1.87:1 versus 2:1 gearcase

[phillnjack]

what exactly is the speed your after ?

[FORBESAUTO]

Agree 1.87 gear is better choice for boat/ motor combo. But if he is not on rev limiter and keep same prop I'm afaraid his speed won't change just turn less rpm. Now 1.87 gear and prop change may be an improvement but costly. That's why I suggest play with props and set up instead. Most props can be tried on a loaner program. If it doesn't work your not out much. Change gears and your out. I feel you can run just as fast with 2.0 with enough pitch and bite for less$$

[Snotrekie]

torgue is ET and RPM is MPH. That being said it's easier to set up on the 2:1 gear ratio but more gains can be made with 1.87.

[Jgebhardt]

Is the ECU holding you back, or are you out of motor at that 6500?
Isn't the rpm limiter on a PM 225 kicking in about that RPM? The ECU starts adding fuel to keep the RPM's down?

Either way, on a small light boat with a lot of power, the 1:87 would be my choice of the two ratios... Then prop up or down accordingly.
They come stock with the 1:87.

I think the stock rev limiter is 6800. I've run it in the he 80's with a 26p prop about 1-1/2 to 2" below the pad. My tack wasn't working at the time but if you figure it at the slip I am running now (6.3%) then I believe my rpms were close to 7100. Can't say for sure though. I bought the motor without a power and a 2:1 was what I had laying around. I may just be out of motor, it gets to around 6500 rpm's and that's it.

[David]

You are further below the pad than normal for a light 90 mph boat. It would be much less expensive to play with engine height and props than to change gears.

[Jgebhardt]

what exactly is the speed your after ?

Whatever I can get without getting into my motor.

[Jgebhardt]

You are further below the pad than normal for a light 90 mph boat. It would be much less expensive to play with engine height and props than to change gears.

I've raised the motor up since then and replaced my tach. I'm about 3/4" below the pad now. That's where it runs 92mph with a 32p cleaver. I have been out of town for two months and haven't had a chance to play with my set up any more yet. I'm just trying to get some direction because this is all pretty new to me.

[FORBESAUTO]

3/4 below pad is pretty low for light boat especially with a cleaver. Also I would think an et style prop would be faster?

[Jgebhardt]

3/4 below pad is pretty low for light boat especially with a cleaver. Also I would think an et style prop would be faster?

I am going to raise the motor some and I have a buddy with a 32 et I'm going to try next weekend.

[W2F a V-King]

Sounds like your just about there with what you have now. And getting a second LU with a cone and LWPU is no cheap option. But it might be cheaper than going into the motor, depending on what you do.

You could always get a set of 1.87 gears and put them in the LU you have.

Just my opinion, but the 1.87 ratio is better for you for the top end pull.

[RIVERRUMMER 70]

I assume u have a sportmaster case? if so ......get the propshaft even with the bottom and put on the 32"et....take all the junk out the boat and run her down to 5gal fuel or less and go fast.
should do 95.

[Jgebhardt]

I assume u have a sportmaster case? if so ......get the propshaft even with the bottom and put on the 32"et....take all the junk out the boat and run her down to 5gal fuel or less and go fast.
should do 95.

No it's not a sportmaster. It's just a standard 2:1 with a Bob's nose cone.

[90 5.0]

On your boat a 200 case with a cone should be faster on top end than a sports master anyway. It has to punch a smaller hole through the water.