Tralfaz
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| posted on 28/3/05 at 11:41 PM |
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Modified Yamaha R1 Injection. (? - for Efi or electronics experts)
Hello All.
In an effort to keep everything below the Bonnet line in my Series III sized chassis, I have relocated my throttle bodies by creating a set of an
intake runners (see pic.) I have also fabricated a set of injector bosses which relocate the injectors the same distance from the intake valve as in
the stock setup.
I have been contemplating the possibility of running dual injectors. Utilizing the 'new' relocated injectors at low Rpm's or in crusing
mode, and switching to the original (outer) injectors at upper rpm's with wide open throttle (hopefully allowing for better vaporization).
How to accomplish this is the issue. I am wondering if it is possible to simply add an independant module that simply reads Rpm's and the
Throttle position Sensor and switches accordingly. Perhaps a microcontroller of some sort?
As a side note,
I will be using a Power Commander IIIusb with the ignition module when it comes out.
.JPG)
Any thoughts or comments appreciated
Brian
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tks
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| posted on 29/3/05 at 12:25 AM |
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ok...
ok...here we go....
double injectors is only needid if:
the duty cycle of the injector is above aprr. 80%
but if you would increase the fuel pressue ytou can reduce injector opening time soow ideally, you want 1ms opening time @ low rpm..and highest
possible pressure..
then if you would give full throttle then you can use the full range of the injector.
but if your bike doesn't need that aamount of fuel at low revs...(pressure to high) but still you hit duty limit then you can go for bigger
injectors
or if needed make a dual system
basicly you will devide the pulsewidth by 2 and give eacht injector (when higher as 60% duty rpm point) the half soow injection is the same but better
duty cycle and now when going to the top of the engine you can use both injectors.
injectors always need to be as close to the valve as possible this because if not you get the latency in transport and that isn't what you
want..
TKS
if i was you will go for a home built system
then you also don't need the USB III power commander...etc..
The above comments are always meant to be from the above persons perspective.
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Hellfire
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| posted on 29/3/05 at 09:58 AM |
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Wow... respect!!! 
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CairB
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| posted on 29/3/05 at 11:48 AM |
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Tralfaz,
I understand your thinking regarding the improved vapourisation at higher RPM.
Have you looked at the Megasquirt
Apart from the upper rpm limit I believe that what you are after achieving should be possible. It may be that either the processor upgrade (MSII) for
the Megasquirt or the Ultramegasquirt would be ok for the rpm. It may be worth posting your particular problem there.
Cheers,
Colin
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Tralfaz
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| posted on 29/3/05 at 11:56 AM |
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quote:
Originally posted by CairB
Tralfaz,
I understand your thinking regarding the improved vapourisation at higher RPM.
Have you looked at the Megasquirt
Apart from the upper rpm limit I believe that what you are after achieving should be possible. It may be that either the processor upgrade (MSII) for
the Megasquirt or the Ultramegasquirt would be ok for the rpm. It may be worth posting your particular problem there.
Cheers,
Colin
Hello Colin,
Yes I have thought of that option. However, I am not sure whether the benefit of adding the second set of injectors would be negated by having to
ditch the sequential and going with batch firing, as megasquirt only supports batch.
Regards,
Brian
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CairB
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| posted on 29/3/05 at 12:02 PM |
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With the standard MS there are spare outputs that could be used for extra injector drivers. I think that someone has been working on sequential
injection. The extensibility of the system is one of the plus points about the system abeit needing the skills and time. It may still be worth posting
there to see if anyone is doing something similar.
Good luck with the project.
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tks
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| posted on 29/3/05 at 12:17 PM |
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go go go
if iw as you, i desinged my own.
or just used the bike one....
you can use from the bike all the stuff, except the MCU, ignition you also can do that and injection seq to.
in reality it isn't diffcult...
and when my car is finished i maybe also make my own for my engine (Honda VFR 800) wy? because you alsways change something like airbox or exhaust and
the minimal changes effect engine performance..
To untherstand a engine you need to compare with with a air pump.
You want with 1 single rpm the most possible air in the cilinders.
because that's the only reason you can add fuel to it and the more oxigen you have more fuel you can add....
what a turbo does is in realyti just a blower it blows air in the cilinders in that way we can add more fuel to the mixture soow more HP.....
in the airbox of most bikes (modern ones) is a MAP sensor it measures the difference in pressur in the inlet manifold and the outside pressure... as
you can imagine the bigger that difference (like on a vacumm cleaner) the more air it will suck into it.....
to stimulate the quant. of air intaken by the engine we do this:
- polish valve's
- open air filter
- polish ports
- short inlet manifolds
- better angle's to valve's
- larger inlet valve opening time
- larger inlet / outlet valve time (the succking working of escape gasses will help the incomeing mixture a bit)
all to lower the resistance what the air has...want we want more air in the engine..!!
etc..
end of course we can put a turbo on the inletmanifold... a intercooler has the same idea but what it does is cooling the temp of the airintaken soow
more oxigen per cubic mm etc..
BMW and other brands uses manifolds that can "move" change in length for every given rpm they search for the ideal air travel
lenght..etc...
the mega squirt is good for cars but if i designed i would make seq fuel injection
and add another map sensor....
because else you cant use it for hill climbs..
with other words:
Go for perfection!! do it your self!
the advantage you have is you already have all the bike sensors etc.
soow what you can do is just cut the cables who goed to the mcu (incl. conectors) and if it doesn't work you go for the r1 system.
but it is to do and you will make fast progress...
TKS
The above comments are always meant to be from the above persons perspective.
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