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.
Photos are here
5.7L Pushrod V8, mild cam, thermoplastic intake
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
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.
Firing order: .... FILL THIS OUT
Did you order ECU with 0 IGBT (8 logiclevel signals) ?
h=70 60 50 40 30 20 10 00
suggests that you wired properly, and fire in this order (that tableline looks good allows easy verification of order anytime later):
- ignch7 cyl...
- ignch0 cyl...
- ignch1 cyl...
- ignch2 cyl...
- ignch3 cyl...
- ignch4 cyl...
- ignch5 cyl...
- ignch6 cyl...
h=00 2A 24 1E 18 12 0C 06
suggests that you want to fire ignch7
- trigger_tooth=01 (15 crankdeg)
- plus ign_tdcdelay=82 =65 crankdeg
- minus ign advance
so the TDC of ignch7 is 15+65=80 crankdeg
Is this a good assumption ?
24 tooth 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
Both 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.
1 pulse Cam Position Sensor that reads a grove on the camshaft, also Hall that is powered from 12V and outputs 0-12V square wave.
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 both camsync transitions occur approximately 7-7.5 deg's between the falling edge (appr midway, as 1 tooth=15 crankdeg)
Rising edge of the Cam Sync appears to Occur AT TDC for cylinder 1, that's what we configured: so the next crankpulse (falling edge) will be tooth0.
- 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 => firing order ???
Configuration and tables
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.
Links to Config & Tables below
I should have updated this page ages ago the LS1 runs beautifully on VEMS now I'll post up new configs of the last tuning we did. Its coupled to a 700R4 Auto trans with Torque converter lockup in 3rd and 4th gear has been on the road now for well over 1 year without any problems.