This car is full with surprises, I asked the dealer what plugs the Stinger used when they replaced them in my friends car and they said NGK, and I was like it should be Denso. I had to check my car and sure enough when I removed it, it was an NGK Iridium. These are the plugs that came with the car. The Reddish colouring is normal, just the additives in the unleaded fuel.
SIL ZFR7A-9G
S : Special Square Platinum Chip in Ground Electrode
I : Iridium Centre Electrode and Platinum Ground
L : Extra Long Reach Thread
Z : Extended Gap (Extra Projection)
F : Thread 14mm, Pitch 1.25mm, Reach 19mm, Hex 16mm
R : Resistor
7 : Heat Range
A : Design Series
9 : 0.036 Gap
G : Copper Core Ground Electrode
Not too sure about the G code, I believe it is just a special addition to the lettering for OEM plugs.
Anywho, this is a 7 heat range Iridium plug which means KIA means business when they put it. I think just regapping too .028 should do the trick for up to 450+ whp.
SIL ZFR7A-9G
S : Special Square Platinum Chip in Ground Electrode
I : Iridium Centre Electrode and Platinum Ground
L : Extra Long Reach Thread
Z : Extended Gap (Extra Projection)
F : Thread 14mm, Pitch 1.25mm, Reach 19mm, Hex 16mm
R : Resistor
7 : Heat Range
A : Design Series
9 : 0.036 Gap
G : Copper Core Ground Electrode
Not too sure about the G code, I believe it is just a special addition to the lettering for OEM plugs.
Anywho, this is a 7 heat range Iridium plug which means KIA means business when they put it. I think just regapping too .028 should do the trick for up to 450+ whp.
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