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-   Powerquest (https://www.offshoreonly.com/forums/powerquest-49/)
-   -   340 w/7.4 mags.....speed? (https://www.offshoreonly.com/forums/powerquest/127197-340-w-7-4-mags-speed.html)

speedreeder 04-10-2006 09:15 PM
340 w/7.4 mags.....speed?
 
Hey guys, can anyone tell me the speed of a 34 vyper with 7.4 efi mags? Thanks

littlejake 04-10-2006 09:57 PM
Re: 340 w/7.4 mags.....speed?
 
need mor info to help.

props?
gear ratio?
RPM's?

speedreeder 04-11-2006 01:22 AM
Re: 340 w/7.4 mags.....speed?
 
NO, I'm looking at buying one and I wanted someone that owns one now to tell me what they are running(speed wise with these motors)

hp500efi 04-11-2006 06:00 AM
Re: 340 w/7.4 mags.....speed?
 
what year? makes a big difference on year

speedreeder 04-11-2006 07:49 PM
Re: 340 w/7.4 mags.....speed?
 
looking at a '99 and a '2000

speedreeder 04-11-2006 08:02 PM
Re: 340 w/7.4 mags.....speed?
 
I was looking at some pics of '95 and up and they put the steps in and back cut the pad is the differences that I see. At least on '99 and newer had the cut back.

MK 04-11-2006 11:10 PM
Re: 340 w/7.4 mags.....speed?
 
The boat was originally built as a straight vee from 1996CY to 1998CY. In 1998CY it was stepped. Then in the first half of 2000CY the running surface was modified again. The 2001MY and newer boats should be the best running of the step hulls.

That boat with 454 Mag MPIs (385hp) should run solidly in mid 70's.

Marc

speedreeder 04-12-2006 02:01 AM
Re: 340 w/7.4 mags.....speed?
 
thanks, I do like the '99 a little better, but I guess that is a little slower hull. Thanks for the info

performancemary 04-12-2006 10:11 PM
Re: 340 w/7.4 mags.....speed?
 
SPEEDREEDER

I have been reading lots of posts on the Viper speed over the years and this is what I learned.
The 454's in any year are slow, the 502's aren't too bad espically in the 2002 and newer models. Possible to get upper 70's with the 502's in salt water with the 502's.
Best motor's reguardless of year are the 500's. Lots of spunk out of the hole, great midrange and top end will be deturmined by the match between the hull ( depends on year ) and the prop.
1999 had an improved hull over prior years and another improvement was made 2001 or 2002.
My two cents is what ever you get go wuth Blue Motors !!!!!!!s

wwwTOPDJcom 02-03-2021 09:26 AM
So a 496 mags should hit 70 on 2001 vyper?
 
Originally Posted by MK (Post 1695645)
The boat was originally built as a straight vee from 1996CY to 1998CY. In 1998CY it was stepped. Then in the first half of 2000CY the running surface was modified again. The 2001MY and newer boats should be the best running of the step hulls.

That boat with 454 Mag MPIs (385hp) should run solidly in mid 70's.

Marc
Im looking at a twin 496 mag 2001 vyper will it hit 70? It currently has 28 b4s


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