frankie

hey guys i need some help with this subject. am new to the with spark plug and i dont understand which plugs to get .i want to buy some ngx iridium plugs but i have visted some other peoples thread and they talk about the plugs being colder and thats where am lost. i have a stock z wich plugs shoud i get then?

HighwaySpeed

iS tHiS eNgWiSh?

Mike Wazowski

iTrader: (113)

stock Z, just stick with the stock plugs and you will be fine. If you do some major NA mods or go FI, then look at the upgrade. Right now, it wont do a damn thing for you.

zownz

iTrader: (28)

+1 ^^

bailey bill

Just like the one's Nissan put in it.

bill

DJMatrix1067

generally speaking-

One step colder is used for FI

Regular plugs= for regular cars. its not a performance upgrade really. if you had other major NA mods and then upgraded to the plugs, it would just fully maximize the potential for hp gains from your NA mods. it wont necessarily give you any noticeable gains.

SargentZ

Aren't the Iridium used on the new 07s VQ35HR? I don't think the 06 and olders use them though.

gabez33

iTrader: (7)

Yes, the 07's have iridium plugs standard. You can get some denso iridium power for your Z, the one step colder ones though are usually for FI application though

gabez33

iTrader: (7)

Get denso iridium powers, or NGK iridium....but dont get the one step colder for your NA car

IP05G35

1 step colder plugs are good if you have a flash tune with advanced ignition timing.

msand22

Hopefully someone can clear this up for me. I have a 03 Base, stock except for intake and exhaust. If i'm changing the stock plugs and going with iridium instead of OE, which is double platinum, is there any benefit? The iridium are a lot more per plug so if there is no benefit the i might as well go with the OE design. Also does anyone know what interval the spark plugs and ignition wires should be changed at, i'm at 52k and i'm pretty sure it needs it.

rocks

iTrader: (1)

Makesure you get some red magnacore wires!

MUZZY

iTrader: (28)

u need 1 step colder for when u play around with your timing (FI aplications)
iridium is to get maximum hp potential from a tune

so if you dont have a tune or flash or FI

just get normal plugs

Bevo

I just read the maintenance guide it says replace spark plug at 10,500 miles

Lawn Dart

iTrader: (4)

Correction - 105,000 miles

Here is a very good article
http://www.ngksparkplugs.com/techinf...s/techtips.asp




First of all, multi-electrode spark plugs are a waste of money. Generally, the spark only jumps to one electrode.

Next, you may be asking yourself, what is the relationship between copper, iridium, and platinum tipped spark plugs? Simply put, copper has the highest conductivity and least resistance to corrosion. Iridium has the second best conductivity, however has better resistance to corrosion than copper. Platinum has the greatest resistance to corrosion but worst conductivity of the three. Basically, you have performance and longevity to consider. How much performance are you willing to afford if the cost is the having to change your spark plugs roughly every 15,000, 45,000, or 105,000 miles?

Wired 24/7

iTrader: (2)

There are other factors to consider lawn dart. sharp platinum (also iridium) edges are also combustion catalysts (copper sort of, not as much). It may play a role in flame seed propagation.

If you want to play it safe, you will always be fine with the service manual recommended spark plugs. You don't need 1 step colder for most applications.

A colder spark plug means exactly what it sounds like. It's not the spark that's colder... it's the plug itself. The plug serves 2 purposes. 1 is ignition. 2 is acting as a heat sink to draw heat away from the cylinder. A colder spark plug is used where hotter cylinder temperatures arise. I believe the reason is to maintain a good temperature at the tip of the spark plug so you don't get pre-ignition but you get a nice hot flame seed when it ignites.

If spark plug is too hot, you will probably get major problems. If spark plug is too cold, you might lose power or efficiency...

Please someone correct me if I'm wrong.

Bevo

thanks, i forgot a "0"

Lawn Dart

iTrader: (4)

I completely agree. However, I just try to keep it simple for us backyard mechanics.

You're dead on. If a spark plug is too cold, it won't be hot enough to burn off carbon and other deposits, witch can causing fouling or misfiring. If it's too hot, the searing tip can cause preignition.


NGK PLFR5A-11 Platinum
NGK LFR5AIX-11 Iridium