This is an old revision of the document!
These values were gathered from various sources. These may not match exactly with the values you've seen elsewhere, but they should be fairly close. The problem is that each injector can behave a little differently from another of the same size and manufacturer. So there's some variation that simply can't be accounted for in all cases. Start with the values listed below and fine tune from there.
All of these values assume stock base fuel pressure (37psi for 1Gs and 42.6 for 2Gs). Deadtime is listed as an adjustment to be entered into the ECMLink application, which is then applied on top of the calculated stock adjustment. For more details on how to adjust for varying fuel pressure or how to use the fuel adjustment tab in ECMLink, see the Fuel Settings page.
|Fuel Injector Clinic (FIC)||650||-31||210|
|Fuel Injector Clinic (FIC)||750||-40||330|
|Fuel Injector Clinic (FIC)||850||-47||330|
|Fuel Injector Clinic (FIC)||950||-53||330|
|Fuel Injector Clinic (FIC)||1000||-55||330|
|Fuel Injector Clinic (FIC)||1150||-61||330|
|Hahn Racecraft||625||-18||180||Actual flow: 530cc|
|Nippon Denso (ND)||660||-31||180|
|Nippon Denso (Evo VIII)||560||-18||0||Has lower deadtime than OEM 1g/2g injectors!|
|PTE / Delphi||580||-17||180||Modified GM Rochester 17113741 injector. Actual flow: 535cc|
|PTE / Delphi||680||-29||300||Modified GM Rochester 17113814 injector. Actual flow: 640cc|
|PTE / Delphi||780||-38||315||Modified GM Rochester 17113742 injector. Actual flow: 748cc|
|PTE / Delphi||880||-45||420||Modified GM Rochester 17113743 injector. Actual flow: 840cc|
|PTE / Delphi||1000||-51||450||Modified GM Rochester 17113744 injector. Actual flow: 940cc|
These values are for GASOLINE ONLY - they do NOT apply to cars running E85! E85 has a stoichiometric A/F of 9.8526:1 while gasoline is 14.7:1. So E85 should require around 49% more fuel than gasoline (14.7 / 9.8526 = 1.49). So for 850s (as in my car) with pure E85, I would run:
450 / ( 850 / 1.49 ) - 1 = 450 / 570 - 1 = -0.21 or -21%
Using that formula works perfectly on my car. For even more E85 data, see the E85 notes page.
E85 Air Flow Support Chart:
This chart outlines the approximate max airflow which can be supported for a given duty cycle and injector flow rate on E85. 43.5psi base fuel pressure is assumed.
|Injector Size||100% IDC(lbs/min)||80% IDC (lbs/min)||Global (E85)|
|390cc||21.80 lbs/min||17.44 lbs/min||Not a good idea|
|450cc||25.15 lbs/min||20.12 lbs/min||Not a good idea|
|550cc||30.74 lbs/min||24.59 lbs/min||Not a good idea|
|580cc||32.42 lbs/min||25.94 lbs/min||Not a good idea|
|650cc||36.33 lbs/min||29.07 lbs/min||Not a good idea|
|660cc||36.89 lbs/min||29.51 lbs/min||Not a good idea|
|680cc||38.01 lbs/min||30.41 lbs/min||Not a good idea|
|720cc||40.24 lbs/min||32.20 lbs/min||-18.75%|
|750cc||41.92 lbs/min||33.54 lbs/min||-22.00%|
|780cc||43.60 lbs/min||34.88 lbs/min||-25.00%|
|850cc||47.51 lbs/min||38.01 lbs/min||-31.18%|
|880cc||49.19 lbs/min||39.35 lbs/min||-33.52%|
|950cc||53.10 lbs/min||42.48 lbs/min||-38.42%|
|1000cc||55.89 lbs/min||44.72 lbs/min||-41.50%|
|1150cc||64.28 lbs/min||51.42 lbs/min||-49.13%|
|1200cc||67.07 lbs/min||53.66 lbs/min||-51.25%|
|1600cc||89.43 lbs/min||71.55 lbs/min||-63.44%|
|1850cc||103.41 lbs/min||82.72 lbs/min||-68.38%|