Spark Plug Information - Dodge SRT Forum
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post #1 of 22 (permalink) Old 09-21-2010, 04:21 PM Thread Starter
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Spark Plug Information

Here is some good information compiled by myself and Brandon from NGK. Now these are all NGK plugs. I use NGK for two reasons:

1) They make exceptional product and are OEM manufacturers on many platforms.

2) Their tech support ( I always deal with Brandon.) is simply amazing. They are fairly fast for a company of their size and are very knowledgeable. Polite as well.

Stock or near stock:

NGK#4306

This is a projected tip #5 heat range plug. This is the plug I would recommend for stock replacement as well as cars with minor mods such as intake/exhaust. If you have increased boost or are ready for nitrous see below.

Higher than stock boost OR nitrous:

NGK#2315

This is the same projected tip plug as above, but in a #6 heat range. If you are going to hit the car with nitrous less than a 75 shot OR increase boost, then you need to go to this heat range plug.

Higher than stock boost AND nitrous:

NGK#5107

Again same plug, two heat ranges colder than stock, resulting in a #7 heat range. This is plug I recommend for cars with high psi and nitrous. Now if you have stock psi but a fairly large nitrous shot, I would also recommend going to this plug. I think at 75 shot its optional but recommend, after that I would call it mandatory.

Little general plug tech

Plug styles

There are projected and non-projected type plugs. It means just what it says, the electrode of the plug either protrudes from the end of the threads, or it does not. Generally, non-projected tip are preferred in nitrous applications. However, These are not available for the srt-4. While I would prefer them, its fine to run on the plugs at hand as long as the tune is safe.

Heat ranges:

In performance applications it is at times needed to go to a "colder" spark plug. This is in reference to the amount of heat a spark plug will release into the cylinder head. It is in no way a reference to the amount of spark or the temperature of the spark. This is a common misconception tho.


I know some read a previous post I made on spark plug and choosing them for you vehicle. This is simply a cleaner more organized format. The information is the same.

Last edited by NitrousExpress; 09-21-2010 at 04:23 PM.
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post #2 of 22 (permalink) Old 09-21-2010, 08:00 PM
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This should be stickied...
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post #3 of 22 (permalink) Old 09-22-2010, 05:45 PM
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Good info. . . .
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post #4 of 22 (permalink) Old 09-26-2010, 11:07 AM
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how about some plug gapping info if possible, i think im getting some spark blow out right, now and it would be extremely helpful thanks.
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post #5 of 22 (permalink) Old 09-27-2010, 02:19 PM Thread Starter
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Originally Posted by s ar tee 4 View Post
how about some plug gapping info if possible, i think im getting some spark blow out right, now and it would be extremely helpful thanks.
Good Idea sir. Ill get with Brandon again. Ill make sure that we have the gaps as the come in the box and what we recommend on them. Thanks for the input.
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post #6 of 22 (permalink) Old 09-27-2010, 04:51 PM
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Originally Posted by NitrousExpress View Post
Good Idea sir. Ill get with Brandon again. Ill make sure that we have the gaps as the come in the box and what we recommend on them. Thanks for the input.
thanks alot man i appreciate it.
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post #7 of 22 (permalink) Old 09-27-2010, 06:45 PM
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i guess i need me some NGK#2315

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post #8 of 22 (permalink) Old 10-06-2010, 11:26 AM
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i just picked up some NGK 4306 plugs this week. Will they work with granetelli or MSD spark plug wires? Modern performance's website says that they may not fit with the 4306 or other weird plugs.
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post #9 of 22 (permalink) Old 10-06-2010, 01:38 PM Thread Starter
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Originally Posted by biggwilliamz View Post
i just picked up some NGK 4306 plugs this week. Will they work with granetelli or MSD spark plug wires? Modern performance's website says that they may not fit with the 4306 or other weird plugs.
Called up modern performance. They sell the combination all the time. They are a touch shorter but still work fine with the ngk plug.
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post #10 of 22 (permalink) Old 08-11-2011, 07:21 AM
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Not to bump an old thread, but would have been good to post gap adjustments (if any) in relation to spark plug.

This space is intended to be left blank until further notice.
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post #11 of 22 (permalink) Old 08-11-2011, 11:29 AM
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good thread to bring back up tho. about to replace mine so this is very good to know and also would like to know gap adjustments if need be?
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post #12 of 22 (permalink) Old 08-24-2011, 01:30 AM
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what would you consider higher than stock boost levels?

I'm currently running 17psi with s2 and stock plugs, would it benefit me to change heat ranges or stay the same as stock since it's not much more boost
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post #13 of 22 (permalink) Old 08-24-2011, 09:18 PM
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I'm running 23 psi and e85 I'm still on the 4306! I'm about to go with a 50 shot I'm going to lower the boost to 20 tho and retard time my 3 degrees! What's a good timing to be at with e85 and nitrous?

Maybe I should be using the 5107???

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post #14 of 22 (permalink) Old 08-26-2011, 01:48 AM
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bump for appropriate Gap info!
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post #15 of 22 (permalink) Old 09-16-2011, 10:47 PM
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Quote:
Originally Posted by underSRTarmor View Post
I'm running 23 psi and e85 I'm still on the 4306! I'm about to go with a 50 shot I'm going to lower the boost to 20 tho and retard time my 3 degrees! What's a good timing to be at with e85 and nitrous?

Maybe I should be using the 5107???
this!! want to know this aswell, im still using 4306 with nos and high boost.
5107s are 8.89 each, 4306s are 12 dollars all four.
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