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Old 10-28-2008, 02:14 PM   #1
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Default Which plug for OS 21VZB V spec

What is the best plug P3 or P4?

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

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Old 10-28-2008, 02:19 PM   #2
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Originally Posted by old but fast View Post
What is the best plug P3 or P4?

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

Cheers
I like the p4
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Old 10-28-2008, 02:19 PM   #3
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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.
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Old 10-28-2008, 02:24 PM   #4
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P3 all the way... in three gallons I've only replaced the plug one time...
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Old 10-28-2008, 03:03 PM   #5
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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
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Old 10-28-2008, 05:44 PM   #6
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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
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Old 10-28-2008, 06:37 PM   #7
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all of the guys i know run the p3
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Old 10-28-2008, 07:55 PM   #8
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P3 all the time. I switch to a P4 and P6, then went back to a P3 because it gave me the best performance.
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Old 10-28-2008, 08:32 PM   #9
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P3, 365 Days a year here.....
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Old 10-28-2008, 09:20 PM   #10
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P3, 365 Days a year here.....
gotta listen to this guy, his back-up v-spec has like 30 gallons on it
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Old 10-28-2008, 10:44 PM   #11
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P3, 365 Days a year here.....

Yep his back up just won`t die......
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Old 10-28-2008, 11:08 PM   #12
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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.
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Old 10-29-2008, 01:10 PM   #13
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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.
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Old 10-29-2008, 01:25 PM   #14
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Originally Posted by old but fast View Post
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.
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
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