My Profile | Active Users | Member List | Search

BBC Boards » Cobra Boats » Help with set up
Print  Email  Subscribe  Help


 Help with set up
Author Post
300promax
Member

Offline

4 posts
oakdale ca
 viper 201 with 300 promax , setup help7:06 PM 11/14/2009 Reply  Edit

Hi guys i have a 1998 viper 201 with a 300 promax on it, i bought new in 98 and have tried lots of set ups to get the best performance, im currently running a 26 trophy plus prop, 8 inch bobs machine shop hydro jack plate, sportmaster gearcase with low water intake, wide open throttle around 6000-6100 rpm full tourney load, rev limiter is 6300, 2 200+lb guys, running 4 big batteries. I have been trying diffrent engine heights , prop shaft is currently even with pad
I love this boat , im just always looking for ways to make it even better, any input from you guys would be great.

Modified by 300promax at 9:34 PM 11/14/2009


jowens
Member

Offline

355 posts
Lynchburg TN
 Re: viper 201 with 300 promax , setup help (300promax) »8:07 PM 11/15/2009 Reply  Edit

What speed is the getting you? And what gear ratio is your sporty?

Where are you running the prop shaft compared to the pad on the boat? With a sporty, you can jack it up and still maintain water pressure.

I would guess the sportmaster case is costing you speed, a torque master would be better suited for your boat.
300promax
Member

Offline

4 posts
oakdale ca
 Re: viper 201 with 300 promax , setup help (jowens) »12:18 AM 11/16/2009 Reply  Edit

i dont know the gear ratio of my sportsmaster, im running the prop shaft about even with the pad , when i bought the boat new the factory "cobra boats" advised me to run the sportsmaster and not the torque master? 2 guys, tourney load,full fuel, 4 large batteries, 76mph on gps. The thing that bothers me is when i ordered the boat new from the factory i was told this setup would be a 85-90 mph boat?
Psychologist
"Tell me....what do you see?"



Offline

916 posts
Ruston LA
 Re: viper 201 with 300 promax , setup help (300promax) »8:42 AM 11/16/2009 Reply  Edit

I will take a stab at it. Here is what I would do:

1. Go to 12" Hydraulic Jackplate. (Bob's make a great one)
2. Get rid of the Sportmaster and go to a torquemaster lower unit. (you will not reach speeds in the 90's even with a 300hp engine)
3. Get your hands on a 27 Trophy Plus and after you run it with the changes above, send it along with your performance info to Mark Croxton and have him work the prop to the boat.

My guess is you would be 80-82mph loaded like you described.

Darth VMAX
Member

Offline

2578 posts
Rose Hill KANZAS
 Re: viper 201 with 300 promax , setup help (Psychologist) »3:26 PM 11/16/2009 Reply  Edit

Whoever advised you to run a Sportmaster over the Torquemaster cost you a lot of speed. Especially since you are running a pre "X" 300 Promax wich is really about a 290-295hp motor.

I agree with the above advice. Sell the Sporty and get a TorqueMaster
Cheatham200
BEER MAN



Offline

674 posts
Fayetteville Arkansas
 Re: viper 201 with 300 promax , setup help (300promax) »9:01 PM 11/16/2009 Reply  Edit

I have to agree with the Psychologist i would think this would be a great set-up.

I run a 12" Merc Para Lift plate on my 190d and its amazing how mush better it is compared to the 8" i had.

99 Cobra 190D
2.5 200 Merc
Boger Temptest
Merc Para-Lift
 


» Return to Cobra Boats
Forum Jump
Quick Reply