I have a 36hp prodrive on a 18x54 prodrive boat. I've got the heads done the other day and have a marshMellow exhaust. Also have high rev limiter and run 93 octane. I'm only running at 27 mph and was wondering if that was normal. Also I run my motor around 4200 to 4300 rpm's. just thought I should be getting a little more speed out of it!

What does your prop measure?

What speeds were you running before?

You should be at bout 29 empty.....I have the 17x54 and run 30 light at 4300rpm! Jeremiahw on here got the 18x54 cc and runs 29 empty. That's both deep water speeds! Same mods...sounds like your getting the rpm just not speed! So that tells me ur prop may be worn???

Brand new prop bought the same time as the heads. Three days ago

I also had my duck blind on it with 2 batteries an 12 gallons if gas. I guess that matters

Your in the normal speed range, most people just exagerate

Well I hear ppl say they run 31 to 34. They must be lowing I guess. I still haven't tried with current or shallow water yet

Lieing

Ok welll thanks for the answers ill keep playing till something happens........hopefully

Go devil 32 all day long with 12 gallons of gas dog and my hunting gear by my self on an 18 - 60 boat those pro drives are just fukn slow

I'm gonna strip everything out this weekend and try it

Run w/ the wind and current then check ur GPS when u get into the strongest gust against ur back in 18" of clean water. Post the BS as average deep water speeds so sum poor soul will spend his money on "one o' them bad ass mudmotors" then go to one of the local mud boat races (rides) where everyone's GPS is broke or dead and have a GRAND 'OL TIME! Dude ur right on the money.

Dont beleive the bullshit on this post,,,you are not right on the money!! Specialy for the RPM's you posted..

I will get jeremiahw to post his speeds,,,he got the same rig, same mods! What you posted were normal for stock speeds!

I know for sure, my heads and exhaust didnt give me much empty in deepwater, but it did give me a solid 1mph over stock! Loaded even better!

like i said,,i run 27 with 3 peeps and hunting gear! What gets me, is your Rpm's are good...thats about what i turn....

check it out, you may just have a lot of shit on ya boat and dont realize it!

Who did the head work?

I'm not gonna call him out for doing something wrong because I don't think that's the case. He has his own business and does this on a daily basis. So I'm not going to down him for something I'm not sure of. Just was asking if I'm at normal speed or at least close. Because before I done head work I was topped out at 25mph. So I did gain 2 mph

Man we went trough this this pass weekend with Gtr owner. Their will be places you gps better than others. These surface drives react different to wind , current and just about anything than a outboard. You may run down a bayou that is fast take a turn and loose 2 mph. Learn how to drive it and don't worry about 1 mph. My dual with the weight it is will drive you crazy with speeds but that just the nature of it. The speed thing on a surface drive is about as fucked up as the mpg thing is on a diesel truck.

Have you messed with the trim tab on the back of ur boat? that can slow u down a lot if it's bent to much.

Nope never messed with it. Guy at prodrive said don't mess with it if its not porpoising.

And I though you wanted your weight evenly distributed. To much weight in bag would make it drag right?

To much weight in the back

To much weight in the back

Gator Trax boats like the weight In the back of the boat. I am not sure why, but I had a 1750 as my last hull, and I picked up 1.5mph by moving the batteries to the rear from the bow. I would play around with your weight distribution, because everything else sounds about right.

Just want to say thanks to everyone for their comments. I moved shit around and bent trim tabs up a hair and now going 29.5 to 30.3. Very much appreciated!

I wouldnt steer ya wrong pal...

Good deal

Glad U got it figured out man, enjoy!