Official Spark plug thread for boost.

[BioCin]

Before anyone says anything I have searched, and didn't find a part number, for any spark plugs.

Maybe we can get everyone to post what kind of plugs they run and what part number it is, and engine code, so people can use this info. I got the turbo sitting on the floor and it is waiting for plugs and a bov flange, and that is it.

Only post if you know the part #(ie. you have the box in your hand and know it exactly).

Thanks guys.

I have a ep w/ k20a3.

[CIVICBOOST]

03 Civic SI- Denso Iridium IK22, which are 1step colder than stock (IK20). I have a JRSC, and gapped the IK22's to .40in

[esmith13]

If you have a turbo WITH intercooler this is most likely what u want:

NGK V-Power Racing plugs.
Stock # 4091
Part # R5671A-7 (same heat level as stock)
Plug Gap: .030

I had a thread here with all the turbo plug info you could want - but it seems to have dissapeared.

The reason alot of turbo people use NGK's instead of Denso's is the NGK's withstand lean and rich conditions better without fouling out as often. SC people usually don't have half the tuning issues we do so Denso's work great for them. There is no difference between the two brands in quality or performance - just longevity with an imperfect tune.
Also most stage I and stage II turbo kits use the stock heat level (7). Alot if not all SC people go a step colder because their not intercooled and the cylindar temps get so much higher they need a colder plug to help prevent detonation.

hope that helps you.

Eric

[BioCin]

Yes I have the intercooler kit. I still haven't installed it yet I will get to it in a month or two. Thanks guys for the info.

[k20ImportTuner]

So what is the recommended spark plugs and heat level on a stage I kit(preferrably CN)?
If I recall correctly there were problems with some plugs that people used to use with the CN stage I, so I am just asking to recap. I searched btw... good enough search? idk

[esmith13]

Exactly what is in my existing post is STILL what most boosted peeps (and ALL CN peeps) use...

Best place to buy them currently is www.rockauto.com for approx $1.32 each sold in packs of four. Some people are paying as much as $4 per plug in stores - makes it well worth the $5 shipping - especially if you decide to buy a couple 4 packs at once.


Eric

[k20ImportTuner]

Ok, thanks.

[silverstreak]

Arent the ngk vpower spark plugs messing up some of the aftermarket electronics that are installed. Due to the fact of not having a resistor? And they also put unwanted stress on the ecu. Let me know if these claims are true or not.

[esmith13]

What are you talking about?!?!

Eric

[silverstreak]

http://www.hondata.com/techksparkplugs.html

I have seen a few threads about things going wrong when they accelerate. I am just making sure that what hondata is saying is true. I am trying to find the threads right now.

[esmith13]

Wow, cool info...

The CN recommended plugs are R5671A-7 (stock #4091).

That link to hondata you provided has a link to NGK's site about resistor plugs. That link refers to all NGK plugs with an "R" having that resistor.

Basically that means that the CN plugs do meet the requirements that Hondata references.

i.e.: You're fine. Good lookin out tho. :D


Eric

[silverstreak]

I am currently using the same plugs. Because I cant afford the correct ones right now. However; the v-power R5671A-7 stock#4091 are infact non-resistor plugs. If you look right on the front of the box, under where it says V-POWER, it says non-resistor. Its says this on the box that holds the four plugs, and not the individual boxes that hold the plugs themselves.

[esmith13]

hmmm, oh well... A year of usage without problems can' be wrong.

Are you using these plugs without boost??? That's a bad idea...

Eric

[silverstreak]

I have the revhard kit at 10psi with kpro. I really need 550cc injectors though. I was just hearing problems with aftermarket electronics while people were using these plugs. When they changed them out, everything went back to normal. I have not had any problems with them so far yet, but I am still going to get some better plugs with resistors soon. Even if they are a little pricey, I would like to have peace of mind.

[esmith13]

Excerpt from a discussion on CN's web forum:

ORIGINAL: Nology Website
Question:
So non-resistor spark plugs are better for performance?
Answer:
Yes. If you are looking for performance you want to use non-resistor spark plugs. A resistor is exactly what the word implies. When the spark crosses the point of resistance some of the spark energy is lost. A resistor is like an electronic obstacle and could be the cause for a weak spark. Non-resistor spark plugs deliver a more powerful spark.

I realize this dosen't directly comment on the interferance part... but apparently people willingly deal with that all the time to make more power...

