Fuel Injector Specs Question

Pete_89T2 · 01-13-2011, 09:23 AM

This may be a dumb question, but is there an industry standard used for FI specs?

For example, they all typically quote you a flow rate, such as 720cc per minute, but the actual flow rate achieved depends on the fuel pressure it is tested at. Is there an SAE or other industry standard that tells the OEMs what fuel pressure to test to and use for FI flow rate specs? I'm shopping around for FIs, and just want to understand this better.

NoDOHC · 01-13-2011, 11:45 AM

From what I recall, Throttle-Body-Injected is 0.75 bar and Port-Injected is 3.0 bar. I think this is a standard, but I am not absolutely sure.

sickofpistons · 01-14-2011, 11:00 PM

Quote:

Originally Posted by NoDOHC

From what I recall, Throttle-Body-Injected is 0.75 bar and Port-Injected is 3.0 bar. I think this is a standard, but I am not absolutely sure.

Would that be for the 750cc FI?

Trout2 · 01-14-2011, 11:36 PM

Typically 43.5 psi

Jack

NoDOHC · 01-16-2011, 06:19 PM

43.5 psi = 3.0 bar

I am not sure that this is a *standard* but if a complete curve is not supplied, it is typically listed at this pressure (from what I have seen).

01-13-2011, 09:23 AM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Fuel Injector Specs Question This may be a dumb question, but is there an industry standard used for FI specs? For example, they all typically quote you a flow rate, such as 720cc per minute, but the actual flow rate achieved depends on the fuel pressure it is tested at. Is there an SAE or other industry standard that tells the OEMs what fuel pressure to test to and use for FI flow rate specs? I'm shopping around for FIs, and just want to understand this better.

01-13-2011, 11:45 AM	#2
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	From what I recall, Throttle-Body-Injected is 0.75 bar and Port-Injected is 3.0 bar. I think this is a standard, but I am not absolutely sure. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

01-16-2011, 06:19 PM	#5
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	43.5 psi = 3.0 bar I am not sure that this is a standard but if a complete curve is not supplied, it is typically listed at this pressure (from what I have seen). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

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01-14-2011, 11:36 PM	#4
Trout2 Rotary Fanatic Join Date: Mar 2008 Posts: 104 Rep Power: 18	Typically 43.5 psi Jack