115 Looper Too many RPMS

[evin268fs]

I have a worked 17 Pitch viper, tip cup added, and pitch corrected to a true 17, by myself i can turn to 47 mph and 6400, If I stay at 6000, I run 45-46, speeds are gps. still had a little more trim to go up a but rpms were getting too way to high. Found a Turbo Flats IV, on Ebay, 13 1/4 x 19, 4 blade, will I be able to turn this? Opinions? This is on a fish and ski. Will I lose too many rpms, 400 for 17 to 19 pitch, then 100-200 for foing from 3 blade to 4 blade. What will happen to my holeshot, going up 2 inches, but adding a 4th blade?

 

[Dhadley]

Re: 115 Looper Too many RPMS

There were some packs with a 6700 rpm limiter. Or if it's a CDI pack (blue) it may not have a limiter. Anyway, as we were talking in your other post, check the tach setting to make sure it's set on position 6 not 4. From these numbers I'd guess it's probably set on 6. You're at under 10% slip which is very good. If you maintain the same slip ratio you should pick up a couple mph.

The Flats IV is a good prop. In theory you'll be able to raise the motor higher yet. I'd also keep an eye out for a 20" Raker or Turbo Lightning Jr.

 

[evin268fs]

Re: 115 Looper Too many RPMS

Will the turbo be comprable in holeshot since it is 4 blades and has the vent holes? Do they need to be worked like the Viper to trim out without venting, Viper does not have vent holes? Asking becuase I do a bit of Skiing Auction ends in aobut 6 hours

Motor is mounted one hole from the lowest setting, don't know if I can raise it as rumor is fish and skis like the prop deep in the water. No jackplate. Although I did still have some trim left and it did feel like it would keep lifting if I kept trimming. With the turbo hold at High trim angles?

 

[Dhadley]

Re: 115 Looper Too many RPMS

The Turbo 4 blade will bite pretty well. You should be able to run that 4 blade at a higher X dimension than a 3 blade, especially a Viper.

 

[evin268fs]

Re: 115 Looper Too many RPMS

lost the auction, will have to keep looking. The Viper did not bite very good before it getting worked, They added tip cup and pitch corrected, added 2-3 mph and dropped the rpms a couple hundred. Was running 41-42 at 6000 and could at 6400-6500 43.5 was best.