difference between bass mid and offshore.

[R.I.P.]

I know they are allot of differences between them. but I am wondering in dimensions.
I replaced my bass with an offshore ridge back mid. before the change I took all set up measurements
I set up to original measurements. Now the boat runs wetter? till im in the 7000 rpm range does it lift.
it use to get dry around 6000. Any ideas. are they much differant? I know exhaust lost over prop but is this normal should i add setback?

[Brian Harden]

The offshore and bass mid are the same exact height. Did you change the entire mid section or just the can?

[R.I.P.]

The entire mid. with single plate .any difference in thickness? or setback?

[Hot Shot Merc]

The entire mid. with single plate .any difference in thickness? or setback?Only the 15" offshore mids have the extra 2" off set back built in. The ridge backs were 20" and did not have the extra set back

[R.I.P.]

so would the loss of exhaust around the prop cause this loss of performance at lower rpm?

[Scott Tharpe]

it could be weight. The offshore is a lot beefier.

[R.I.P.]

I think its only 20 lb heavier

[tlwjkw]

Which "bass" mid? Hp or production? Only difference in HP Bass and Offshore is tha can itself. Shouldn't change a thing unless just a few pounds would make a difference........

[Hot Shot Merc]

so would the loss of exhaust around the prop cause this loss of performance at lower rpm?I highly doubt it.

What motor do you have on your boat? If you went from a stock mid with a two peice exhaust adapter plate and 200 tuner on a stock 200 to ridgeback mid ((wich I assume still has the factory Bridgeport higher performance 2.4 one peice exhaust adapter plate and tuner)) then your motor may perform a little different wich might explain the rpms difference your experiencing.Thats the only thing I can think off.

[Hot Shot Merc]

Which "bass" mid? Hp or production? Only difference in HP Bass and Offshore is tha can itself. Shouldn't change a thing unless just a few pounds would make a difference........ My point exactly. Some bass mids have the high perf one peice exhaust plate and some have non high perf exhaust plates that are two peice. His ridgeback probably has the one peice

[Scott Tharpe]

20 lbs can be alot if its far enough back or not far enough back. 6000rpm is 6000rpm there isnt a good one and a bad one

[Brian Harden]

I would lower the engine one bolt hole on the jack plate and see what that does.

[R.I.P.]

it is on a one peice but has cut tuner. .I run higher rpm with this offshore about 300rpm more. you guys may be right motor is in a differant power band now. i was going to raise it 1/2"..seems i need more possitve trim now for rpm.and thats a wast. looking for a 260 to put on this bad boy for next year.

[Scott Tharpe]

I may be missing the question BUT the boat doesn't know or care how hard the motor is laboring to get to 6000 or 7000 RPM. If you told me it use to turn 7k now only 6k, I'd say yes. But your saying the attitude of the boat changed at these same RPM's.

[specboatops]

I know that when I went from my Bass mid to a Ridgeback It was harder to get out of the hole, I have a heavier boat so I assume before the exhaust going over the prop helped it slip to spin up quicker, now there is a bit more of a lul at first then it catches and away I go.

[Scott Tharpe]

I know that when I went from my Bass mid to a Ridgeback It was harder to get out of the hole, I have a heavier boat so I assume before the exhaust going over the prop helped it slip to spin up quicker, now there is a bit more of a lul at first then it catches and away I go.

I might buy that launching but a 6 and 7K with a surface running prop, I dont think so.BUT- I've been wrong before.

[specboatops]

Agreed, only sharing my expierence with mine.

[R.I.P.]

If the performance of the motor is changed by the exhaust . It's possible it has changed its power band. Now making power at higher rpm..
This is the only explanation I could see. 20 lbs. Isn't enough weight to Chang its the way the boat tops out.

[Scott Tharpe]

the powerband isn't holding the boat up out of the water, the prop is. The prop doesn't care what the motor has to do to turn 6000 rpm. torque only comes into play if the motor doesn't have enough to spin the prop to 6K. Like I said before 6K is 6K weather you have to hold the throttle half open or full open to achieve this. Your saying that the boat is doing something different at the same RPM right?

[R.I.P.]

yes..so like you said 6 is 6 so it must be change of weight plus set up.
answer go back 2" and up 1/2". one at a time.

[Scott Tharpe]

right has to be in set up.