hi guys i have searched but couldnt find very much info. i am curious as to what plugs people are using. my car currently has the following mods:

PFC
FMI
Apexi Filters
Full 3" exhaust including down pipe
Street Porting/3mm Apex Seals
No Air pump,power steer or A/C

Running 14PSI with stock sequential turbos i made 305 RWHP. on 98octane fuel(not sure what you have in the states)


my question is what plus should i be using?im currently running stock (9's & 7's from memory)
I have heard whispers of people using 9's&9's and even 10's&9's its all very confusing. Any help greatly recieved

Tony

 

You would probably do well with 9s & 9s with that setup. I have a similar setup (but with 99-spec efini turbos running 10PSI) and that's what I run.

 

9's should worl well, they should help with preventing detonation. NGK sells 9's i believe...about 14.00 each

 

i am also running 99 spec turbos + efini y pipe aswell.

thanks for the help

 

you could also use the NGK R7420 rotary specific racing plugs 9's all around. And we are currently running a GB on them. Here is the thread: https://www.rx7club.com/jkl-engineering-271/gb-ngk-iridium-racing-plugs-power-cable-racing-plug-wires-701009/

pm me if interested!

 

i doubt there for his application though

 

NGK B9EGV and thin wall socket. Best for the price.

 

ok now im getting messed up....i get 9's leading and trailing but am i after BUR9EQ's or
B9EGV's? whats the difference between them?

I do street drive my car but not alot and never in traffic. Currently i have BUR9EQ and BUR7EQ's

 

ones prob platinum and one iridium. the letters signify what makes up the plug. example: the "R" signifies an internal resistor

platinum plugs offer(some people say they are a waste..):
Smoother power delivery, with possibly low/mid power improvement
helps with removing slight roughness under acceleration
provide a better spark that requires less voltage to fire

iridium plugs offer:
More responsive
helps with removing slight surging or stumbling
very easy start
prob most expensive out there
will prob out-live the engine

some say getting improved plugs helps with performance but noone knows for sure. if you arnt having starting problems or having problems with plugs going out, then why waste the money

 

ok thanks alot for the help,

just one last question..... why is running a colder plug (ie 9's instead of 7's) as the leading plug better? i would have guessed a hotter plug would have been better

 

A spark plug is said to be "hot" if it is a better heat insulator, keeping more heat in the tip of the spark plug. A spark plug is said to be "cold" if it can conduct more heat out of the spark plug tip and lower the tip's temperature. Whether a spark plug is "hot" or "cold" is known as the heat range of the spark plug. The heat range of a spark plug is typically specified as a number, with some manufacturers using ascending numbers for hotter plugs and others doing the opposite, using ascending numbers for colder plugs.

If the tip of the spark plug is too hot it can cause pre-ignition leading to detonation/knocking and damage may occur. If it is too cold, electrically conductive deposits may form on the insulator causing a loss of spark energy or the actual shorting-out of the spark current

^hope this helps you