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What performance should I be getting out of a 35hp GTR gatoetail on an 1854 hull?

Posted on 9/30/18 at 3:14 pm
Posted by poochie
Houma, la
Member since Apr 2007
6211 posts
Posted on 9/30/18 at 3:14 pm
I have this combo with a center console. Maybe 150lbs of “gear” between batteries, trolling motor, etc.
With just me I can get ~26mph max
Me and one adult: ~22 max
Add another adult and I’m lucky if I can get on plane. ~14 mph

It should be bettter than this, right?
Posted by Timmayy
Houston
Member since Mar 2016
1592 posts
Posted on 9/30/18 at 3:22 pm to
Yeah that’s about right haha. Especially if it’s older the heads might could use a tuneup. Get a carb, head and bps exhaust and your load carrying capability will be way better.
Posted by sparkinator
Lake Claiborne
Member since Dec 2007
4460 posts
Posted on 9/30/18 at 3:35 pm to
Trying to tune mine was a pain in the butt. I had a new carb and a aftermarket stainless exhaust and it ran ok with just me. A little more weight and it was a dog.

Trying to tune that carb/choke rigged up on a governor was a PITA.
Posted by poochie
Houma, la
Member since Apr 2007
6211 posts
Posted on 9/30/18 at 3:45 pm to
Well shite
Posted by Motorboat
At the camp
Member since Oct 2007
22678 posts
Posted on 9/30/18 at 5:12 pm to
Yeah you’re getting what is average with these boats. The more weight, the slower it goes.
Posted by Timmayy
Houston
Member since Mar 2016
1592 posts
Posted on 9/30/18 at 5:14 pm to
Yeah that’s why I let boat dr set mine up and it runs like a champ
Posted by REB BEER
Laffy Yet
Member since Dec 2010
16194 posts
Posted on 9/30/18 at 5:36 pm to
That’s a lot of boat for a 35hp lawn mower engine. Like Timmmmmay said, if you want to carry 3 people in a boat that size, you’ll need a little work. But also try to rebalance your load...get the guys to move around and see if you can get another mph or 2.
Posted by bootlegger
Ponchatoula
Member since Dec 2012
5335 posts
Posted on 9/30/18 at 6:04 pm to
I have the 37xd on my 18x54. I'm at around 24 with 3 people and hunting gear.

Posted by Dmaxxx37
Member since Apr 2017
125 posts
Posted on 9/30/18 at 6:08 pm to
I have a new custom build 1848 with a L3 40 GTR XD from Delta Performance and with 3 guys, dog, 13g gas, 2 optima blue tops, wetsounds 10, guns, decoys, 75q yeti, 30q hopper, blind bags, dog stand, waders and other random shite and averaged 35.5-36.5 with a worked big blade.. Load placement and prop also play a big part-

This post was edited on 9/30/18 at 6:31 pm
Posted by bootlegger
Ponchatoula
Member since Dec 2012
5335 posts
Posted on 9/30/18 at 6:43 pm to
Damn son. That's quick. Making me wanna re-check my speed.
Posted by Dmaxxx37
Member since Apr 2017
125 posts
Posted on 9/30/18 at 6:50 pm to
Have dyno sheets from Delta on my motor that have it around 62hp.. Getting a worked big blade made a huge difference in jumping up on plane/pushing a load. Only have about 4 hours on it so, still have some tweaking to do but overall super impressed with the power these new motors have.
Posted by GeauxFast
Gonzales, LA.
Member since Dec 2007
97 posts
Posted on 9/30/18 at 7:30 pm to
I had the same problem. Clean the carb. Boat ran perfect just no top end. Seemed like boat was plowing. Cleaned carb and back to 26/27. 1854 center console
Posted by magicman534
The dirty dell
Member since May 2011
1571 posts
Posted on 9/30/18 at 8:02 pm to
I have the exact same setup. Alone I could get 26-27mph with gas tank, batteries, boat blind and decoys. If I put 3 250# plus dudes in there with that gear I would barely get on plane. Getting thinner friends was an option, but I decided to take the boat to the boat dr. I had a mikuni carb put on, iron mountain heads, and a bps q exhaust. Ran me around 2k. The difference is unbelievable. Gained maybe 2-3mph top end while alone, but loaded with 3 big dudes, boat blind, decoys, gas, 2 batteries, guns and buckets I can get out the hole quicker and run 25-27mph depending on the wind.
Posted by Success
Member since Sep 2015
1724 posts
Posted on 9/30/18 at 8:23 pm to
You must be an anesthesiologist with that kinda cash
Posted by KemoSabe65
70605
Member since Mar 2018
5132 posts
Posted on 9/30/18 at 8:26 pm to
Fellas must have some long runs for that spendy speed.
Posted by shawnlsu
Member since Nov 2011
23682 posts
Posted on 9/30/18 at 8:33 pm to
200 decibles
Posted by Redfish2010
Member since Jul 2007
15169 posts
Posted on 9/30/18 at 8:56 pm to
How’s your prop? You running 2 or 3 blade? When i got mine worked it helped me get up and added a few mph
Posted by magicman534
The dirty dell
Member since May 2011
1571 posts
Posted on 10/1/18 at 7:55 am to
quote:

You must be an anesthesiologist with that kinda cash


I wish LOL.

I’m running a two blade prop now. I will probably look into a three blade soon. The biggest difference I noticed was the load carrying capability which was impressive
Posted by snapper26
Member since Nov 2015
521 posts
Posted on 10/1/18 at 8:18 am to
The 35hp stock was only 31hp to the prop.

Now the 40hp is almost 40hp at the prop.

To me its worth selling the motor you have and upgrading to the 37 or 40 vs spending 2k on an old one.

Also the boats make a big difference. If yours is heavy then its starting out loaded down before people and gear.


Posted by poochie
Houma, la
Member since Apr 2007
6211 posts
Posted on 10/1/18 at 9:46 am to
My setup is a gatortail extreme 1854. Engine is stock 2012 with a 2 blade prop. I guess I didn’t realize there would be that much of a drop off in performance with more than 2 people.

The main use is fishing saltwater marshes and some occasional perch jerking so outboard can do what I want to do 95+% of the time so I may deal with the GTR performance for a few years then swap out to an outboad. I really like the layout and fishability of the hull.
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