Denso Iridium Heat Ranges

[koolgtstarlet]

Has anyone ever used Iridium plugs in their cars and what was the heat range used.

cheers,


andrew

 

[patglanza96speedy]

in ngk mate 7 grade

 

[koolgtstarlet]

I am using Heat Range: 22, then what grade would that be??

 

[tgidavid]

I'm using stock heat for 3sgte engines.

 

[HYBRID]

the most ppl use are grade 7, however if ur running more than 18psi it is suggested to use grade 8 plugs..

the plugs i use give an equivalent of the NGK IK31's

kon