Cadillac CTS-V - Spark Plug Question (Newbie)
08-13-2012, 12:05 AM
Hey guys sorry if this has been answered in a previous thread. I am a newbie around here. I just picked up an '04 LS6 CTSV and wanted to switch out the spark plugs. I've has great experiences with NGK plugs on previous vehicles, but they have all been imports. What spark plugs do you guys think are the best? I am currently bone stock all around. Thanks in advance.
08-13-2012, 12:13 AM
N/A... Ngk tr55ix
100 shot... NGK TR6
150 shot NGK BR7EF
Just for others that may need that info.
08-13-2012, 04:33 AM
I second the NGK TR55ix.
08-13-2012, 06:49 AM
TR55s come gapped wider than stock. TR5s are closer to the 0.040 gap we need for the V1. You will still need to gap them because they often come gapped a little wider or narrower from the factory.
08-13-2012, 10:03 AM
Just gap the TR55IX. Not a big deal and it's an iridium plug. Little more expensive but better quality than the standard TR5.
08-13-2012, 10:16 AM
The TR5s are available in iridium. TR5-IX from marylandspeed (http://marylandspeed.com/ngk-iridium-ix-tr5ix-spark-plugs-040-gap-gm-lsx-v8-applications-set-of-8-ngk-7397-8-p-1618.html)
You don't want to gap a plug too much beyond how it comes from the factory because you will cause a big bend that will result in a spark with direction of travel that's out of spec.
08-13-2012, 10:53 AM
Oh ok well of that's the case... Maybe you're right. I knew both were a good plug for N/A applications but I was told the TR55IX was slightly better. How true that is I don't know but you can't go wrong either way.
08-13-2012, 11:24 AM
Thanks for the info!!
08-13-2012, 11:34 AM
Ya, they're identical except for the factory gapping. I think a lot of LS performance guys have used TR55s for years, so just have them piled up in their storerooms and plug them in when needed. But really if you're ordering, the TR5 is a better choice for our engines. I nerded out on plugs a couple weeks ago, now I know way too much about plugs and gaps.
08-13-2012, 12:36 PM
Good to know. Glad u posted. Learn something everyday. Lol
08-13-2012, 12:59 PM
08-13-2012, 05:59 PM
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