twin69

I have a 2000 353 with 454 500hp heads cam and a 250 single carb blower set up. I dynod and got 610hp 5lb booste.
Low fuel two people low wafter tank. The boat also has neutral extension boxes. GPS BEST SPEED trimmed all the way was 83mph! I don't know how some of these people are getting these speeds with 470 500 hp?? Maybe I'm doing something wrong.

Mr Maine

I think powerboat tested the 353 at 90 with 600sci engines. Maybe you could see what the setup was on those boats.

axapowell

Well, first of all, what are the torque numbers? Secondly, what is your max RPM in the boat compared to the dyno?

Boat test at 90 with 600's is very generous....85-87 is the real number.

Dave

twin69

That's what I was thinking. Dream O meter
5500 608 hp
5500 597 torque
83 mph best I've seen in the ocean,low on fuel, 2 people
5pounds booste

VoodooRob

I'm on GPS garmin and handheld GPS, best so far was 84.7, have not got it there again. Always 83.5-83.8. My GPS speedo says 86, and there is no way the boat does that.

twin69

Voodoo what are you running for power?

VoodooRob

525s with ITS, XR Drives and 5 Blade Maximus 28P worked by BBlades. 280 K-Planes. Little over 320hrs with top ends done last season.

twin69

Nice set up!
I'm thinking shortys will help me out a bit. Has to be good for 2-5mph

VoodooRob

You have the first Gen hull? I do not have info about shorty performance on that specific hull. I know on my year the shorties do not add performance with my set-up, there was an OSO member that tried it and the boat did not run out well. There is an 06 353 with exact same running specs/hrs as mine in LEOPA but does not have ITS and the boat did not touch 80. There is something to having boxes on the 353 to get some speed out of it. Have you tried 380 K-Planes? That is next on my list if I can get the clearance.

Monaco20

I know for sure that these numbers ar the real thing, I do not know how many was onboard or how mouch fuel etc. That's not important when you go for a top speed run. Indy drives with 2" shorties 5 blades labben 34 pich propellens, reach 100 mph :-)
Boattest.com maxed out at 80,5 mph with 525 and bravo drives. When I wahced that test on YouTube it looks like they never got the boat "out of the water" ...

It is the 2012 353 test I am referring to

It seems that you need big power 650 + hp and boxes / shorties to get the 353 to real fast :-)

Marcus the owner of the mentioned 353,told me he is going to upgrade the engines with Whippels 900 hp ++
This year. Then it starts to get realy interesting ;-)