Injector Stats Scale evenly with PSI?
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TECH Apprentice
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Injector Stats Scale evenly with PSI? I have a set of injectors that have a static flow rate of 320GM/min n-Heptane at 300kPA (43.5 PSI)
does the flow rate scale evenly with fuel injectors as PSI goes up?
If so I would run them at 58PSI then the static flow rate would go to 426.666 GM/min. That sound about right?
does the flow rate scale evenly with fuel injectors as PSI goes up?
If so I would run them at 58PSI then the static flow rate would go to 426.666 GM/min. That sound about right?
Thread Starter
TECH Apprentice
Joined: Jul 2008
Posts: 309
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Thread Starter
TECH Apprentice
Joined: Jul 2008
Posts: 309
Likes: 1
Crap. so my advertised Racetronix (Lucas) "42#" injectors are ACTUALLY 48.49 lb/369 gm/min injectors at 58 PSI which is too much injector for me. That puts my duty cycle around 55%.
Is there any reason I wouldn't be able to run them at a lower PSI?
I have a fuel pressure regulator and could trim it down to 43.5 so they act like the size injector I was looking for.
***EDIT*** yes I tried search "lower PSI with larger injectors" and many other combinations to no avail.
Is there any reason I wouldn't be able to run them at a lower PSI?
I have a fuel pressure regulator and could trim it down to 43.5 so they act like the size injector I was looking for.
***EDIT*** yes I tried search "lower PSI with larger injectors" and many other combinations to no avail.
Last edited by Cthulu; Jun 13, 2014 at 12:52 PM. Reason: include shit
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Looks like running a lighter duty cycle is ok and the racetronix pump isn't meant to supply pressure under 58PSI, something about "jet pump" which fills the fuel bucket.
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TECH Senior Member
Joined: Apr 2002
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From: So.Cal.
The problem may be that the injectors spray too much at idle...
there is a calibration parameter called "Small Pulse Adjust" which may help with this.
Edit: I meant "Transient Minimum Pulsewidth"
there is a calibration parameter called "Small Pulse Adjust" which may help with this.
Edit: I meant "Transient Minimum Pulsewidth"
Last edited by joecar; Jun 17, 2014 at 03:44 PM.
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Verdad Gallardo Is there any reason I wouldn't be able to run them at a lower PSI?
I have a fuel pressure regulator and could trim it down to 43.5 so they act like the size injector I was looking for.
***EDIT*** yes I tried search "lower PSI with larger injectors" and many other combinations to no avail.
I have a fuel pressure regulator and could trim it down to 43.5 so they act like the size injector I was looking for.
***EDIT*** yes I tried search "lower PSI with larger injectors" and many other combinations to no avail.
you can run them at their rated pressure of 43.5psi. just setup your FPR with the manifold reference removed and set the pressure to 43.5psi. Don't forget to also tune the car for this (change the ifr).
Joined: Mar 2002
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From: A Racetronix dealer near you...
If you turn the FP down to 43.5PSI the jet-pump in your fuel system will shut down.
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Manufacturer / Distributor of Automotive Fuel Systems, Components & Electronics
Please support a Racetronix dealer near you for personalized service.
>WEB SITE<
I take it racetronix has spoken to you over the phone or something? Please consult them further as they seem to know your fuel setup more than what you are telling us.