GM TBI Fuel Injector Flow Rates
Flow rate based on 12 PSI operating pressure

Engine
Liters		 CID/
Cyl		 Liters/
Cyl		 gms/sec
/bank		 Lbs/hr
/bank		 Lbs/hr
Total		 Max
HP		 Flow
Cons		 Flow Cons
/ Liters
4.3 V6 43.73 0.7168 5.788 45.94 91.9 183.7 181 252.505
5.0 38.23 0.6266 6.188 49.11 98.2 196.4 148 236.183
5.7 43.73 0.7168 7.759 61.58 123.2 246.3 135 188.362
7.4 1990- 56.75 0.9300 10.144 80.51 161.0 322.0 134 144.075
7.4 1991+ 56.75 0.9300 9.572 75.97 151.9 303.9 142 152.688

BPWC = Scaler * (Cyl Vol /Flow Rate) 
Scaler = 1461.5
Cyl Vol = displacement of 1 cylinder in Liters
Flow Rate = Grams/second for each bank of injectors

Modification Example:    8.2l (502 CID) Using 7.4 TBI Injectors:
 Cyl Vol = 1.028 Liters
Flow Rate 10.144 grams/second
BPWC = 1461.5 * (1.028/10.148) = 148.17 (round to 148)

The flow constant shown is for TBI ECM's that combine engine displacement and injector flow rate into a single 8 bit value.
Increase the BPW constant to decrease the injector size for the same displacement
 Increase the BPW constant to increase the engine size for the same injector size

Calculate BPW Constant

Flow Rate
(each bank)		 Cyl Vol
Liters		 Binary
Value

Conversion Factors:

Lbs/hr to grams/sec =  Lbs/hr * 0.126
Grams/sec to Lbs/hr =  grams/second  * 7.9365
Cubic Inches to Liters =  CID * 0.01638706
Liters to Cubic Inches =  Liters * 61.02374