ok, for my service im changing plugs, I can't really find the information i need on here

 

NGK code is pfr6b-11

 

there are ratings for

 

standard

cold

hot

 

what is the difference between the three, the best one to use, and the pros vs cons :D

As far as I knew if you run more boost you are meant to run a colder plug.

 

try here for more info

http://www.extrememotorsports.com/plugfaq.htm

 

Here's a typical NGK spark plug part number: BPR6EVX-11.

 

A quick run down of the part numbers. Each letter or number has significance in the NGK part number, but the same letter may hold a different meaning depending on where it is placed. Here is a rundown of our part number:

 

B Thread diameter = 14 mm

P Construction = Projected Insulator Type

(K) Construction = Hex size 5/8 in, projected tip

R Construction = Resistor Type

6 Heat Rating Number = 2 Hot -> Cold

E Thread Reach = 12.7 mm

S Firing End Construction = Standard 2.6 mm diameter center electrode

(VX) Firing End Construction = High performance platinum

(K) Firing End Construction = 2 ground electrodes

(N) Firing End Construction = Special side electrode

(-11) Gap Width = 1.1 mm (0.044 in)

pfr6b-11b is the stock plug. For colder you need something with a 7 in it (if it's an NGK). Normal recommendation is one range colder fo every 50-100bhp over stock.

I use ZFR7F-11 coppers, BKR7EIX-11 irridiums also work.

NGK Part number pdf

 

http://www.largeinit.org.uk/NGKPlugpartnumberkey.pdf

 

HTH

 

Pete

http://www.300zx.co.uk/forums/showthread.php?t=28131&highlight=colder

 

Some good info here Mike.

pfr6b-11b is the stock plug. For colder you need something with a 7 in it (if it's an NGK). Normal recommendation is one range colder fo every 50-100bhp over stock.

I use ZFR7F-11 coppers, BKR7EIX-11 irridiums also work.

 

Just about to put these coppers in mine to

cheers guys ;) guess ill stick with standard until the clutch and boost upgrade