1999 31 fastech
 

can any tell me what speeds and props these boats run with twin 454 mags.?

72-74mph,probrably has 28 Bravos

I've got a 1997 FASTech 312
 

and have the 454mpi motors and 28 pitch Bravo 1 four-blades and see about 68-69mph.

26sonic,

76.9 GPS with 30's Lab Fin. Birdog was along fopr the ride.

Only thing done to the 2000 454 mag's is LARGE air filters Eddie's

The 312 has a great ride!!!!:cool:

I'm told that my new "97" 312 will run an honest GPS 80 mph with it's 454 EFI's.....of course there are the Prochargers helping out just a bit! I have to wait for delivery on April 19 to find out if it will run that fast or what in Oklahoma air.....the boat comes from Scottsdale Az. I think that is a higher altitude, but could be wrong. Here's hoping!!

Our 97 with Prochargers/454 Mag efi's will run an honest 85 here in Alabama.

1999 31 fastech
 

magic float what pro charge units are you using? what size props and gear ratios? is the 1997 a step hull.

Low boost M-1's. Went from 1.65's to 1.50's. Lab 31's I believe, will have to check,the 97 was the first step 312

We have a 97 312 on our lake with 454 mag mpi's & whipples. Dave had 1:65 gears, can't remember if he went with 1:5's or 1:36 gears. His boat runs a solid 84 plus in our very humid and hot summers. This will be his 3rd summer with the whipples.


Jan

Jan,

I have 1.36 gears.

Dave:D