When are you guys firing the injectors I see the default is bottom dead center on intake stroke does that sound right. I would think that it would do better if it was to fire sooner then that
Correct. I tuned a solid roller with a IVC of 56* (596* Crank Rot.) It idled horribly, False lean cond, pump to start, Black soot on bumper, etc. Advanced Inj to 46* (10* under) and this resulted in a steady afr idle, nice throttle response. As said this has really no effect on wot.And just for reference (in Holley EFI software), a 0.0° Injector End Angle value, ends the injection event at BDC (Bottom Dead Center) of the intake stroke - before the compression stroke. This is 540° in the four stroke cycle (7th cylinder pictured above). A negative value moves the injection event before BDC, and a positive value moves the injection event after BDC. So a −180° Injector End Angle value will end the injection event at TDC (Top Dead Center) of the intake stroke (as the intake valve is opening). Obviously, a −90° Injector End Angle value will end the injection event in the middle of the intake stroke.
How does it Idle? Your IVC is 45* ABDC (585* CR). I have good results with Inj ADV to 10* under IVC. So, if I were having difficulty getting afr's right at idle or throttle response sucked, I would try raising Injector timing to 35*.Where would you start with this cam ? Also , what are you guys running for base pressure on the Holley 120 injectors ? ( 26 to 28psi of boost )
That'd be your transient fueling and fuel puddle issues. Some software allows this to be dealt far more extensively, but it it's not always so simple since we don't have OE-level calibration tools available.Injector timing has a greater affect when the injector placement is poor from my experience.
How does it Idle? Your IVC is 45* ABDC (585* CR). I have good results with Inj ADV to 10* under IVC. So, if I were having difficulty getting afr's right at idle or throttle response sucked, I would try raising Injector timing to 35*.
All setup are different so this is for testing. Don't blame me if your shit stalls. LOL