Originally Posted by Russ K
Using 43.5 psi as the rating for the replacement injectors has always caused positive fuel trims and a leaner afr. I really believe that the stock injectors are also rated at 3 bar (43.5 psi) This seems to be a standard test presssure.
The 1985 TPI cars fuel pressure is 34-39 psi, then in 86-90, the fuel pressue was increased to 40.5-47 psi, the 1990 ZR1 is 48-55 psi. The LT1 cars were 41-47 psi. Now the LS1/LS6 cars are 55-60 psi. These specs are key on engine off, or at 0 kpa vacuum in the IFR table for our cars.
Russ Kemp