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Old Feb 9, 2009, 08:23 PM   #1
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Best spark plugs for evo 8

Let me know what spark plug to get and the a link if possible
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Old Feb 9, 2009, 08:25 PM   #2
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Search Spark plugs.
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Old Feb 9, 2009, 08:48 PM   #3
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Old Feb 9, 2009, 09:22 PM   #4
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NGK BR_ES (7 for stockish, 8 for modded)
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Old Feb 9, 2009, 09:25 PM   #5
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Old Feb 9, 2009, 09:45 PM   #6
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Copper Plugs:

Stock/Bolt-Ons - BPR7ES

Bolt-Ons/Bigger Turbo + High Boost - BPR8ES

Iridium Plugs:

Stock/Bolt-Ons - BPR7EIX

Bolt-Ons/Bigger Turbo + High Boost - BPR8EIX

Link...

http://www.extremepsi.com/store/cust...pe=Spark+Plugs

Copper plugs are cheaper but need to be changed more often. Plugs with the heatrange of 7 should be good for boost levels of 25 and below. If you're running more than that, you should probably go for heatrange 8.

Last edited by MasterNater; Feb 9, 2009 at 09:51 PM.
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Old Feb 10, 2009, 07:20 AM   #7
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Id buy the BR7ES and the BPR7ES. Try them both and decide which you think your car runs better on.

BR7ES - Non Protruding Tip
BPR7ES - Protruding Tip

I used to run the BPR I then tried the BR and found the car to like non protruding a bit more. I wouldn't switch to 8's until you gobigger turbo

The 7's = Stock heat range
The 8's = A step colder
Incase your were confused
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Old Feb 10, 2009, 07:23 AM   #8
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You can go to NAPA auto parts and get the NGK BPR7ES copper plugs. They are like 2 dollars each and work great.
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Old Feb 10, 2009, 10:36 AM   #9
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I think my BPR's knock less than BR.. it may be subjective... but theory goes that the closer the spark to the center of the chamber (with projected/protruding design) — to ignite the mixture from the center — the better the results/burn. If it's burning from the middle the process should happen faster (good for power and knock prevention). Non-protruding/projected tips were designed for smaller clearance chambers to avoid the piston hitting the plug tip.
It's also thought that BR is a half step colder than BPR..
All above, FWIW...


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Old Feb 10, 2009, 12:07 PM   #10
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^ Thinking about it that does make a lot of sense. I did run the BPR's for a while like I said though the car seem to run a bit smoother from the BR's. This was on the stock heat range with full boltons.

Now I'm big turbo and switched to the 8's. I immediately just picked up the BR's as I ran them in the 7's.

I'm going to grab BPR8's and see if I can feel any difference good or bad from the BR8's. I'll put the car into various situations and log each (Not sure that I'll see anything).

I def see where the theory of the protruding tip should produce a more complete burn.

Good Discussion
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Old Feb 12, 2009, 09:37 PM   #11
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thanks for the help
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Old Feb 13, 2009, 05:05 AM   #12
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Quote:
Originally Posted by mplspilot View Post
I think my BPR's knock less than BR..
There is another school of thought which contends that a protruded tip, such as that of the BPR's is more prone to preignite the air/fuel mixture than the BR's recessed tip is. In this scenario, the hot, glowing tip, protruding further down into the combustion chamber, auto-ignites the air/fuel mixture prematurely, before the piston reaches TDC on the compression stroke, and before the sparkplug fires.
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Last edited by sparky; Feb 13, 2009 at 07:23 AM.
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Old Feb 13, 2009, 05:47 AM   #13
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EDIT: Sorry.
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Last edited by sparky; Feb 13, 2009 at 05:58 AM.
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Old Feb 13, 2009, 07:19 AM   #14
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You can also pick these plugs up at Pep Boys in Raynham or however you spell it. They had them in stock a couple weeks back when I got them.
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Old Feb 13, 2009, 07:23 AM   #15
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Old Feb 13, 2009, 07:23 AM
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