Allison GS, little more seat time today.

[200valeroyt]

Im not a believer in that a GS would be a slouch in the acceleration dept with a 250xb, they have plenty of torque to get a sub #1,000 hull moving.

[Ziemer]

Weight makes all the difference with acceleration. Weight and motor being equal these boats will run with any of them in a 1/4. Surprised a bunch of guys in mine.

[200valeroyt]

I'm sure you have nothing wrong with drag racing, ive done my share of it with cars and bikes. Thats not really a concern with me regarding boats, im just a recreational boater that's always trying to better MY last speed. Thats my race

[H20WKD]

Acceleration is good....hence the name.


Bob

[ZiemerSTV]

Ziemer can really drive that Allison in a 1/4 mile or top end. It is not as easy as he makes it look. I had to have an STV with training wheels
to keep up with him. Daddy "Z"

[Boomer 880]

I read about people doing an Allison-cut skeg... where on the skeg is the 'cut' and what is the theory behind this?

[whipper]

Its a swept skeg a little more cutting the leading edge back more. Or more swept back is the out come. Though most guys say now the SM can be left stock with no problem. The Allison mod for a skeg goes way back in years. I cant remember at what speed the stock SM is capable off on an Allison but theres guys that can chime in that go 110+ that would know that answer. lighter hulls and faster boat guys try many things for safety and just experimenting seeing what works and what doesn't.

[Ziemer]

On a GS, no need to do a allison cut skeg.

[Michael J Giesler]

As far as mpg I can run my gs all day on 20-25 gallons of gas I even have a 280 get good mpg as long as it's not on the rev limiter I am actually pulling mine out of mouth balls in the next two weeks

[props4u2]

What do you guys do, when coming off a high-speed run, as it relates to engine height? I have read to never cut the throttle or bad things can happen. With that said, do you tuck the engine slowly and/or drop the jack plate while letting up on the gas?

There are two major mistakes people make when letting off after a high speed run.
Number one is, they a have over trimmed and chop the throttle which turns in to an instant bow steer situation. In this instance it's best to bump the trim down first then get out of the throttle.
The number two mistake is to chop the throttle and jerk the wheel to the right which is a natural reaction since the steering wheel will want to turn to the left as the torque is released from the prop. The thing to do is to actually steer to the left slightly at the same time you drop the throttle. Once the boat makes that initial move, you can steer it anywhere you want. Once you learn this move, dropping the throttle on any 20' Allison is no problem.
On a side note, the 21' bass boats are the only Allison's that I will adjust a hydroulic plate while running at high speed and it is also the only model that I will lower the jack plate as I am coming out of the throttle.

[ZiemerSTV]

I agree trim down gradually and then come off throttle gently. It works even in an STV.

[Boomer 880]

Any thoughts on running 3-blade versus 4-blade props on the GS? Is handling any different, or is it more a factor of the blade shape?

[200valeroyt]

Slight increase yesterday, ran 95 flat. As some have stated, I think a 225 could get very close to 100 in good air, more setback, higher rev limiter, etc... I have my eye out for a clean 3.0 if anyone knows of one? Could be a 250xb, 300pm or 300x. Also, this 2000 Promax will be listed soon, less than 100 hrs on Jay Smith rebuild, top pinned pistons, small shaft Sportmaster, stock ecu. Thanks

[syclone01]

Slight increase yesterday, ran 95 flat. As some have stated, I think a 225 could get very close to 100 in good air, more setback, higher rev limiter, etc... I have my eye out for a clean 3.0 if anyone knows of one? Could be a 250xb, 300pm or 300x. Also, this 2000 Promax will be listed soon, less than 100 hrs on Jay Smith rebuild, top pinned pistons, small shaft Sportmaster, stock ecu. Thanks

Sean, that's what you need, a motor that will get you triple digits every time out like your little viper. You know you will not be happy until you have that. (hard to be happy with a slower boat) I'm sure you could get your gs close to 100 with the 225 but it would have to be perfect weather, prop, setback, weight, wind, tide etc...now if that ally just drove on a string like the viper.....

[200valeroyt]

I agree. I'm getting a bit more use to the Allison. It definitely requires port side weight, I forgot to put it in yesterday and it was quite a handful! The 2 boats feel alot different, no doubt.