monoblade throttle body
 

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

any1?

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.

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

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?

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

35/25,

Don't you have work to do

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

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

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

But its on the Interweb so it has to be true......I wouldnt waist your money

Arizona Speed and Marine is a bunch of dildos.
That monogay is a waste of $$

In back to back testing with closely monitered AFRS and tuned back to same afr Ive seen the 8 to 12 hp gain on 500s, also seen the stock 500 FA reduce hp even on a stock motor, Smitty
525 tb or TPIS is just as good or better, wasnt AZSM neccesarily that was great

https://cimg8.ibsrv.net/gimg/www.off...23176e623b.jpg
https://cimg0.ibsrv.net/gimg/www.off...28764c5a6f.jpg
https://cimg9.ibsrv.net/gimg/www.off...10e39155de.jpg
Did alot of testing on a bone stock 500, the crazy plenum a guy sent me to test WITH 525 tb added more tq and hp to a stock 500 than anything else that you can easily "bolt on" (NOT talking cam or heads), 500s have too small of a plenum from factory and small tb that is a slight restriction, Modded (cam, heads etc) the stock FA quickly becomes the biggest restriction after the TB

I know you've done a bunch of testing, my point was I think AZM is overrated on there claims..

I wouldnt give them 600$, you can buy a stock 525 throttle blade from merc for like 60$ and have your stock tb bored out for far less, problem with THAT is stock FA will no longer bolt on , it restricts air anyways BUT 525 FA's are expensive and hard to find, Smitty

I acquired a 525EFI Upper/Lower to swap onto my 502MPI Mag. It is complete, less Injectors, Im wanting to toss a Pro-charger M3/M4 (future growth) on unless I can find a complete Vortech kit, Just going to Run a Remote mounted Inner-cooler to simplify the Mounting system. If I cannot get the SC in place prior to swapping on the Intake set-up, Without the Cam, will it hurt anything, I have a few contacts to do the tuning adjustments on Mefi3? Im not sure I'll have the ability to Pull engine to swap Cam, it's currently at the dealer, Lastly, having a pair of Innovate widebands added, one to each manifold. - Thanks in advance. Cant seem to find much detail on this subject.

Jason at MDG built a 532ci 500EFI (4.6in bore 4in stroke) Stock heads and cam. He used the stock 500 EFI intake and it made 525HP 620ftlb. He did another pull without air cleaner, 537 hp 620ftlb. Installed the Hardin marine mono blade, 545hp 620 ftlbs. All pulls were done with all accessories and water.
[img]blob:https://www.offshoreonly.com/d998c6f1-f6e0-45b5-94eb-4cd683731935[/img]

https://cimg3.ibsrv.net/gimg/www.off...957e672e5.jpeg

Looks good, thanks for the update. I have the Factory air cleaner from the 525, after speaking to AZSM, I was told the lower 500 & 525 intake is the same, the 525 is missing the brass inserts for cooling, which may present an issue for me, although mildly if I keep up with religious flushing after Saltwater usage. The upper plenum I believe is same as well, with exception of the larger Mono Blade TB.
With the conversion, only modifications neccessary beside some mild wiring reconfiguration is the IAC motor, ill just make it remote from a hose, to use the GM style unit thats controlled by the MEFI3, I believe the 500 & 525 use a pintle type Ford style unit.
I'm doing all homework possible so I have all parts in hand when I do installation, dont want to disable the boat while at dealer, when they're done the Hull and other repairs/modifications, its going to be watertested and fitted with an appropriate prop. So hoping to get everything installed and running, Supercharger included, but im working with a 6 week time frame.
Thanks

Regarding runner length, are the 500 & 525 upper's the same? I just find it odd that most mod the 502 MAG MPI setup, shorten the runner length - I haven't noticed anyone doing this with the 500/525 EFI. Just guessing here, but the the 500/525 EFI runners look longer to me when you consider that the upper intake extends the runner length giving it even longer runners than the 502 MAG where the runners protrude just a bit into the plenum. Of course, I am assuming that the longer the runner length, the more power in the lower rpm range. Am I missing something here?

How very close that is in comparison to my old proven theory. 12-13hp typically equates to 1 mph. That’s not x 2 for twins! Hull efficiency, weight, length all play a factor however it’s always been very close from my 24’ singles to 38’ twins.

I don’t think the runners are a particularly bad length for the RPM range, or even too small on CSA. They just aren’t straight enough. Learn the lessons from everyone before you that wasted lots of time porting them.