From what I have gathered, leaving the vacuum line off the fuel pressure regulator will leave the valve in the FPR in the down position thus creating more pressure? By trapping the vacuum in the FPR you are pulling up on the valve and reducing the pressure. Either way I can pull it off in 30 secs.

I hear you on the 24 lb injectors running on the stock ECU, I have been running this way for almost a year now. I tried to purchase an Xcal from steeda.ca, they are local to me. They wouldn't sell it to me without a dyno tune, I asked for just a base program to take into account the 24 lb injectors and they said my cars setup is too unique and they cannot create a tune for my car without having it on the dyno. So I want to have all my mods installed first.

The throttle response was very good with the stock intake and TB with the 24s. I had a scanner hooked up to the car once and it was pulling 17% fuel on the long term fuel trim and about 12-13% on the short term fuel trim. For cruising etc it wasn't too bad.

Another question, the SVT ECU with 19lb injectors on a 3.0L would run lean up high, but would a stock ECU with 19 lb injectors still run lean up high or would the longer pulse width compensate and actually run rich still? I am not about to go swap in 19s but I am just curious, it will give me a rough idea of how rich I am actually running. I tried swapping in 19s once off a 2004 towncar but something didn't feel right, I think the spray pattern was incorrect.

The 24 lb injectors I have are blue off a 99 split port Duratec.

Once all the mods are on I am going for a proper dyno tune and I will stop all the "ghetto" fixes LOL It was a great learning experience, I have a much better understanding of how fuel injection works now.


96 Mystique Black On Tan V6 MTX Port Matched 01 3L, 2.5L Cams, 2.5" Exhaust Optimized y-pipe, SVT clutch, Superchips, 3L split port LIM, SVT UIM, Intake, Mustang 65mm TB, MSDS Headers. Eibach Pro Kit, Torsen Diff., Ford Racing 17" Wheels.