SS930

I would think the 400's would offer more long term reliability (likely have more robust lowers too, which is an issue with 300x's on a 32), would get significantly better fuel economy, and have significantly better resale. Not to mention no smoke and be whisper quiet.

skate

I agree with all these statements. Although the smell of two cycle oil in the morning..... I heard that Steve's boat pulls very hard in mid range also. I wonder what the difference in mid range torque between the 400Rs and triple 300Xs or XSs. Just wondering if you will have significant gains with trips 300s versus twin 400 when you consider extra weight and lower unit drag of trips.

Double Rigged

iTrader: (1)

Twin 400r's with fluids (motors only) 1368lbs
Triple 300x's 1440lbs (motors only)
Also 1extra trim pump and battery.

975hp vs 800hp.
3ea smaller lower units vs 2ea club foots.

boat for boat IMO I think the triple 300x set up will eat a 400r package for lunch. I can't imagine as hard as my boat pulls now what it would be like with a 3rd motor. Or maybe I can

Guess we all need to go for a ride in Steve's boat LOL!!!!

Gotta love this stuff

skate

My post worked! Lets all invite ourselves to Steve's house for a test ride....

Taboma

I'm in! Steve, dinner too???

skate

Well we've discussed this at length and I agree, but I've kind of been trained to look at numbers and crap like that. I can't find the Torque/HP curve for the 400R anywhere. But with super chargers it's got to make some serious torque and torque makes boats fly. When Pete was in Steve's boat for the dial in he said it pulled hard like a bigger I/O boats. So we know 114 vs 120+ In top speed is given so far but in the mid range where I live what will the difference be? Will heavier more powerful triple 300X or XS with three lower units in the water pull away or will it be even in the 50 to 100 range? I bet there will be very little difference and the 400Rs may surprise you in mid range. I know my old 338 is heavy as a tank but is stupid quick the with big torque the super charger produces.

[ATTACH=CONFIG]553284[/ATTACH]

Courtesy DBR

Does anyone have this info for the 400R??

Double Rigged

iTrader: (1)

Spock did you take into consideration of your graphs and the multiple factors of 3 versus 2?????
LOL
It would be nice if they had one.
Keep in mind the 400r does not make 400hp until 7000rpm either.

I am will to send Steve my Garmin Virb to log some video runs and acceleration runs. I can do a comparison with my boat. Would be cool to see.

bulletbob

My .02 cents. If your keeping it for 5 to 10 years repower with XS'. If going to cut loose rebuild as I have done multiple times with 2.5s'. As someone stated earlier the promaxes are cheap to rebuild. You made the argument for not going with the 400s. I run 15 to 20 miles never going under 80 on average says the smart phone. I generally run 65 to 90 miles every outing. The two strokes with OS mids rule that world for me!

skate

Patience Grasshopper. If some one can provide me with the double top secret Mercury Racing Dyno sheet for the 400Rs I'm ready to calculate out the torque vs surface area of the three screaming memes versus the two roaring tigers with the "Club Foot lower unit"

[ATTACH=CONFIG]553289[/ATTACH]

Then again I may just get my kids to do the calculations.

johnmiffco

another consideration is size
400 is a 6cyl 158 ci or 2.6 litre motor
300x is 3.0 litre making 325 @5,000 rpm limited at 7
so 73lbs heavier which is approx. 10 gallon of fuel is nothing on a 32' boat
but talking mid punch
975hp at 5k
say 400 makes 350 @5 is 700
with 3 blades to help each other for less slip with 975
is a monster in the mid,,,,,
got to remember talking o/b
as 6cyls and 400 hp is all we have to work with
just as in the new ccs 3 run x ,,,4 run approx. 10+ faster,,,they have hit 100 on a vee with 4+ 400s to get there
I/o u have 454 -900 ci to work with ,,,,,330hp -1650
so them twins are different world
less hp needs more help,,,,,,,
these new hulls are lots different than the older hulls
so more power needed,,,,,,,