If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Follow us on Facebook Follow us on Twitter
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1

    Merc 575 - Pwr increase options ?

    What can be done to substancially increase power on Merc 575's ????? anybody ?????


  2. #2
    Charter Member #232 Charter Member Audiofn's Avatar
    My Boats:
    1979 Formula 302, 99 Formula 353, 81 Donzi 18 2+3 with 454
    Join Date
    Oct 2000
    Carlisle, MA USA
    Add a intercooler and TURN UP THE BOOST
    Put your best foot forward!

  3. #3
    Charter Member #415 Charter Member
    My Boats:
    1968 Switzer Shooting Star,1967 Switzer Shooting Star,1963 Glasspar G-3
    Join Date
    Nov 2000
    Yeah,what Audiofin said. Superchillers and 5# boost pulleys put my friends 42 Fountain way up the scale. Downside was 2 destoyed XR drives in 3 weeks time.The horsepower boost is easy,keeping the drives together is the tough part.

  4. #4
    Forum Regulator VIP Member Sydwayz's Avatar
    My Boats:
    37' Active Thunder AVH; 17' Speedliner Cat OB
    Join Date
    May 2001
    Spine Tickler has Whipple Intercoolers added to his. did all the work, with very good results.

  5. #5
    Your broad knowledge ( not girls... ) base astounds me young Jedi.....

    Question Part #2 ) How about internally.... anything there ???


  6. #6
    Registered Whipple Charged's Avatar
    My Boats:
    Engine, speed, powerboats, Outerlimits SV43 with Whipple 1375SCI's
    Join Date
    Oct 2000
    Fresno, CA, 93722, USA
    You could take the blower and injection system off, install our 3.3L unit with intercooler and new inectors and make 750+.


  7. #7
    ...always the salesman

    Does the 575 SCEFI use throttle body injection, port injection, or both? Went for a rinde this summer on a 42 OL with triple 575's and I was very impressed. Ran pretty rich, but I guess its better to be safe than sorry.

    Looking forward to seeing you guys at SEMA next month. Got quite a few "upgrade" ideas I would like to run by you.


  8. #8
    Platinum Member Platinum Member
    My Boats:
    fuel injection, superchargers
    Join Date
    Jan 2001
    PA and MD
    The 575 is Throttle body injected.

    Dustin that would break my heart to take apart a $50,000 575SC.
    Better to sell the 575's complete and built a 540 with your system.

    Dustin will you ever be selling a complete 3.3l with computer, harness, fuel pump etc to go on my 509 or 540 engine. You seem to sell the supercharger stuff but not the electronics to make it all work. How about a complete 540 ready to go built by you and Pfaff. Just drop in or add your accessories and go.
    A built 540 with 8 pounds boost would make about 900HP!

  9. #9
    The easiest and cheapest thing you can do is add smaller blower pulleys. For just a couple hundred bucks we juiced up our 575's to 650 HP. We made the upgrade in the middle of the summer and experienced no problems. Another guy on our lake did the same and he's very pleased with the outcome as well. With the increased HP, it may be necessary to remap the ECM's to avoid hitting the rev limiter.

  10. #10
    I have gotten from AZ Speed &Marine two new ECU's which they claim will increase the boost by 1lb. and probably give me another 45hp per side. They will also allow the engine to rev. to 57-5800rpm. I have had them for several months but the motors have been running so well that I have been too chicken to try them. Anybody out there had any experience with these?

Page 1 of 2 12 LastLast

Similar Threads

  1. Merc 525 EFI Merc 575 SCI
    By dfealy in forum General Q & A
    Replies: 11
    Last Post: 09-21-2007, 04:07 AM
  2. Merc 575 ???
    By LEOPAJM in forum General Boating Discussion
    Replies: 20
    Last Post: 12-19-2006, 05:29 PM
  3. No Pwr When Cold Pwr Stroke 6.0 2005
    By paxtonsc in forum Trucks, Trailers and Transportation
    Replies: 8
    Last Post: 03-08-2006, 12:27 PM
  4. Merc. 575
    By wildthing357 in forum General Q & A
    Replies: 6
    Last Post: 09-27-2003, 12:12 PM
  5. Merc. 575 H.P ?????
    By seabeach in forum General Q & A
    Replies: 3
    Last Post: 09-22-2002, 05:54 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
All times are GMT -5. The time now is 01:10 PM.
Powered by vBulletin® Version 4.2.0
Copyright © 2016 vBulletin Solutions, Inc. All rights reserved.
Search Engine Optimization by vBSEO 3.6.1
Original Poster In Postbit provided by Original Poster In Postbit v1.0.0 (Free) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Copyright 2011 OffShoreOnly. All rights reserved.