Long Term Spark Plug Thoughts

[MikeyR44]

Ruths okay for 10k miles on an is38 GTI?

 

[Diggs24]

yes

 

[El_bigote_AJ]

Opinions on Ruths vs Brisk?

both good

Yeah my car runs and logs the same on either plugs, but the Ruth’s require less attention is seems, as they don’t drastically open over 5k…. Not really sure why EQT likes to specify brisks “should be a last resort”

 

[SonicBloom]

Ugh I recently installed NGK RS7s.

 

[tigeo]

Ugh I recently installed NGK RS7s.

and they will be 100% fine....

 

[MikeyR44]

yes

Even though they are a stock heat range plug? They’re still ok to use with an is38?

 

[ZuMBLe]

Thanks! Mmm.... Basically it seems to depend on how much sustained heat you're going to be generating within the cylinder.

My car is mostly daily driven, but will get driven harder on backroads 6-8 times a year and, hopefully soon, once or twice per year at the track. Maybe I'm better off getting the NGK RS7 plugs and gapping them correctly. I have the gapping tool.

If you have the RS7s, gap them and throw them in. My car is mostly daily driven but also sees some back road / mountain thrashing a few times a year.

 

[ZuMBLe]

Ugh I recently installed NGK RS7s.

Part out?

 

[SonicBloom]

Part out?

DAZA swap time.

 

[tigeo]

Even though they are a stock heat range plug? They’re still ok to use with an is38?

They are heat range 8 - that's one colder than stock (7).

 

[MikeyR44]

They are heat range 8 - that's one colder than stock (7).

They are definitely heat range 7. Taken directly off NGK's site.

 

[El_bigote_AJ]

Probably just thought you were questioning the rs7s…


Yes Ruth’s are stock heat range, yes there are a handfull of us running them on cars with hybrid 38s let alone oem 38s

 

[tigeo]

They are definitely heat range 7. Taken directly off NGK's site.

View attachment 234992

Sorry, got your post confused with someone else above, thought you were taking about the "RS7s", carry on...hahahaha. Yep, Ruth's are heat range 7 I am running them in my IS38 wagon including beating on them on the track...they are fine....I've run Denso IKH24s, stock NGKs, and the now infamous NGK "RS7" all with zero drama/issue.

Here is my plug table:

 

[daconchslop]

Yeah my car runs and logs the same on either plugs, but the Ruth’s require less attention is seems, as they don’t drastically open over 5k…. Not really sure why EQT likes to specify brisks “should be a last resort”

They were the ones that were grenading motors first, or something like that. I remember seeing posts about the ceramic breaking off on the Brisks.

 

[MonkeyMD]

Ran rs7 plugs on track with temps up to 280. 5 x 25 min sessions. Then ran them for another 10k miles. 20k total miles before changeout. No issues, no misfires that I could detect. Didn't log, but nothing noticeable.

Of course my tune is pretty conservative, so may be different for those running closer to 30. Not sure if it matters or not.