Like Tree0Likes

500efi to a 750hp motor-speed increase?

Reply
Old 08-24-2007, 07:07 PM
  #1
Registered
Thread Starter
 
Join Date: May 2004
Location: King George, VA
My Boats: 2001 Donzi 33zx
Posts: 160
Question 500efi to a 750hp motor-speed increase?

I'm thinking about swaping out my 500efi's for a motor with 750 hp & just wondering what everyone's opinion on what my speed increase would be? I have a 2001 Donzi 33zx. Thanks.
Brian C is offline  
Reply With Quote
Old 08-24-2007, 07:41 PM
  #2
Registered
 
Flashwave's Avatar
 
Join Date: Jan 2002
Location: NV
Posts: 420
Default

I'm guessing your boats weighs about 11500 pounds and runs about 75 MPH with 940 HP (Twin 500 EFI's) Does this sound about right? Move up to 1500 HP (twin 750s) you should be looking at 95 give or take.
Flashwave is offline  
Reply With Quote
Old 08-25-2007, 10:21 AM
  #3
Registered
Thread Starter
 
Join Date: May 2004
Location: King George, VA
My Boats: 2001 Donzi 33zx
Posts: 160
Default

That's right on the weight. On GPS I have seen 79.6 & can run 77 without an issue.
Brian C is offline  
Reply With Quote
Old 08-25-2007, 02:32 PM
  #4
Registered
 
Join Date: Jan 2004
Location: Tennessee
Posts: 4,452
Default

You should pick up about 15 mph. That is about a 225 hp increase, using 15 hp/ mph, gives you 15 mph increase. Not an exact formula, but gets you in the ballpark.
Young Performance is offline  
Reply With Quote
Old 08-25-2007, 05:32 PM
  #5
Rob
VIP Member
Trade Score: (6)
 
Strip Poker 388's Avatar
 
Join Date: Aug 2001
Location: Madison,Mississippi
My Boats: Hustler 388
Posts: 21,567
Default

Quote:
Originally Posted by Flashwave View Post
I'm guessing your boats weighs about 11500 pounds and runs about 75 MPH with 940 HP (Twin 500 EFI's) Does this sound about right? Move up to 1500 HP (twin 750s) you should be looking at 95 give or take.
I am guessing 92 mine picked up around 18-19 at 750hp
__________________
.

The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
Strip Poker 388 is offline  
Reply With Quote
Old 08-27-2007, 07:03 AM
  #6
Registered
 
Canada Jeff's Avatar
 
Join Date: Dec 2003
Location: Ottawa, Ontario,Canada baby!
My Boats: Sunsation and Apache
Posts: 1,566
Default

Well I'm just a single engine, but I Whippled my HP500EFi to at least 750hp and have seen 14 mph. I think there is more, but I'm fine with it for now. My boat weighs 4500 lbs dry.
Canada Jeff is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Donzi38ZXXX
General Q & A
5
02-06-2007 02:27 PM
florida gator
General Boating Discussion
4
01-12-2007 11:21 AM
Velocity
4
11-05-2006 07:09 PM
riverracerx
Nordic
18
03-25-2005 03:22 PM
Strip Poker 388
Hustler
38
12-16-2004 10:37 AM



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 08:30 AM.


Copyright 2011 OffShoreOnly. All rights reserved.