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-   -   311 Speeds (https://www.offshoreonly.com/forums/formula/187732-311-speeds.html)

offthefront 05-30-2008 07:33 PM
something is Askew for sure ....I am running 75(5250) with 28 B1's ...my motors are ~600hp ... I have 29&27 M+'s that I will be testing soon ....

66@5000 are Stock 365hp numbers ... you know for a fact that the Motors are 640hp? I did test with 26 B1s and performance was terrible ... Borrow some 28's and see if the motors will spin them ..... that will tell the HP story ....m

offthefront 05-30-2008 07:37 PM
Originally Posted by RedDog382 (Post 2573340)
My '89 311 had 645 h.p./620 ft lb torque per side and turned a solid 80+ mph with 27p mirage props at 5400 rpm or 28p Bravos at 5250 rpm. Problem with the 27 Mirage was they would blow out when trying to plane off and needed to be feathered quite a bit.

Something in your set-up is wrong or the dyno is lying ...
Chris .... were you running stock Drives or shorts? I would love to get to 80 but have yet to get even close .... I'm hoping the 27 or 29 M+'s will get me there ...m

Full Force 05-31-2008 05:15 AM
My buddys 311 with TRS with around 600 hp went 80 on gps, once.... always ran 78 solid with 25P Mirage plus at 5400 rpm.

RedDog382 06-01-2008 01:46 AM
Originally Posted by offthefront (Post 2574990)
Chris .... were you running stock Drives or shorts? I would love to get to 80 but have yet to get even close .... I'm hoping the 27 or 29 M+'s will get me there ...m
I had the stock B1 drives with 1.5 gears. I remember now I was actually running the 29p Mirages, not 27's. Really had trouble wtih them blowing out on take-off. Think I actually turned the 28 Bravos at 5300. It's been over 5 years ago now ...

offthefront 06-01-2008 11:04 AM
Originally Posted by RedDog382 (Post 2575910)
I had the stock B1 drives with 1.5 gears. I remember now I was actually running the 29p Mirages, not 27's. Really had trouble wtih them blowing out on take-off. Think I actually turned the 28 Bravos at 5300. It's been over 5 years ago now ...
that makes more sense .... I have some 29's coming .. I think ..they shipped on the 20th ...got one on the 27th ... USPS has no cluse where the other one is ....:rolleyes:

Car Biz 11-10-2010 10:41 AM
well last prop test of the year and boat ran 77.0 GPS yesterday.:drink:

Funny that by just changing props i can gain 17 MPH:eek:

I want to give thanks to Ben from Precision Power Offshore :coolcowboy:

Ted G 11-10-2010 01:00 PM
Originally Posted by Car Biz (Post 3250522)
well last prop test of the year and boat ran 77.0 GPS yesterday.:drink:

Funny that by just changing props i can gain 17 MPH:eek:

I want to give thanks to Ben from Precision Power Offshore :coolcowboy:

What props gave you that kind of speed?

Car Biz 11-10-2010 05:06 PM
Originally Posted by Ted G (Post 3250597)
What props gave you that kind of speed?
17.5 X 28 5B


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