Spark Plugs Choice

[97ChameleonTA]

Originally Posted by cybercoaster

I am going to replace the spark plugs. Looking at the recommendations, looking at the NGK TR7IX 3690. But all the web sites say DOES NOT FIT for my 2012 ZL1. Is that just incorrect on the web sites? so the DO in fact fit?

The site says they don't fit because they aren't a direct factory replacement. They are one heat range colder than the factory plugs which is what you want with your mods.

[cybercoaster]

thanks all

[97ChameleonTA]

Sorry, I must have been looking at someone else's mod list when I made my previous post. With your current setup you want to go with a 3689 TR6IX until you add more boost.

[cybercoaster]

Interesting. So the TR7IX would cause issues until more boost?

[97ChameleonTA]

Your idle quality might suffer a little bit and colder plugs are more prone to fowling. Since I doubt you've got much oil in the cylinders, other than the idle, you probably wouldn't notice the difference.

[Deez-zl1]

I need to get these plugs installed soon. I hav a 2.55 upper, long tubes w full exhaust, rotofab and a texas speed blower cam and springs
S. I am still running the stock TR6 plugs.
Should i hav this car retuned after the plug change ?

[ram360]

Originally Posted by JANNETTYRACING

If you having spark blow out issues on these cars something is wrong with the electrical or ignition system.

We can run gap of 0.042 at over 850 RWHP.



No sir no affect on the tune.

Ted.

So do you just run a 0.042 gap on the majority of the pullied zl1s you tune as a standard or does it change depending on the application?

[JANNETTYRACING]

Originally Posted by ram360

So do you just run a 0.042 gap on the majority of the pullied zl1s you tune as a standard or does it change depending on the application?

Pretty much, the larger the gap you can run the better the car runs all around.

0.042 seems to work best for all driving situation.

Of coarse as you go past 850 you may need to start closing the gap some.

At 1300 HP we run 0.020-0.025

[ram360]

Originally Posted by JANNETTYRACING

Pretty much, the larger the gap you can run the better the car runs all around.

0.042 seems to work best for all driving situation.

Of coarse as you go past 850 you may need to start closing the gap some.

At 1300 HP we run 0.020-0.025

Thank you. I appreciate the explanation.