EgoBuSTeR

Hello,

Whats so good about the iridium spark plugs...im debating on which to get...does it matter if they are iridium or not?
Help please...thanks

leo

1QWKEVO

iTrader: (3)

ya iridium last longer and the spark is more concentrated, if your racing or messing with a/f ratios and what not jsut throw platinum in or copper and change them out every month...

GTVEVO

iTrader: (22)

Use copper, don't use platinum due to heat. BPR7ES NGK is a great plug to use on a EVO. Cheap and they will do the job for you.

evoD

iTrader: (4)

please keep in mind...our factory spark plugs are already iridium. make sure you know what you're doing if you choose to go with different spark plugs, as resistor type copper, platinum, and iridiums all ignite differently.

Deceit

iTrader: (6)

How soon did you all change your plugs and with what modifications/gap?

gldenchld

iTrader: (7)

go with denso iridium iw22

GTVEVO

iTrader: (22)

Earlier I said use copper and now I would like to retract that statement. You will feel a decrease in performance if you change to a copper plug. I went back to the iridium tip, money well spent. Sorry for my last statement I was wrong.

SFPRacing

iTrader: (1)

Although the 2023 BPR7ES's are great plugs, another good one is the NGK 4091 V Power plugs. We use them in evo's with great luck. Oh and yes Denso Iridiums are awesome plugs. In the MKIV Turbo supra's they're one of the only plugs that doesn't really ever have a miss under high boost.

berkel

iTrader: (5)

I had used copper plugs when I was trying to dial in the N20 on my Integra and also in my turbo Audi. However, I have NGK iridums in my wife's WRX wagon and I'm sticking with Iridiums (Densos) for my EVO. Silver Surfer has a recent thread in the Drivetrain forum. There is another older long-*** thread about copper plugs floating around. Some advocated the copper ones, but a few also reported missing and less power with copper plugs.

BTW, per the long thread, the owner's manual lists .024-.026 as the recommended gap, whereas the shop manual lists .028-.03. I checked my stock plugs, and with my feeler gauge they seemed to be ~.026. The Denso iridiums I got from Z1 are pre-gapped at .028. I think the tip is to go with the largest gap that doesn't miss. Hopefully .028 will be good. Did you check/change the gap GTEVO? It's kind of a PITA to change the gap with the iridiums. I broke one of the NGK's I put in my wife's car.

Take care,

FB