Like Tree0Likes

Speed with new blower

Reply
Old 09-24-2002, 08:16 PM
  #1
Registered
Thread Starter
 
OkieTunnel's Avatar
 
Join Date: Mar 2001
Location: Oklahoma City, OK
My Boats: 35 Motion "Bring It" is "For Sale", 31 Warlock
Posts: 872
Default Speed with new blower

I posted pics a week or so ago. Boat is a 24 Lightening tunnel built by Wyatts Performance Boats. It ran 77 on GPS with two aboard and about half fuel at around 4700 RPM (I never look real close). Engine was a stock 454 Mag spinning a 28 pitch bravo 1 four blade. Now it has the same 454 Mag with a [email protected] 250 EFI blower. I am starting with a 30 pitch Bravo 1 four blade. I also added external steering and some other stuff. I will also try a 32 pitch Bravo if this wheel isn't big enough. I want to keep the RPM's down if possible. How fast will it go? [email protected] said 8 to 15 mph gain. It seems like I saw someone on this board a couple of years ago who picked up 17mph on a 22 foot tunnel. Mine is actually barely less than 23 in fiberglass. I think it is going to see 90 at least. What do you think?
OkieTunnel is offline  
Reply With Quote
Old 09-24-2002, 08:24 PM
  #2
VIP Member
Trade Score: (1)
 
Smitty's Avatar
 
Join Date: Apr 2001
Location: Hawthorn Woods IL
My Boats: 2000 Baja 36 Outlaw
Posts: 4,186
Default

You should be spinning that motor up to 5000 rpm. That is where the H.P. peak is. I picked up 14 mph on a heavy V hull at 6 psi boost so I would think 90 is not going to be a problem.

Do you have a GPS unit for speed? If not I would get one and have your passenger call out the speed numbers that way you can drive and trim up or down to get max speed.
Smitty is offline  
Reply With Quote
Old 09-24-2002, 08:37 PM
  #3
Registered
Thread Starter
 
OkieTunnel's Avatar
 
Join Date: Mar 2001
Location: Oklahoma City, OK
My Boats: 35 Motion "Bring It" is "For Sale", 31 Warlock
Posts: 872
Default

I have a hand held GPS. Also, at 77 my liquid filled Gaffrig and the GPS read the same (actually the speedo is a few tenths less). I have a tattletale on the speedo and the GPS will recall the highest MPH reached. On this hull I need a lot of positive trim to reach 77 but have been told into the eighties and nineties I will not need near as much positive trim. I just haven't had enough HP to air it out right. By the way, my boat is one of two with a stock 454. All the others built have had blowers, big stroker motors, or twin outboards.
OkieTunnel is offline  
Reply With Quote
Old 09-24-2002, 08:46 PM
  #4
Registered
Thread Starter
 
OkieTunnel's Avatar
 
Join Date: Mar 2001
Location: Oklahoma City, OK
My Boats: 35 Motion "Bring It" is "For Sale", 31 Warlock
Posts: 872
Default

Heres a pic:
Attached Thumbnails
Speed with new blower-boat-2.jpg  
OkieTunnel is offline  
Reply With Quote
Old 09-24-2002, 08:46 PM
  #5
Registered
Thread Starter
 
OkieTunnel's Avatar
 
Join Date: Mar 2001
Location: Oklahoma City, OK
My Boats: 35 Motion "Bring It" is "For Sale", 31 Warlock
Posts: 872
Default

And another:
Attached Thumbnails
Speed with new blower-blower-3.jpg  
OkieTunnel is offline  
Reply With Quote
Old 09-24-2002, 08:52 PM
  #6
VIP Member
Trade Score: (1)
 
Smitty's Avatar
 
Join Date: Apr 2001
Location: Hawthorn Woods IL
My Boats: 2000 Baja 36 Outlaw
Posts: 4,186
Default

That's an awesome looking setup. Get that boat in the water and let us know what it runs!! Sounds like you have the speedo thing well under control. Just make sure to spin that motor up!! Mine is a 454 Magnum and I run it up to 5000 alot!!
Smitty is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
PicChic
General Boating Discussion
10
11-21-2007 11:46 AM
jryan26
General Q & A
11
12-06-2005 10:03 AM
TGOR
General Racing Discussion
3
03-29-2005 09:07 PM
engreps
General Q & A
6
04-02-2003 11:07 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 10:26 AM.


Copyright 2011 OffShoreOnly. All rights reserved.