How did it bro?

You' are further along than I am. Trying to dial in the EFI. I think I have a cracked spark plug. I heard a snap noise when I was installing it, removed it but couldn't find anything wrong. BUT I have a miss and occasional firing of that cylinder. When it fires the AFR gauge jumps. If you can't get a stable idle you can't go any further. I have to make a couple of temporary mufflers so I can run this thing on the hose without pissing off all of my neighbors. Hauled it to a local SMALL lake near me Sunday afternoon and tied it to a dock for 30 minutes. That is when I figured I had a miss and located the issue to cylinder #5. As I was en route home a sheriff was headed toward the lake.

Well I was very close to getting it in the water but it just didn't happen. The biggest reason was I didn't use enough sealant when I installed the carriers in the new lowers and both leaked and I didn't have any of my drive tools. One badly and the other a little bit. It WILL hit the water this upcoming weekend. I just really hope the props work, because I don't have much time now to get new ones if they don't for the 4th weekend. Wish me luck!

Sunday before I tied it to the dock I modified my X drive upper to clear the Maximus 5 blade prop with the -3 shorty. I made my own hydraulic press. Floor jack and a 7000 lb pickup. I just used two pipes on top of the jack lift pad, put the IMCO stainless cavitation plate on top of that and then put another pipe at the point where I wanted it to bend, rolled it under the truck frame and jacked up the truck. Worked like a dream. I then installed it on the drive and used a sawsall to cut off the amount that was underneath. Prop clears with 1/4 inch to spare. I then cut 1 1/2 inches of the bell off the back of the new to me Maximus prop. The Daytona didn't like the bell the last time I had a Maximus prop on it. I just love chopping up a $600 propeller.

Hey those engines sound familiar.
I thought they were loud until I fired up the 598

My Gils are dry to the tip and without the silent thunder swim platform on the engines were unbearably loud. I couldn't even give my dad instructions when he was 3 feet away, because he couldn't here me. I'm glad i didn't go with a tubular platform, because I would need to be running mufflers. Even though the silent thunder no longer holds water, it still muffles things a lot. If your 598 is dry to the tips then I can imagine it quite loud.

I'm running 30 P Bravos and like your Maximus the bell is removed. That is the only real thing that worries me, I'm sure the pitch is fine, I just hope that without the bell on the prop it will still get on plane fine. My prop shaft is still around 5" below the hull even with the shorty, so I am by no means pushing the limits. No wonder Formulas are not all that fast. With the shaft 7" below the hull, the drive was creating a ton of drag.

I finally got the boat in the water. Out of the hole is very good, cruise, cornering, trim reaction are all vastly improved. In Lake Michigan yesterday, the waves were 3-4' and the boat rode better than it ever had before. I got the boat up to 74, and if felt solid and predictable (not in Lake Michigan). With all first days on the water, there were some issues. The Starboard engine's valve cover was cracked, so I had to replace that because it was spraying oil at higher RPM's. Then the Starboard engines sea pump lost an impeller ear and restricted water flow, so that caused the engine run warm. I'll get some numbers next trip out, but overall I would say this project was a success.

Yes sounds good!

So here are some speed numbers.
56 MPH at 3400 rpms- 12% slip
70 MPH at 4200 rpms- 10% slip
80 MPH at 4800 rpms- 6% slip.

So the obvious change is that my slip numbers came way down. The props are Bravo Ones- 30P labbed by BBlades and repitched to a true 28P. With the old set up top speed was 70 at 5300 rpms and 14% slip. That was with some Merc labbed 25P B1's. Based on the old slip numbers the new props would have worked. However my slip as dropped so much I'm probably going to need to go to a set of 26's.

Now with all that said I know I have around 2 mph to gain by trimming the extra long skegs down. I'm sure the carbs are not dialed in so a bit more there. I'm guessing there is another 5-6 mph to be had by getting everything right in the set up, but for the first real run the best was 81 mph.

You have come this far! Keep the Props add more HP