I need help with a motor and set up PLEASE!!!!

[93Bullet20xd]

I have 93 Bullet 20xd with a 1996 Mercury 225 Pro Max that has 2000 Power heads. I was told that for my boat and motor I needed a 25 pitch Turbo TXP prop right after buying the boat. Not knowing any better I bought one. My RPMs according to my tac is maxed out at 6400 (with no rev limit). with that prop I GPS my speed at 70mph. I ran a Hydromotive 27 pitch at the same rpms and ran 82mph. So my question is could my tac be stuck at the point of 6400 RPMs? Thanx for any help..

[sjcolwell2]

matco tools sells a diagnostic tac that all you have to do is point it at the engine and it will read rpm. its like 65 bucks great tool to have. i think you can get it online. it works on every thing ans it very acuate.

[93Bullet20xd]

Ok thank you. Maybe you can help with my next question that I have been kicking around. I'm thinking about selling my Promax and getting a Optimax for fuel economy. There is absolutly nothing wrong with the Promax except the fuel consumption. Any thought bout going from a 2.5L to a 3L?

[sjcolwell2]

from what i hear the 3.0 is better on gas. but if it aint broke dont fix it

[93Bullet20xd]

http://www.matcotools.com/ProductImages/etp328.jpgIs this what you were talking about?

[sjcolwell2]

yeah thats it, i love that thing it works good you can use it wirelessly also, or clamp it on and drive good for inline four , v6, v8 two and four stroke engines

[sjcolwell2]

how much on line ?

[93Bullet20xd]

Matco tools $66.60. Does this require the cawl to be off ?

[93Bullet20xd]

Ebay has it for 42.87

[sjcolwell2]

yeah
just clamp it to the number one plug wire and let it rip

[93Bullet20xd]

how does it work wireless ?

[sjcolwell2]

you just point it at the plug wire but it will only be acurate with a few feet.