Evo 9 Spark Plug List, Also how to read plugs.
If using non copper plugs:
look at the very first post for your plug model # options (also brisk is an option as well)
Can we just say ~350whp start thinking about +1 colder
~400whp definately +1 colder
~450whp start thinking +1.5 to +2 colder
~500whp you should already know but your tuner should be
able to tell you
Be honest to yourself with your whp numbers or youll be wasting your time and money on colder plugs and just fouling them up.
If you just upgraded your ix turbo to something bigger and got it tuned you should be in the +1 area. ( there are tons of posts asking the exact same question and clearly havent read other posts) Otherwise a few simple bolt ons would better use stock heat range plugs.
With the gap question to sum up all of these pages:
It was my understanding you should always gap your plugs to what
makes sense in your car. Rarely does that match what the plug
manufacturer sets them at. You wont break the plug if you do it right
(its very simple)
~.024 +/- .002 seems to be the norm (manual i believe says .020-
.024) unless running high power (still might be .024 if you dropped
your plug heat range) or meth then ~.022 seems to be the way to
go.
with copper there doesnt seem to be any real answer to the heat range question yet but there is a preference to the 6 range copper plugs
IMO You will learn more about your car by reading what others have tried rather than asking because you will see what everyone has tried, what worked and didnt. Then if there isnt an answer that is the time to ask.
look at the very first post for your plug model # options (also brisk is an option as well)
Can we just say ~350whp start thinking about +1 colder
~400whp definately +1 colder
~450whp start thinking +1.5 to +2 colder
~500whp you should already know but your tuner should be
able to tell you
Be honest to yourself with your whp numbers or youll be wasting your time and money on colder plugs and just fouling them up.
If you just upgraded your ix turbo to something bigger and got it tuned you should be in the +1 area. ( there are tons of posts asking the exact same question and clearly havent read other posts) Otherwise a few simple bolt ons would better use stock heat range plugs.
With the gap question to sum up all of these pages:
It was my understanding you should always gap your plugs to what
makes sense in your car. Rarely does that match what the plug
manufacturer sets them at. You wont break the plug if you do it right
(its very simple)
~.024 +/- .002 seems to be the norm (manual i believe says .020-
.024) unless running high power (still might be .024 if you dropped
your plug heat range) or meth then ~.022 seems to be the way to
go.
with copper there doesnt seem to be any real answer to the heat range question yet but there is a preference to the 6 range copper plugs
IMO You will learn more about your car by reading what others have tried rather than asking because you will see what everyone has tried, what worked and didnt. Then if there isnt an answer that is the time to ask.
Recently tuned with mods in sig @ 352/363. should i go 1 step colder or stay with stock heat range? gapped at .022? on pump gas btw, 91 octane.
Last edited by shnuzz; Aug 31, 2010 at 01:27 PM.
Depends on mods...Id say with mods and at least 300whp they will be fine...they are very resistant to fouling and have a broader temp range compared to iridium or copper. But being one step colder than stock if you had a stock evo I would just stick to stock heat range.
Depends on mods...Id say with mods and at least 300whp they will be fine...they are very resistant to fouling and have a broader temp range compared to iridium or copper. But being one step colder than stock if you had a stock evo I would just stick to stock heat range.
how much you pay for them?
More Copper plug options? Please post!
So far I've written down these options but has anyone found more Copper options or running a colder Copper plug?
Non-Copper: More Expensive, Last Longer
NGK R7437-8 (1 step colder)
NGK R7437-9 (2 step colder)
Denso IKH24 (1 step colder)
Denso IKH27 (2 step colder)
Brisk ER12S (1 step colder)
Brisk ER10S (2 step colder)
Copper: Cheap, Shorter Lifespan
NGK LFR6A-11
Non-Copper: More Expensive, Last Longer
NGK R7437-8 (1 step colder)
NGK R7437-9 (2 step colder)
Denso IKH24 (1 step colder)
Denso IKH27 (2 step colder)
Brisk ER12S (1 step colder)
Brisk ER10S (2 step colder)
Copper: Cheap, Shorter Lifespan
NGK LFR6A-11
Just ordered a set of Denso 1 steppers from SparkPlugAuto.com. $33.50 shipped comes out to $8.37 each shipped. Never heard of the website but they let me use Paypal.
BTW, www.sparkplugs.com has a coupon code for 10% off Denso plugs I just verified although the prices are more expensive. Coupon: DEN1NOE
BTW, www.sparkplugs.com has a coupon code for 10% off Denso plugs I just verified although the prices are more expensive. Coupon: DEN1NOE
I would suggest 22thou, and go from there.
Plug gap (from 18 to 30thou) will make very very little (if any) difference in power
so I pretty much searched on the answer to my question and still can't find it. I didn't want to start another thread on this so I figured I'd bring this one back to life.. Need a little help here guys please.. I have a Evo IX with a BBK full on it making 385 to the wheels.. Has 19k on it and I bought with 17k.. I'm pretty sure the Original owner didn't change the plugs.. So I figured it was time.. I ordered a set of NGK ILFR7H Laser Iridium Spark Plugs. Now from what I read in all these pages the stock gap on these are .24??(I think).. So should I touch the gap on these when I put them in? or just drop them in??? Some were saying .26 or .25 from what I was reading.. anyone have a similar setup and gaped there plugs?? Need a little info here guys thanks...
so I pretty much searched on the answer to my question and still can't find it. I didn't want to start another thread on this so I figured I'd bring this one back to life.. Need a little help here guys please.. I have a Evo IX with a BBK full on it making 385 to the wheels.. Has 19k on it and I bought with 17k.. I'm pretty sure the Original owner didn't change the plugs.. So I figured it was time.. I ordered a set of NGK ILFR7H Laser Iridium Spark Plugs. Now from what I read in all these pages the stock gap on these are .24??(I think).. So should I touch the gap on these when I put them in? or just drop them in??? Some were saying .26 or .25 from what I was reading.. anyone have a similar setup and gaped there plugs?? Need a little info here guys thanks...
I'm at a different altitude than most of you, so my settings are irrelevant.
I'd measure/gap all of your plugs, make sure they're consistent. Install them and see. If you have missing under boost, tighten them up a bit. Be very careful not to damage/break them:
http://www.ngk.com/glossary.asp?kw=S...s?&manID=1&pt=
Try to find someone with a very similar setup to yours (same fuel, 91 or E85) and see what they've found works for them.
