Plug Replacement
#1
Plug Replacement
I am looking into replacing my STI JDM 2005 plugs with Denso Iridium. Can any one tell me the OEM plug and the Denso replacement number. My engine is the EJ207. I was told the IKH22 would be the preferred choice as my engine is modded and running around 20 lbs boost.
Thanks for the input
Thanks for the input
#2
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Iridium plugs are, allegedly, really good conductors, so the electrode can be made smaller/thinner, therefore exposing the spark more openly to the air-fuel mixture, for more complete ignition/combustion
That said, I'd stick with the widely used NGK PFR7B gapped to 0.65mm.
That said, I'd stick with the widely used NGK PFR7B gapped to 0.65mm.
Last edited by joz8968; 08 December 2008 at 01:46 PM.
#3
Thanks jaz8968. I had Denso IK20 in my previous MY00 and they ran very well having to be changed every 30,000 km.
Is the NGK PFR7B the OEM for the JDM 2005 STi or for another model?
Is the NGK PFR7B the OEM for the JDM 2005 STi or for another model?
#4
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The '6' is the plug 'down' from the '7' i.e. it runs hotter than the 7. That's why, if you have a modded car, the colder 7 is a good choice, as it manages the higher cylinder heat/pressures better, and helps with keeping possible detonation at bay.
Last edited by joz8968; 08 December 2008 at 04:42 PM.
#5
I was thinking about upgrading to the iridium plugs. But them I heard they over sparked on hard acceleration, and under certain circumstances, caused the engine to shut down (fail safe) which would suck!!
Wondering if anyone had these plugs work 100% and what are the benefits, ie BHP?
Wondering if anyone had these plugs work 100% and what are the benefits, ie BHP?
#6
I am looking into replacing my STI JDM 2005 plugs with Denso Iridium. Can any one tell me the OEM plug and the Denso replacement number. My engine is the EJ207. I was told the IKH22 would be the preferred choice as my engine is modded and running around 20 lbs boost.
Thanks for the input
Thanks for the input
#7
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No massive benefit other than they last a bit longer. I don't think it's conductivity, it's that iridium is verra, verra hard and can be made smaller without the tip dropping off.
Just don't put those bloody 4 electrode things in. You might as well wrap tinfoil around the plug.
Final point - people stick expensive plugs in then go "Wow, I can feel the difference!". Yeah, you would have felt the same difference if you'd just put some OE ones in too though.
Have a nice day
Just don't put those bloody 4 electrode things in. You might as well wrap tinfoil around the plug.
Final point - people stick expensive plugs in then go "Wow, I can feel the difference!". Yeah, you would have felt the same difference if you'd just put some OE ones in too though.
Have a nice day
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#8
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Also a handy <ahem> tip is to make a mark on the ceramic insulation (using a black marker) the position that corresponds in line with the open side of the cathode/electrode. That way, then when you screw the plugs in, you can fine position them so that this open area is facing the inlet valves and centred between them. In theory, this should aid igniton of the A/F mixture (it certainly shouldn't make it worse lol).
Yeah, very much the Placebo effect lol.
Last edited by joz8968; 10 December 2008 at 10:05 AM.
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