Eric

[silverstreak]

Yeah, but thats for trying to get the most horsepower for racing. I have a daily driver that does not need top hp. Thats why I have kpro to tune for what I have.

[esmith13]

Haha, different strokes for different folks then, man...

This is my daily driver too. 18k miles in the past 14 months turbo'd. All 18k on these plugs...


Eric
__________________
Not having a Signature is ghey. :ghey:

[k20a3]

ok so if you are FI intecooled recommended are either ik22 or 4091 plugs, but like in my case that i don't have a intercooler, it's just the basic greddy turbo kit with a type s blow off valve would the stock plugs work better than the ik22 or 4091 or other plugs that are one step colder?

[esmith13]

if any difference, colder would be MORE important for you... especially if your up the boost without an intercooler...

E.

[k20a3]

[B]i plan to put a intercooler later but for right now what it is reccommended for my aplications, factory plugs or still go one step colder.

[esmith13]

it's kinda your choice, but if you keep stock plugs you would have to still narrow the gap some.

E.

[aspec04t]

the only way to go are NGK Iridium IX stock number 2668.

[03ephatch]

03 Civic SI- Denso Iridium IK22, which are 1step colder than stock (IK20). I have a JRSC, and gapped the IK22's to .40in

is this on a race kit or street kit? i was told stock plugs will do for now. would you recommend ik22's with a wider gap, such as yours, on a street kit?

btw, side question, my engine light flashed for about 5 seconds or so when i was downshifting to 4th going 60mph on the freeway. i haven't seen it again since then (that was yesterday afternoon). my kit is newly installed, used for 17k from another member. i'm afraid of detonation/ knock. sorry for jacking.

regards

PS. anyone who's knowledgeable about JRSC's charger can chime in.

[i3igpete]

NGK iridium, BKR7E-IX (or 8 if you need even colder)

on my nitrous accord, another guy's nitrous accord, and several 3/S guys as well. the true beauty of iridium is that you can run stock gap when running high boost without getting spark blowout.

[aloandnina]

wrote rev hard and they replied with "You need to go 1 or 2 steps colder. NGK is usuallly higher number means colder. You need to gap it between .024" to .026"

[WPB EP3]

I would love to get some more explanations before I upgrade my Guardian unit to a K-Pro. So far I plan on using "non-resistor plugs" because I dont believe interference will be a genuine concern. Not to mention the low cost of these plugs. Depending on tuning, I'll look into a step or 2 colder.

[k-series]

Doesn't Hondata recommend against those plugs?


Steve

[WPB EP3]

Yes they do, because we have a distributoless ignition there is no resistor. So Hondata says you should have one or else interference may cause complications. I'm confused since there are healthy arguments stating it doesnt matter much. I might as well use what Hondata recommends if I am using their product I suppose.

Anyone have the part number for the plugs I want/should use?

[WPB EP3]

I recieved Kpro in the mail today. Using non-resistor plugs is a bad idea after investing $$ in the Hondata reprogrammable ECU.

[k-series]

Seriously :)


Steve

[WPB EP3]

My instructions from Hondata read:

Non-Res. plugs can cause a large amount of electrical interference which may affect vechile electronics, including the ECU.

With words like "can" and "may" it seems like its not the end of the world, but heres why I'll change plugs.

1. Hondata doesnt research anything just to sound smart, they are serious.
2. Should be #1, but: Hondata's warranty will not cover damage to the ECU and/or programmable ECU circuit board from the use of low-imp. injectors, non-res spark plugs.

Definitely not taking any chances after such an investment.

[blackpearl169]

I'm about to install a JRSC street kit. I just want to keep it from detonation. Should I get the Denso Iridium IK22s? Are they overkill for just the street kit?

[onebadivtec]

I"m running a greddy turbo on a k20a2 and using NGK 2668 > They're pregapped, a bit smaller gap than oem and colder. THey're made for turbocharged rides. I got em from sparkplugs.com

[aloandnina]

how long do you go in between changing plugs on a boosted car? is it still around 60k

[k-series]

Every oil change I swapped out plugs.


Steve

[aloandnina]

every 3000?

[k-series]

When I was boosted by CN, that's how often I was doing it.

Steve

[Lucid Moments]

Thats nuts. I havn't changed the plugs on my car since the swap last summer. Nearly 20K, and I'm not going to swap until there is some indication of a problem. The damn things are just to expensive for the stock replacements.
I probably should pull them though to check their condition.

[k-series]

Not the ones that CN recommended. :)

Steve