Shorties on 38 twin step side by side?
 

Curious if someone has experience with shorty drives on a 38 side by side hull, twin step (big steps, last generation)

http://i1230.photobucket.com/albums/...38fountain.jpg



Trying to squeeze some more performance out of my boat this winter, without adding more HP. Current set up is stock 575sci's with standard XR's. Factory X is 18" x 34". Has broke 90 mph a few times but real every day numbers are 88-89 at 5150 RPM, spinning B1 4 blade 32 pitch. I am rebuilding the blowers this winter, adding teflon strips (slight boost gain at same rpm) and having the ecu reprogrammed for drivability improvements.

I have a friend that has 2 -2 imco lowers. Would have loved to try them but they need a little work so I would have to buy as is, fix, then try them :/ Curious if anyone else has used them and seen performance gains on a similar set up.

Looking to be in low to mid 90 mph everyday with just set up changes (drive, prop, bottom?). Let me know if it is even possible

Thanks

I was running about 90 ( 89.990 Gps). then I did the shorties and got my proshafts centers about 5/8 to1 3/16 below the surface. Right away I went 94.8.( with some small chop) I am going to try other props here when the air gets cooler. I would say do it, if you can swith to a surface prop. Like Hering or Maximus. When I had stock drives I ran hydro props. Right now it is a little slower planing but still planes of nicely w 7 or 8 people full of fuel etc. I just put it at about 3000 and let it plane . It will plane faster a 4,000 rpms. I have the smaller steps on a blueprinted bottom. Mine had spacers on the drives so I went up 3 inches total. My headers are 5/8 from the gunnel in the rear so they are as High as possible wiitout major change. I think you will get 3,4 mph w the change.

p's I think your XR internals will fit right in the -2 cases , they did on my sportmasters.
Pic at speed http://www.mcprodesign.com/photo 3.JPG

1 5/8 is where the prop shaft is from the bottom of the boat?

From what I have gathered. 1-2 inches below the bottom is best for the drive ( xr) 1-2 above the bottom is more speed and harder to plane, plus tough on the drive..

Chad