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Old 03-31-2005, 08:03 PM   #1
PDXTuning
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Default Spark Plug Cheat Sheet..

People often email me asking what spark plugs to get before a dyno day, so I made a quick cheat sheet.

Comments?



-Jeff
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Old 03-31-2005, 09:44 PM   #2
Rickyh
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why no copper plugs? Is it the frequent changes?
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Old 03-31-2005, 09:49 PM   #3
Jejunum
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how about for RS's now
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Old 04-14-2005, 02:43 PM   #4
peterex
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bump...
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Old 04-14-2005, 05:22 PM   #5
Unabomber
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PFR7G-G does not exist BTW. I went through three NGK "dealers" figuring this one out. The proper plug is PFR7B (NGK Part Number 4853) and I had to call NGK USA to get that info after MUCH talk with their NGK tech. This is a double platinum .030 gapped plug in one heat range colder than stock. Sparkplugs.com is about the only place to buy them and they are like $11.50 each.
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Old 04-14-2005, 05:28 PM   #6
BigJ04STi
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I've seen them for less, in case ya care...
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Old 04-14-2005, 05:46 PM   #7
sponaugle
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Quote:
Originally Posted by Unabomber
PFR7G-G does not exist BTW. I went through three NGK "dealers" figuring this one out. The proper plug is PFR7B (NGK Part Number 4853) and I had to call NGK USA to get that info after MUCH talk with their NGK tech. This is a double platinum .030 gapped plug in one heat range colder than stock. Sparkplugs.com is about the only place to buy them and they are like $11.50 each.
My mistake.. The part I was refering to was PZFR7G-G.

http://www.sparkplugs.com/results_cross.asp?pid=4253

But, you are correct that you would want the 7B, as it is the correct projected length. I'll correct the sheet above as well.

At that price, why wouldn't everyone use the Iridium ones?

Cheers,
Jeff
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Old 04-15-2005, 02:30 AM   #8
odin1
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sORRY, CAN'T READ THAT On MY MONITOR AND MY PRINTER IS ON THE FRITZ. cAN SOMEONE TELL ME THE CORRECT MANUFACTURER, PART NUMBER AND SOURCE FOR ONE HEAT RANGE COLDER PLUGS FOR A 2004 USDM sTI? THNX MUCH. OOps Cap lock stuck :-).
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Old 04-15-2005, 12:16 PM   #9
WRXBob
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I have been using BKR7E cooper plugs and it works very well, cheap and effective.
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Old 04-15-2005, 01:45 PM   #10
jblaine
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Good info - thanks Jeff.
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Old 04-15-2005, 02:02 PM   #11
Jimbo
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Ditto on the copper comments. I have been using BKR7E's on my conservative tune Stage III with absolutely no problems. Care to comment Jeff? Is the above table for agressive tuning?

Jimbo
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Old 04-15-2005, 02:03 PM   #12
Timdog1650
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Bump...why no copper?
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Old 04-15-2005, 02:22 PM   #13
sponaugle
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Quote:
Originally Posted by Jimbo
Ditto on the copper comments. I have been using BKR7E's on my conservative tune Stage III with absolutely no problems. Care to comment Jeff? Is the above table for agressive tuning?

Jimbo
Yes, I'll modify the table to reflect that. The copper plugs work fine, but at much higher boost (especially in the 26-30psi range), I have had much better results with the small tip iridium ones. True the coppers are cheapers, but heh, it's a 20+k car with X$s in mods. Consider that Subaru from the factory switched to the Iridium tip plugs for the STI, and that is a pretty conservative tune. As well, you have to change the copper plugs much more often, and people often don't. I recommend something based on the likly outcome, and the iridium ones have the best IMHO.

Cheers,

Jeff

Last edited by sponaugle; 04-15-2005 at 02:40 PM.
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Old 04-15-2005, 04:35 PM   #14
ride5000
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jeff, do you have any approximate power guidelines in terms of heat range? ie, 2x oem power, 1 range colder?

ken
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Old 04-16-2005, 01:41 AM   #15
eastcoastbumps
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Quote:
Originally Posted by ride5000
jeff, do you have any approximate power guidelines in terms of heat range? ie, 2x oem power, 1 range colder?

ken
Going one step colder depends on more than just power output. It also depends on how long you run the car at those higher temps. For example, you'll get the plug hotter during road racing, rather than drag racing. And what do you do if someone commutes in heavy traffic 98% of the time vs. someone that only takes thier car out for fun on the weekend? Your AFR and EGT's also play a part in picking the proper plug.

I'd recomend 1 step colder if you ever find yourself making a lot of 3rd gear pulls or if you're ever at WOT in the upper part of 4th, regardless of power output. Go 2 steps in the most extreme cases. For example, if you do several HPDE's a year and make a good bit more power than stock.

Pete
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Old 04-16-2005, 09:12 AM   #16
ride5000
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thanks for the input, pete.
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