Fuel injectors

Flow

Injector		Rated flow	2 bar	3 bar	3.5 bar	4 bar	5 bar	Spray pattern	Length	Connector
Siemens	S4	33#@4bar				349cc/33#	390cc/37#	?	52mm	Jetronic
Bosch	Bluetop	36#@3bar	309cc/29#	380cc/36#		422cc/40#	490cc/47#		?
	RS4	46#@4bar				480cc/46#	538cc/51#	15° dual	37mm
	Greentop	42#@3bar		475cc/45#		550cc/52#	615cc/59#	15° single	64mm
	Green Giant (Volvo)	42#@3bar		450cc/43#		520cc/50#	560cc/55#	15° dual
	EV14 0 280 158 117	532cc@2.7bar		550cc/52#		635cc/60#		15° dual	52mm	USCAR
	EV14 0 280 158 117 (modified?)	750cc@3bar		750cc/72#		865cc/82#
	EV14 0 280 158 123	627cc@3bar		627cc/60#		724cc/69#		25° dual		Jetronic (rotated 90°)
	EV14 B 280 436 469-01	1019cc@3bar		1019cc/97#		1176cc/112#		20° dual	37mm
Delph		37#@3bar		391cc/37#		462cc/43#		?	?	Jetronic
		38#@3bar		399cc/38#		462cc/44#
		42#@3bar		441cc/42#		515cc/49#
		50#@3bar		525cc/50#		609cc/58#		22.4° wide
Siemens	Deka IV ('03 SRT4)	41#?@3bar		452cc/41#?		524cc/47#?		Dual?	52mm	USCAR
	Deka IV ('04 SRT4)	45#@3bar		475cc/45#		546cc/52#		Dual?
	Deka ID (3172)	55#@3bar	472cc/45#	600cc/57#	624cc/59.5#	667cc/63.5#	746cc/71#	15° single	64mm	Jetronic
	Deka IV (1496)	60#@3bar	514cc/49#	630cc/60#		727cc/70#		30.0° wide
Genesis		415cc@3bar		415cc/39#		483cc/46#		Dual	52mm
		430cc@3bar		430cc/41#		494cc/47#				USCAR
		550cc@3bar		550cc/52#	580cc/55#	635cc/60#

• Bold denotes the rated pressure.
• Length is o-ring center to center.

Spacers

Bosch injector sizing guide

2 1/2" (64mm) injectors require 12mm (7/16") rail spacers when using the S4 intake manifold and fuel rail. If you are using an RS4 fuel rail you will need a 1" spacer! 1 1/2" (37mm) injectors require 15mm (9/16") injector spacers with the S4 fuel rail.

mm	inches	Bosch (not c-to-c)	S4 injector spacer	S4 rail spacer	RS4 rail spacer
37mm	1 1/2"	33.60mm	15mm (9/16")	N/A	none
52mm	2 1/16"	48.65mm	none	none	15mm (9/16")
64mm	2 1/2"	60.65mm	N/A	12mm (7/16")	27mm (1")

Note that Bosch's EV14 length specs are not o-ring center to center

Adaptors

034 Motorsport adapter

Connector	Shape	Bosch	A.K.A.
Jetronic	Rectangle	Design II/EV1	Minitimer
USCAR	Oval	Design III/EV6/EV14

Injectors are male, harness is female, so to use a USCAR/EV6/EV14 injector on a Minitimer/Jetronic/EV1 car, you need a USCAR (female) to Jetronic (male) adapter.

Conversions

lb/hr to cc/min

• 1 lb/hr gasoline = 10.5 cc/min (@720 kg/m³) - (1 (pound / hr)) / (720 (kg / (m^3)) )
• 1 cc/min gasoline = 0.72 cc/min

Flow dependency on pressure

• $Flow_{new}={\sqrt {\frac {P_{new}}{P_{old}}}}Flow_{old}$

• 3 bar = 43.5 psi
• 4 bar = 58.0 psi
• 5 bar = 72.5 psi
• RC Engineering's online calculator

Common test fluids

• Density of typical test fluid = 760 - 770 kg/m³

  1 lb/hr = 9.81 - 9.95 cc/min

• Density of n-heptane = 685 kg/m³

  1 lb/hr = 11.0 cc/min

  1 cc/min = 0.685 g/min

Instrument cluster

If you change fuel injectors, your instrument cluster will estimate your fuel consumption incorrectly. Use VAG-COM to adjust it by going to Instrument cluster (17) -> Adaptation (10) -> Channel (03).

Unfortunately, you can only set it to a maximum of 115%. Default is 100%.

If you have access to ME7.x tuning tools, you can completely fix cluster consumption by adjusting the KVB 1x1.

$TKVAG={\frac {\sum _{t=0}^{TMAIN}(rk_{w}+rkte_{w})\times KRKTE[ms]\times KVB[cm^{3}/min]\times 1000}{Kd[mm^{3}/s]\times 0.0512[ms]\times 60000}}$

References

• http://usrallyteam.com/injectors.html - Genesis
• http://racetronix.com/ - Delphi and Siemens
• http://www.synerject.com/fuelinjectors-dekaIV.html - Custom Siemens Dekas
• http://www.fiveomotorsport.com/Injector_SetsMODS.asp - All others
• http://www.srtforums.com/forums/showthread.php?t=99710 - SRT4
• http://forums.audiworld.com/s4/msgs/2091797.phtml - Flow comparison vs. stock.
• http://www.rceng.com/ - RC Engineering
• Bosch injector specifications