Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  1989 Outrage 18 with 115-HP E-TEC

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   1989 Outrage 18 with 115-HP E-TEC
leadsled posted 05-11-2015 03:46 PM ET (US)   Profile for leadsled   Send Email to leadsled  
I just took my 1989 Outrage 18 out for the first time with the new E-TEC 115. I was going to buy a Tohatsu 115. I went with a gray E-TEC, which looks great on the boat. It also has a 8-HP Tohatsu kicker motor. The hull sits high above the transom drains, which means it's a dry hull. [The OUTRAGE 18 with 115-HP E-TEC] planes fairly level at 12 nautical miles per hour at 3000-RPM; does 16 nautical miles per hour at 3,500-RPM, and 20 nautical miles per hour at 4000-RPM.

I had to go in the river to find a place to do a full speed run. Running against a less than 1-MPH current [the E-TEC 115 engine] hit 5900-RPM. I was still trimming the engine up when I spotted the Harbor master, so I slowed down. [The boat] hit 31.5-nautical miles per hour 36-MPH. I suspect [the E-TEC 115] will hit [more than] 6000-RPM [if] trimmed out more than it was. Next time out if [the E-TEC 115-HP engine] goes over 6000-RPM I will get the next higher pitch. [The 115-HP E-TEC] has a 15-pitch aluminum propeller.

mkelly posted 05-11-2015 10:29 PM ET (US)     Profile for mkelly  Send Email to mkelly     
What are the full propeller specifications--manufacturer, model, pitch, and diameter? If it's an aluminum [propeller] presumably one of the standard E-TEC propellers. But there are a few. You have a fantastic boat, I think in step with the 15-foot Boston Whaler as far as the best small Boston Whaler hulls. Enjoy. If you blow up the E-TEC some day get it's bigger brother 150.
leadsled posted 05-13-2015 05:23 AM ET (US)     Profile for leadsled  Send Email to leadsled     
The prop is 15"X 15" and it's what the dealer installed. We can't put our boats at the marina till May 15 so this weekend I will get to run it again.
seahorse posted 05-13-2015 09:17 AM ET (US)     Profile for seahorse    

If your tachometer is accurate, then you should exchange the prop for an aluminum 17" pitch to get the revs down a bit.

Your engine has a 6000 rpm redline and performs well if propped near 5800 rpm.

You may want to try the 16" or 17" Viper prop if your dealer has them to let you try out. A 15" Rebel may help with the midrange economy and if you pull tubes, skis, or wakeboards.

Ask your dealer to check the model number of your new 115 with service bulletin 2015-02(S) for a possible software update on the engine. It only applies to specific model engines.

leadsled posted 05-13-2015 10:24 AM ET (US)     Profile for leadsled  Send Email to leadsled     
When I tested the boat it had nothing in it except for safety equipment and half tank of fuel and me. I think by trimming out the engine a little more I might get 6000 to 6100. They say 2" more pitch will lower the rpm 400. That would mean 5600 to 5700 rpm. With 2 more people,gear and a cooler of fish it might be straining the engine. If they had a 16" prop like the one I have it might be perfect. Going to another style prop would be a crapshoot.
This weekend I will try it again to see what it tops out at. As it is now I like how it performs at 3000 to 4000 rpm. It's nice to stay on plane at 12 knots at only 3000 rpm when it gets nasty.
I wish there was a chart to compare what different props will do to the rpm's. Thanks
Tom W Clark posted 05-13-2015 12:54 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
That boat should be good for 40 MPH with an E-TEC 115.

Ceteris paribus, increasing pitch by two inches will reduce the WOT engine speed by about 600 RPM because of the low 2.25:1 gear ratio and the relatively low pitch of the propeller.

However, if you gain those missing 4 MPH, a 17" pitch prop would be about right.

Be sure the motor is not mounted too low. It should be mounted three holes up (as high as it can go) ideally. Two holes up would be OK, but only one hole up is too low.

The 14-3/4" x 17" Viper, BRP part # 763914, would be BRP's best option. There may be slightly better propellers for slightly less money out there. I favor the 14-1/4" x 17" Stiletto Advantage 4.75, part # 800317, for this application.

The same hub kit you have now can be used with any of these propellers.

seahorse posted 05-13-2015 02:31 PM ET (US)     Profile for seahorse    

Tom W Clark wrote:

The same hub kit you have now can be used with any of these propellers


The Aluminum series of Evinrude props take a different hub and thrust washer than the V6 stainless steel propellers use.

Tom W Clark posted 05-13-2015 04:54 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
BRP does not yet offer the aluminum in TBX? Just conventional press-in rubber hub? Or is it a different TBX hub for their aluminum props?
leadsled posted 07-21-2015 08:35 AM ET (US)     Profile for leadsled  Send Email to leadsled     
I switched props from a 15" pitch Aluminum to a 17" Aluminum.
At 3000 rpm was getting 12 Knots now 14+ knots.
At 3500 rpm was getting 16 knots now 18+ knots.
At 4000 rpm was getting 20 knots now 22+ knots.
It seems to have a 2 knot increase across the board. It tops out at about 5500-5600 rpm at around 32 knots+. I have 80 hours on it now and it runs great.

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.