I'm going to check on my spark plugs tonight and see if they need to be replaced. I noticed new ones cost $35 each at AutoZone, though. Is there a place to buy good plugs cheaper?

 

wtf kind of plugs r 35$ each lol...

i just picked up and put in Ngks , and went with 8mm accel wires...

 

Yeah, I know that price is totally nuts. I don't know anything about what makes the leading and trailing plugs special though, so I've shied away from getting anything other than the Mazda recommended part numbers until I hear from somebody here that it's okay to get something else.

 

NGK's, if you're all stock bur7eq for leading and bur9eq for trailing.

 

^ what i got...

 

Thanks guys, found those for $5.50 online (should work great - other than HKS filter, car is stock). Got a half-million other things to fix on the poor car, glad I can save money somewhere.

 

$35 a plug, they better be Iridiums...

 

Spend the extra buck a plug and get the plats.


Also Advanced Auto Parts (may or may not be in your area) Carries these plugs for the same price as the online sellers. Just go ask for them by name, and if the local doesn't have them they'll ship them in within a day or so.

 

I think they were. I'm guessing they're not worth it unless I've done other mods?

BTW, you did a great job with my rebuilt CPU! Thanks!

 

None in my area . Do you happen to know the part #'s for the platinum versions?

 

Just add P to the end of the regualr NGK part number for the platinum versions.

I have some platiumums and some copper NGKs on my website right now, but I have not ordered NGK for a while so I don't remember what parts are in stock (the website will know however).

I think I had them around 6 or 7 bucks each

 

have you heard of running all plug #7 on both leading and trailing is there any advantage or disadvantage to that?

 

Someone over here said that the 7 is "too hot" for the trailing side.

 

Rotarys eat steel leading plugs every 2 oil changes.

Leading - NGK - BUR7EQP (platinum) should be about $7 ea at Autozone.
Trailing - NGK - BUR9EQ should be about $5 ea.

That set should last maybe 20,000 miles.

 

So the trailing plugs don't need to be platinum? What about iridium plugs? Are they worth the cost?

 

what if u have them in backwards?

 

From what I have been reading, platinum is not a great choice for a boosted vehicle.

From Kenne Bell's site:

 

ok great so running iridiums? would that have an I at the end of the part number? im getting new plugs this weekend

 

I'm curious on this as well...it's been mentioned that the 7 and 9 plugs are good for stock to mildly modified cars....is there a better choice for a more modified car? What "level" of modification are these statments based on? What is the difference between iridium and the standard plug?

 

If your tune is so hot that leading platinums are only lasting 7000 miles, then iridium leading plugs with platinum trailing is probably what you need.

The leading plugs get twice as much spark wear as the trailing.

 

I just run regular BUR9EQ plugs in all locations. But this is generally recommended for higher HP applications.

 

yeah that is what I run as well, Iridiums on the leading platimuns on the trailing (although the only real gain in using platimuns is that added life. The spark is not any stronger or anything like that than regular copper trailing plugs).

 

Yeah, you would probably want to avoid the 9's in colder climates on the leadings as they have a tendency to foul when the engine is cold (sub freezing temps).

 

Yeah, the 9s are harder to start on those frigid Tucson mornings, but most will agree that if you start running large numbers, the 7s are just too hot, and will cause pre-ignition.

 

Alright, how about running the 1st gen plugs? (i forget model #'s)...I've heard a couple people recommend this. What's the reason behind this?