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Thread: G2 vs Optimax

  1. #16
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    one sounds like crank and other is prop

  2. #17
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    Torque is at prop shaft so the difference in gear ratio has some to do with it.

  3. #18
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    I haven't seen Dyno's and I can't comment on the numbers, but I can tell you that between my 2014 Mercury 250 Pro XS and the 15 G2 250 HO, the G2 is much stronger out of the hole. How do I know that? When I run my Bravo 1 FS 24P on my mercury, I need to run it extremely high on the jack plate and roll on the throttle to come out of the hole or the engine will simply bog if I just hit it. (This is almost certainly due to improper venting on the prop, not lack of torque on the Pro XS) But, with the exact same prop switched over to the G2, that motor doesn't care where the motor height is set at or how fast the throttle comes on...it just rips the boat out of the hole. Having said all that, I'm confident the Merc would do the same thing if it weren't pushing a boat twice as heavy. So...there ya go, clear as muddy water and highly scientific evidence that different motors on different boats performed differently although they both had the same prop.

  4. #19
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    600 ft lb of torque on a g2? Can't see it.

  5. #20
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    Torque is cubic inch unless turbo charged!
    Checkmate 2002 Convincor 270 496 MAG-HO

    2003 Cougar 22MTR w/300xs SOLD
    90 21Skater w/300xs - sold
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    2006 Trailblazer SS 6.0l 395hp

  6. #21
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    On the prop or on the shaft, it can't be that robs that much.
    600 torque on 300 hp, I see double torque possible only on diesel motors, no way on the gasser of any kind.

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    Why Mercury would have problem with prop venting and g2 doesn't?
    were these motors tested on the same boat type with same props?



    Quote Originally Posted by Sam I am View Post
    I haven't seen Dyno's and I can't comment on the numbers, but I can tell you that between my 2014 Mercury 250 Pro XS and the 15 G2 250 HO, the G2 is much stronger out of the hole. How do I know that? When I run my Bravo 1 FS 24P on my mercury, I need to run it extremely high on the jack plate and roll on the throttle to come out of the hole or the engine will simply bog if I just hit it. (This is almost certainly due to improper venting on the prop, not lack of torque on the Pro XS) But, with the exact same prop switched over to the G2, that motor doesn't care where the motor height is set at or how fast the throttle comes on...it just rips the boat out of the hole. Having said all that, I'm confident the Merc would do the same thing if it weren't pushing a boat twice as heavy. So...there ya go, clear as muddy water and highly scientific evidence that different motors on different boats performed differently although they both had the same prop.

  8. #23
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    Quote Originally Posted by Steelborn View Post
    On the prop or on the shaft, it can't be that robs that much.
    600 torque on 300 hp, I see double torque possible only on diesel motors, no way on the gasser of any kind.
    Noting to do with whats powering it
    If you have 2:1 gearing you double the torque.

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  10. #24
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    Quote Originally Posted by powerabout View Post
    Noting to do with whats powering it
    If you have 2:1 gearing you double the torque.
    you are right gears do play its roll, but of course it does matter what's powering it, if you don't have real motor torque you cant spin prop big enough to create torque on the prop.

  11. #25
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    You dont need any movement to create torque.
    Just ask an electric motor.

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  13. #26
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    The opti has a bad dead spot below 2500 ish depending on prop boat etc. plus it has a bigger gear so the 24 feels bigger. You would have to run a 27/28 on the g2 to go the same speed at 6k but the g2 will have more bottom end even if it had the same gear.
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


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    Quote Originally Posted by Steelborn View Post
    Why Mercury would have problem with prop venting and g2 doesn't?
    were these motors tested on the same boat type with same props?
    NO not the same boat...the merc is on a multi species and the G2 on the checkmate. The Checkmate weighs about 1/2 the weight of the Ranger.

  15. #28
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    Maybe you guys have better luck with them on light boats but my brothers nehibor just bought a brand new gen 1 300 and it just popped with about 50 hrs on it. There's also a commercial guy in town that repowered with a pair of 300 G2's and had power head failure on both engines. From what I heard he kicked and screamed enough and they gave him 2 brand new engines. I think they have some good ideas but they need some more fine tuning

  16. #29
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    Guess I need to get rid of my 525Sc in my 29 Fountain and mount a new G2etec on a bracket since it has the same 600 Lbs of torque. Total bs. 600 lbs of torque from the G2??? My 4 liter Monty V-8 did not have 400 ft lbs and I know that the only thing a G2 does better is go at least twice as far on a gallon on gas.

  17. #30
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    Quote Originally Posted by ar300johnson View Post
    Guess I need to get rid of my 525Sc in my 29 Fountain and mount a new G2etec on a bracket since it has the same 600 Lbs of torque. Total bs. 600 lbs of torque from the G2??? My 4 liter Monty V-8 did not have 400 ft lbs and I know that the only thing a G2 does better is go at least twice as far on a gallon on gas.
    They claim a 20% increase in torque over the competitors. The 1.85 gear of the G2 is 14% lower then the 1.62 of the Merc 250 pro xb they compared to. So just the ratio alone gets it close to their claims. What they dont tell you is you need ~5" more pitch to go the same speed as the merc at 6k.

    The BRP chart shows the merc making just shy of 500ft-lb but Dave Bush racing says the 300xs makes 306ft-lb at the prop. Im not sure where the BRP 600# came from. Maybe someone should drag a G2 over to Dave's dyno and get the facts
    Quartershot T-3R 15" 3.5L E-Tec 1.62 Sportmaster


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