fmi

Went from a 26pitch 4blade at 67.8gps to a 30pitch 4blade bravo at77.8gps 5000rpms wish i could spin a 28 harder but cant change the rev limiter nobody works the 555ecm yet and i dont want to hit the rev limitor cause mercuiser shuts injector pulse down instead of ign down.

Alli-Runner

FMI, send your PCM555 to Whipple! They can reprogram your computer.

26sonic

fmi is that a 496 mag or 496 ho ? great results ! plan on pro charging my 1998 26 sonic with 502 efi next year!

fmi

ILL try talking to whipple but arizona speed and marine and a place in california both places said no one reworks that ecm 496mag..

ccarloss

Whipple DOES reprogram the 496 PCM. http://www.whipplesuperchargers.com/...sp?ProdID=1190

fmi

Hey tried whipple they say they only do there own system so they wont help either i guess im out of luck for now..

fountain27ho496

A 271 fastech running 67.8 on gps with 375 hp?
I saw a test on one it ran 63, the fountain was 5mph
faster, that would make it run 72 with an ho.
The formula has a lot more room but I opted for the
5 mph. Either I'm bummed or you have a freak.
Powerboat has one with a 500 I'll have to check
what it ran, seems like 70. My HO runs 67, Enjoy John

fmi

Hey my 271 ran 62 on the gps when i first got it but i took the plastic baffles out of the exhust and had a prop worked then i saw 67.8 nothing crazy just did a little work.

FAST ENOUGH

I had the stage 2 program done from Whipple and I am running a Procharger with a 5psi kit with no trouble and now have a 5450 rpm limit.

voodoo

Did you ever run the boat with the Stage 2 kit before the Procharger. I'm interested in seeing if it helped at all.