200hp SHO Hydro Tech Flash to 300 prop recommendations

[awdooy]

Pitch up 2 over stock...for most props...maybe 3 for Bravo 1 XS's...depends on boat as well..

Thanks for the input

[Stroker250xs]

Nobody said it wasn't possible.
I personally wondered what Yamaha does to pull 100hp out of a 4-stroke engine.

Hydrotech guys have it figured out! It’s crazy some of the mph these guys are putting up with sho’s! If I’m not mistaken they hive hit 114mph with a 21 Stroker with a sho

[J Risco]

It's easy to pull power out of newer injected 4s... lot of companies been doing it for years... I know for a fact motorcycle manufacturers have been. Reduce injector timing/pulse width, reduce air flow, retard timing, amongst other things.

[CGWright]

I’d recommend a 26 T-2 vmax sho prop or a 27 T-2. The sho likes high rpms. I prop mine to run as close to 6200 as possible

What about a Razor 4XL ?

[WPC3]

What about a Razor 4XL ?

I have a 28 Razor 4xl I’ll sell if you wanna try it. I don’t know anyone with a Skeeter running one. The Razor 4 xl performs really well but is not as fast top end as the T-2 vmax prop.

[CGWright]

I have a 28 Razor 4xl I’ll sell if you wanna try it. I don’t know anyone with a Skeeter running one. The Razor 4 xl performs really well but is not as fast top end as the T-2 vmax prop.

Isn't that a little too much pitch? I was thinking it should be about a 25p.

[WPC3]

Isn't that a little too much pitch? I was thinking it should be about a 25p.

yeah probably so. I think if you looking for good top end you should stick with the large diameter 3 blades

[skennedy]

The hp is already there guys . Factory de tunes them to the hp required . 200 225 or 250 . Motor is born a 300 hp plus eng to begin with .

[Wayne Worthy]

We have been flashing these engines for over 10 years! Need to prop 6000 to 6200 rpm

[WPC3]

We have been flashing these engines for over 10 years! Need to prop 6000 to 6200 rpm

For sho��

[FastBird]

I'm not saying it can't be done but I'm questioning if it can be done with just an ECU upgrade.

So the stock injectors are going to handle that much extra flow??? and the intake runners and head are going to handle the extra air movement it takes to make 300 horsepower?

I'm just asking the question, because I'm just an old dumbass drag racer.

I agree w you 100 percent. Drag racer here also.

I've said it a few times on here that 100hp isnt possible from just computer controlled changes. Instantly I was dismissed. You know in an auto engine it isn't possible. Super/turbo applications yes...NA...no.

But...fwiw...they do flash em and they do increase in mph. A local guy had a flashed 250 sho on a bug. Idk what hull it was. Late model, 2 to 3 years old. Buddy has a 21x bullet 250 PXS. Nobody outran him last year at one of the local jackpots. Another guy has a a 10 year old or so older bug w an alleged non flashed 250 sho. Buddy's Bullet is consistently 4 to 5 mph faster than the older skeeter when the flag drops. Dude w the late model sho fished a few nights. The flashed bug ran right in between buddy's Bullet and the older non flashed bug. Without knowing the hulls i question, I know it's not apples to apples.

Same guy that had the flashed sho/bug, just bought a 920 bird w a 250 sho. Ran 77 by himself a couple weeks ago. I assume light load?. He sent his wheel to Mark and is having it flashed as well. Be interesting to see the results.



Anyway I contend that the 50 to 100 flash isnt an actual 50hp to 100 hp flash. Dont care what Yamahas dyno charts say.

[cody161]

I’m thinking these motors have VVT (variable valve timing). That’s basically an infinitely adjust camshaft controller by a computer. Factor in VVT, injector pulse width, timing, etc. and a 100 hp tune is certainly achievable.

[CGWright]

You should see some of the tunes and HP increases they are getting with a 3.5L Ecoboost... 125+ HP. Can't say it's not possible on the new engines, especially the turbo versions and diesels.

[FastBird]

You should see some of the tunes and HP increases they are getting with a 3.5L Ecoboost... 125+ HP. Can't say it's not possible on the new engines, especially the turbo versions and diesels.

Of course it is easily achievable with power adders...turn the boost up and bang. Seems obvious. Naturally aspirated, not so much.

[FastBird]

I’m thinking these motors have VVT (variable valve timing). That’s basically an infinitely adjust camshaft controller by a computer. Factor in VVT, injector pulse width, timing, etc. and a 100 hp tune is certainly achievable.

I haven't seen an auto engine tuner/flash/chip (non power adder (turbo/super) that can pull a claimed 100 horses? I get what your saying, but 100hp is pretty dreamy, imo.

[FastBird]

I’m thinking these motors have VVT (variable valve timing). That’s basically an infinitely adjust camshaft controller by a computer. Factor in VVT, injector pulse width, timing, etc. and a 100 hp tune is certainly achievable.

I haven't seen an auto engine tuner/flash/chip that can pull a claimed 100 horses? I get what your saying, but .4 hp/cubic inch increase with a tune seems dreamy to me.

[FastBird]

Double post. Sorry.

[Savage]

I haven't seen an auto engine tuner/flash/chip (non power adder (turbo/super) that can pull a claimed 100 horses? I get what your saying, but 100hp is pretty dreamy, imo.

I agree!

[CGWright]

I can tell you of one boat with a 200HP SHO that has the ECU flash, and it added over 15 mph above stock. Of course the prop was also pitched up by 2.

[Nova Kaw 650]

Don't think of it in reverse. A flash isn't "adding" power. It's just returning it to the factory potential.
And many people posting are correct; you can't simply flash from 200hp to 300hp in a naturally aspirated 4-stroke. Increased injector flow rates mean nothing and don't add power, unless you're adding more air. As well, you can only take out so much ignition timing advance before the motor will run very hot.
While I know nothing of the inner workings of the SHO, there are only two things that can take/add 100hp out of this motor; cam lift and duration, and much more likely, electronic throttle control.