Spark Plug Database - Colder Than Stock ( Stage 1&2 )

[Haltech]

This is a compiled database for spark plugs who's heat range is 1 and 2 stages colder than stock. Please add your plugs and we will update this thread.

Mazdaspeed Forums Spark Plug Index Database

Gap size - 0.26 - 0.32 | Preferred gap is between 0.26 to 0.28

Type and Specs on DISI 2.3l Spark Plugs: 14mm; 5/8 hex; 25mm reach; projected tip; resistor plug

Heat Range Conversion Chart

 
HKS 25 30 35 40 45 50 52.5 55
DENSO 16 20 22 24 27 31 32 34
NGK 5 6 7 8 9 10 10.5 11 

Spark Plug Manf & Part Numbers

• Denso Iridium
• itv-20 - Stock heat range
• itv-22 - 1 stage colder heat range
• itv-24 - 2 stage colder heat range
• itv-27 - 3.5 stage colder heat range

• HKS
• 50003-M35LF *Mazda MZR Engine* ; Mazda 3, Mazda 6, MX-5 '06 7 $22.97ea. - 1 Stage Colder Heat Range
• 50003-M40LF *Mazda MZR Engine* ; Mazda 3, Mazda 6, MX-5 '06 8 $22.97ea. - 2 Stage Colder Heat Range

• NGK IX Iridium
• NGK LTR7IX-11 (6510) - 1 Stage Colder Heat Range
• NGK ILTR6A-8G (3787) - Stock Heat Range

• Torque Master Spark Plugs
• SVTP8BR Stock Heat Range
• SVTP7YR 1 Stage Colder Heat Range

• Autolite Iridium
• Autolite Iridiums XP5364 - Stock Heatrange
• Autolite Iridiums XP5263 - 1 Step Colder

NGK Copper Plugs

LZTR4A-11 (5306)
LZTR5A-13 (4306)

[Alladin]

So I read all the post about plugs and have a question.

Is there any plug that is better for a stock engine? Will I notice any difference or should I keep what is in there now?

If I do change them, what should the gap be on a stock motor?

Thanks

And I apologize if I missed the answer in a thread somewhere.

[Alladin]

Anyone?

[bykeryder4life]

gap size is listed above just read. stock motor=stock plugs

[egbertnr]

IN the Focus community which have similar engines most all the guys that have turbo cars run copper core plugs, which in the ford world equates to Motorcraft copper cores, Copper is the best conductor and I can't see any gains being made from any high dollar plug. Correct me if I am wrong but I doubt anyone here has seen gains with any overpriced plug. IF so I would be happy to see the dyno.

[aaronc7]

the problem is no one has found any copper plugs.

If so i would be using some for sure

[MZRDISI4]

Would a step colder help with pre-ignition?

[phantomspeed3]

So I'm running a CAI, Catless TBE, and BOV what kinda plugs should I run? I live in Utah

[FWD=WWD]

gap sizing listed taken from which car? speed3 or speed6 (yes i know same engine.)

SU lists their plugs for the speed6 (under Mazdaspeed 6) with gap sizes of .44, .32, and a few are unlisted...

[ONLYA6]

I'm going to switch my plugs out again here in a few months (coming on 15k).. is anyone running 2 steps colder? Any better results? Deciding whether I should stick with 1 step or go to 2

[Haltech]

Originally Posted by ONLYA6 I'm going to switch my plugs out again here in a few months (coming on 15k).. is anyone running 2 steps colder? Any better results? Deciding whether I should stick with 1 step or go to 2

What are your mods? If you have every bolt on known to man and 20 psi+, i would go 2 stage colder.

[phantomspeed3]

no one wants to answer me

[Scottybones]

, Copper is the best conductor and I can't see any gains being made from any high dollar plug. Correct me if I am wrong but I doubt anyone here has seen gains with any overpriced plug. IF so I would be happy to see the dyno.[/QUOTE]

Actually, copper conducts well, but there are definitely better conducting metals out there. Copper is the cheapest out of them all. Gold and platinum, and iridium come to mind. Iridium plugs actually outperform copper and last a hell of a lot longer.

