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are high impedance or Low impedance fuel injectors better to use for turbo applications??

TunerToys

Basically, You need to match the impedance to your ECU. (Low impedance injectors were originally used by Honda for their performance applications, but now the difference is so minor, that matching your ECU is the surest method.)

Here is some additional information...

It's not about flow dictating impedance. Both high and low impedance injectors can flow just about any volume of fuel. For example, you can get 660cc injectors in either high or low impedances. The two things are unrelated for the most part. This allows you to match the impedance of the injectors to the ecu that you are using, be it a factory, add-on, or standalone.
Here is a partial quote from another thread we posted in...

...Some basic info
- Low Impedance = 2-4Ohms = Peak And Hold
- High Impedance = 10-12 Ohms = Saturated

- OBD0 Honda Civics have both low and high impedance injectors in MPFI (1988 - 1991) Most often, Si models have low impedance, and other models have high impedance. (Both low and high impedance injectors are available for all models, up to 1200cc flow rates.)

- OBD1 Honda Civics have mostly high impedance injectors with a plug that matches OBD0 injectors, no swapping of plugs needed. Resistors will be needed if switch to low impedance injectors. (There is no reason to switch to low impedance injectors, since high impedance injectors are avaialble, up to 1200cc.)

- OBD2 Hondas have high impedance injectors, with a plug that must be swapped for aftermarket injectors. Also, resistors must be used, if you are switching to low impedance injectors. (There is no reason to switch to low impedance injectors, since high impedance injectors are avaialble, up to 1200cc.)

Checking existing injector impedance is as easy as disconnecting the plug, and measuring across the terminals in the injector connector. Use the lowest resistance setting of your meter, normally 300 or 200 Ohm range. Polarity will not matter.

Use this link to see some directions we have published for our customers looking to buy CorrectInjects. http://stores.ebay.com/Tuner-T....html

So for your guy running high impedance injectors, and resistors too... He is probably not seeing the best possible performance out of the car. The added resistance will slow down the operation of the injector, since it is only getting a small amount of current instead of the full amount that it should.

Sometimes there is confusion about injectors vs. impedance vs. type. When all is said and done, there should be 12-14 ohms between the ecu and chassis ground on a high impedance system. If this is acomplished with only a saturated injector(12-14 ohms), or a peak and hold injector (2-4 ohms) combined with a resistor (10 ohms), you're good. It is always best to measure everything with a meter, and make sure you have the correct final resistance. You can seldom tell the impedance of an injector by just looking at it.

Hope that helps...

Craig

stealthmode62

Craig, you're a pimp.

88crxhfb16

thanks