Fuel injectors

Flow

 * Bold denotes the rated flow/pressure.
 * Length is o-ring center to center.

Pattern/Orientation

 * Cone angle - Bosch:
 * '&alpha;80' for single cone (how much angle contains 80% of mass).
 * '&alpha;50' for dual cone (how much angle contains 50% of mass in both cones)
 * Pattern angle for dual cone - Bosch '&beta;' (how much angle of one of the cones contains 70% of its individual mass)
 * Orientation angle - Bosch '&delta;'
 * Bend angle - Bosch '&gamma;'

'''Stock injectors are dual cone with 270&deg; &delta; and have non-zero &gamma; (S4 is 0&deg; &gamma;?)


 * Injectors with 90&deg; &delta; or 270&deg; &delta; must be clocked with their connectors perpendicular to the block, such that the dual cone is parallel with the block.


 * Injectors with 0&deg; &delta; or 180&deg; &delta; must be clocked with their connectors parallel to the block, not perpendicular, such that the dual cone is parallel with the block.


 * Injectors with non-zero &gamma; must be oriented so their "bend" is oriented into the heads properly.


 * Injectors with non-zero &gamma; and a 90&deg; &delta; cannot be physically clocked correctly, since the physical connector prevents the injector from being clocked such that the bend points in the correct direction.

Note that many 0 280 158 117 injectors modified for greater flow ARE NO LONGER DUAL CONE! Verify before installing.

Spacers


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.

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



Adaptors


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.



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.

$$TKVAG = \frac{\sum_{t=0}^{TMAIN} (rk_w+rkte_w) \times KRKTE [ms] \times KVB [cm^3/min] \times 1000}{Kd [mm^3/s] \times 0.0512 [ms] \times 60000}$$