[Clean Baldy]

I found a set of six(6) ITV22 spark plugs on ebay for only $58 with free shipping. They're labeled for an '08 Chevy Equinox Sport, however, one ITV22 plug is the same as another.

Just wanted to toss a heads up for anyone wanting them, worried about breaking one oin a set of 4 when they re-gap. Now, you get two extras... just gap them and install

I haven't seen them cheaper anywhere else. If you have, post up.

[Decepticon]

do you need to flash the ap or reset the ecu after installing a set of upgraded spark plugs?

[jkunze]

Originally Posted by Decepticon do you need to flash the ap or reset the ecu after installing a set of upgraded spark plugs?

No

[morgan2112]

Originally Posted by Clean Baldy I found a set of six(6) ITV22 spark plugs on ebay for only $58 with free shipping. They're labeled for an '08 Chevy Equinox Sport, however, one ITV22 plug is the same as another. Just wanted to toss a heads up for anyone wanting them, worried about breaking one oin a set of 4 when they re-gap. Now, you get two extras... just gap them and install I haven't seen them cheaper anywhere else. If you have, post up.

I am putting a set of ITV22 in my 06 Speed6.
I am almost fully bolted except no DP. Anyway COBB and my AccessPort recommends .25 to .28 for GAP..NOt .31 & .44 What is correct???? Does anyone know what these ITV22's come gapped at?? THX

[TiGraySpeed6]

few more for the list-


-not meant to indicate the best or favorite, it's just a list.

based on US dollars
- from various on-line parts stores, prices will vary widely
=============================================


Colder Heat Ranges
generally accepted gap, where adjustable, .028 (range .028 to .032)
====================
>Autolite Single Platinum Spark Plug
Part No. AP5263
$2.50

>Autolite Double Platinum Spark Plug
Part No. APP5263
$4.00

>Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug
**Cross-references the Denso ITV-22**
Part No. XP5263
$6.50

>NGK IX Iridium
Part No. LTR71X-11
$8.00 ea.

>Denso Iridium Spark Plugs
Part No. ITV22 - one step colder
$11.99 (streetunit price)

Part No. ITV24 - two steps colder
$11.99 (streetunit price)



Factory Heat Range
generally accepted gap, where adjustable, .032 (range .028 to .032)
====================
>Autolite Double Platinum Spark Plug
Part No. APP5364
$3.99

>Champion Double Platinum Spark Plug
Part No. 7437
$4.29

>Motorcraft Original Equipment Finewire Single Platinum Spark Plug
Part No. SP432
$4.69

>Motorcraft Original Equipment Finewire Double Platinum Spark Plug
Part No. SP478
$4.69

>Bosch Platinum+2 Spark Plug
Part No. 4315
$4.99

>Bosch Platinum Ir Fusion
Part No. 4515
$5.71

>Bosch Platinum+4 Spark Plug
Part No. 4488
$5.99

>Pulstar Platinum Pulse Plug
Part No. EF1P
$9.99

>ACDelco Professional Platinum Spark Plug
Part No. 41-814
$6.49

>Champion Iridium
Part No. 9901
$5.74

>NGK Premium Iridium
Part No. ILTR6A8G
$9.94

>Autolite Xp (Xtreme Performance) Iridium Enhanced Fine Wire Spark Plug
Part No. XP5364
$6.59

>Pulstar Iridium Pulse Plug
Part No. EF1I
$12.99

>E3 Premium Special Electrode Automotive Spark Plug
**reports of exceedingly poor performance in the MS6**
Part No. E3.66
$5.99

[Amazon]

I know most of us have, or plan on going with the Denso ITV-22's. The NGK's are problematic to gap correctly as they come preset at .44, a member fought with trying to gap them before giving up.

I got my densos from http://www.sparkplugauto.com/denso/i...park-plug.html for $7.44 a piece.

[myt_tuf1]

Here's a great article on why and when you should go "colder": NGK.com

[bozzben]

Originally Posted by Amazon I know most of us have, or plan on going with the Denso ITV-22's. The NGK's are problematic to gap correctly as they come preset at .44, a member fought with trying to gap them before giving up. I got my densos from Denso Iridium Power ITV22 Spark Plug for $7.44 a piece.

