NGK spark plugs - heat range consideration?

[Darren S]

So, it's my understanding that the spark plugs at heat range 6 are fine for a standard 182, range 7 for a modded/turbo or supercharged option and range 8 for a pure track car.

As they all appear to be the same price anyway, are there any gains in terms of smoother idle, smoother response by having a set of 7's over the standard 6's?

As my engine is non-standard, I was thinking of trying out a pack of the 7's instead?

Any feedback would be welcome.

Thanks.

 

[Matt Cup]

What do you mean by your engine is non standard? Is it boosted or n/a now? If it’s just a few bolt on mods then I’d just stay with the normal Renaultsport spec ngk spark plugs.

 

[JamesBryan]

Shouldn't be needed mate, stick with the standard 6's.

You'll probably get a poor burn with a colder plug and cause them to foul up.

 

[Darren S]

Shouldn't be needed mate, stick with the standard 6's.

You'll probably get a poor burn with a colder plug and cause them to foul up.

Standard 6's ordered - hopefully will be here to fit at the weekend, assuming the weather behaves!

 

[R3k1355]

It'll idle worse with colder plugs in, not immediately but they will soot up over time. There's no advantage to changing plug heat range when you don't need to.

Don't forget to check the plug gap as you're putting them in.

 

[Darren S]

Put them in today. Interestingly, they were 7's that came out and have obviously had new 6's going in.

Had a bit of spirited drive over here for about half-an-hour afterwards and it 'felt' smoother. Most likely a complete placebo effect or simply new plugs vs. four-year-old ones. But I'll see how I get on.

All the old plugs looked good with no obvious sooting or other signs of issues.