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Old 09-27-2013, 02:42 PM   #1
PWRHSEZL1
 
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Spark Plug Type and gap?

I have a 2013 ZL1 forged motor with cam, upper pulley, headers, and plenty of other goodies. What I am wondering is what plug and gap most tuners are running in setups similar to this! My compression is 10.1:1 and 12 AFR from what I can gather a TR7IX in NGK is perfect as far as heat range but I am getting quite a bit of misfire at higher RPMS with a gap of .035. Any tips or recommendations are very much appreciated!
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Old 09-27-2013, 07:48 PM   #2
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Quote:
Originally Posted by PWRHSEZL1 View Post
I have a 2013 ZL1 forged motor with cam, upper pulley, headers, and plenty of other goodies. What I am wondering is what plug and gap most tuners are running in setups similar to this! My compression is 10.1:1 and 12 AFR from what I can gather a TR7IX in NGK is perfect as far as heat range but I am getting quite a bit of misfire at higher RPMS with a gap of .035. Any tips or recommendations are very much appreciated!
Since none of the guys that really know are jumping in here I will mention that I was having some spark plug problems at one time and changed out plugs based on my tuners recommendation. I'll see if I can figure out which plug I'm using because I haven't had a problem since.
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Old 09-27-2013, 07:52 PM   #3
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Originally Posted by jessrayo View Post
Since none of the guys that really know are jumping in here I will mention that I was having some spark plug problems at one time and changed out plugs based on my tuners recommendation. I'll see if I can figure out which plug I'm using because I haven't had a problem since.
Yea I was hoping some of the big guns would give me their 2 cents! Thanks in advance!
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Old 09-27-2013, 07:53 PM   #4
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Factory plug at .042

Before you knock it try it. :-)


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Old 09-27-2013, 07:59 PM   #5
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Factory plug at .042

Before you knock it try it. :-)


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Thanks for the tip but I don't believe that going with a larger gap is going to cure it! Also the stock plug is to high in the heat range! Thanks for the idea though!
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Old 09-27-2013, 08:06 PM   #6
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Thanks for the tip but I don't believe that going with a larger gap is going to cure it! Also the stock plug is to high in the heat range! Thanks for the idea though!
Running over 600 RWHP with a single front mount turbo on the factory ZL1/ZR1 plug.

You might be surprised.

Who did your tune?


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Old 09-27-2013, 08:15 PM   #7
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Running over 600 RWHP with a single front mount turbo on the factory ZL1/ZR1 plug.

You might be surprised.

Who did your tune?


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Nice! I'm not saying it won't work, this is a viable option! It was built and tuned by Clint at American Intense Racing! He installed a BR7EF but I would rather run iridium for the longevity! How much boost are you running?

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Old 09-27-2013, 09:22 PM   #8
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Nice! I'm not saying it won't work, this is a viable option! It was built and tuned by Clint at American Intense Racing! He installed a BR7EF but I would rather run iridium for the longevity! How much boost are you running?
Low boot is 10.5 high is around 12.

There is a topic going about this just don't know how to link to in with my iPad.




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Old 09-27-2013, 09:33 PM   #9
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Low boot is 10.5 high is around 12.

There is a topic going about this just don't know how to link to in with my iPad.


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Ok. I'm only running 9 lbs of boost. This is a very controversial topic from what I understand. When I searched the forum I couldn't really find anything!
I do know that if my stock plugs would've been the correct heat range then my tuner would've left them in, or Atleast I would think so! Are you running a fully built motor? What compression?
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Old 09-27-2013, 10:04 PM   #10
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Ok. I'm only running 9 lbs of boost. This is a very controversial topic from what I understand. When I searched the forum I couldn't really find anything!
I do know that if my stock plugs would've been the correct heat range then my tuner would've left them in, or Atleast I would think so! Are you running a fully built motor? What compression?
Top end

9:4:1


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Old 09-27-2013, 11:56 PM   #11
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Top end

9:4:1


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As I have a built forged motor complete with 10.1:1 compression! With the combination of my compression and boost I have been advised from tuners and even NGK tech that a step colder than stock plug is recommended!
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Old 09-28-2013, 06:54 AM   #12
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I am more or less looking to find out if there is a different brand of plug that others with built motors are using as well as what gap they are set too! Thanks again for any info on this matter!
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Old 09-28-2013, 05:02 PM   #13
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I'm running the same TR7IX that you are. I know that generally they say you should reduce the gap .005 for about every additional 50 HP. I don't know what Andy was gapping mine at. Next time I talk to him I will try to fink out. Our motors seem very close. My compression is like 9.9 or 10.0, boosted slightly over stock.
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2013 ZL1 -ADM - 427 LSX 6 bolt, O-ringed block built by LME. LSA blower, twin PT6466 turbos. RPM custom manual trans, RPS Quad carbon clutch, 9" Hendrix rear diff & axles. ADM/squash fuel system, ADM trunk intercooler reservoir & EMP pump, Ron Davis S/C heat ex, and radiator, Spal fans, AGP air to air, turbo plumbing. LPE oil cooler, rear bushing upgrade, roll bar...etc. rwhp TBD... 200.4mph, best Texas mile to date.
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Old 09-28-2013, 05:42 PM   #14
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Originally Posted by jessrayo View Post
I'm running the same TR7IX that you are. I know that generally they say you should reduce the gap .005 for about every additional 50 HP. I don't know what Andy was gapping mine at. Next time I talk to him I will try to fink out. Our motors seem very close. My compression is like 9.9 or 10.0, boosted slightly over stock.
Ok thanks. I'm going to run the gap down to .030 and see how it does and go from there! You're correct it does seem that our motors are very close to the same general build! What kind of numbers are you putting down?
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