5 mph gain after Whipple install, something wrong??
 

30' Superboat Y2K

Motor-540 Merlin dynoed @ 600 hp @ 5700

Ran 81.5 mph @5400 RPM on GPS with 28p Bravo 1

Installed a 2.3 intercooled Whipple over the winter.

Went for a sea trial today and here's the results

30p Bravo 1........85 mph @ 5200 rpm with 5 lbs of boost

28p Bravo 1........86.3 mph@ 5700 rpm with 6 lbs of boost

I was hoping for more. Does this seem right??

These are GPS speeds. The Gaffrig liquid filled speedo read 90 mph.

Thanks

Re: 5 mph gain after Whipple install, something wrong??
 

same rpm, same pitch prop, 5mph more? someting is wrong. at least your prop slip decreased. play with some props also.

Re: 5 mph gain after Whipple install, something wrong??
 

I would think you would gain no less than 10mph, was there a dyno test after the whipple was installed?

Re: 5 mph gain after Whipple install, something wrong??
 

No. we did not dyno the motor after the install.

Re: 5 mph gain after Whipple install, something wrong??
 

Even a 3.3 is out of it's efficiency range on a 540. You will have to spin it up pretty hard, 14,000? max. SC rpm. Better yet, look for another 2.3 and intake and go with a quad rotor :D

Re: 5 mph gain after Whipple install, something wrong??
 

Is 5 lbs of boost from a 2.3 different from 5 lbs of boost from a 3.3?

Re: 5 mph gain after Whipple install, something wrong??
 

:(

Re: 5 mph gain after Whipple install, something wrong??
 

Yes,
You have to spin it too hard, and make too much heat. Your probably only making 700HP, instead of the 800+HP a 3.3 could make. Ask Dustin for more specifics.

Bottom line, you have too small a blower. Sorry-

Good news is the quad rotor idea is great. Thats what I have on my 540.

Re: 5 mph gain after Whipple install, something wrong??
 

Don't be sorry. Just another example of deception that goes on in the boat business. The person I bought it from told me it was a 3.3!

Re: 5 mph gain after Whipple install, something wrong??
 

Would an intercooler help him?