Spark Plugs - Ngk "8" Heat Range (much Colder Plugs Than Standard)

[The Mafia]

ok, I've been stuffing around with plugs for a little while now and have come up with some interesting results:

I've used

BKR6EYA (6 heat range copper)

BKR6EIX (6 heat range iridium tipped)

BKR7E - (7 heat range copper)

R5671A-8 (8 heat range copper)

ok, 6's are fairly ordinary. Iridium are a waste of money... No difference in performance.

7's are fairly ordinary too. No noticable difference.

8's.... I was able to add about 3-4 degrees into the 1\4 load to 3\4 load without detonation. However at full load, I was unable to add ignition advance without detonation issues.

But this gave the car a little more punch in the areas that had the advance, obviously, after being able to advance timing, and timing advance = power..

so yeah, just thought I'd share some more of my findings.

oh, and no starting issues. When the car is stone cold, it might need to be cranked over for about 1\4 longer than normal, but when hot... not a difference at all..

[Adriano]

That is a good result, however i recently had to emmisions pass an EVO1lancer, and with 8's it failed miserably, simply replacing the plugs with 6's made the car pass.

[The Mafia]

why would colder plugs make it fail emmissions?

[Busky2k]

Incomplete combustion maybe?

At low loads, the colder plug might be 'stealing' more of the combustion chamber heat and thus you can advance the timing a tad more..

[yogi000]

Incomplete combustion maybe?

At low loads, the colder plug might be 'stealing' more of the combustion chamber heat and thus you can advance the timing a tad more..

is this better or worse?

[grandmasterb]

ok, I've been stuffing around with plugs for a little while now and have come up with some interesting results:

I've used

BKR6EYA (6 heat range copper)

BKR6EIX (6 heat range iridium tipped)

BKR7E - (7 heat range copper)

R5671A-8 (8 heat range copper)

ok, 6's are fairly ordinary. Iridium are a waste of money... No difference in performance.

7's are fairly ordinary too. No noticable difference.

8's.... I was able to add about 3-4 degrees into the 1\4 load to 3\4 load without detonation. However at full load, I was unable to add ignition advance without detonation issues.

But this gave the car a little more punch in the areas that had the advance, obviously, after being able to advance timing, and timing advance = power..

so yeah, just thought I'd share some more of my findings.

oh, and no starting issues. When the car is stone cold, it might need to be cranked over for about 1\4 longer than normal, but when hot... not a difference at all..

Can i sak what boost you were running and also the other mods to your set up???

Did u change the boost setting as well as the ignition timing, did you change the fuel tune as well???

Cheers GMB

[BOOSTD]

I've run Iriway 8's and found if i gave the car a squirt when cold the plugs would foul. Apart from that it was all good.