joker9r

This past weekend was my first time out with my new boat, 1988 Formula 272 SR1, Current set up is twin 350mags/Alpha drives turning Mirage + 23p's

I'm getting a hair over 59mph at 4400 rpm's, I'm thinking i still have about 400 rpms still to go?... Any suggestions?

markt111

sounds like you need a set of M+ 21s

I just happen to have a set

hoozeyurdaddy

what gear ratio do you have? If you figure it at 10% slip, just for calculation reasons, with 1.5 gears it comes out to about 57.5 mph, with 21P props and 4800 rpm, its 57.3 mph. so, smaller props will get you out of the hole better but will cost you on top. so with that being said, more horsepower to get 4800 rpm with the 23 props = more speed

Pat Ousborne

I owned a 1988 272 model previously with 350Mags and then replaced with 350Mag MPIs. We reduced the pitch 1 inch on the Mirage 23s and got further up in RPM band. Even so ,no MPH gains were there.When we switched motors from the carburated 240 prop HP to 300Hps, the boat didn't gain even 1 MPH.Seems this boat would never want to run over the 60 MPH barrier for some reason?

BY U BOY

Send them to Brett and have them labbed.

joker9r

thanks for the replies.. I'm gonna have to wait untill Fall for more HP, I'll have em labbed then and start all over next summer..

joker9r

Anyone know the turn around time for sending props off to Brett?

BY U BOY

Busy time for them right now so i would think a few weeks at the least.