How many miles before you changed your sparkplugs???...noticing that TC is starting to feel its age....33k and the engine shakes at idle...and cranking it up isnt as smooth as it use to be......

 

30k on the XB's

 

scion says not until 60k and it requires iridium plugs.

 

Every car i have had from turbo stangs to wrxs to an evo to the xb. I change them every 15k. Preventative maintenance -- a lot of people find that wasteful but eh. I've NEVER had a problem and I like to read my plugs to be absolutely sure everything is nice and good. Its also a wise idea to run a compression test when you change your plugs.

Just my two cents.

 

hmm... 15k sounds about right. so iridium plugs though? whats the stockers?

 

Eh, I know it calls for what it calls for.. but in all my cars i use copper. I've been using copper plugs on everything from turbo cars to nitrous cars to naturally aspirated to motorcycles, etc. Never had an issue.. I have had problems with iridium and platinum plugs (as have a lot of performance minded individuals).

You go to the local track on wednesday or friday night, 20$ gambling events and you will find 9 times out of 10 that people from big blocks to turbo 4 bangers use copper.


I wonder why most homes are wired with copper? Why most cars are wired with copper? I dunno maybe its because its one badass conductor.

Granted platinum and iridium are great but from my experience over a wide range of cars (from nitrous stangs to wicked wrx's to super supras, etc) - copper has hung there.

-G

 

my s/c S2000 pretty much is the same, i use copper. how often then if we use copper do we need to switch it out of our xB's?