Tx for the link!

[Jkelley]

with my mods currently and the future mods i plan to get in the near future.. what plugs should I get? ITV22 or ITV24?? or even itv27?

[karl-hungus]

^^^ itv49s all the way.

[Jkelley]

Originally Posted by pat failman ^^^ itv49s all the way.

Seriously..

[Downmented]

Originally Posted by Jkelley Seriously..

Read the article posted above and make your own decision. Its not something thats going to make a drastic difference so using one over the others isnt going to be better or worse for you. You have to make your decision on your own, its a spark plug not a turbo.

[Jammer]

I am confused. I have had both of these types of plugs recommended for
my 2006 Mazdaspeed 6. I am having difficulty justifying the 250% higher price for the
racing plug. Does anyone know why the Denso site http://www.densoiridium.com/find_part.php recommends IRL01-27 only for my car, when it recommends the other plug (ITV20) for the same engine in a different year?

[BlueDmnSpeed]

i was told that if you go 1 or 2 step colder heat range then you gotta tune for it. from what i am reading in hear as long as you just gap them to the stock recommended gap then you should be good.

is my assumption right or is what i heard correct? i need to change my plugs mods are below. trying to decide if i wanna get the NGK's Denso's or just install the new Autolite iridiums i have in the glove box. what is y'alls opinion?

[oh_yeams6]

On the COBB 1.08 BETA testing, Christian and the team are asking for us to
"install new Denso ITV22 spark plugs gapped at .025".

[theurgy]

People on this page have to be VERY clear when they mention gap sizes.

0.28" DOES NOT EQUAL 0.028".

Also to note, if you're measuring gap sizes, use feeler gauges and not those circle gapping gauges, they might damage Iridium plugs.

[theurgy]

Finally... people use mm and inches interchangeably.
What is the real value?

[aggierandy]

Additional manufacturers chart



Source in picture

[dgiannitakis]

Nice info

[redboat]

Haltech,

I've seen in a few threads, you recommend people to NOT use Denso plugs. May I ask why since a lot of people use them?

I need new plugs (1 step colder).....

Also anyone use XP5263's? How do you like them? I found some, but they aren't listed for any Mazda's or even Ford's.

[nickpratt]

So I hate to be that guy but here we go...why would you go colder and not hotter? I read this whole thread and nobody said hotter. And what mods justifies going up a step or down a step?

[TiGraySpeed6]

A minute in Google, a lifetime on the brain.

More performance = more heat
When a plug heats up, after a certain point it can trigger a combustion event without spark. Colder plug transfers that extra heat more efficiently, preventing that stray combustion event and all the other problems & symptoms that come along with an overheated plug, such as shorter plug life.

Hotter plugs would only exacerbate the problems.

As a general rule, for every 50-100 HP added, go one step colder, but temper that with your driving style. You may not benefit from 2 step colder plugs if you spend your time in rush hour traffic as they may not get hot enough to burn off the deposits. If you have the power for it, but not the environment, then it's worth it to have two sets- one for daily driving and a colder set for the track.

[jm211]

Nicely put.

Also note that you want to run the hottest plugs you can without experiencing pre detonation from the plug.

[razerer]

I'm only getting confused by this. Cobb says gap needs to be 0.028 inches gap which translates to ~0.7 mm gap.. This says 0.28 gap, since I'm guessing that's in inches, 0.28 is much higher than 0.028. Can somebody confirm the actual gap for step colder plugs?

[TiGraySpeed6]

0.028 - 0.026, tighter as HP increases.

This is covered in the thread, have to read more than just the first post.

[theurgy]

Yeah that's a big pet peeve of mine when people say 0.28"
That 0 makes a HUGE difference.

[razerer]

Originally Posted by theurgy Yeah that's a big pet peeve of mine when people say 0.28" That 0 makes a HUGE difference.

I know! My gapping tool is in mm so I gapped it to 0.7mm car rubs fine on stage 2 so I'm guessing it was all good.. If it blows up I'll keep y'all posted