Driver box vs. Inline Resistors
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Driver box vs. Inline Resistors I am going to be using either 96 or 160lb injectors (low impedence) for E85. I am using the factory pcm and wiring harness (2003 suburban 5.3) I was told that I could just put in some inline resistors for about $50 instead of messing with a driver box. Anyone have any info on this or could push me in the correct direction. I did a search but was not successful. This car will be street driven and raced hard on the weekends. It will be run on E85 and no intercooler.
Resistors will not make a low impedence injector work properly.
This is a way to keep from blowing out the PCM drivers, but it will not make a low impedence injector work like it is meant to.
Buy either the proper impedence converter or buy high impedence injectors.
This is a way to keep from blowing out the PCM drivers, but it will not make a low impedence injector work like it is meant to.
Buy either the proper impedence converter or buy high impedence injectors.
Thread Starter
TECH Fanatic
Joined: Oct 2011
Posts: 1,425
Likes: 0
the resistors will work on a budget setup. the megasquirt guys, who are typically very intelligent, have used them with little downside.
if you are going to be spending the buck on a driver box and harness, then you should put
the holley efi option back on the table, because it might save you money in the long run.
also put a megasquirt 2/msd 6010 option back on the table because it also will run your low z injectors.
if you go megasquirt, I have a harness that i will just give you, to help with the cost and speed of installation
if you are going to be spending the buck on a driver box and harness, then you should put
the holley efi option back on the table, because it might save you money in the long run.
also put a megasquirt 2/msd 6010 option back on the table because it also will run your low z injectors.
if you go megasquirt, I have a harness that i will just give you, to help with the cost and speed of installation
Resistors will not make a low impedence injector work properly.
This is a way to keep from blowing out the PCM drivers, but it will not make a low impedence injector work like it is meant to.
Buy either the proper impedence converter or buy high impedence injectors.
This is a way to keep from blowing out the PCM drivers, but it will not make a low impedence injector work like it is meant to.
Buy either the proper impedence converter or buy high impedence injectors.
im sure they work fine.
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As was stated, putting resistors inline will only keep the injector from burning out the injector drivers in the PCM. If you want low impedance injectors to work on a high impedance ECU/PCM, you need an injector driver box, or a peak an hold driver.
A peak and hold driver box essentially hits the injector with a burst of voltage really quick to pop the injectors pintle off it's seat, then it reduces the voltage to keep it held open for the commanded amount of time. This works very well in idling situations when running very large injectors that have a hard time pulsing very low pulse widths. This is also something an inline resistor cannot do. It also enables you to run an low impedance injector on a PCM designed for a high impedance injector.
A peak and hold driver box essentially hits the injector with a burst of voltage really quick to pop the injectors pintle off it's seat, then it reduces the voltage to keep it held open for the commanded amount of time. This works very well in idling situations when running very large injectors that have a hard time pulsing very low pulse widths. This is also something an inline resistor cannot do. It also enables you to run an low impedance injector on a PCM designed for a high impedance injector.
Last edited by SATAN; Dec 14, 2011 at 11:30 PM.
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Verdad Gallardo High impedance injectors - dead time = 0.8-1.0 ms
Low impedance injectors with resistors - dead time = 0.8-0.9 ms
Low impedance injectors with external peak/hold - dead time = 0.6-0.8 ms
http://www.msextra.com/doc/ms3/fuel.html
adding resistors to low impedance injectors will cause them to open and close like high impedance injectors, and have close to the same dead time.
we seen high z injectors now in the 160-200 lb that are tunable for idle, so it is entirely feasible to use low z injectors with resistors if one does not mind adding a little dead time
Low impedance injectors with resistors - dead time = 0.8-0.9 ms
Low impedance injectors with external peak/hold - dead time = 0.6-0.8 ms
http://www.msextra.com/doc/ms3/fuel.html
adding resistors to low impedance injectors will cause them to open and close like high impedance injectors, and have close to the same dead time.
we seen high z injectors now in the 160-200 lb that are tunable for idle, so it is entirely feasible to use low z injectors with resistors if one does not mind adding a little dead time
