4 Cylinder Turbo = How to wire Staged Injectors?
Posted: Tue Dec 26, 2017 3:50 am
I have a 4 cylinder engine...planning to go 700 plus HP...so I need my fueling ready. This is for my friend and has no large budget for his project.
Staged injection is new to me so I hope many can help
Primary Injectors are 4x 550cc(high impedance) and currently on alternating 2 squirts on MS1( MS2 upgrade is also an option since i have the MS2 processor in stock)....when we swapped in our brandnew Bosch 1680cc with part number 0280150842 light blue tops with resistor pack,...as in the hopes for just using these set of injectors and no staging at all...... we cant tune it right, the engine runs really bad even with maintaining 11.5 AFR(jumping). So we reverted to all 4 550cc's and the engine runs good again
So now im planning to use staged injection...using the 550'c as primary and using the 1680cc's as secondary(will mount the 1680's under the intake manifold
My question is:
=Is there a hope of using only 4x1680cc's(no staged injection)? But Ive read they are bad injectors at idle for a 1800cc engine
=If going staged, how do i wire the 4x 550cc high impedance injectors? all four in parallel connection only to Bank1? and then select simultaneous injection, 1 squirt? will it not overload the transistor driver in megasquirt V2.2? Then the secondary 4 x 1680cc injectors with resistor pack also in parallel connection to bank 2 of megasquirt V2.2? will it also not overload the injector driver transistors in megasquirt V2.2?
Note: Im using a Miata CAS in wasted spark mode(no crank triggers)
Thanks in advance for your inputs
Staged injection is new to me so I hope many can help
Primary Injectors are 4x 550cc(high impedance) and currently on alternating 2 squirts on MS1( MS2 upgrade is also an option since i have the MS2 processor in stock)....when we swapped in our brandnew Bosch 1680cc with part number 0280150842 light blue tops with resistor pack,...as in the hopes for just using these set of injectors and no staging at all...... we cant tune it right, the engine runs really bad even with maintaining 11.5 AFR(jumping). So we reverted to all 4 550cc's and the engine runs good again
So now im planning to use staged injection...using the 550'c as primary and using the 1680cc's as secondary(will mount the 1680's under the intake manifold
My question is:
=Is there a hope of using only 4x1680cc's(no staged injection)? But Ive read they are bad injectors at idle for a 1800cc engine
=If going staged, how do i wire the 4x 550cc high impedance injectors? all four in parallel connection only to Bank1? and then select simultaneous injection, 1 squirt? will it not overload the transistor driver in megasquirt V2.2? Then the secondary 4 x 1680cc injectors with resistor pack also in parallel connection to bank 2 of megasquirt V2.2? will it also not overload the injector driver transistors in megasquirt V2.2?
Note: Im using a Miata CAS in wasted spark mode(no crank triggers)
Thanks in advance for your inputs
Seriously? For starters upgrade to an MS2 V3.0 at an absolute minimum. That way you'll have PWM current limiting available for the Low-Zs. Better still use an MS3/3X and use the 3X drivers for primaries and the mainboard drivers for secondaries.