I've talked to a boat racer that has been in a tight competition with another team. Then he discovered that the other teams boat ran into a wall at 89mph. They could add more power but it didn't want to go faster. At this point you have to examine everything with a magnifying glass. It is going to take a lot of patience, you may be at point in the performance in your hull that may take a large bump in power to cross, or you may have some unusual anomaly that is peculiar to your boat. It is going to take time and attention to detail, create a log of each trial. I know I'm in the same situation, I'm running high 80's and want to break 90. Are you running a stock Bravo lower? I added a Hydro-Motive nose cone and it was one of the best things I did. Boat handles much better at WOT and takes more trim.

That is the best un bias advice ive gotten on here other than from BBlades. Thank you for not being a negative ignorant opinionated idiot that prob pays somebody to change your oil in your boat.. i love thia site but i twnd to get alot of advice from back yard hac

Hack artist that jump off topic and sont really know what thay are talking about. It wears me out.....

.....must be the headers thats slowing you down. What the **** ever. Lmfao!

i feel your pain..i been going throu more or less same thing with my avanti. first was up with a 2" imco lower,then was back down.then back up because wrong prop. then slip was to high but was running decent mph. then i put imco extension box on with the box i also raised engine 3".so now im 5" higher and i guess a foot or 2 farther back.im still playing with props and but also goin to try bringing drive down for less slip.goin to start with 2" spacer and go from there.i am very happy with my ext. box and also raising engine and drive 3" when installing box. good luck
mark

Ive thought about an extension box to see if it helps.

No one said the headers are slowing you down. I merely stated they're not giving you 50hp and they make a bigger difference on NA engines. I was just trying to help and you jumped on my statement.

Prop slip somes from hull design, propshaft depth, etc, not just hp. Plenty of people running 3 blade props with 600-700 hp with low slip and high speeds. How can they do it? With all that hp they should just blow the prop out just like a drag car blows the tires out and have 30% slip???

Im convinced that it has alot to do with the design of the hull. With in turn makes drive height and other prop situations more critical. The research ive done has proven to me that non step hull boats typically have less slip % than step hull boats. So my main concern ia to find a way to get clean un disturbed water to my prop at WOT. When amd if i can do that my slip % should drop into the mid teens and what ever speed im running at that point is what ill have to deal with.

At what RPM is your boost coming in? That is a good reference to look at when trying to find the correct prop. I have had two boats with prochargers and big HP. I am in Indy and have a few props you might want to try. Just give me a call and I will tell you more. 317-679-4453 Mike.

Hey dip ****. I was the dude you hung out with at cunninghams sunday. Lol. Small world huh. We were both drunk. Atleast i was but i rememberd your blue led s. Cus i got em too. You gonna be down this weekend.

Not coming down this week but I am sure I will be down soon. When does your boost come in? In my experience, if it comes in before 4000 rpm I was over proped and very much after I was under proped. Call me and when I come down next time I will bring some props for you to try.