spark plugs??? - Cherokee SRT8 Forum
WK1 General Performance Discussion If you are planning on modifying your Jeep Grand Cherokee SRT8 with a performance enhancing modification, this is the section to post about it.

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post #1 of 15 (permalink) Old 06-20-2007, 05:08 PM Thread Starter
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spark plugs???

anyone with n2o on the srt8 gc change plugs for a colder or lower the gap?
going to norwalk(summit) raceway this friday morning for a track rental and
want to up the jets.
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post #2 of 15 (permalink) Old 06-20-2007, 05:09 PM
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About the only thing I agree with the SRT8 engineers is this, changing plugs will have no signifigant gain in your SRT8.

But good luck and let us know if you feel a difference, I pulled mine at 7000 miles and they looked brand new.

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post #3 of 15 (permalink) Old 06-20-2007, 05:12 PM Thread Starter
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not looking for more power, just looking for a safer combustion chambercooler cylinder temps with a bigger nitrous shot.
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post #4 of 15 (permalink) Old 06-20-2007, 05:24 PM
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Remember the Split-Fire... LMAO... what were we thinking back then!
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post #5 of 15 (permalink) Old 06-20-2007, 05:38 PM
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Quote:
Originally Posted by sprsonic
not looking for more power, just looking for a safer combustion chambercooler cylinder temps with a bigger nitrous shot.

With nitrous you will need new plugs, no doubt.
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post #6 of 15 (permalink) Old 06-20-2007, 06:35 PM
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I run the 5.7L copper NGK plugs in my SRT-8 on a 125 shot.
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post #7 of 15 (permalink) Old 06-20-2007, 06:37 PM
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I put sone new mats in my jeep.Gave me about 30hp
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post #8 of 15 (permalink) Old 06-20-2007, 06:52 PM
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Check this out, several have used the #2315 NGK IX with success!--Search function is always helpful!!!! GC
does NGK make an iridium plug?

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post #9 of 15 (permalink) Old 06-20-2007, 07:21 PM Thread Starter
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thanks everyone
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post #10 of 15 (permalink) Old 06-20-2007, 07:21 PM
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You do not want to use platinum plugs they are not good with n2o. These motors at wot only see 17 to 20 degrees of timming, so you dont need a colder plug if you stay under a 100 shot just gap them to 36-38 thou. If you go over that say a 125 shot then you will want to pull the plugs and look for signs of over heating (ground strap starting to bend heat discoloring) then go one step colder, but I dont think it will be a problem. Also dont waste your money on iriduium plugs. copper plugs are cheap and very replaceable. I have the iridium plugs and the car has a hard time starting.

Last edited by runnin 9s; 06-20-2007 at 07:27 PM.
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