diveboy

Ok, here's the deal:

I own a 2001 32 Dominator that originally had 7.4 MAG's in it. I just replaced them with a pair of 500EFI's with 6 hours on them. I'm currently spinning Bravo I 30" props (not labbed yet).

With half a tank of fuel, 2 people on board total (including myself), running in approx. 68-72 degrees, in 2 foot chop, tabs all the way up, drives trimed all the way out, I'm only seeing a best of 82-83 MPH on a handheld Garmin 12 GPS at 5200 RPM (Gaffrig speedo reads 85-86MPH). If I try to trim the drives out any more, I bump the rev. limiter at around 5250 RPM.

I guess my questions are as follows: Shouldn't this boat be running faster, like 4-6 MPH faster with the current set up? I expected 87-89 MPH on GPS and am a little disappointed. The acceleration in the mid-range is fantastic but top end seems a llittle off. All the articles I've read on this boat (Hot Boat, Powerboat, etc.) show the boat running 88 MPH, however, they claim to have tested with 28" Bravo I props. I've read a number of posts on here by folks with the same set up getting much higher speeds on both GPS and the speedo. Also, for those of you running this combination, how are you getting 5400 RPM's out of your motor before hitting the limiter? Could my drives be out of alignment and scrubing speed?

Any thoughts on where I'm loosing speed would be appreciated.

Thanks in adavance!

Blueman

Diveboy is your drive trimed up or out as far as with the 454's. I know you should check your drive shaft alignment but i don't think it would scrub any speed off. I think it would be making a lot of noise to scrub any speed off. Are the props new? has any body tweaked them, I know a 30 B1 is about a 28.5 true pitch. You might be runing out of prop. How does it plain? tell us a little more