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Old 09-27-2013, 02:42 PM   #1
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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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Old 09-28-2013, 05:42 PM   #14
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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.
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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Old 09-28-2013, 07:56 PM   #15
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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?
Unfortunately the last motor is gone... Still building the next one, last dyno'd 807 hp and 820 trq at the wheels. I blew a head gasket and put water in the bottom of the block... locked up the motor on the race track. I'm trying to rebuild with a 6 bolt head... having trouble getting a good block set-up for 6 bolt head.
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Old 09-28-2013, 08:32 PM   #16
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Wow! That sucks man. I know I would lose my mind if I was to blow my motor! Then again things happen when you wanna go as fast as we do! I am setting a 635 WHP and 615 TQ for now! I have lots more work to do later on down the road. I am hoping to get moved back down to Tx soon and take to Andy!
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Old 09-29-2013, 01:27 PM   #17
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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!
My tuner used a gap of .035 but went regular Autolite copper plugs instead of the iridium TR7IX plugs I brought to him. He said in his experience (over 25 yrs tuning) he found that with boosted cars the iridium tips actually lose power over continuous use. Most people would never know this because you throw the car on the dyno it makes great power and then you take it off satisfied with the result. But he learned this after doing a few big boosted builds and doing repeated dyno runs that the power was dropping on the car for no reason and when he swapped the spark plugs from iridium to copper and did a few runs back to back the power stayed consistent. The tiny iridium tip blows out way too easily hence the power loss. Yes Iridium plugs will last longer but since copper plugs are much cheaper it's a wash anyway. Search the net and you'll find many other tuners who agree that iridium plugs and FI aren't the best combo. BTW: I'm running about 13PSI boost
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Old 09-29-2013, 02:23 PM   #18
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My tuner used a gap of .035 but went regular Autolite copper plugs instead of the iridium TR7IX plugs I brought to him. He said in his experience (over 25 yrs tuning) he found that with boosted cars the iridium tips actually lose power over continuous use. Most people would never know this because you throw the car on the dyno it makes great power and then you take it off satisfied with the result. But he learned this after doing a few big boosted builds and doing repeated dyno runs that the power was dropping on the car for no reason and when he swapped the spark plugs from iridium to copper and did a few runs back to back the power stayed consistent. The tiny iridium tip blows out way too easily hence the power loss. Yes Iridium plugs will last longer but since copper plugs are much cheaper it's a wash anyway. Search the net and you'll find many other tuners who agree that iridium plugs and FI aren't the best combo. BTW: I'm running about 13PSI boost
Very good information, thanks for the tips.
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Old 10-02-2013, 03:47 PM   #19
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So I pulled the plugs last night and found one that had some cracks in the porcelin. I replaced it and reduced the gap to .030 on all and now she's running like a champ! I also added the 8.5mm MSD wires and oh what a difference in response and smoothness! Thanks to all for the recommendations and tips, very much appreciated!

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