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Old 11-11-2004, 11:59 PM   #1
Wombat North
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Default STI NGK Colder plug numbers from SEMA.

While at SEMA I asked the tech guy from NGK if there were colder plugs out for the STI yet. We had a look at the catalog and he pointed out these below are the colder ones.

LFR7AIX
#2309

NGK tech info
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Last edited by Wombat North; 03-18-2005 at 08:54 PM. Reason: NGK stock number had changed
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Old 11-12-2004, 11:21 AM   #2
x99percent
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I think those plugs come gapped for NA applications... (0.044")

Edit: There's even contradicting info on NGK's site... if you look up the spark plug for a 2005 Legacy Turbo, they give you "LFR6AIX-11". The "11" means a 1.1mm gap (~0.044"), but they show a gap of 0.030".

http://www.ngksparkplugs.com/apps/ca...engineid=36236

On the NGK site, looking up the spark plug info for a 2004 WRX, STi, or Forester XT is all screwed up.

Last edited by x99percent; 11-12-2004 at 11:36 AM.
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Old 11-12-2004, 11:58 AM   #3
Wombat North
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FWIW
Info on STI plugs was taken out of the new catalog he had with him. Catalogs and Websites can be wrong as others produce them so I gave out the techs direct line for anyone who wishes to confirm the #'s.

Here's the toll free also
887 473 6767 press option 2
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Old 11-12-2004, 01:13 PM   #4
x99percent
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I looked up LFR7AIX on sparkplugs.com... that's where I saw the gap of 0.044".

Then I went to NGK's site and got nowhere fast.

... [time passes]

I placed a call to sparkplugs.com. They pulled one off the shelf and verified that their online catalog is incorrect (the catalog showed 0.044", link). The gap actually measured 0.032"-0.033".

Ordering a set now!
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Old 11-12-2004, 01:20 PM   #5
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Quote:
Originally Posted by x99percent
I looked up LFR7AIX on sparkplugs.com... that's where I saw the gap of 0.044".

Then I went to NGK's site and got nowhere fast.

... [time passes]

I placed a call to sparkplugs.com. They pulled one off the shelf and verified that their online catalog is incorrect (the catalog showed 0.044", link). The gap actually measured 0.032"-0.033".

Ordering a set now!
So those are the colder plugs for the STi as well? (05 STi that is)

cheers

Nick
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Old 11-12-2004, 01:32 PM   #6
x99percent
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I am unaware of any changes to the motor.
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Old 11-12-2004, 02:16 PM   #7
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did you order them on line?
sparkplugs.com does not list plugs for the STi?
Never mind it does not list the 05 MY.
the ones you are getting are those right?

LFR6AIX-11

Thanks

Nick
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Old 11-12-2004, 02:22 PM   #8
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LFR7AIX = one range colder, w/ proper gap.
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Old 04-22-2005, 11:42 PM   #9
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My set came today! Sparkplugs.com

free sticker too!
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Old 04-23-2005, 01:19 PM   #10
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What benifit is there to run colder plugs? Is it more for modified cars?
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Old 04-23-2005, 08:44 PM   #11
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These plugs (LFR7AIX #2309) are properly gapped for the STi from NGK. I just received my set from Topspeed, who claimed that they were properly gapped, and I called NGK tech for confirmation. According to the tech, they come gapped at .0030 from the factory. I'm definitely going to check it out for myself before putting them in my car.

Irishman- I'm not an expert, but colder plugs are supposed to increase the cars knock threshold, thus adding a bit of safety (or headroom to tune). I bought them because I would like my car's tune (UTEC, TBE, Intake, FMIC) to be as safe as possible. If you search there should be some good threads with more in depth discussion on the topic.

