Anyone ever put big power in 33ZX?
 

I wanted to hear from someone who has or knows anyone who has put bigger power, say 700+ a side in a 33ZX hull. Wondering how the hull handles with that kind of power and how much power it actually takes to put one solidly into the 90+ mph range? I have a 2000 33 Daytona with 500efi's and I'm thinking about a power upgrade in the future. I'm thinking about big inch NA motors but I'm afraid that would really hurt the value of the boat. A better option may be to rebuild my 500's with a set of M3 pro-chargers. Any input or even opinions would be appreciated so let em fly guys.

there's a kid in germany that just purchased a friends 598 cu. in. 725 hp cobra power for his late 90's 33 zx. he originally had 500's in the boat. not sure how he is coming on the project. he's on here (oso) somewhere.

I would like to hear more about that project as this is very similar to what I was thinking if I went big inch NA motors

There is a lot to consider when your going to install 700 hp in a boat that is set up for 500 hp.
The rigging, the drives, the hull, and the props have to work together Inorder to achieve the objected and safe results. We take all these factors into consideration for our race boats and our clients race boats when installing different horsepower.
For instance, We worked on a Cigarette Topgun with similar changes. Went from 600 hp to 850 hp. GREAT success ! Achieved from 76 on GPS to 94.

I hope this was information was helpful.

Frank
Www.powerboatsnewroc.com

94 in a straight bottom gun with 850's? Love to hear more about this

if youre worried about resale may want to look into whipples for your 500s

It is 99 gun Weth xr dr strate botom

There is a very similar 99 straight bottom gun locally that runs big inch NA motors. I would guess he is running around 800hp a side. That boat runs right about 90 on flat water.... There was a 2001 33 Daytona locally that came from the factory with 600sc's they where redone making around 650hp at 4psi boost. It was a matter of a few weeks time that I didn't end up with that boat. New owner supposedly put super chillers on it and runs 8psi boost and I hear it is running 94mph now. I hear the 33 Daytonas with factory 575sci's will run right around 90 but I'm not sure if that is stock or with mods.

I am a fan of the whipple chargers in all aspects but the price of the kits. I have a hook up on pro-charger kits so that is a big plus. My thoughts on resale value are with the pro-chargers I could very easily remove the chargers and return the motors to stock 500efi's. Another option is to just set my 500's aside for resale and put the big inch NA motors in.

I occasionally get too much stern lift right and 90 (GPS) and have to back out as the bow will start to rise and fall from this. I'm pretty sure this could be labb'd out of the prop, but my Maximus are stock at this point. If I can avoid the stern lift situation 92 is pretty easy and and the boat feels just like it does at 70. I think the limiting factor over for the speed of this boat is more the power and drive setup. No issues with the hull going fast.

micahmiles what power and drive setup are you running?

Mine is a 2003 33ZX Daytona with factory 575sci and XR ITS (integrated transom system). I've recently upgraded the blowers to TBS billet 8-71's but still only running around 4 lbs if boost which is factory, but it does force more volume than stock.

BTW, I've recently listed it for sale if anyone is interested. http://www.powerboatlistings.com/view/34166

I just alerted buddy who is running Whipples on his 33ZX. He should chime in at some point.

One of my favorite 33 Daytona's right there. Nice boat man! How did it run with stock 575's? They seem like a good upgrade option from my 500's if I can find a set at the right price...... Just out of curiosity why did you go to the 8-71's at 250 hrs and leave the boost at 4.5 psi?

Thanks, I've really enjoyed her.

With stock blower setup she would run mid-80's in fresh water in hot and humid weather. The 575SCi motor is bullet proof and a great motor with one exception, the factory Holley/Weiand/B&M "250" frankenblower is the only weak spot as it requires frequent rebuilding and maintenence to be reliable. I would take mine off about every 60-70 hours and send to Darren Meyer Performance Engineering (DMPE) to replace bearings, retime, I added teflon strips to the rotors, hard coated the rotors, etc... The Blower Shop billet 8-71 is a superior product with much more performance upside with a rebuild time in the 400-500 hours. As well, it's turning much slower to make the same boost which helps keep the intake charge cooler. Swap the blower pulley's and it'll double the boost to 8 psi. Super easy to add about 100hp per motor - just swap pulley's and reset AFR. The 8-71 also pushes more volume and you can really feel the difference in power even at the same boost.

The reason I've kept it around 4 psi is, some people have had bad luck with higher boost and stock head gaskets, some 575SCi's have Cometic gaskets and they can handle the boost, I don't think mine does, but have not been able to verify. I've I were to keep the boat I was going to add roller cams before 300 hours (I have 240 now) and at that time replace with a top quality Cometic gasket and then turn the boost up to 8 psi. I have a friend with the same setup in a single engine Nordic and it runs great. But, as I mentioned, I have it for sale as I think I'm going to have to get a more family friendly towing / watersports boat for the next few years.

I do love the boat and the power package, cranks right up, sounds awesome, runs great and never had a single problem with any of it.

I just happen to have a 1999 Donzi 3250 SS for sale.... 11 foot beam 6'7" head room in cabin and still runs 55

micahmiles pm sent

I have to jump in this thread, cuz i am the "kid" from Germany who bought the big NA Cobra Engines...

I have set them with -2" Stelling Boxes and XR Upper with - 2" Imco Sc Lower - so far so good - but as micahmiles said, the boat starts to jump up and down and you have pull back the throttles. I played with props:
31 Maximus, 34 Bravo 4 Blade and 32 Bravo 4 Blade, but all with the same result wether spinning in or out. The X Dimension was set to 4,5" and i can't go higher, but to lower is possible...

The boat don't like to trim very much and it runs best with a set to Close to 3 (indicator). Are your boats running with the same trim and has anyone a Suggestion what to try next to eliminate this dam jumping?

The boat wants to run faster, but i can't pass the 90 without to start jumping...