Like Tree0Likes

454 mag EFI, how to add 5 mph?

Reply
Old 10-17-2008, 01:32 PM
  #1
Registered
Thread Starter
 
Join Date: Sep 2007
Location: Volo, IL (the chain)
My Boats: 2002 Sonic Prowler
Posts: 144
Default 454 mag EFI, how to add 5 mph?

Hey Guy's n Gal's. I have a 232 baja w/a 454 mag EFI. its bone stock and the boat runs 66-67 GPS w/2 people, 1/2 tank and a 25 pitch mirage plus non-labbed prop @ 4800 RPM. thats on a good day, typically it runs 4600-4700 rpms. Either way, id like a solid 70 mph boat (a new boat is out of the question for this coming year). I have been reading about mods, and cant come to a conclusion of what is possible on the EFI motor. what can i do for an extra 5 mph? I was thinking flame arrestor, fuel press regulator, and an ECU flash. possibly some GLM manifolds, which i have read about, but havent been able to get any solid info on. Lastly i could lab the prop, but if anyone knows the chain, it wont last too long...Would all this get me 5 mph? Headers are out of the question as i cant justify spending 2k on this boat as id like a new(er) one in 2010. thanks for the input!
Chain Runner is offline  
Reply With Quote
Old 10-17-2008, 01:42 PM
  #2
Registered
 
Join Date: Jun 2001
Location: Michigan
My Boats: It's how well you go fast
Posts: 3,345
Default

Nitrous
audacity is offline  
Reply With Quote
Old 10-17-2008, 02:58 PM
  #3
Registered
 
Join Date: Sep 2008
Posts: 126
Default

Get a better tow rig
UP_ROKTOY is offline  
Reply With Quote
Old 10-17-2008, 03:46 PM
  #4
Registered
 
Join Date: Feb 2006
Location: Tallahassee, FL
My Boats: 1987 Donzi 22; 2008 Donzi 28 ZXO
Posts: 1,654
Default

Procharger. Then take the procharger off when you sell it and use it on the next boat or sell it separately and you will recoup most of the money.

Exhaust is the worst bang for the buck on a stock marine engine. a close 2nd is everything else you listed.

The only reason why I would buy exhaust on a stock or near stock engine is to reduce some weight and have a longer lasting product. other than that, dollar for dollar, exhaust is a crappy mod.
VetteLT193 is offline  
Reply With Quote
Old 10-17-2008, 04:00 PM
  #5
Registered
Trade Score: (1)
 
29KILROY's Avatar
 
Join Date: Mar 2004
Location: LOCKPORT, N.Y.
My Boats: -272, Killer 29 Outlaw, Boatless- For Now....
Posts: 689
Default

I did this to my old Boat!!!!

http://www.crockettmarineengines.com/products.html
29KILROY is offline  
Reply With Quote
Old 10-17-2008, 04:14 PM
  #6
VIP Member
VIP Member
 
lucky strike's Avatar
 
Join Date: Sep 2003
Location: Pompano Beach, Florida
My Boats: Using LS JR. TG
Posts: 8,468
Default

Ck the bottom of your boat for a hook.
__________________
www.mercedeshowroom.com
lucky strike is offline  
Reply With Quote
Old 10-17-2008, 10:46 PM
  #7
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,746
Default

You're not going to add 5 mph without major mods. You need to add about 75-100 hp to gain 5 mph. Figure $1000 per mph you want to gain.
Griff is offline  
Reply With Quote
Old 10-18-2008, 04:51 AM
  #8
Platinum Member
Platinum Member
Trade Score: (1)
 
articfriends's Avatar
 
Join Date: Jun 2004
Location: Frankenmuth
My Boats: EX 99 MPH 272 Baja owner, 1999 Scarab 33 AVS NOW
Posts: 6,072
Default

Buy a used m-1 procharger set-up for 1500$ off E-bay,reflash your ecu and spend the rest on props,sell the procharger when you get rid of the boat,Smitty

Last edited by articfriends; 10-18-2008 at 05:16 AM.
articfriends is offline  
Reply With Quote
Old 10-18-2008, 04:55 AM
  #9
Registered
 
Join Date: Oct 2006
Posts: 54
Default

Raylar
olmo40 is offline  
Reply With Quote
Old 10-18-2008, 05:15 AM
  #10
Platinum Member
Platinum Member
Trade Score: (1)
 
articfriends's Avatar
 
Join Date: Jun 2004
Location: Frankenmuth
My Boats: EX 99 MPH 272 Baja owner, 1999 Scarab 33 AVS NOW
Posts: 6,072
Default

Quote:
Originally Posted by olmo40 View Post
Raylar
Does Raylar sell a kit for the 454 mag mpi? I haven't heard of one,Smitty
articfriends is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
blown formula
General Q & A
31
06-10-2003 07:59 PM
Checkmate283
General Boating Discussion
2
08-30-2002 10:35 AM
Donzi22zx
General Q & A
0
08-14-2002 12:49 AM
checkmate981
Checkmate
1
05-07-2002 12:25 AM
Robert
General Q & A
2
02-12-2002 10:06 PM



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 05:58 PM.


Copyright 2011 OffShoreOnly. All rights reserved.