Project Description of a customers 1971 Monte Carlo
Removed the old Chevy 350 engine with Edelbrock intake and carb, headers etc.
Installed a brand new Crate GM LS1 5.7L 3rd Gen engine.
Engine Details
5.7L Pushrod V8, mild cam, thermoplastic intake
24x Crank sensor with Equally spaced Falling edge and unequally spaced rising edge read by a hall sensor that is powered by and outputs 0-12Volt square wave
1x Cam Position Sensor that reads a grove on the camshaft, also Hall that is powered from 12V and outputs 0-12V square wave.
Custom Fuel rails with stock 25lb/hr injectors, and a Bosch 044 Fuel pump with a rail pressure set at 55psi <stock injectors are 25lb/hr at 3bar> Injectors are High Impedence and the ECU is configured with the Transient Suppresion diode internally
Ignition coils are logic level and there are 8 that have 4 pins each, Power, coil ground, signal ground reference and +5 V trigger signal. Coils require ~5ms of dwell but will run with up to 8 and have internal current limiting.
The triggers were verified on the scope and are clean during cranking both with and without a 40amp commercial battery charger hooked to the electrical system.
The Cam sync signal going HIGH or LOW does not overlap with the main trigger signal, however it stays HIGH for 360deg's of Crank rotation and then LOW for 360Deg's
The scope shows that the Camsync occurs approximately 7-7.5 deg's between the falling edge and rising edge of the Main trigger on both the High and Low transitions.
The Rising edge of the Cam Sync appears to Occur AT TDC for cylinder 1.
Currently the motor shows 175-190RPM when cranking from battery only and 200-220RPM when cranking with battery charger attached.
Audible sound from the motor sounds like that is in fact the real speed of the engine.
I have seen no Trigger errors in megatune and do not see any RPM spikes.
Currently the motor cranks and tries to fire, but refuses to start.
I'm sure i'm missing something obvious so my configuration is posted below.
I'm using Megatune 1.1.23RC with 1.1.18 firmware. 1.1.26 firmware was tried with the same megatune but resulted in many Resets showing in megatune every few seconds.