Direct Injection ECU

[mrcrsr]

I'd be straight to a dyno to save all the grief
MSII pack will trigger from the stator wire, how about crank angle still need a magnet or something I guess that saves a tooth wheel?
What do you lose if you run the Microsquirt to get a sealed unit which surely will last longer?

microsquirt does not do sequential as i think it only has 2 inj drivers(batch fire) i have one running an electronic transmission and it works great for that

[PanRonnie]

microsquirt is basicly an MS2 just without the peak and hold driver,s and only 2 ignition drivers maybe upgradeable to 4
but you would have to check
for fuel only it,s just fine 4 high impedance injectors per channel or 1 peak and hold
http://www.diyautotune.com/catalog/m...ess-p-131.html
my MS3 is running the laser intake injectors in batch fire at the moment 4 injectors on channel 1 and 2 injectors on channel 2
no problem as long as your running before the reeds injection
with 2.4 ohm per injector that is about the max per channel in peak and hold

[powerabout]

I like the idea of the megasquirt as its in a weather proof housing with one connection plug

[PanRonnie]

Well there you go

That is the nice thing about megasquirt
it, s continue evolving
and you have a large community that will try to help you out

[StratosVT]

Pretty sure there are currently no aftermarket ecus that can drive direct injectors. That may change in the not too distant future however.

[powerabout]

Pretty sure there are currently no aftermarket ecus that can drive direct injectors. That may change in the not too distant future however.

I reckon Bosch will sell you one....

[2jz]

Is their any one making aftermarket ecu that can run a direct injection outboard engine. What is the most do you think a average performance boater will be willing to pay before the cost out ways the benefit.

IMO cost would a lot greater than benefits for the simple reason you have 12 injectors to control and doing that with engine standalone system for is no less than $1000 used to maybe gain 5hp-15hp on stock setup. Then comes the fun wiring up the engine harness. Hondata engine management system is something i would to see someone do for motorola box. Hondata modifies stock oem honda ecm to give you full engine control via labtop just plug n play

[BarryStrawn]

Motec M142 and M182 are available but are not inexpensive.

[powerabout]

Many of the SUB $1000 can do it and sequential as well which is no big issue on a wet reed install but you get great starting and idle.
Due to the fact that you have to create a system to install the injectors you may as well make an inlet system and hence just making it have a higher airflow than the carbs will add horsepower to a looper but that will most likely mean more fuel as well at WOT but it will be more power and or better overrun on a light boat.
DFI would be great as you will get a substantial fuel economy increase in the mid range but now you have to create an oiling system as well.

[PanRonnie]

don,t go crazy with a higher airflow intake just yet
if you have seen the post,s about people asking about the mad intake performance you see nobody responding
in my opinion that,s only going to work if you improve flow through the entire engine porting, exhaust
same as putting a big bore carb on a fourstroke V8 without changing the camshaft or exhaust, compression, valves size
you should already see a performance gain over carburetors ,because now your fuel flow will be compensated for weather conditions
stock carburetor jetting will be set for those cold crisp spring conditions with a barometric pressure of 102 Kpa and temp of 10 dgr celcius
unless off-course you re-jet every time you go out but i have yet to see anybody do that

[powerabout]

The inlet manifold is not a very good design on a looper, so a better design allows a gain from less pumping loss.
If you go from individual throttle bores to a single, how do you calculate how big that should be?

[PanRonnie]

The inlet manifold is not a very good design on a looper, so a better design allows a gain from less pumping loss.
If you go from individual throttle bores to a single, how do you calculate how big that should be?

that is one of the dangers i was trying to warn you about people tend to go a little crazy with all kinds of modifications
and end up getting stuck/loosing interest because the cost skyrocket or to time consuming
but ok
one of the idea,s i had
<iframe src="//www.youtube.com/embed/JmmwQdsv62Y" allowfullscreen="" width="853" frameborder="0" height="480"></iframe>
i can send you the blender file (freeware 3d software)
or you could use just the plate design and install an optimax intake
they are cheap on ebay maybe even sensor,s included
second is machine something like this
it would fit o bothe the left and the right side and you could flow match it to the intake and use the original throttle plate,s

[powerabout]

Imho....
Slide front too expensive and bad idle
Adapters plus machining might equal new reed plate and horn front like an etec which has suprisingly small throttle plates.
Nothing from a merc is remotely close due to the front half design as the reeds are not stacked over each other like a merc or etec.
When you have to design once why not design right.
The reeds are down angled on a looper so why design straight in air and not down at same angle?
Thats generally done just to reuse the old throttle bodies
Cheers

[PanRonnie]

well let me know if i can help you with something!

[powerabout]

Many thanks and I will surely be asking your advise as I go along.
It would be nice to use some merc stuff but it just doesnt come close hence i plan to fabricate from the front half and forward.