-Matt

Last edited by MattSTi; 04-23-2005 at 08:50 PM.
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Old 04-23-2005, 09:48 PM   #12
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Old 04-24-2005, 12:29 AM   #13
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Great info on that website. Thanks.
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Old 07-27-2005, 01:56 AM   #14
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Quote:
Originally Posted by MattSTi
These plugs (LFR7AIX #2309) are properly gapped for the STi from NGK. I just received my set from Topspeed, who claimed that they were properly gapped, and I called NGK tech for confirmation. According to the tech, they come gapped at .0030 from the factory. I'm definitely going to check it out for myself before putting them in my car.

Irishman- I'm not an expert, but colder plugs are supposed to increase the cars knock threshold, thus adding a bit of safety (or headroom to tune). I bought them because I would like my car's tune (UTEC, TBE, Intake, FMIC) to be as safe as possible. If you search there should be some good threads with more in depth discussion on the topic.

-Matt
These are the NGK IX iridium?

saw this info on sparkplugs.com
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Old 08-11-2005, 05:25 PM   #15
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do the LFR7AIX need to be gapped? On my packing slip for my plugs that i recieved today it says not to gap as i will break the center electrode if i do...
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Old 09-24-2006, 10:02 AM   #16
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Quote:
Originally Posted by Inprogress View Post
do the LFR7AIX need to be gapped? On my packing slip for my plugs that i recieved today it says not to gap as i will break the center electrode if i do...
Curious as well..
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Old 09-24-2006, 10:29 AM   #17
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Quote:
Originally Posted by Inprogress View Post
do the LFR7AIX need to be gapped? On my packing slip for my plugs that i recieved today it says not to gap as i will break the center electrode if i do...
NEVER gap fine-tip plugs by prying against the tip.

If you have a proper gapping tool, you can set the gap without touching the tip at all. Use feeler gauges or something similar to measure the gap.
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Old 09-26-2006, 09:37 PM   #18
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Do these also fit a WRX? I have an extra set of these lying around, if anybody wants them cheaper?
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Old 09-27-2006, 11:46 AM   #19
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STi "long reach" plugs are very different than WRX plugs.
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Old 09-27-2006, 12:10 PM   #20
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ALL NGK plugs come pre-gapped. That's what the "-xx" at the end means.
-11 = 1.1mm (0.043-0.044") gap
If there's nothing at the end then it's the standard 0.8mm gap.


http://www.sparkplugs.com/results_cross.asp?pid=LFR7AIX
The LFR7AIX has a 0.8mm or ~0.031-0.032" gap.

And the 2.5L and 3.0L use longer reach plugs like the STi?
http://www.sparkplugs.com/results_fi...pid=LFR6AIX-11


The WRX uses shorter reach plugs like a Miata or BMW would use
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Old 04-20-2007, 11:37 AM   #21
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Well, it looks like the NGK LFR7AIX plugs are now "obsolete", according to sparkplugs.com ...

A new part number is NGK ILFR7H ... these should last longer than the LFR7AIX, as they are in the same series as the stock plug (meant to last).
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Old 10-02-2007, 06:22 PM   #22
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Quote:
Originally Posted by x99percent View Post
Well, it looks like the NGK LFR7AIX plugs are now "obsolete", according to sparkplugs.com ...

A new part number is NGK ILFR7H ... these should last longer than the LFR7AIX, as they are in the same series as the stock plug (meant to last).

but you can still order the LFR7AIX for 8 dollars a plug there.
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Old 12-03-2007, 10:32 PM   #23
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Anybody running with the NGK ILFR7H plugs? How are they holding up?
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Old 12-03-2007, 10:49 PM   #24
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Quote:
Originally Posted by Beanboy View Post
Anybody running with the NGK ILFR7H plugs? How are they holding up?
.......they are just like any of the other iridium plugs and should 'hold up' the same
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Old 12-07-2007, 02:05 PM   #25
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whatever you get, do NOT get the -11 plug, regardless what it says on ANY site. Confirmed with sparkplugs.com, which is a very helpful company by the way.

The person I talked to confirmed the site(s) are wrong, and that all LFR7AIX are the same as the "new" ILFR7H. which is $3 more by the way

Holding a LFR6AIX (stock heat range) and a ILFR7H side by side, they
are identical.
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