I replaced the injectors on my LQ9 with some aftermarket ones, they are flow-rated at 640cc @ 43.5-psi. Just to try it, I started the truck and it ran (!) and after I shut it off I did the following math:
1. rated flow = 640 cc/min
2. 640 cc/min = 62.75 lb/hr (rated flow)
3. rated psi = 43.5 psi rated
4. operating psi = 58 psi (measured)
5. SQRT(58/43.5)*62.75 = 72.45 lb/hr -or- 9.1288 g/sec actual flow
OK SO I put "9.1288" in every cell of the IFR table B4001, the truck has a return-style system with FPR, and now the truck refuses to start. The original value (3.xxx) from the factory tune is doggy but WILL start the truck. Has anyone seen this behavior before? Better question, anyone got the right IFR values for the Delphi Mini-60lb injectors sold by Five-O Motorsports??
Mr. P.