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vcrpro3
05-31-2009, 05:14 AM
What p/n in a NGK or Denso iridium plug( or other brand Iridiums) would be a good substitute for a Champion RN11yc4? Vehicle is mostly a daily driver but sometimes extend freeway runs
2.5l intercooled max boost at 15psi
manual trans
BadAssPerformance
05-31-2009, 09:07 AM
RN11YC4? are those the fancy ones with the 4 little tips on them?

I just run the Champions, RN9YC plugs or the stock RN12YC in a more stocker car. NGK V-Power plugs are decent too.

Fancy plugs dont really make more HP, kinda like snake oil...
vcrpro3
05-31-2009, 12:20 PM
RN11YC4? are those the fancy ones with the 4 little tips on them?

I just run the Champions, RN9YC plugs or the stock RN12YC in a more stocker car. NGK V-Power plugs are decent too.

Fancy plugs dont really make more HP, kinda like snake oil...

That is the champion p/n for a plug that's 1 heat rannge colder than the RN12's
BadAssPerformance
05-31-2009, 12:47 PM
What does the "4" mean?
vcrpro3
05-31-2009, 01:09 PM
Some useless federal emissions category rating bs........
BadAssPerformance
05-31-2009, 02:15 PM
OK, looked it up, it means wide gap. So they would have to be gapped down quite a bit to get to .035"

I'd probably just run the RN12YC if your only running 15psi and mostly stock?

http://www.championsparkplugs.com/images/champion.jpg
turbovanmanČ
05-31-2009, 03:33 PM
I like the Iridiums as they last forever, V-power last an oil change, :(
vcrpro3
05-31-2009, 04:54 PM
I like the Iridiums as they last forever, V-power last an oil change, :(
what brand and p/n iridiums are you using? My main concern that as a daily driver with our ambient temps at 100F+ degrees in a car that already runs somewhat hot, i need a step or two colder plug than stock.
turbovanmanČ
05-31-2009, 05:13 PM
what brand and p/n iridiums are you using? My main concern that as a daily driver with our ambient temps at 100F+ degrees in a car that already runs somewhat hot, i need a step or two colder plug than stock.

I run BR9EIX, they are a cold, recessed plug, awesome for detonation control,
BadAssPerformance
05-31-2009, 06:17 PM
I like the Iridiums as they last forever, V-power last an oil change, :(

Maybe in your van that eats every part ;)

In a stock car (even my 'stock' T-II shadow) the v-power or even Champions last forever :thumb:
turbovanmanČ
05-31-2009, 11:57 PM
Maybe in your van that eats every part ;)

In a stock car (even my 'stock' T-II shadow) the v-power or even Champions last forever :thumb:

V-power don't even last in N/A stuff, they are a soft plug, :o