroke Yamaha 90 because the 4 stroke Yamaha 90 would be way to heavy for the 15 Dauntless.
badbronco88 posted 01-28-2008 07:32 AM ET (US)
Hey guys the motor is a 2 stroke. As mentioned the general consensus was that the four stroke would have been too heavy. I am running a 13.25x 17 pitch SOLAS stainless steel propeller. It happens to be the same prop that was on it before. I never guessed it would ahve been the best fit but the different gear reductions between the 70 and the 90's lower unit made using the SOLAS possible.
Tohsgib posted 01-28-2008 11:31 AM ET (US)
That solas must really be baout a 20" pitch because my 90 Yamaha at 5500 would only do 41.5 with an OEM 13x17 SS prop.
badbronco88 posted 01-28-2008 11:57 AM ET (US)
No its definitely a 17. I did prop testing with 3 different turbo props and the SOLAS was the best performing. I have owned that prop for over 3 years. 45.8 is the best I have seen yet. It averages 42-43 top speed. I have the motor mounted on the highest setting it can possibly go.
Tohsgib posted 01-28-2008 01:35 PM ET (US)
Hey...Yamaha has not used engine year designations for a while so yours can not be a 2008 per say. Out of curiosity, what is the manufacturing date on it and did your dealer actually say it is a 2008 in writing? Jimh is gonna love this if they did.
badbronco88 posted 01-28-2008 02:26 PM ET (US)
Tosghib you are right about the year. It is in fact a 2007 model year. This was a typo in the original post. I bought it as a leftover 07. However I am under the understanding that there are 08's being produced.
Tohsgib posted 01-28-2008 02:45 PM ET (US)
Oh yes they are being produced but just like Mercury, they stopped using model year designations in 2006 and I think. So if the engine is made in 2005, they can still "theoretically call it a 2008 or equiv.

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Author	Topic: Performance on 1996 15 Dauntless with 2008 90 Yamaha
badbronco88	posted 01-27-2008 09:55 PM ET (US) Hey guys I own a 96' Dauntless 15 with a 90 HP Yamaha. I just wanted to post some performance numbers so that anyone with a Dauntless would have an idea on what their boat would do if they did this upgrade. 2 people on board, less than 5 knots wind: RPMS 3500= 28 MPH 4000= 33 MPH 4200= 35 MPH 4500= 38 MPH 5000= 42 MPH 5500= 45.8 MPH I used to have a 70 Yamaha on it and it did 35-36 mph WOT with one person. This has been the best upgrade I have ever done to the boat and would recommend it to anyone. Thanks, Ed
Casco Bay Outrage	posted 01-27-2008 11:02 PM ET (US) Ed - Nice numbers. Is the engine a 2 cycle or 4? I recall the Yamaha 2 cycle, 90 hp has a redline of 5500 but the 90 hp, 4 cycle is 6000. If you have a 4 cycle,you may be able to get a bit more out of her. Either way, that is FAST! What prop are you running (for others to know)? CBO
Perry	posted 01-28-2008 02:52 AM ET (US) It's got to be a 2 stroke Yamaha 90 because the 4 stroke Yamaha 90 would be way to heavy for the 15 Dauntless.
badbronco88	posted 01-28-2008 07:32 AM ET (US) Hey guys the motor is a 2 stroke. As mentioned the general consensus was that the four stroke would have been too heavy. I am running a 13.25x 17 pitch SOLAS stainless steel propeller. It happens to be the same prop that was on it before. I never guessed it would ahve been the best fit but the different gear reductions between the 70 and the 90's lower unit made using the SOLAS possible.
Tohsgib	posted 01-28-2008 11:31 AM ET (US) That solas must really be baout a 20" pitch because my 90 Yamaha at 5500 would only do 41.5 with an OEM 13x17 SS prop.
badbronco88	posted 01-28-2008 11:57 AM ET (US) No its definitely a 17. I did prop testing with 3 different turbo props and the SOLAS was the best performing. I have owned that prop for over 3 years. 45.8 is the best I have seen yet. It averages 42-43 top speed. I have the motor mounted on the highest setting it can possibly go.
Tohsgib	posted 01-28-2008 01:35 PM ET (US) Hey...Yamaha has not used engine year designations for a while so yours can not be a 2008 per say. Out of curiosity, what is the manufacturing date on it and did your dealer actually say it is a 2008 in writing? Jimh is gonna love this if they did.
badbronco88	posted 01-28-2008 02:26 PM ET (US) Tosghib you are right about the year. It is in fact a 2007 model year. This was a typo in the original post. I bought it as a leftover 07. However I am under the understanding that there are 08's being produced.
Tohsgib	posted 01-28-2008 02:45 PM ET (US) Oh yes they are being produced but just like Mercury, they stopped using model year designations in 2006 and I think. So if the engine is made in 2005, they can still "theoretically call it a 2008 or equiv.