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I am getting ready to swap out my spark plugs and wires in a couple weeks. What spark plugs would you suggest? This if for a 91' SS with a EJ20G swap.

Thanks

-Devan

Matt would probably be able to answer this best.

I'm going to say an NGK Platinum with the same heat range as a WRX.

DLC wrote:Matt would probably be able to answer this best.

I'm going to say an NGK Platinum with the same heat range as a WRX.

I actually just read a post by matt where he said ngk ONLY, and platinums for f/i.

Danny

NGK IRIDIUMS FTW!

DLC wrote:Matt would probably be able to answer this best.

I'm going to say an NGK Platinum with the same heat range as a WRX.

NOOO!!!


Platinum is a VERY bad idea in turbo motors, as it retains heat and can cause some nice detonation...

Just the stock NGK plugs specified for the Legacy are the best thing imho

I was just thinking of replacing my spark plugs in the next few months too (I'm running a '92 L Legacy).

I think I heard once that the OEM spark plugs were in fact NGKs, but I'm not sure (I know little to start with). These are the OEM ones I was looking at:

http://www.subaruparts.com/catalog/?section=414

Would those be ideal, or should I go out and grab some NGK branded ones?

Also, what would be good wires to use as replacements? I was looking at these OEMs:

http://www.subaruparts.com/catalog/?section=914

Thanks!

i dont like platiums. my idel sucks with them. ive got ngk type-v platinums.


"NGK Type-v IRIDIUMS cold 3 are some of the best you can get. thats what the fools down at ralli-tek use some time.


i would of got some but i had a hard time finding some plus i was in a hurry too so.

92ss satinsvoice wrote: thats what the fools down at ralli-tek use some time.

I don't think I would refer to them as fools...


maybe you though

ngk copper the very best.

NICO I WRX U wrote:ngk copper the very best.

For the first time, I agree with Nico...

But he is very right...simple old NGK coppers work very well...and I know many who swear by them, because they are a tried and true design, and they are like $2 a piece

Are the OEM plugs NGK coppers? It's just that I was at the NGK site and didn't see 'copper' anywhere.

If I'm running stock would the OEM plug wire set be fine, or would there be a significant advantage from using a different one?

get NGK iridiums and magencore race wires, best 130$ you can spend. (not really) you'll notcie a decent difference though.

92whitelegacy wrote:NGK IRIDIUMS FTW!

this is the way to go they are more $$$ but are worth every penny

NGK bkr7e

These come gapped smaller than the 1.1 mm and are one step colder.

I'm getting ready to do a tune up on my 91' N/A legacy. It's been about 3 years since i've last changed the plugs and wires.

I think i have NGK regular or iridium.

Wat's the difference between NGK iridium/platinum vs laser/non laser welded plugs? Since i've got a N/A engine would it make a noticeable difference if i used a cold or hot plug?

Could i go E3 plugs? Relatively new but they r supposed to increase hp while decreasing fuel consumption so says their video.
Their home page http://www.e3sparkplugs.com/index.htm

Either way both seem a little pricey...
Thanks in advance.

John

if you want to waste your money, sure; the "fuel consumption reductions" you may gain would be easily wiped out over the cost of the plugs.

as said in this thread before, nothing beats NGK COPPERS. get COPPER plugs. $15 plugs are not better than $2 plugs, in fact they're often worse.

Subaru went out of their way to engineer the engine to run best the the OEM plugs, they know what they're doing.

Soul Shinobi wrote:Subaru went out of their way to engineer the engine to run best the the OEM plugs, they know what they're doing.

Agreed!

Point taken

but nobody's said anything about iridium vs platinum.

As far as i can tell from google, iridium and platinum are similar. They both are corrosion resistant and have higher service intervals. Denso claims that iridium is better than platinum for it's tolerance to heat claiming that their iridium plugs will tolerate 700 degrees C more than their platinum counterparts. Is that all that's different or is there more?

I did a similar search on google for laser vs non laser and i got that the laser plugs are better because there's less electrical resistance. So when the plug's electrical requirements are lowered u'll get a stronger spark assuming the wires are good. Seems plausible and since i'm staying with NGK they have laser welded iridium and platinum plugs designed to meet or exceed OEM specs.

I believe that there's more than just getting coppers and i wanna try something new. Most likely i will try the laser welded iridium plugs from NGK and let u guys know how they do.

John

Copper is a better conductor and it's cheap. You're not even running boost or high compression that increases the resistance to spark, but it's your money.

wow pepole are still on this topic, your answer is right there what evolutionmovement siad!!!

555BCTurbo wrote:

92ss satinsvoice wrote: thats what the fools down at ralli-tek use some time.

I don't think I would refer to them as fools...


maybe you though

holy fuck that was intense.. i almost shit my self.

platnium & iridium just give you longevity. But as steve mentioned, copper is a better conductor

I run NGK BKR7E11, gapped at .028. 22+ psi daily and no issues. I change them about every 3k but a good amount of boost will do that to plugs. I've heard good things about J-gap plugs from some big tuners, but haven't looked into them yet.


When mine start to get worn I can feel the onset of misfires and its time to change them. Magnecore wires helped some, as Belkin wires are junk. I wish I had an option for a stronger coil pack/igniter.