STR spark plugs:
#1
STR spark plugs:
Ok so I know a lot of you guys with STR's are running the NGK IFR5N10 spark plugs. I emailed NGK just to verify if this plug was a good choice for the supercharged engine. This plug is designed for the normally aspirated 4.2 V8 engine only, not the supercharged version! So I then asked if I ran this plug in a 1 degree colder version if it would be more suitable for the supercharged engine. And again, he said: "the plugs that we offer are only for use in the naturally aspirated engine. Unfortunately I cannot verify that lowering the heat range by only one will be appropriate for this application"
So now what???
So now what???
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MgkMkr (08-18-2014)
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The plugs were standard OEM equipment throughout type R production. Nobody has reported any problem with them.
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#8
I just run the ngk bkr5es-11 copper, better plug for performance just doesn't last as long.
Last edited by just rob; 03-26-2014 at 03:45 PM.
#9
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It's the other way around. Jag sets the spec, NGK produces a plug that meets it.
#10
New ones have been in for 6K miles and I can't tell the difference.
Maybe the guy just didn't know Jaguar use them. He'd no particular reason to know, though it would help a little in case people ask.
Last edited by JagV8; 03-26-2014 at 04:02 PM.
#11
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#13
That is amazing! The guy at NGK you emailed describes himself as a "Technical and Training Specialist". Yet, the NGK website says:
Laser Iridium® spark plugs provide superior ignitability and long service life. Smallest tip diameter available Iridium / Platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions
Best OEM Iridium spark plug available
Original Equipment Manufacturer approved design
You would do him a big favor by forwarding a copy of the JTIS specs that Norri provided.
Laser Iridium® spark plugs provide superior ignitability and long service life. Smallest tip diameter available Iridium / Platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions
Best OEM Iridium spark plug available
Original Equipment Manufacturer approved design
You would do him a big favor by forwarding a copy of the JTIS specs that Norri provided.
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Wuzupez (03-27-2014)
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There's no other magic to it. Unless your car is experiencing one of the problems above, there's nothing to gain by changing heat range.
#17
#18
I have a Nissan Sentra Spec-V and in the owners manual it gives 2 options for plugs. Regular temp and 1 stage colder. The 1 stage colder it says is for mostly long trips and highway driving. I also had a 2G turbo Eclipse with lots of mods that I ran 2 stage cooler plugs in. I feel a little safer running the 1 stage cooler plug. With that being said, my STR has a few mods as well and the only time I drive it is for long road trips! So again "FOR ME" I feel more comfy running the 1 stage cooler plug!
#19
Also, I think it's pretty peculiar that Mercedes Benz "supercharged" engines as well as Chrysler Crossfire "supercharged" engines run the IFR6D10 plugs factory in their cars. Yet Jaguar has the same plug IFR5N10 for their normally aspirated engine as well as supercharged engine.....
Again it's all personal preference and this is what I choose to run based on experience in my car!
Again it's all personal preference and this is what I choose to run based on experience in my car!
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Wuzupez (04-01-2014)