Have a 347 NA engine that dynoed 445 hp at 6000 rpm with a carburetor set up when the engine was built by T & L engine a few years back. Compression 10:1. They used a carburetor set up because they did not have ECU w/ fuel injection set up at there shop. I ordered the engine with fuel injection set up which was a Edelbrock Performer RPM II upper and lower with 30 lb injectors and a ProM 75mm MAF calibrated for 30lb injectors. ProM also sent a "generic tuned chip" for this set up. So--- the engine was never dynoed an tuned with the fuel injection set up. The efi set up was just shipped along to me and I installed it. I am using the stock computer with a generic Moates tune.
I knew I needed a larger fuel pump than stock so I installed a walbro 190L fuel pump and I installed a adjustable fuel regulator. Fuel pressure is 39 psi.
I installed the engine and it runs ok. I haven't had it dynoed so I don't know what power its putting out. But it feels sluggish. The EEC is not throwing any codes as I repaired those problems a while ago. I know I need the engine tuned so I started getting prepared. I installed a Innovate AFR wideband o2 sensor with controller and gauge. Looks like the engine is running lean at idle, the idle AFR is 14.7 to 16. The cam has a good lope to it so maybe thats why the AFR varys or it needs a better tune. Cam Specs: Lift: .556in /.515ex 1.6rr
Duration: 224in/236ex @.050
Which brings me to the injectors, I read somewhere that the 30lb injectors supports up to 408 hp @ 85% duty cycle. Now I'm thinking the injectors are not large enough for my set up as my engine puts out 445 hp. Maybe thats why its running lean? I'm sure the fuel pump is large enough.
Do I need to go to 36lb injectors?
I attached the dyno sheet
Mike
I knew I needed a larger fuel pump than stock so I installed a walbro 190L fuel pump and I installed a adjustable fuel regulator. Fuel pressure is 39 psi.
I installed the engine and it runs ok. I haven't had it dynoed so I don't know what power its putting out. But it feels sluggish. The EEC is not throwing any codes as I repaired those problems a while ago. I know I need the engine tuned so I started getting prepared. I installed a Innovate AFR wideband o2 sensor with controller and gauge. Looks like the engine is running lean at idle, the idle AFR is 14.7 to 16. The cam has a good lope to it so maybe thats why the AFR varys or it needs a better tune. Cam Specs: Lift: .556in /.515ex 1.6rr
Duration: 224in/236ex @.050
Which brings me to the injectors, I read somewhere that the 30lb injectors supports up to 408 hp @ 85% duty cycle. Now I'm thinking the injectors are not large enough for my set up as my engine puts out 445 hp. Maybe thats why its running lean? I'm sure the fuel pump is large enough.
Do I need to go to 36lb injectors?
I attached the dyno sheet
Mike