ERIKC B41 Bosch injector adjusting shim B41 adjusting shim gasket Size 1.11-1.2 mm

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Injector FAQ

FAQ: How much flow can I get from low impedance vs. high impedance injectors?

ERIKC Answer:The latest injector technology has turned this area upside down in the last few years! Until recently you would see that most of our injectors flowing more than 500cc/min were low impedance injectors since the larger flow size injectors all came that way. We still sell low impedance injectors (650cc/min up to 1650 cc/min), but there are now high-z injectors, like our 900cc, 1100cc, and 2150cc units which outperform their older low-z counterparts quite signierikcantly. These new technology high-Z injectors display great linearity throughout the pulse range and have fantastic short pulse width repeatability which results in stock-like idle and superior part throttle characteristics from these large injectors. That does not mean that you have to run high impedance injectors if you need flow over 900cc/min. There are still lots of customers whose cars were equipped with low impedance injectors as OEM equipment and who are able to use injectors - like our BlueMAX line of 1250cc/min through 1650cc/min injectors - which provide great drivability at more affordable pricing.

FAQ: What are the differences between low impedance/peak & hold and high impedance/saturated injectors?

ERIKC Answer:The older fat body style low impedance injectors (1.5 to 4.0 Ohm) used to have faster open and close times due to the type of electrical signal pattern emitted by an ECU equipped with proper P&H signal transmitters. This “Peak and Hold” injector signal typically uses a high (4 amp) initial current to open the injector, and which reduces to a lower (1 amp) current to keep the injector open until the pulse ends.