Spark Plugs

[Adjuster]

Bosch Crapnums with the side type gap are fine for NA motors, but will misfire under boost conditions.

Most "Copper" plugs will be fine, and they do work great, but the gap erodes much faster than "platinum" tipped plugs.

Best option if you want plugs in my experiance that will last for a long time, at the same basic gap you put them in at, is Iridium plugs. (Nothing however will last long in a high boost engine, so the cheaper "copper" plugs work great if your going to be replacing plugs due to detonation damage every 10k or less. It's cheaper in any case.)

That being said, I've been running the NGK Irridum plugs for years, gapped at .28, and could run 25lbs of boost on them, no problems as long as the gas was high octane..

Detonation can kill any plug, even high dollar "cold" ones.. (Cracks the insulator in my experiance, then you blow that insulator in bits and pieces out the exhaust, turbo etc.)

Oh, and anyone who puts in "Pre gapped" plugs is crazy. Ever check the gap on those plugs? I've seen them closed down to less than .15 and gapped at .50 or more out of the box... Gap your own plugs, and DO NOT HIT THE GROUND AGAINST SOMETHING TO CLOSE THE GAP! LOL Saw a guy doing that at the drags, then he was complaining his car ran like crap.. I wonder what's wrong? (The reason most gapping tools have a ground strap bending notch is to bend the ground strap? Go figure.)

 

[1988SupraDreams]

Bosch Crapnums with the side type gap are fine for NA motors, but will misfire under boost conditions.

Most "Copper" plugs will be fine, and they do work great, but the gap erodes much faster than "platinum" tipped plugs.

Best option if you want plugs in my experiance that will last for a long time, at the same basic gap you put them in at, is Iridium plugs. (Nothing however will last long in a high boost engine, so the cheaper "copper" plugs work great if your going to be replacing plugs due to detonation damage every 10k or less. It's cheaper in any case.)

That being said, I've been running the NGK Irridum plugs for years, gapped at .28, and could run 25lbs of boost on them, no problems as long as the gas was high octane..

Detonation can kill any plug, even high dollar "cold" ones.. (Cracks the insulator in my experiance, then you blow that insulator in bits and pieces out the exhaust, turbo etc.)

Oh, and anyone who puts in "Pre gapped" plugs is crazy. Ever check the gap on those plugs? I've seen them closed down to less than .15 and gapped at .50 or more out of the box... Gap your own plugs, and DO NOT HIT THE GROUND AGAINST SOMETHING TO CLOSE THE GAP! LOL Saw a guy doing that at the drags, then he was complaining his car ran like crap.. I wonder what's wrong? (The reason most gapping tools have a ground strap bending notch is to bend the ground strap? Go figure.)

I understand they come pre-gapped, but yes I always do check them anyways. Just letting this guy know because the factory gap might be better than his gap. See?

 

[1988SupraDreams]

The Autolite plugs are a bit shorter than the stock plugs. I have heard of issues of the spark plug wire boots popping off of the plugs causing issues. Any truth to this??

No, I work at Kragen auto and the Autolites (Our House Brand) are the same length as NGK's Bosch's etc.

 

[Alpinesupra]

ive been running the ngk iridium gapped to .26 and hit 20psi on the stock turbo somehow on a very cold night and ran 15 psi almost everyday and never noticed and skipping or detination or miss spark or anything.

-sean

 

[Mk3runner]

just the usual NGKs have never done me wrong in both my cars nor any others when I see them use ngks. maybe a hotter heat range depending on engine condition but besides that I see no point in using some quad point bosch or some shit like that.

 

[upgradedsupra]

Most "Copper" plugs will be fine, and they do work great, but the gap erodes much faster than "platinum" tipped plugs.

Best option if you want plugs in my experiance that will last for a long time, at the same basic gap you put them in at, is Iridium plugs. (Nothing however will last long in a high boost engine, so the cheaper "copper" plugs work great if your going to be replacing plugs due to detonation damage every 10k or less. It's cheaper in any case.)

I agree with you on this.

I change my plugs (chuck old in the garbage) every time I race the car.

Duane