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 0280158117 | 532cc@2.7bar | 550cc/52# | 635cc/60# | 15° dual | 52mm | USCAR | ||||
| 750cc[1] | ||||||||||
| Delphi | 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 | 2 1/2" | 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# | Dual | USCAR | ||||||
| 550cc@3bar | 550cc/52# | 580cc/55# | 635cc/60# | Dual | ||||||
- Bold denotes the rated pressure.
- Length is o-ring center to center.
Spacers
2 1/2" (64mm) injectors require 12mm (7/16") spacers when using the S4 intake manifold and fuel rail. If you are using an RS4 fuel rail you will need a 1" spacer!
| mm | inches | Bosch (not c-to-c) | S4 rail spacer | RS4 rail spacer |
|---|---|---|---|---|
| 37mm | 1 1/2" | 33.60mm | N/A | none |
| 52mm | 2 1/16" | 48.65mm | none | 15mm (9/16") |
| 64mm | 2 1/2" | 60.65mm | 12mm (7/16") | 27mm (1") |
Note that Bosch's EV14 length specs are not o-ring center to center
Adaptors
| 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.[2][3]
Conversions
- 1 lb/hr gasoline = 10.5 cc/min (@720 kg/m3) (1 (pound / hr)) / (720 (kg / (m^3)))
- 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
- 3 bar = 43.5 psi
- 4 bar = 58.0 psi
- 5 bar = 72.5 psi
- RC Engineering's online calculator
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).[4]
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.
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