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Prop/Drive Height Advice NSX

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Old 07-07-2014, 07:37 PM
  #21
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Here are a few more pics from my trip to Young Performance Marine last weekend. Eddie Young and his young apprentice Travis work hard for a living. We took the boat out two times dialing in the Air Fuel ratio and trying out props. We tried a Maximus 32/15.25 with a shortened diffuser ring and a 32 stock Bravo 1. The Maximus had so much bite the motor had a hard time picking up rpms to plane. The 32 Bravo planed much better but was really loose at speed with a lot of slip, We're thinking about trying a Hydromotive P5X but the previous owner mentioned that was on the boat before and didn't carry the nose very well. I wouldn't mind dropping the X-dimension down with a spacer and going back to the 4 blade Bravo. Any thoughts?
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Prop/Drive Height Advice NSX-shop-launch-ramp.jpg   Prop/Drive Height Advice NSX-launch.jpg   Prop/Drive Height Advice NSX-checking-leaks.jpg  

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Old 07-10-2014, 07:48 AM
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We talked with Art DiNick at American Offshore. It sounds like the drive is just too high. We're going to try a spacer and stick with a Bravo 1 style prop. Will keep you posted.
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Old 07-28-2014, 08:47 AM
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Rob, thanks for the ride Saturday. Popped my cat cherry! Boat is on rails at 90 MPH. Eddie and crew did a great job!.
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Old 07-29-2014, 07:01 AM
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Thanks Jeff, I'm really please with how the boat handles. It's not as fast as I thought it would be on the top end but overall handling is awesome. After a few WOT pulls I thought a saw 95mph on the GPS speedo. I hit the speedo recall option on Sunday while putting the boat away and it said 93mph. That's with a 3" raised box and a 2" drive spacer turning a 30 pitch labbed prop at 5400rpms. The slip is in the single digits but I think the drive needs to go up a little. The engine starts, idles and behaves like the 454MAG in my previous boat. Eddie Young knows how to build and tune an engine, that's for sure. Kuddos to American Offshore for building such a fun boat to drive, this thing's sweet!
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Old 07-29-2014, 12:52 PM
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What prop did you use and where is your shaft in relation to the bottom of the boat.
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Old 07-30-2014, 07:39 AM
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30 B1, prop shaft according to my measurement is currently 1 inch below bottom of boat with IMCO box
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Old 07-30-2014, 08:22 AM
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Thanks for the info, Are you using a thur hull water pick up or are you getting water thur the lower. I'm getting ready to start testing with mine gain.
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Old 07-30-2014, 12:55 PM
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The lower unit is IMCO SC with low water pickup.
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Old 08-03-2014, 03:50 PM
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Rob, the last day that Travis and I ran it, I squeezed 101 mph out of it. It was pretty warm (low 90's) but there was about a 1' chop and the boat loved that water.

I agree that it needs a 1" spacer instead of the 2" spacer. I went with the 2" to keep the thing safe and driveable until you got a little seat time in it. Let me know when you are ready and we can get the 1" spacer on the way. Be safe out there and enjoy it.

Thanks for the kind words.
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Old 08-06-2014, 05:42 PM
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Nice ride, slight hijack for Eddie, how have the World Products stuff been looking since the PBM buyout?
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