Ok, I have a 415hp 454 mag in a 22 Pachanga. It used to have a 1.32:1 AlphaSS drive 22p 4 blade and ran indicated best of 74 at 4800, 10 gal. of gas and me(180lbs.) Now I have a B1 drive 1.50:1 and 21p 3 blade, it runs indicated 70 @ 5000-5050. Do y'all think I should go up to a 22p or 23p, get another mph or 2 out of it?

Thanks in advance!

I don't know. Something doesn't seem to be adding up. Either your pitch, the tach, speedo or drive is off. They add up to be 0% slip, which can't be right. Even your old combination comes up with a 3% slip. I'm thinking your tach or speedo is off. Are these gps numbers?

KHO302,

I ran some theoreticals and for top end the 3 Blade is going to be your best bet. You are running at optimal RPM at WOT at the 5000-5050 for the 454 Mag. If you go to the 4 blade your slip will decrease a bit, but by looking at the 22P or 23P you are simply swapping Pitch for RPM but I don't think that you are going to net any increases in speed. You may actually see a decrease by going to a 4Blade.


Julie

Julie, you nailed it. Thats what I was trying to ask

"by looking at the 22P or 23P you are simply swapping Pitch for RPM" so I believe I'll stick with what I got now.

Cord, no those are dashboard numbers. I guess I'm gonna break down and buy a GPS. Any suggestions?

I'm using a Garmin handheld and I'm very happy with it. Powerboat just did a short comparisson between some different models. Get an actual speed number and then post back on this thread.

I'm looking at the Garmin products, which do you have Cord? Looks like the lowend is the 76?

I believe that my unit is now discontinued. I'm using a emap. It's hand held grey scale unit. Very large viewing area which is an important feature. I wanted a hand held unit so that it would be more useful. I take this thing everywhere with me. I'll take it hiking, biking, snowmobiling, boating, I even used it once on a flight back from Florida!

I had a Garmin 45, 48, 12XL, then a 12CX and this winter I upgraded to a Garmin map76 and love it.

HOLESHOT,MIDRANGE,AND AND USUALLY 3MPH ON TOP END,we can keep your rpm where they need to be on your set-up and pickup 2 or 3 mph,Darin

Darin got back in town from fl, this weeks been kinda screwy after being gone 2 1/2 weeks. have you came up with the right set up for those trip 300 yamahas.