Hi,

My brother is buying a 1990 Donzi Z21 with a 454 (non-magnum) with a bravo drive, and exhause out the side through mufflers. Currently its has a 23 Cleaver and runs like crap.

The marina changed the proip with a Vengance & a 23 Mirage (I was not there and do not know if it was a plus or not) And they got 57 + 59 MPH on GPS Don't know the RPM's either

What props would you suggest we try?

Anybody have any idea's of what kind of speed we should get out of this boat?

Thanks in advance

Get a hold of Darin at [email protected] Email him all the info you have on the boat, he can hook you up. Later 88

go to www.donzi.net and ask there, I am sure there will be someone to help there.

YOU NEED MORE INFO/ RPMS AND STAY AWAY FROM THE VENGANCE AS THE DIA IS TO SMALL ,THE MIRAGE IS YOUR BETTER CHOICE A 23pitch? BUT NEED MORE INFO,/Darin Thanks 88 Mach 1

I have a 88 donzi z-21 468 motor raised x blocked off the side exhaust installed stainless marine through transom exhaust 25 pitch quick silver prop 72mph gps

If you have a 23" Mirage and you are getting 59 mph gps out of a 330/Bravo thats about it. RPM of the motor should be around 4800. I had an 88 with the same engine combo and that was about it may be low 60 if everthing was perfect.