Could someone tell me the difference between high impedance/saturated injectors and low impedance/peak and hold injectors.
Which injectors would better suit F.I or are there specific circumstances in which either are used.
Thanks

 

bmp

 

Major difference is OHM's. Saturated injectors are a higher ohms (resistance) peak/hold are lower ohm(resistance) Generally Peak/hold were used in OBD0 Civic/Integras (with the exception of DX's that I'm not sure of, they used 2 wires and never cared to figure them out )and upto OBD1 Preludes/Accords using a injector resistor box, then OBD1/2AB Civic/Integras and OBD2AB Accords/Preludes used saturated injectors without the resistor box. The ECU needs higher resistance to operate the injectors correctly and not distroy the ECU. If your using peak/hold for any Honda ECU you will need a resistor box or inline resistors, if you using Saturated you don't need the resistor box. For ease of install get the injectors your car orginally used but if price is the major factor get what you can and work around it. Its not a major job just moving around some wires or connecting some.


Modified by zCivic at 8:15 AM 8/4/2006

 

Just a more technical response to their differance:

Larger Injectors have larger springs inside to hold the armature closed under higher fuel flow. In order for the injector to open the injector needs a higher current (thus lower resistance) to overcome the force of the spring and open the armature.

On the other hand, smaller injectors have smaller springs, and a smaller armature. The force produced by the spring is less than that of a larger injector and the weight of the armature is less than that of the larger injector. So its easy to see why smaller injectors use higher resistance since they dont need as much current to operate them.

Most low resistance injectors are designed to be Peak and Hold. Peak and hold simply supplys a high (peak) current to open the armature quickly within the injector then reduces that current to just hold the armature open.


Commonly for FI you are going to want to go with high flow, low resistance injectors (Peak and Hold). If you are dealing with a relatively low output FI setup, you should be able to get by with some DSM 450s. They are a dime a dozen (prices float around $50).



Modified by Jeterkm02 at 11:59 PM 8/3/2006