anyone know where the best deal for plugs is at? i did a search with no luck.. thanks
Jimmy

Careful not to go too cool. They'll foul up on you.
Tinman got some recently. pm him for details.
C.

If we can find a way to get the cooper equivalent plugs that would work in our car, we would be better off with those and a one step colder plug. They are a cleaner running plug, but don't last as long. But are definitely much cheaper.

DaveO is running colder plugs now too... I don’t think he's had them very long so don’t know about fouling yet. I'm sure he'll report after analysis.

Tinman, a post with your impressions would be appreciated - thanks.

I had one step colder plugs before Dave put them on to try them out. I had them in for 15k, never had a issue. I am researching right now what equivalent plug in copper will work for our cars, because it will make the car run better than the plugs that are in it stock.

Update....

Been doing some research today and found the equivalent to the stock plugs in our G35.

NGK type LFR5A-11 Copper Spark Plugs

The ones our G35 come with is PLFR5A-11 Platinum Spark Plugs.

Now if you want one step colder LFR6A-11 (colder).

I will be getting some of these soon once my car is here. Copper is the best conductive material you can find for a spark plug, and it provides a better spark. They only last 30k, but for the price of a couple bucks each, its well worth it. The Plats and Iridiums are good plugs for how long they last, but if your into performance, they are not what we need!

http://www.sparkplugs.com/
I ordered 12 of these LFR6A-11, they were about 65.00 shipped.

Right on - thanks for the info. I don't put many miles on my car, so longevity is not as much of a concern as performance for me. Looks like copper is a better option. Thanks for the update.

BTW, I’m planning on TS ECU and expect some pinging… do you think the colder copper plugs will help?

hey guys thanks for all the info!

*golf clap*

We tried to get an experienced based Iridium Spark Plug discussion going in the Premier Members Sport Z Magazine Forum. Unfortunately Dennis, Ben and I weren't able to generate much interest... so far.

I've been running one step colder pluges in my N/A modified AT Sedan for about 1,500 miles to date. I did this because the engine occasionally knocks on a real hot day, it has always "pinged" on the dyno, the standard spark plugs looked to be running a little hot... and I needed first hand experience to develop the "Adding Spark to the VQ" article - see the Summer Issue of Sport Z Magazine.

According the the the factory service manual, my car meets at least two out of the three criteria for the "Cold" plug...
1) Spark plug knock;
2) Extended high driving;
3) Frequent high engine revolution. (sometimes)

The service manual indicates three spark plugs can be used in our VQ engine.
Standard type - PLFR5A-11
Hot type - PLFR4A-11
Cold type - PLFR6A-11

I believe the part numbers are...

Nissan #22401-5M015 = NGK PLFR5A-11
Nissan #22401-5M014 = NGK PLFR4A-11
Nissan #22401-5M016 = NGK PLFR6A-11

and the "P" = platinum. If you drop the "P" it becomes the NGK copper plug number.

The subjective results?
1) Slightly improved power and gas mileage. (May just be from the new plugs.)
2) I cleaned the inside of my exhaust tips when installing the 6s. To date the pipes have remained reasonably clean. At least the same as with the 5s.
3) No pinging on the street... but no re-dyno to really test the results so far.

That's my story and I'm stickin' to it -- at least for now.

i thought that colder plugs were needed when going with NOS setup? so, if a n/a car has headers, y-pipe and crank pulley, the colder plugs would be an additional benefit? in other words, it wouldn't hurt, correct?

Sorry to bring an old thread back but in this summer heat, and even on a not so hot day but during engine heatsoak, I get some immediate light engine knock during very light acceleration. The other day I was coming up a small hill and had to stop at a light. I put it in first and proceeded through the light once it turned green. Even in first I got a tiny bit of knock/ping (more like a gargling sound) during the initial points of very average and mild acceleration. I can understand it happening in 2nd when the RPM's start out too low but 1st?

Anyway, would the post quoted above solve my problem? Anyone else experience this and try a 'cold' plug?

Thanks for the help.

Colder Plugs are needed for NOS. I'm using 2 step Colder Regular NGK plugs. I've had them on for around 20,000 miles No Fouling, Just a little less performance driving around while not squeezing.

ok, thanks.

Mine were just delivered today!! Fast Shipping ....good Vendor.

$36.99 for a set of Iridium is hard to beat!!!

http://cgi.ebay.com/ebaymotors/NGK-I...QQcmdZViewItem