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 GTR 40 XD Review 
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Location: Raceland, Louisiana
Post GTR 40 XD Review
Ran my new GTR 40 XD this weekend for the first time. I liked it a lot but wanted to do a review because you hear people exaggerating about it's performance.

First off, the motor is on an 18x48 crawfish skiff that is decked out. Two storages in the front, built in gas tank, hydroturf, etc. I also have 5 coats of gator base and 5 coats of gatorglide on the boat.

I ran it first stock out of lake long. The best speeds I was able to hold was 32 in shallow water and 33 in the intracoastal. That was at 4600rpms with the stock powertech prop.

I ran the boat today with the voodoo, k and n air filter, and a worked 12 pitch merc prop. I ran the boat with my dad, 3 ice chests, fishing poles, tackle boxes, a case of beer, and some other stuff, and ran 31 at 4600 rpms.

Final thoughts. For something I am not modding further, I am super happy with its performance and power. The noticeable difference between the 40 and 37 is not speed but torque. It feels completely different than a 37 in the torque area. Definitely a lot more.

Hope this helps anyone looking at getting one, and if anyone has one, let me know what prop you are running and what speeds you are getting with it, because I'm playing around with different ones currently and would like other opinions.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Sat May 12, 2018 1:36 pm
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Post Re: GTR 40 XD Review
Good information here!

I completely agree on the speed vs torque comparing the 37 and 40. My 40 is faster than my 37 was but I can really tell a difference in holeshot.

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Sat May 12, 2018 2:46 pm
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Location: Raceland, Louisiana
Post Re: GTR 40 XD Review
Absolutely bro. I think the main difference in speed for me is going to be adding more pitch to my merc prop. I had mine worked to a 12 pitch, but I can spin it 4700 at 31 mph. I think if I get it pitched to 13 or 13 1/2, I'll be able to attain the mid 30s easy. We will see, and I'll keep everybody updated on what prop I find works best on my rig so other people can not spend as much time as I have figuring out the exact right setup lol

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Sat May 12, 2018 3:28 pm
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Post Re: GTR 40 XD Review
I also bought the new 40. I have not been able to run it yet :cry: still waiting for my hull to get done being built. But I’m putting it on a 1653 havoc mst. What kind of speed do y’all assume i will be getting out of that?


Sun May 13, 2018 10:14 am
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Location: Raceland, Louisiana
Post Re: GTR 40 XD Review
Did testing after the exhaust and intake was put on the motor today with 4 different props. The results were as flollowing.
Gatortail 3 blade 10.5 pitch worked - 30.5mph at 4500 rpms
Gatortail 2 blade 11 pitch worked - 32mph at 4500-4600 rpms
Powertech 3 blade 11 pitch unworked (comes with the 40 GTR) - 32 at 4500-4600 rpms
Merc 3 blade 12 pitch worked - 35mph at 4600-4700 rpms

What I concluded from this is that if you want optimal performance from a 40 GTR, you need to have at least an 11 1/2 or 12 pitch, if you are running it stock or with just a few bolt ons.

All the speeds I acquired were by myself in the boat with no load. Holeshot in the 3 blades were garbage. The two blade surpassed them by miles in holeshot. Looking to get a worked big blade or hammer to try on the set up and see what it produces.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Wed May 16, 2018 5:07 pm
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Post Re: GTR 40 XD Review
I would think you will do over 30 bud

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Wed May 16, 2018 5:07 pm
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Post Re: GTR 40 XD Review
Sweet. Well as soon as havoc gets done with my boat i will post speeds


Thu May 17, 2018 12:30 pm
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Post Re: GTR 40 XD Review
Yeah bro, let me know how it does. I'm sure it will scoot

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Thu May 17, 2018 12:35 pm
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Post Re: GTR 40 XD Review
So if I’m looking to get more speed without mods yet , i will put a aftermarket muffler on it but that’s it ( what do you suggest for that as well) what prop would you suggest? Mainly will be in deep water , occasionally i will be in shallow water ,stumps and mud.


Thu May 17, 2018 12:35 pm
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Post Re: GTR 40 XD Review
There are a few exhausts out there man. The one is run is a voodoo that I have baffled. It's not excessively loud in the low rpms but is pretty pound at wot. It's a good exhaust, well made, and durable. I got mine ceracoated and love the look. It prevents the rest from developing as well. Another good exhaust is the stainless works. It's not as loud as the voodoo but has pretty much the same gains. Marshmellow makes a good exhaust as well and they sound good, but I've only seen them in passing. Other than that you have the macs (loud AF) but it is next to impossible to get in touch with the guy who makes them.

Other than that, get you a K&N high flow filter. It won't give you anymore speed but I find you will run a little cleaner and smoother at WOT.

Other than that, get your prop worked after you get some numbers stock at optimal rpms. Baggy in Houma does the best prop work in the industry IMO.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Thu May 17, 2018 12:45 pm
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Post Re: GTR 40 XD Review
Yeah those were my 2 options exhaust wise. Just didn’t want anything extremely loud. I will definitely check out the k&n! And how do i get in touch with baggy? I appreciate all the help man!


Thu May 17, 2018 12:50 pm
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Post Re: GTR 40 XD Review
985-868-0103 is baggys number bro. Tell him William chauvin from The police department referred you.

The part number for that filter is E-4665 too bro

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Thu May 17, 2018 1:41 pm
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Post Re: GTR 40 XD Review
10/4 thanks man!


Thu May 17, 2018 1:43 pm
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Post Re: GTR 40 XD Review
Also, buy that filter through an auto parts store because it's only like 45 bucks. If you order it through backwater, it's almost double the price.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Thu May 17, 2018 1:47 pm
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Post Re: GTR 40 XD Review
You can get the filter from Amazon for $40 with free shipping with prime. Most parts store will have to order from their warehouse anyway.

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Fri May 18, 2018 5:36 pm
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Post Re: GTR 40 XD Review
That's true, I had trouble finding it on amazon at the time, so I went to Oreillys, but I agree, if you can get it on amazon, that is always the easiest and cheapest.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Fri May 18, 2018 6:05 pm
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Post Re: GTR 40 XD Review
Great post. Looking to order late summer.
Stupid question. When you talk about torque with this motor,
What are you referring too?


Sun May 20, 2018 8:25 pm
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Post Re: GTR 40 XD Review
Torque is twisting force that causes rotation. Torque is what allows you to pull or push. The torque in relation to this topic is the force that allows you to chop through the vegetation, eat through the mud, or carry a large load in your boat. Torque is good and you want a motor with a lot of torque for the reasons explained above.

Now, tiller torque is not something positive, but it is something that really can't be avoided except by changing your prop or moving the load around he boat and displacing the weight differently in your rig. I find that tiller torque is a lot less in a 2 blade prop than in a 3 blade prop. Once you use both props on your boat you will see what I'm talking about bro.

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1971 Ouchita 1440 riveted with custom 23hp go devil LT
18x48 custom duck skiff with 40 hp GTR XD with some extras (voodoo, k&n intake, baggy worked merc prop, gatorglide G2)


Mon May 21, 2018 12:02 am
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