SR 480cc injector impedance? How to properly test for it? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Zen S14 · 10-20-2008, 12:57 PM

I need to figure out if my 480cc injectors from the S15 is high impedance (red sidefeed type) I would also like to know where to test on the injector to get the proper resistance using a ohm meter.

Everywhere I've read online seems to indicate the sidefeed S15 SR injectors should be high impedance.

Thanks in advance.

MangoDorifto · 10-20-2008, 04:10 PM

S15 480cc Injectors are high impedance. They'll be a direct drop-in, no need for anything else but a good tune afterward.

To test the injectors, just touch the red and black probes on your multimeter to the two pins on the injector itself. The injector doesn't need to be connected to anything for you to test resistance. Your stock 370cc injectors should have the same resistance as your new 480cc.

Zen S14 · 10-20-2008, 08:04 PM

Thanks for the info. I did test it again tonight and it was 11ohms resistance. High impedance means with the JWT ECU programmed for the injectors I am all set.

10-20-2008, 12:57 PM	#1
Zen S14 Zilvia Member Join Date: Mar 2003 Location: Philadelphia USA Age: 44 Posts: 240 Trader Rating: (13) Feedback Score: 13 reviews	SR 480cc injector impedance? How to properly test for it? I need to figure out if my 480cc injectors from the S15 is high impedance (red sidefeed type) I would also like to know where to test on the injector to get the proper resistance using a ohm meter. Everywhere I've read online seems to indicate the sidefeed S15 SR injectors should be high impedance. Thanks in advance.

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10-20-2008, 04:10 PM	#2
MangoDorifto Leaky Injector Join Date: Oct 2005 Location: Oregon Posts: 113 Trader Rating: (8) Feedback Score: 8 reviews	S15 480cc Injectors are high impedance. They'll be a direct drop-in, no need for anything else but a good tune afterward. To test the injectors, just touch the red and black probes on your multimeter to the two pins on the injector itself. The injector doesn't need to be connected to anything for you to test resistance. Your stock 370cc injectors should have the same resistance as your new 480cc.

10-20-2008, 08:04 PM	#3
Zen S14 Zilvia Member Join Date: Mar 2003 Location: Philadelphia USA Age: 44 Posts: 240 Trader Rating: (13) Feedback Score: 13 reviews	Thanks for the info. I did test it again tonight and it was 11ohms resistance. High impedance means with the JWT ECU programmed for the injectors I am all set.