Go Back  Offshoreonly.com > Owners Forum > Scarab
1997 31 Thunder Seems like it should be a little faster >

1997 31 Thunder Seems like it should be a little faster

Notices

1997 31 Thunder Seems like it should be a little faster

Old 10-04-2014, 02:18 AM
  #11  
Registered
iTrader: (3)
 
Join Date: Jul 2012
Location: indianapolis
Posts: 1,248
Likes: 0
Received 2 Likes on 2 Posts
Default

My 96 Kevlar is probably quite a bit lighter than yours(due to the Kevlar and plain jane cuddy)
but I never run any tab with mine. I keep them as negative as they will go. How I decided on trim was watching gps speeds and the porpoise. My boat is fastest with no tab and it slightly bouncing. If you use any tab at all it's slows it down more than just trimming back down alittle. Mine with the 502 mags and m1 procharger would run over 80 with bravo 28's on it.
indysupra is offline  
Old 10-04-2014, 01:56 PM
  #12  
Registered
Platinum Member
iTrader: (1)
 
Join Date: Jul 2011
Location: Pittsburgh, PA
Posts: 237
Likes: 0
Received 2 Likes on 2 Posts
Default

Had a 91 scarab 31 with 502's at about 480hp at the crank. I ran both 27p mirage+ 3 blades then lab finished bravo 28p 4 blades. I saw 5200 rpm with the 3 blades and 5100 rpm with the labbed 4 blades and the top speed was about the same but all around the 4 blades handled way better. I would trim up until the bow would just start to bounce and found this point to return the best gps speeds. The boat ran 74 with 4 guys and half tank of gas and with just me and the wife with a quarter tank of gas and light on gear it would run 77 - 78. Boat was very weight sensitive.
dandercam1 is offline  
Old 10-07-2014, 08:00 PM
  #13  
Registered
 
Join Date: Aug 2009
Location: Green Bay, Wi
Posts: 42
Likes: 0
Received 0 Likes on 0 Posts
Default

My 96 31' thunder has stock 454mag efi's with cmi's and standoff boxes. Running 25 pitch mirage 3 blades I've seen 73gps. Runs right around 70 consistently.
vogepm is offline  
Old 10-08-2014, 06:35 AM
  #14  
Registered
Thread Starter
 
Join Date: Sep 2014
Location: monroe michigan
Posts: 215
Likes: 0
Received 0 Likes on 0 Posts
Default

Pulling the blowers for a fresh up.Think my K planes were slowing me down being dropped down.Need to get a few more hours of driving since I've actually only driven 3-4 hours.I see no reason why I shouldn't be very close to 80mph with the 525sc package with 230 hours.Big diff from the 18' 165hp searay lol.
MichiMike is offline  
Old 10-08-2014, 08:07 AM
  #15  
Registered
 
Join Date: Dec 2006
Location: Lake St. Clair
Posts: 339
Likes: 0
Received 10 Likes on 3 Posts
Default

Originally Posted by MichiMike
Pulling the blowers for a fresh up.Think my K planes were slowing me down being dropped down.Need to get a few more hours of driving since I've actually only driven 3-4 hours.I see no reason why I shouldn't be very close to 80mph with the 525sc package with 230 hours.Big diff from the 18' 165hp searay lol.
Nice Scarab! Where did you find it?
senzaspectre is offline  
Old 10-08-2014, 11:11 AM
  #16  
Registered
Thread Starter
 
Join Date: Sep 2014
Location: monroe michigan
Posts: 215
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by senzaspectre
Nice Scarab! Where did you find it?
West side Chicago suburbs 40k
MichiMike is offline  
Old 10-08-2014, 09:33 PM
  #17  
Registered
 
Join Date: Oct 2007
Location: Tulsa oklahoma
Posts: 608
Likes: 0
Received 11 Likes on 8 Posts
Default

Originally Posted by MichiMike
West side Chicago suburbs 40k
I've watched that youtube video a few times of boat, Beautiful boat man, congrats.
5050 is offline  

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


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.