I have been following his project. A well know builder up north did the build and he had somone else do the programing. This is going to get interesting :party-smiley-004:

Is this a proven or tested setup with that hull?

Good question, Baja's generally go fastest with bow lift and trimmed out, might not be carrying the bow enough. I think with the right prop, probably a 5 blade you can achieve this without going back to your original set-up but it will take some testing, Smitty

Who's dyno was it on?... Are you sure that's an accurate HP number running all accessories with wet exhaust?

Reggie I will send you a PM, thanks!

Thank you for the reply. They reprogrammed the original ecu, we did not switch anything over. On the dyno sheet there are two columns A/F Left and A/F Right could that possible be the Air Fuel reading? There isn't an AFR column, sorry for my ignorance and I have a a lot to learn.

I agree 52 is way too rich and it is not what I asked the shop doing the finally installation to set it at.

When you ask what else changed during the engine swap what exactly are you asking about?

Yes, it is fuel injected and yes the ecu was sent out for reprogramming. I just simply plugged it in.

I just did a repower myself....had a 496 and researched it quite a bit before selling it and going with brand new horses. I've heard good and very bad stories about trying to beef up the 496. It has cast internals and needs to be completely replaced to make any kind of difference with maintaining reliability. I've got the 25 OL(not the 26) and it's 150 lbs less...and my 496 mag(375 HP) pushed it to 63-65mph at 5000 rpm depending on temp. If you are turning a 26p B1 at 4900 rpm, you should be seeing 70 at least. I'm not a fan of the B1 as it creates azz lift instead of bow lift like the baja hulls require. The B1 is made for a heavier boat. My opinion is if you find the HP and start getting 75-80 mph out of this setup...the B1 will create some issues in handling vs going to a 3 blade Mirage. I'm turning a 27 M+ on my 25' but am also putting out 700+ HP.

Artic, i'm curious about your comment on a 5 blade prop? You think the 5 blade will help in bow lift? Wouldn't it be hard to turn that thing to any rpm's with this setup? If you're getting 560 HP....IMO it should be turning a 25 Mirage. BBlades can offer a more professional than mine.

I certainly did not start the thread to looking to start a war. In fact my palms are sweaty right now as I replay to everyone's questions! :lolhit:

Dave, I do not have an answer for you. This was with the prop shaft centered with the keel on the driveway. Kind of ball park. I also have a X-dim of 15.5" that is off the Performance Sheet from Fountain. But then there was the discussion of whether or not the transom angle moved the X-dim when it went back a foot off the transom. So, I am not 100% clear on this either.

This was on the builders dyno and looking at the picture it was hooked up to a wet CMI exhaust system. The same exhaust that is on the boat right now. But with this being said I don't know if it was wet or dry. What I do have is 4 dyno sheets.

2 pulls @ 5200 RPM first 529HP then 532HP
2 pulls @ 5400 RPM first 537HP then 560HP

There is no notation of whether it is was dry or wet.

We built it from the crank out with all new internals and bearings. The crank and intake are still stock.

Stock intake? I would think that would be the first thing to scrap if your goal was 575HP.

It is on the scrap list.