Like Tree0Likes

What is top speed for Formula 312 w/454 mags?

Reply
Old 07-29-2004, 06:48 PM
  #1
PlayinPossum
Guest
 
Posts: n/a
Default What is top speed for Formula 312 w/454 mags?

I have a 1998 312 Formula with T-454 mags. I had 28 pitch props and the max rpms was around 4300+/-. I have changed the props to 26 pitch and can only run around 4500+/- rpms. The speeds was about the same on both. I have purchased this boat about 5 weeks ago and the dealer told me at the time of purchase it should run about 5000 +/- rpms but now he has no ideals. The engines run strong up to this point. Is this normal? Can someone give me some ideals to try. Thanks.
 
Reply With Quote
Old 07-29-2004, 07:00 PM
  #2
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default Re: What is top speed for Formula 312 w/454 mags?

I would hunt down some 25p mirage non plus props. Should spin you to 5000rpm base on the numbers you listed with the 26p and 28p. I'd guess a speed of 63-65mph. What were you getting for mph with the 4 bladers (assuming they were)?

BT
blue thunder is offline  
Reply With Quote
Old 07-30-2004, 10:16 AM
  #3
Jan
Member "69" Charter #70
Charter Member
 
Jan's Avatar
 
Join Date: Oct 2000
Location: Lake Murray, South Carolina
My Boats: NONE
Posts: 465
Default Re: What is top speed for Formula 312 w/454 mags?

Sounds like he has 1:36 gears in the drive??? Maybe the boat had big motors at one time and the bravo gear ratios were changed.

Friend has a 312 with 454 mag efi's. Ran in the low 70's new, runs in the mid 80's with wipples. Not sure about what props he is running.


Jan
Jan is offline  
Reply With Quote
Old 07-30-2004, 12:23 PM
  #4
PlayinPossum
Guest
 
Posts: n/a
Default Re: What is top speed for Formula 312 w/454 mags?

Thanks for the information from all of ya'll. The dealer has told me after the fact that the previous owner had new heavy duty drives put on the boat and the ratio was change from 1:6 to 1:5. The problem is I had purchased the boat from a dealer in CA and I live in north TX where the boat is now. Is there a quick check for the ratio or will I just have to go into the drives to find out? Thanks to all.
 
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
RHICKOFF
Baja
15
08-28-2008 10:47 AM
derek111111
Formula
0
08-01-2008 11:58 AM
Monaco20
Formula
42
04-14-2008 04:07 PM
bn
Formula
8
05-10-2004 09:05 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 10:59 PM.


Copyright 2011 OffShoreOnly. All rights reserved.