Spark plugs for turbo - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Huehuecoyotl · 03-27-2013, 07:27 PM

whats that?

rice_classic · 03-27-2013, 07:44 PM

If I boosted my engine I would probably run one step colder. (Japanese plugs: Colder = bigger number)

A 7 is a colder plug than a 6 FYI.

2forme · 03-28-2013, 11:45 AM

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!

#87 · 03-28-2013, 11:52 AM

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:

Makes it sound easy I wish I could see a video of how easy it really was

Sportsguy83 · 03-28-2013, 12:19 PM

Quote:

Originally Posted by #87

Makes it sound easy I wish I could see a video of how easy it really was

I don't think its easy, I think it requires TONS of patience. I do think its easier than lifting up the engine!!

King Tut · 03-28-2013, 03:53 PM

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!

What is this trollish information you speak?

2forme · 03-28-2013, 03:58 PM

Quote:

Originally Posted by King Tut

What is this trollish information you speak?

Oh, sorry, let me translate...

Dude, Denso sucks ass. It sucks so much that other manufacturers haven't even made replacements for it. I bet that it costs like 20$ per plug from the dealer, too.

Just take your spark plugs out. Who needs that crap? You'll make more gains from the weight reduction alone.

...but really, it's 19.xx $ from the dealer.

King Tut · 03-28-2013, 05:49 PM

I'm an NGK guy myself. I find that the more linear powerband and less heat you get from NGKs over Densos is more than worth the lower horsepower number they ultimately produce.

Huehuecoyotl · 03-28-2013, 06:05 PM

if its not avail in NGK, I'm fine with denso quality

money is fine for the part, I just want to know someone else has done this ZXE31HBR8 before I buy it

Done ginea piggin for a minute

2forme · 03-28-2013, 06:21 PM

Gem, that model isn't made yet.

Drift-Office · 03-28-2013, 09:20 PM

Quote:

Originally Posted by 2forme

Gem, that model isn't made yet.

The spark plug? It is, but it's really pricey being a RACE plug. I don't think anyone really wants to pay about $90 per plug. We'll test some out real soon though!

Regards,

Bob @ Drift-Office, LLC

2forme · 03-28-2013, 10:01 PM

Quote:

Originally Posted by Drift-Office

The spark plug? It is, but it's really pricey being a RACE plug. I don't think anyone really wants to pay about $90 per plug. We'll test some out real soon though!

Regards,

Bob @ Drift-Office, LLC

Link? I couldn't find it on the google.

No Limit Motorsport · 04-10-2013, 11:30 PM

I have a customer running the HKS 50003-M45HL plugs, made by NGK with good luck. Not sure if they alone were an improvement though as we did a bunch of other things at the same time.

http://www.hks-power.co.jp/en/produc...ies/index.html

Evasive Motorsports · 05-20-2013, 02:50 AM

We are using the HKS fire on our own FR-S and S2000. They are great plugs!

03-27-2013, 07:44 PM	#16
rice_classic Senior Member Join Date: Jun 2012 Drives: Nevermorange FRS Location: Seattle, WA Posts: 4,173 Thanks: 757 Thanked 4,208 Times in 1,808 Posts Mentioned: 78 Post(s) Tagged: 1 Thread(s)	If I boosted my engine I would probably run one step colder. (Japanese plugs: Colder = bigger number) A 7 is a colder plug than a 6 FYI. __________________ SCCA T4 - FRS

03-28-2013, 05:49 PM	#22
King Tut NASA SpecE30 Racer Join Date: May 2012 Drives: 2006 Honda S2000 Location: Gulf Breeze, FL Posts: 7,279 Thanks: 607 Thanked 5,759 Times in 3,055 Posts Mentioned: 274 Post(s) Tagged: 10 Thread(s)	I'm an NGK guy myself. I find that the more linear powerband and less heat you get from NGKs over Densos is more than worth the lower horsepower number they ultimately produce. __________________ - King Tut Street/Track Car: 2006 Honda S2000 TT3 \|\| Race Car: 1987 BMW 325is SpecE30 \|\| Tow Vehicle: 2014 RAM 1500 EcoDiesel Sold Cars: 2012 BMW M3 \|\| 2013 Subaru BRZ \|\| 2012 Porsche Cayman R \|\| 2009 Chevrolet Z06 \|\| 2009 BMW M3 \|\| 2004 BMW M3 \|\| 2004 Nissan 350Z

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04-10-2013, 11:30 PM	#27
No Limit Motorsport Senior Member Join Date: Jul 2012 Drives: 2013 DGM BRZ Location: Long Island, NY Posts: 2,266 Thanks: 355 Thanked 406 Times in 228 Posts Mentioned: 27 Post(s) Tagged: 0 Thread(s)	I have a customer running the HKS 50003-M45HL plugs, made by NGK with good luck. Not sure if they alone were an improvement though as we did a bunch of other things at the same time. http://www.hks-power.co.jp/en/produc...ies/index.html

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