Spark Plugs Choice
 

What plugs are you guys running? Is there one better than the other? I'm still running the stock plugs now, even with my mods.

Thanks

NGK TR7IX gap 0.042

What is the benefit over stock?

None unless you have upped your boost. The higher an engines compression ratio the colder of a plug you will need. Increasing boost is the same as increasing the compression ratio.

Good read. http://www.pcmofnc.com/index.php/blo...ere-do-i-start

Thanks for the article...It was a good read!! :thanks:

That calculation seems to be a little off... Basically says stock should be heat range 7. From what NGK shows stock is heat range 6.

I currently have one step colder plugs from NGK (range 7) and by that websites calculations says I should be using a range 8.

I guess it is a good place to start, but just like he says in the text it isn't the bible.

Pretty much anyone with over stock boost is good with a 7 heat range. Gapping the plugs down to around .030 helps many cars with blow out issues including mine.

Ted, Would this affect my tune by changing from the stock plugs to TR7IX?

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.

Ted,

At what point, if any, is there a need/benefit to add upgraded electrical for the plugs, i.e. coils and wires? Any reason to upgrade to MSD or Granatelli parts?

Thanks

I've wondered this myself, especially about the coils.

MSD coils are junk and many tuners have issues with them. Stock GM is more than adequate so leave them stock.

I would say unless you are running crazy high boost levels and using exotic fuels the stock coils are just fine. The stock ones easily handle 18-19 pounds of boost on e85 or pump.

MSD coils are not junk, I have determined the problem is in the voltage supply to the coils.

Stock coils draw less than aftermarket coils.

Therefore installing aftermarket coils often overwhelms the voltage feed to the coils.

Many of the cars that have come through my shop with high power and spark blow out is easily fixed with a Wire upgrade to feed the coils now offered in a kit from MSD. http://www.summitracing.com/parts/msd-88867

To take it a step farther we install JMS Ignition voltage booster to feed the coils and we can run large gaps at high boost and make more power.

http://www.jmschip.com/sparkmax-igni...ltage-booster/

I upgrade the plugs in our 125 RWHP packages and above

I upgrade the wires when we add headers.

Ted.