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are you running a AWIC?

Quote:

Originally Posted by bobl (Post 4625708)

Let me throw out a couple of thoughts. You are reading the map sensor which reads the absolute KPA the intake is seeing. If the barometer changes, that number changes. You go up to high elevation and the kpa will read a lot lower and your data log would show a lot lower. However if you were looking at a boost gauge it would still read 10 psi boost, which is the amount of pressure above atmospheric you have. So, your data log will read something different every time, but it shouldn't be nearly as much as you are seeing. I also believe that with hotter, less dense air the boost will drop slightly, inlet air temp changes. Another thought, boost is created by load. If the load at a given rpm changes the boost will also change slightly. So weight, trim and water conditions can impact it, especially with a centrifugal as compared to a positive displacement supercharger.

Bob

on a turbocharged engine, yes, this is supercharged. The boost (impeller RPM) is directly related to engine RPM. output increases proportionally to the square of the rotation speed

Quote:

Originally Posted by Baja Rooster (Post 4625605)

If you leave one six pack of beer back at the dock and have the missus drop her bikini top for proper aerodynamics you should hit the triple digits. What boat are these shenanigans going on in?

LOL - aerodynamics ....

Quote:

Originally Posted by KeatonAZ (Post 4625876)

are you running a AWIC?

on a turbocharged engine, yes, this is supercharged. The boost (impeller RPM) is directly related to engine RPM. output increases proportionally to the square of the rotation speed

Boost increases fairly linearly with engine speed on a centrifugal I believe.

Quote:

Originally Posted by Boatally Insane (Post 4625624)

Our mini Winnebago..
a Velocity 290sc..

https://cimg3.ibsrv.net/gimg/www.off...362ac3155d.jpg

https://cimg6.ibsrv.net/gimg/www.off...3b965ff5b9.jpg

https://cimg5.ibsrv.net/gimg/www.off...9d773348f0.jpg
https://cimg6.ibsrv.net/gimg/www.off...7b91c5403d.jpg

That one ran 94.8 running 7lbs never went faster. 720 HP and 727 tq

Quote:

Originally Posted by RBeyer (Post 4626119)

https://cimg5.ibsrv.net/gimg/www.off...9d773348f0.jpg
https://cimg6.ibsrv.net/gimg/www.off...7b91c5403d.jpg

That one ran 94.8 running 7lbs never went faster. 720 HP and 727 tq

Still trying to figure out why I'm stuck in the 90's, as I have 1000hp and a 290sc hull is supposed to be faster than a 280
Talked with Steve Stepp the other day and it would seem my prop is just too deep.. I'm Saving $$ for a -2 Imco now.. ;)

Save a little more and get a cat

Quote:

Originally Posted by Boatally Insane (Post 4626270)

I always have heard that the 290sc was slower then the 280. Heavier and taller deck. The 290 VR is supposed to be faster. I have no data and may be wrong but just what I have heard by being a Velocity owner since 1996.

Padraig

Quote:

Originally Posted by Boatally Insane (Post 4626270)

Mine was 4200 lbs dry. I ran a B-max 1.30 with a 28 labbed Bravo. I think I could have run better with a shorty. It was turn key though for 6 years and super quick. There were faster boats at the time they just didn't have near enough lake to catch me. Made 685 TQ at 2800 RPM.