convincor253

You have to understand the circumstances. This was registered on a gps. It was a strong current and a pretty brisk wind in the same direction as the current and don't forget, the opposite direction was only 78 mph. I saved the recall of 84 on my gps. Believe what you want, it happened.

Beak Boater

We had a 2000 with 500 HP's spinning 27 Hydromotives, the best I ever saw on gps was 84, most of the time 82-83

throttleup

Ohhhhh...Ok.

Julie

US1 Fountain

iTrader: (1)

Hell, I'm impressed with 78mph numbers for a 502 against current and wind. You are getting some impressive numbers.

H2Xmark

502 mag mpi rev limit is 5080 rpm;s according to mercury gasoline engines model book on page22, looks like your tachs might be off a little,

convincor253

These props are stamped 30 pitch. BBlades reworked the props to perform like true 28 pitch props. Based on that, I calculate the slip on the 84 mph run at 8.62% and on the 78 mph run at 15.14% for an average slip of 11.88%.

I have been told by my certified Mercury mechanic that some 502 Mag's rev limiters were set at 5050 and some were set at 5200 rpm's. I bought the boat used a few years ago. My previous boat had a 502 Mag and it hit the rev limiter at 5050 rpm's. This boat hits it at 5200.

DL

H2Xmark

I did not know about the 2 different rev limits, my book showed the 502 mags with stamped rocker arms rev limit was 5080.rpms. still your boat runs strong, your 502;s must be putting out about 475 hp each to push your boat that fast.
I wish I could get my slip as low as yours, maybe my stelling ext. boxes are too high. might try to lower them one hole, Throttle up worked my 28 Q4's to a 29, I still tach out at 5200 rpm's with 500 efi's

convincor253

I have never tried extension boxes and I have never tried Hydramotive props. I am obviously very please with my Bravo props. What kind of gps speeds are you getting now? Have you ever tried Bravo I props?

H2Xmark

no, but I am looking for some 30 pitch bravo1's to try, my boat was rerigged by Leon at Derberry marine, he installed the 500efi's and put the boxes on it, I bought the boat from the person that had all the work done on it, he moved on to a cruiser