old but fast

What is the best plug P3 or P4?

Running in the UK so don't see much sun or teperature

Cheers

jpalessi

iTrader: (55)

I like the p4

stipres

iTrader: (70)

i run a OS Speed and Vspec...i have never ran anything else other than the P3's. Rain, shine, hot, cold, or humid; the P3 always works without a problem. If you are in cooler weather I would definately go with the P3.

D8

iTrader: (2)

P3 all the way... in three gallons I've only replaced the plug one time...

old but fast

Looks like I will go with the P3 I think this is what came with the engine when I bought it new (not run it yet).

Cheers guys

xyzyx00

iTrader: (6)

ive ran p3's and p6's. the p6's werent hot enough to hold a reliable idle without dying but it would run fine once it was going. i switched to the p3 which has been what i have been running ever sinse without any problems. its also what OS reccommends

jamminnay

iTrader: (11)

all of the guys i know run the p3

DaveNJ80

iTrader: (18)

P3 all the time. I switch to a P4 and P6, then went back to a P3 because it gave me the best performance.

Steve Walters

iTrader: (1)

P3, 365 Days a year here.....

sand geek

iTrader: (22)

gotta listen to this guy, his back-up v-spec has like 30 gallons on it

rossoh10

iTrader: (10)

Yep his back up just won`t die......

jpalessi

iTrader: (55)

The hotter plugs make for a larger tuning window.The colder plugs P4 and P6 narrow the tuning window, but when tuned correctly will make more power, and get better run times.
I run P4's year round, and my engines are always rippin..lol
I actually want to try the new p5's on a nice clear day in 09.

old but fast

I am told the new Ninja engines use the same P3 plug, the engine is made by OS so this would make sense + Sirio engines also use the same plug. If this is correct it may be cheaper not to buy the OS branded plugs for my V Spec as the other manufactures I mentioned sell the same plug for a cheaper price.

jpalessi

iTrader: (55)

The Siro plugs have the same taper, but are NOT the same plug.. I would stick with the OS plugs in your V spec or Ninja JX. P3 Or P4. If your not confident in your tuning ability, stick with the P3