29 with twins
 

How many are out there? And how do they run?

Re: 29 with twins
 

frankscarab here has a 2000 twin 350. runs 60-61 GPS here in canada. Guys in the U.S. claims 65 to 69 !!! I know another guy same boat also runs same speed,60-61...

Re: 29 with twins
 

Same here, honest 60. 94 twin 350 carb mags alphas. I find the boat a great overall boat. Trailerable , easy to maintain , with the engine and drive package I have not very expensive. Replaced all the running gear this year for like 13000, reman mercury long blocks , 2 new transom assemblies and drives. Ready for another 12 years! I do wish I had a bit bigger boat on those rough days but the cost to own and run this boat keeps me in it.

Re: 29 with twins
 

68 prior to pro-chargers. Check it out.

Re: 29 with twins
 

mine was a 98 with 350 mpi's ran 68 on gps 1/2 full of fuel...

Re: 29 with twins
 

I know the mpis are faster. My buds 96 is rigged 2004 with mpi mags and bravos , runs like posted 66-68 on gps for sure. One other option I wonder if would make a difference is the sport tabs and hyd steering. We both have the bennett dual ram tabs.

Re: 29 with twins
 

I have a 1999 29 With Twin MPI 350/300hp Motors. The best I ever got was 70.0(?) on GPS running down stream Middle channel Lake St. Clair Michigan - with a strong tail wind, light fuel and light wife! Than was once.. Never aging did I hit that speed, the best after that was 68.1(gps) .. Than it was (67, 66, 65..gps)..

I had to replace a faulty head gasket that dropped one cylinder to 80psi. I'm thinking I should see 68/69 now seeing I'm able to turn my 23p props 5000/5100rpm. Before I replaced the gasket I was only able to turn my props at 4900-5000rpm on the good engine and 4600/4700 on the bad engine, so this head gasket was a on going problem most the summer till it completely burnt through at the end of the season.

My winter project; Lightning Headers, K&N filters, ECU work and sending my props to throttle up.. I should get 72/74 when finished.

Re: 29 with twins
 

My stainless marine headers K&N filters (which I still have for sale) and prop work gained me 1 mph. Good luck. It did sound much better though. To get mine to run anything above 69 on it's best day took a little bit more $$$$...

Mine has steering and K planes, nose cones. All the good stuff.

Re: 29 with twins
 

That's All? - Tyler Crockett and other said with those mods 72/74 was very reasonable speed.

Re: 29 with twins
 

I doubt it, those mods do not gain all that much HP IMHO. As we all know there is no cheap speed for boats. The bad part is the mods you described will still be several thousand bucks.

My boat was tested and the headers installed and retested in the same day. No real noticable change except for sound. I think it accelerated faster but that may have been the noise, as there was no real way to measure acceleration. My 23 pitch mirage plus props were labbed my Mercury, the K&N filters seem to help the transom smut a little but thats about it. I did not reprogram the computers until I installed the Prochargers. IMO prochargers or something similiar are by far the best bang for the buck. Under normal non-WOT cruising I use less fuel then I used to. I now have 28 pitch props and easily cruise at 50+ mph at 3000 rpm.

Just my opinion, and yes everyone has one, however I have the boat that has proven some of this.

Re: 29 with twins
 

Have you dyno'ed your engines with the pro-chargers? if so what HP are you running with your low psi set-up.

Re: 29 with twins
 

Bern did u sell to a guy named Tom Flyn?

Re: 29 with twins
 

no dyno time. Motors have never been removed or opened up. IMO if it is set up right it is an awesome setup.

Re: 29 with twins
 

Was Pro Charger able to give you an estimated horsepower with the set-up you’re running? I’m guessing around 400hp per motor according to http://www.go-fast.com/boat_speed_predictions.htm -

Re: 29 with twins
 

Pro-chargers give some numbers but i think there are too many variables. I could push mine with timing and lean the fuel system out to get more speed but I don't think the risk is worth it. there are also pulley changes that could be made. I believe mid 80's with 7psi is feasable but has come risk as with any mods that are done. I think you are close. Boat weighs 6400 + fuel and gear. 100 gallons of fuel alone is 800+ lbs. Odd thing with my boat is it is faster with a tank full of fuel. Some weight was also added with the Pro-chargers.

Re: 29 with twins
 

If I recall you were getting 71 out of your stock boat with “Huston Props” With my mods (Exhaust, K&N & ECU Works) along with throttle up finished props I don’t think 72/73 is totally out of the question.


Did you ever sell those extra props you had?

Re: 29 with twins
 

The one time 71 best was with the filters exhaust huge tail wind nose cones cool fall early morning weather and major current. In most cases it ran 66-68 depending on conditions but saw 69 on more then one occasion. No I don't have any props left right now. I sold all of them when I put the chargers on. I hope you get what you expect, keep us informed.

Re: 29 with twins
 

Well I need the parts anyways, I plan to strip and race the boat in the #5 Class. So I'll bolt up one part, test and report, bolt another and so-on. I'm running 68.. If need be I'll pull the motors and cam them to get a little extra.

Re: 29 with twins
 

My boat also is faster with more weight. I run in the 90's with twin Pizzagalli Racing small blocks and Blackhawk drives.

Re: 29 with twins
 

I have read that blackhawks are good for 5-6 mph. i wonder what a set of 2 inch shorter drives would be good for.

JP, you going to send me pics of the Chris Cat?

Re: 29 with twins
 

:rolleyes: 2000 with twin 350 MPI's, 67.5 on GPS and have only seen it once. Boat has only 60 hours but don't think that makes a difference. Running stock 23" Mirage +. Tried 25" Mirage + labbed, but ran slower.

Re: 29 with twins
 

Your probably about right. stock motors don't make enough power to turn 25 pitch props, already been there done that.