Mistress speed
 

I have a 1984 mistress 540's 600 plus horsepower. Just had valves and springs replaced. I am running Konrad drives and a 24 pitch bravo 1 4 blade. What speeds should i see and what kind of rpms should I be running. Engine builder said peek horsepower was between 5000 and 5600rpms. Rev limiter is set at 5800 rpms. Just curious on weather i need to downsize the prop to a 22 inch 4 blade. Boat topped out at 4950 yesterday with tabs set and drives slightly trimmed out.
Thanks for your input.

If those motors are truely 600HP you shouldbe able to spin the 24's. Make sure you are getting full throttle when you think you are. Pull the flame arrestors and put the throttles to full. Make sure the butterflys are fully opened.

If all is well try a set of 22's but on;y as a last resort

have a set of 22s if u need em

They like a lot of trim. Pull the tabs up bury the throttles and keep bumping the trim button while watching the speedo. You will be surprised at how much trim it will take while still building speed.

My Mistress made around 660HP. I was able to Spin 26" 4 blade Bravos to 5200RPM. I saw 73.5 with the props spinning out and around 75-76 with the props in. Good luck and enjoy the boat.

My Cafe with the same motors was also able to spin 26" Bravo I propellers. Same bottom as the Mistress.

Trim it up,you need some pretty good positive trims for the Misstress and Cafe. Like said already watch the speed and as long as it increases improve your trim, you will be surprised.

540s only making 600 jesus...whos your motor builder. I have 510 ci that are making 700. need a new motor guy is #1
5000-5600 u need to spin them a lot hotter then that to see anywhere near mid to high 70s 80s hate to say it but mistress hulls are no feather weights. Aronow didnt design the 35 to set world speed recs, he built them to finish in the roughest seas, and you have a wave crusher. i know i was there

you want that boat to go take weight out and play with set up toe in toe out prop size height everything. and....dont put too much gas in it....

Thanks for your input. I have had the boat for three years and had the motors built form scratch. they just went in for new valve train. Water reversion got the best of them after three years. No other damage was done . Valve and springs Guides ect. all replaced. New roller rockers and cam to replace the solid cam engine builder thought had marks on it.When I first got the engines 3 years ago top speed was 73gps @5400 rpms I did just run the boat for the first time with tabs set down about 3-4 on indicators and drive only set at 3 on indicator. I did not have a lot of time to play with it because of rain. Just thought i would have seen a little more then 4950 rpms at that position. I will need to play with the boat a little more. Just wondering what other boats of similar size and weight were seeing or if I was over propped.

an interesting project to make that tug go near 80. the motors are what they are cant fuss with them now, but 5600 just wont cut it. my 510s buss to 6250 and i have run them for 4 years and still run like a clock. trim the boat in 1' chop loose is fast dont get scared of it you will be safe in that sled...

I had 660-670 HP 540's with Konrads on the Mistress, best I saw was around 76-77 on GPS and that was with the drives spinning in 5400RPM.

Drives spinning out the best was 74 at 5300 RPM.

26" non labbed bravo 1's.

Throttle up said that they could have gotten me a couple of miles per hour.

The Konrads are 1.7" shorter then the TRS's but many of the mistresses had a super consertvative X dimension. It all depends on your original setup.

Good luck, you won't be the fastest , but it will eat water.

Just want to Thank everyone for their helpful advice. I ran the boat last weekend in some pretty flat water. She climbed to 5600rpm's and ran 73on the gps. I feel I still had little more speed in her. I could have raised the drives another notch. Boat handled and ran Great!! Thanks again for all the advice given on this board.

Sounds like you got it adjusted, with time you will find the sweet spot. More speed will be had with chop to put a little air in between the running surface and the water. Enjoy the boat and the new setup!