BaReNBoO42

I currently have a stock 500efi. I was at arizona speed and marines website and saw an upgrade monblade throttle body for the 500efi. It says that the 525 uses a monblade. Anyboady knwo anything about this upgrade and if so are the performance increases worth the money. If i do this do i need to recalibrate my ecu?


-Barrett

BaReNBoO42

any1?

Raypanic

Arizona Speed and Marine has developed the "Monoblade" throttle valve that flows 1300 CFM to match Mercury's new HP525 EFI engine. The "Monoblade" has bronze bushings for the shaft to rotate on, stainless steel blade, and painted to match the factory blue paint. Stock OEM sensors and throttle cable mounts in the original location. 25 HP gain is available with AS&M's recalibration of the ecu and the throttle valve.

Note: Port matching to the plenum chamber is required

You have to buy the ECU Calibration too for 350.00 too

To port match you have to remove the center web of the existing intake.

As far as speed or power gains I dont know. 25HP would make very little speed difference.

I thought someone on the board has made this upgrade. I can do a search. I am interested in this too as I am re-powering a boat right now.

Raypanic

Here is the thread I remember: http://www.offshoreonly.com/forums/s...ight=Monoblade

BaReNBoO42

thanks ray for the link. i understand that 25hp isnt goin to do much but i have twins so thats 50 more hp. Would there still be a very small speed gain?

35/25

Barrett,
I think most guys would jump at an opportunity for a 25 hp gain on a stock motor if it was reasonably priced and relatively easy to obtain, myself included.

Several years ago I was told of a general rule-of-thumb formula for figuring speed gains vs horsepower gains. It is not absolute but seems to be pretty accurate for sport boats: the expected percent gain in speed would be equal to half the percent gain in horsepower. So if you added 25 hp to your HP500, a 5 percent gain, you could expect a 2.5 percent gain in speed. You can obviously use the formula in reverse too. Say you wanted to pickup the speed of your boat by 10 percent, you would have to increase the horsepower by 20 percent.

Hope this helps.

Rich

Fountainclimber

35/25,

Don't you have work to do

Dillinger

I'll have to let you know what my horsepower number is I have a 500 EFI or 30 over with a upgraded Cam and aluminum brodix 520 dragon Slayer heads . I'm also getting from tPI a monoblade throttle body. Motors are done waiting on parts then to the dyno I'll let everybody know

cigrocket

iTrader: (3)

It will all be up to the tune and how accurate you can get it dialed in. It will also depend on fuel you plan to run. Good luck with the project

articfriends

iTrader: (1)

shoulkd makw 580 to 600 hp, the tb is worth about 10 to 12 hp on a 500 w good heads and bigger cam. the stock 500 FA kills hp , even with stock tb so keep that in mind, Smitty