Spark plugs for turbo - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

whitefrs · 03-24-2013, 06:22 PM

Great info by @2forme

Quote:

Originally Posted by 2forme

SST = Special Service Tool.

Ok, so I did a lot of research this morning. Thought I would share my findings.

The OEM plug is a Denso ZXE27HBR8, which will tell us all about the design of the physical plug.

ZXE - Thread Size x Hex Size - 12mm x 14mm, .55mm Iridium
27 - Heat Step - Equivalent to an NGK 9, Champion 4.59, or Bosch 2
H - Thread Reach - 26.5mm
B - Electrode Design - Triple ground electrode
R - Resistor
8 - Gap - 0.8mm (.032")

Now, with that knowledge, we can "build" a spark plug to our needs. As a general rule of thumb, for every 75-100 hp of FI, you should go one step colder in your plug. This will be your biggest concern when finding a model to fit your needs. One step up in Denso land would be ZXE31HBR8.

Unfortunately, I haven't been able to find any equivalent plugs with those dimensions. Denso, themselves don't even list them. I think it was a completely new model. It's odd to find spark plugs with 26.5mm reach.

The guide to the Denso part number spec is here (pg 12).

NGK lists a spec here.

Hope this helps everyone

SmsAlSuwaidi · 03-24-2013, 08:26 PM

Need ? No, but you could if you do not mind lifting your engine

Sportsguy83 · 03-24-2013, 08:31 PM

Quote:

Originally Posted by SmsAlSuwaidi

Need ? No, but you could if you do not mind lifting your engine

Boom, MINDBLOWN... http://www.ft86club.com/forums/showp...1&postcount=20

This is regarding spark plug change, and I quote:

Quote:

Originally Posted by ANTI_LAG

I never had to jack the engine up at all, I pulled the plugs from the top. Used a 1/4 ratchet with a short 10mm to remove coil pack bolt then pulled those out then used a standard 14mm socket, slid that in, then used a short extension, push that in, then just barely stuck a 3/8 standard snap on ratchet on it. As long as the car is cold I can do a plug change in about 10 mins.

Work on a 300zx turbo and it makes this car a breeze...

SmsAlSuwaidi · 03-24-2013, 08:34 PM

Quote:

Originally Posted by Sportsguy83

Boom, MINDBLOWN... http://www.ft86club.com/forums/showp...1&postcount=20

This is regarding spark plug change, and I quote:

But but but I thought the cars manual said .... Argh nvm thanks for the info though

Blue86 · 03-24-2013, 08:58 PM

Quote:

Originally Posted by SmsAlSuwaidi

But but but I thought the cars manual said .... Argh nvm thanks for the info though

It does! great way to make money for the service department after the warranty is up for a spark plug change.

Huehuecoyotl · 03-24-2013, 09:37 PM

ok, what plugs am I gettin?

Coheed · 03-25-2013, 02:21 AM

The heat range code for these plugs is really cold already. I don't think it is necessary to change them, but you may want to remove them and gap them down a bit if you are experiencing spark issues with boost.

whitefrs · 03-25-2013, 07:41 PM

Thx guya

King Tut · 03-27-2013, 02:35 PM

Quote:

Originally Posted by Sportsguy83

Boom, MINDBLOWN... http://www.ft86club.com/forums/showp...1&postcount=20

This is regarding spark plug change, and I quote:

That did blow my mind. I was thinking about pulling mine to check them along with a quick compression check.

2forme · 03-27-2013, 02:37 PM

Quote:

Originally Posted by King Tut

That did blow my mind. I was thinking about pulling mine to check them along with a quick compression check.

How are you going to get a compression tester to "screw" in?

King Tut · 03-27-2013, 02:44 PM

Quote:

Originally Posted by 2forme

How are you going to get a compression tester to "screw" in?

I don't know about yours, but my compression tester has a flexible rubber hose that screws into the spark plug hole. Then I connect it to my gauge.

2forme · 03-27-2013, 02:52 PM

Quote:

Originally Posted by King Tut

I don't know about yours, but my compression tester has a flexible rubber hose that screws into the spark plug hole. Then I connect it to my gauge.

Mine does as well, but I don't know how effective it is at screwing in while at a near 90 degree angle.

Huehuecoyotl · 03-27-2013, 02:53 PM

Quote:

Originally Posted by 2forme

How are you going to get a compression tester to "screw" in?

how do shop techs do it>? I cant see it fitting, but I have clumsy hands

2forme · 03-27-2013, 02:54 PM

Quote:

Originally Posted by Huehuecoyotl

how do shop techs do it>? I cant see it fitting, but I have clumsy hands

They might have an SST.

03-25-2013, 07:41 PM	#8
whitefrs Love Boost!!!!!!!! Join Date: Jun 2012 Drives: Whiteout Scion FR-S Location: Long Island NY Posts: 3,612 Thanks: 429 Thanked 902 Times in 606 Posts Mentioned: 87 Post(s) Tagged: 3 Thread(s)	Thx guya __________________ ༼ つ ◕_◕ ༽つ I LOVE BOOST ༼ つ ◕_◕ ༽つ

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Coheed Senior Member Join Date: Jun 2012 Drives: DGM BRZ Limited Location: Seattle Posts: 813 Thanks: 209 Thanked 225 Times in 157 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	The heat range code for these plugs is really cold already. I don't think it is necessary to change them, but you may want to remove them and gap them down a bit if you are experiencing spark issues with boost.

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