I was looking around yesterday for parts and I stumbled on these new plugs by NGK for our cars, they are pre gapped at .35:

http://www.ngksparkplugs.com/part_fi...uv/results.asp




Cars, Trucks & SUVs

2008 CHEVROLET COBALT SS 2.0 L4 X FI Turbo

Spark Plug Part No. Stock No. Plug Gap Photo

OE Laser Iridium ILTR5D ^ # 5476 .035 n/a

# Original Equipment Manufacturer, and/or Original Equipment Service Part
^ “Laser Series” Iridium center electrode, and Platinum pad ground electrode



I called NGK's tech support and for those looking for a step colder, they recommended Stock Number 3787

NGK (3787) ILTR6A-8G Laser Iridium Spark Plug <--- these have copper cores these are pre gapped at .32

 

Nice find

 

Thanks for the info!

Ordered 4 of the 3787's.

 

What does it mean to be a step colder I ordered the 3787's but only becuase I keep misfiring and Im tuned to 24 psi are these okay?

 

Yes.

Colder plugs dissipate the heat faster, the distance is shorter between the body of the plug around the porcelain center insulator. Since you are running more boost and higher compression pressures, 1 step colder is appropriate.

 

Great information!

 

Anyone know where to get them online?

ILTR5D 5476

 

 

pm me for website with every ngk plug u want

 

I was curious about getting 1 ste colder plugs but couldn't really find much info. I'm running the regular trifecta tune at about 22lbs.

Would you recommend me getting them? I'm not misfiring at the moment and haven't had and driveability problems other than getting a misfire when doing nls when the engine is around 180f, then it goes away after that.

 

Thanks for the link- I am broke, You have been running these for quite a few months now with no issues? And they do not foul up as bad as stock plugs either from what you're post had said before?

 

I'm interested in one step colder. I'm holding 22psi.

 

anyone?

 

Mron, I've been running 6510's for about 15k miles gapped at .031 (2 steps colder) No issues, fouling or misfires at 24 psi but the shipped gap is around .044 so it took some careful gapping to close them up.

The 3787's are on order. (1 step colder than stock) I'll report back after I run them a while. They come gapped to .032 so it should be pretty easy to close them up to .030 .

 

cool

 

Jarhead - The ones I linked to above a few posts back are the stock heat range. You only need to go colder if raising the boost pressure when tuned.

 

The rule for going to colder plugs is every 75 to 100 crank HP increase you should drop to a colder plug.

On forced induction cars you use more boost (increased compression which means increased heat) typically to increase HP so I would stick to the lower figure; about every 75 crank HP I would go a step colder.

 

I just realized that these plugs are the ones that come in the car. I thought they were only a replacement.

 

FYI Rockauto has them for 8.58 per plug, must buy 4 minimum in a pack (heh duh).

http://www.rockauto.com/dbphp/x,cata...,NGK_5476.html

And if you dig around you'll find lots of 10% off coupons on the internet.

Anddd if you're really bored, here is the list of NGK plugs they can get:

http://www.rockauto.com/dbphp/x,mfrn...park_Plug.html

 

I am just wondering. i see that people are running different plugs with different gaps.

I am tuned and i have been wanting to change mine for a while. Wondering what everyones opionion is on what ones are the best.

What is the best gap to run

 

.030 to .032 gap. 1 range colder than stock if boosting >20 psi.

 

Ive been having what feels like a misfire under light throttle at lower speeds. Really feels like the car cant decided whether it wants to go into that "fuel saver" mode or not. I dont feel any misfires at wot but since im running about 23psi boost im gonna give these NGK's a shot. Gonna go with #3787

 

Well ordered me some of the NGK (3787) ILTR6A-8G Laser Iridium Spark Plug to give a try. I've always liked copper core plugs for boost applications. Going to try out the gap they come with. Thanks again for the info.

 

what are those new plugs that have the plasma coil in them or something?

 

Got my 3787's yesterday, gap was .031, left 'em there. 50 miles this morning, all is well.

I had 10k miles on the 6510's, not the 15k I thought, they looked a bit cold when I took them out. No fouling, but darker than I like. These should be just right being a heat range 6 instead of the 7's I took out.