EFI Fuel Pressure + Injector Sizing
#1
Senior Member
Thread Starter
EFI Fuel Pressure + Injector Sizing
Turbo car. 1:1 Rising rate fuel pressure regulator. 880cc primaries + 1050cc secondaries. Should baseline fuel pressure be 45psi? I'm going from memory. I also suspect folks will tell me I need larger secondary injectors? (60-1 HiFi P-Trim .01 AR)
The injector sizing came from Anthony@Maztech of Melbourne years ago...
The injector sizing came from Anthony@Maztech of Melbourne years ago...
#4
GET OFF MY LAWN
iTrader: (1)
To get the flow the injectors are rated for you need the pressure they are tested at. Mazda rates their injectors at a lower pressure than most IIRC, but you aren't using stock injectors so it doesn't matter what Mazda does.
You obviously have a stand alone so 42-45 is where most systems are run at, start there. The system pressure is one of the changes you can make when tuning so change it if you need to later on on the dyno.
You obviously have a stand alone so 42-45 is where most systems are run at, start there. The system pressure is one of the changes you can make when tuning so change it if you need to later on on the dyno.
#6
Senior Member
Thread Starter
Well, I'll know more here soon. Ended up with an AEM EMS at the tuners request and while the car starts and idles they say at least one of the injectors is acting up so they're off to RC Engineering for a good cleaning and test session.
I see some folks Y-ing the feed line to fuel the primary and secondary rails in parallel rather than in series like they were stock. At what power level or injector size does this seem necessary?
I see some folks Y-ing the feed line to fuel the primary and secondary rails in parallel rather than in series like they were stock. At what power level or injector size does this seem necessary?
#7
Senior Member
Thread Starter
Okay, what were sold to me as 800cc+1050cc RC Engineering calls 690cc+960cc. We're going to run them on the dyno and watch the duty cycles but it feels like these injectors are going to fall short of the 400rwhp goals we had to the turbo'd motor.
If it was for bad luck with this RX7 build, I'd have no luck at all...
If it was for bad luck with this RX7 build, I'd have no luck at all...
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trickster
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07-01-23 04:40 PM