my next question would be, if we can't use larger injectors untill we have better control of the ecu ( thanks product tester), what about using the factory injectors with a FMU and have a larger rate of gain than 1:1 ?
why 4 injectors on rg turbo
- Thread starter MCIVER
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hatchers
Well-known member
fella, you started comparing a freaking car engine to this sled simple cycle engine.....two completely different applications...this alone will turn folks away
think of an injector as an application specific variable orifice, it has a min and max range to work with for its fuel demands and air demands, an orifice is sized to work with X amount of pressure and X amount of flow.....you can only open the orifice so much more before it flat out don’t work with the application.
think of an injector as an application specific variable orifice, it has a min and max range to work with for its fuel demands and air demands, an orifice is sized to work with X amount of pressure and X amount of flow.....you can only open the orifice so much more before it flat out don’t work with the application.
This thread is about injector performance and since our sleds use common automotive style injectors and we push gasoline through them any ones related experiences would seem to be relevant.
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Snowstar
Well-known member
Your losing the point here. In Automotive application you have more cylinders/injectors to spread the fuel across to achieve X amount of HP. It doesnt require a huge jump in injector size to support X amount of HP.
Make the same HP increase with the twin cylinder 2 stroke Turbo and it needs double the injector size. You figure out the sizing required and post back.
Make the same HP increase with the twin cylinder 2 stroke Turbo and it needs double the injector size. You figure out the sizing required and post back.
well to save me a little time, do you know the size of the stock injectors lb/hrs ?
couple things I need to know,
how much horsepower do you want me to figure it out for
what would you like me to use as max DC 90-95%
and is a bsfc of .60 ok or should I use something different
and what max fuel pressure, or should I assume we are starting out at 45psi and going up in 1:1 ratio with boost.
with those I can get the rite fuel numbers
couple things I need to know,
how much horsepower do you want me to figure it out for
what would you like me to use as max DC 90-95%
and is a bsfc of .60 ok or should I use something different
and what max fuel pressure, or should I assume we are starting out at 45psi and going up in 1:1 ratio with boost.
with those I can get the rite fuel numbers
Last edited:
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Boyko
Well-known member
Lately a some newer efi system are running the fuel pressure in the mid sixties for better atomization. Not all injector are not the same so it hard to say what will fail on what injector. I would maybe go to 70 on a 65psi system and 55 on a 45 pound system but I do not like to.
Running to much fuel pressure is vary dangerous!
You can have a injector lock open and with lots af fuel to be had you can hydro lock the engine when your rpm is low. I know this has happened and turned some pretty nice engines in to ugly paper weights.
To properly tune efi for boost you need to change the pulse length on the injectors. The fuelling with boost is not linear at all.
Just adding fuel pressure a system at 43.7 psi to go from 50 hp to 100 hp you would need to run around 200 psi to your injectors.
Running to much fuel pressure is vary dangerous!
You can have a injector lock open and with lots af fuel to be had you can hydro lock the engine when your rpm is low. I know this has happened and turned some pretty nice engines in to ugly paper weights.
To properly tune efi for boost you need to change the pulse length on the injectors. The fuelling with boost is not linear at all.
Just adding fuel pressure a system at 43.7 psi to go from 50 hp to 100 hp you would need to run around 200 psi to your injectors.
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