Like Tree0Likes

Lost 8 MPH??

Reply
Old 08-08-2010, 08:28 PM
  #11
Gold Member
Gold Member
 
Join Date: Jan 2004
Location: Houston, Texas
My Boats: 34 Fountain trip 300's
Posts: 491
Default

I had a ground wire come off the bottom of my distributor on a 1987 454 and caused similar issues. It was like the spark was scattered in stead of advancing properly. Just make sure you check ALL wires. With tach and such not working properly, just make sure all wires attached properly and engine grounds are good.
THLWL is offline  
Reply With Quote
Old 08-08-2010, 08:44 PM
  #12
Registered
Trade Score: (2)
 
Join Date: Mar 2002
Location: Miami Beach
My Boats: 2009 37 Spectre Diesel CC
Posts: 2,063
Default

The first thing you need to do is spend $100 on a GPS. You have no idea how fast you are going or if the speedo is even consistent. Once you have an accurate way to measure the speed you can see if you have a problem. An accurate working tach is also essential.
pstorti is offline  
Reply With Quote
Old 08-10-2010, 12:36 PM
  #13
Registered
Thread Starter
 
bimini run's Avatar
 
Join Date: Jan 2001
Location: Long Island, NY
My Boats: 1998 21' Baja Hammer
Posts: 175
Default

OK...weird. My son was annoying the crap outta me yesterday to go for a joy ride, so we went. And i let him go full throttle for the first time (thinking it would do no more than 60 because I was having trouble getting it past 62) and I tell him to hit it, and I look over at the speedo and he's flying past 64...got it up to 69. Could've gone faster too if we had more water (water was too choppy). The only thing he did differently was he didn't trim up as much as i did. When I'm going full, I trim up as much as the handle lets me, which is about halfway on the gauge. He only trims up like 1/3 (on the gauge). And after it was at like 66, i told him to bump it up a bit and it got up to 69. Now when i had the 454, this is what i was doing to. Am I driving wrong? lol. Guess I need to play with the trim more.
bimini run is offline  
Reply With Quote
Old 08-10-2010, 12:41 PM
  #14
Registered
 
Join Date: Oct 2005
Location: Lake Norman, NC
My Boats: 32' Skater
Posts: 389
Default

Overtrimming probably lead to the mph loss.
apppedigree is offline  
Reply With Quote
Old 08-10-2010, 06:59 PM
  #15
Registered
 
Join Date: Dec 2009
Location: Grain Valley,Mo
My Boats: 2000 firehawk 2600
Posts: 867
Default

Bimini dont tell your son he drove better you'll never get in the driver seat again, well at least you figured it out
firehawkcat is offline  
Reply With Quote
Old 08-10-2010, 07:10 PM
  #16
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default

Chop vs flat water makes a big difference with a straight vee as well.
blue thunder is offline  
Reply With Quote
Old 08-10-2010, 07:45 PM
  #17
No Comment
VIP Member
 
packinair's Avatar
 
Join Date: Jan 2002
Location: This post copyright, Packinair Inc. All rights reserved.
Posts: 1,637
Default

your speed wax wore off.. re-apply and you should be good
__________________
packinair is offline  
Reply With Quote
Old 08-11-2010, 12:05 AM
  #18
Registered
VIP Member
 
Join Date: Oct 2004
Location: Long Island, NY
My Boats: 1998 Scarab
Posts: 870
Default

How about fresh fuel ? I just went throught this problem. It turns out the garbage fuel we get has about a 30 day shelf life. That's from the depot to your engine. I slip my boat, and I go in the water pretty early ( first week of April ). I used my boat on April 15th and only 2 more times until the end of June. I lost 10 MPH. I figured major problems, but I still had my RPM's. Most boats in my marina have had to do a short haul, quick cleaning, drop her back in. Due to the extremely warm water this year, we're getting growth in May and June that we don't normally get until late August. So I went for the short haul, and to my disappointment, the bottom was pretty clean. I was hoping for an easy solution for my loss of speed. As we were lowering her back in the water, I started BS-ing with the kid in the marina. He told me about the poor gas situation and got me thinking. My gas was now almost 4 months old. I went right to the gas dock, cruised around a little, and all problems solved. Speed right back to normal. Hopefully your problem is as easy to fix as mine. Good luck
frankenstein is offline  
Reply With Quote
Old 08-11-2010, 04:37 PM
  #19
Registered
 
Join Date: Jul 2001
Location: oshawa ontario
My Boats: 31 Scarab Thunder
Posts: 4,699
Default

Quote:
Originally Posted by blue thunder View Post
Chop vs flat water makes a big difference with a straight vee as well.
X2
pullmytrigger is offline  
Reply With Quote
Old 08-12-2010, 08:22 AM
  #20
GLH
Platinum Member
Platinum Member
 
GLH's Avatar
 
Join Date: Dec 2002
Location: Burlington, VT
My Boats: Azimut
Posts: 15,267
Default

Water condition and more weight that might shift the center of gravity on a stepped boat might be your issue.
GLH is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 06:06 PM.


Copyright 2011 OffShoreOnly. All rights reserved.