Fuel Injector Resistor question????

[Milly]

Hey everyone, i've done research and i think this is what it means but i am just making sure..

I have FIC 680cc injectors which are low inpedence and i got an Enthalpy tune which is for high inpedence injectors..


My car was tuned with a aem fic and has 10ohm 10w resistors on each injector, i took them off and in order for my car to work correctly i will need to put 6.8ohm 10watt resistors in right?


Thanks!

[Croustibat]

You need "high impedance" on each injector, which means around 15ohms total. The less resistance, the higher the amps.

higher amps pro : more responsive injectors.

higher amps cons: everything heats more, that means your injectors, your resistor pack, and the power transistors driving your injectors (usually in your ECU). To the point they can burn so take care of what you do here.

The tune is not for high or low impedence injectors, your injector driver defines that. Tune has nothing to do with it. When using a saturated driver you need high impedence, when using peak and hold you need low impedence. Our cars mostly use a saturated driver (because cheaper), which can cause problems with big injectors, as the initial current is sometimes too low to open the injector fast enough, creating a big lean situation when the ECU goes from sequential to batch mode ( it fires twice per cycle in batch mode, and with big injectors the driver has trouble coping with that). When that phenomenon happens, lower the resistors value.

I dont know why you want to go from 10ohms to 6.8ohms resistor pack though. If your car was tuned with 10ohms resistor pack, then use a 10ohms resistor pack.

[Milly]

Well Martin @ enthalpy told me the ones I have now are 10ohms and I need 6.8ohm resistors for it to work lol.

And I read a couple things on 6.8 ohm resistors making it work.

[Croustibat]

My post was merely informative, to explain you the role of these resistors and help you make your choice.

It looks like you had already done that choice before posting though, so do what you were told and what you have read ... This is no black magic. This is electricity. Amps will go up a little bit, thats all, nothing to really worry about.