Spark plugs for turbo - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

sosick · 04-13-2017, 12:26 PM

Quote:

Originally Posted by Tcoat

There are many threads on how to change the plugs without lifting the engine. With the right tools and girlie hands it is tricky but can be done.

Yea just figured it out, the birds have to chirp, the sun has to be up and u have to have your tounge on the roof of your mouth.

On a second note...do not follow the full race spark plug guide. They tell u to put a ngk bkr9eix plug in...but that plug has a 14mm thread pitch and stock is 12mm. FML AND FU FULL RACE!!!

empower-auto · 04-13-2017, 02:39 PM

Quote:

Originally Posted by whitefrs

Great info by @2forme

First thing -- the OEM plug is a 9 heat range plug.

Next, you don't NEED to change it by your rule.

I'm 150+ whp over stock and on an HKS plug in the OEM 9 heat range -- no issues.

GsxrMe · 04-15-2017, 09:53 PM

Sorry I have to chime in on this. Just heads up everyone. When boosting my Hayabusa I have to change my gap to .020 Also noted the WRX plug gap is .020

So why the %#$@ would we keep the gap at a wide .032??? This miss leading information can cause misfires, knocks and loss of horse power. Tuners will not share this information as they want you to use them. $$$$

As well... the BRZ fa20 motor is nothing more than an engine, please study gap to boost recommendations a crossed all boosted cars and bikes. You will learn something.

factory plugs gapped correctly will reduce knock and save your plugs, engine and give your car more balls.

Amputechture · 05-01-2017, 03:58 PM

Quote:

Originally Posted by GsxrMe

Sorry I have to chime in on this. Just heads up everyone. When boosting my Hayabusa I have to change my gap to .020 Also noted the WRX plug gap is .020

So why the %#$@ would we keep the gap at a wide .032??? This miss leading information can cause misfires, knocks and loss of horse power. Tuners will not share this information as they want you to use them. $$$$

As well... the BRZ fa20 motor is nothing more than an engine, please study gap to boost recommendations a crossed all boosted cars and bikes. You will learn something.

factory plugs gapped correctly will reduce knock and save your plugs, engine and give your car more balls.

Mind if I inquire what gaps you are running? I hear so many different things and not sure what exactly is misinformation. I know that sounds lazy of me to be spoon-fed an answer...if you could even point me in the direction of some sort of credible material to read up on I would appreciate it.

GsxrMe · 05-02-2017, 08:53 AM

Quote:

Originally Posted by Amputechture

Mind if I inquire what gaps you are running? I hear so many different things and not sure what exactly is misinformation. I know that sounds lazy of me to be spoon-fed an answer...if you could even point me in the direction of some sort of credible material to read up on I would appreciate it.

.024 w/ OEM dealer plugs. I really wish we had an access panel in the wheelwell, the sparkplug swap is a huge pain in the ass.

Glenncoco · 01-11-2018, 07:58 AM

Any one have the hks v3 kit. And use the 50003-M50HL spark plugs. Did you set the gap same as the stock plugs

Sent from my SM-N950U using Tapatalk

Amputechture · 01-11-2018, 02:14 PM

Quote:

Originally Posted by Glenncoco

Any one have the hks v3 kit. And use the 50003-M50HL spark plugs. Did you set the gap same as the stock plugs

Sent from my SM-N950U using Tapatalk

I am running a turbo set-up, but I am using those same plugs. They are pre-set to .028 if I remember correctly, and it is recommended to leave them there at the default gap.

Glenncoco · 01-11-2018, 02:25 PM

Quote:

Originally Posted by Amputechture

I am running a turbo set-up, but I am using those same plugs. They are pre-set to .028 if I remember correctly, and it is recommended to leave them there at the default gap.

Okay awesome and do you know what the stock ones were set at.

Sent from my SM-N950U using Tapatalk

Amputechture · 01-11-2018, 02:46 PM

.032

Glenncoco · 01-11-2018, 03:11 PM

Quote:

Originally Posted by Amputechture

.032

Okay awesome thanks bud.

Sent from my SM-N950U using Tapatalk

Amputechture · 01-11-2018, 04:44 PM

You're welcome. Good luck with your build!

Glenncoco · 01-11-2018, 05:07 PM

Quote:

Originally Posted by Amputechture

You're welcome. Good luck with your build!

Thanks. And good luck to you too

Sent from my SM-N950U using Tapatalk

Irace86.2.0 · 05-04-2018, 04:23 PM

I am around 60k miles and was going to swap plugs when I install my Harrop SC. I was thinking of going with the OEM plugs, but gapped smaller. I don't know what would be ideal, but it sounds like it could be anything between 0.020 to the stock 0.032. I will be at 11psi. If anyone has any suggestions that would be great. I know some have kept the stock heat range, or the stock plugs, or the stock gap. Seems like 0.026 on the stock plugs would be a good compromise.

Also, I have some of these which I think would make getting to the spark plugs easier:

https://www.harborfreight.com/3-piec...aps-67011.html

FRS Justin · 05-04-2018, 07:17 PM

710whp for a couple of years stock plugs no problem

04-15-2017, 09:53 PM	#73
GsxrMe Senior Member Join Date: Jul 2015 Drives: Late 2014 Subaru BRZ Location: Cape Coral, FL Posts: 557 Thanks: 20 Thanked 183 Times in 139 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Sorry I have to chime in on this. Just heads up everyone. When boosting my Hayabusa I have to change my gap to .020 Also noted the WRX plug gap is .020 So why the %#$@ would we keep the gap at a wide .032??? This miss leading information can cause misfires, knocks and loss of horse power. Tuners will not share this information as they want you to use them. $$$$ As well... the BRZ fa20 motor is nothing more than an engine, please study gap to boost recommendations a crossed all boosted cars and bikes. You will learn something. factory plugs gapped correctly will reduce knock and save your plugs, engine and give your car more balls. __________________ 2014 Subaru BRZ FBM Turbokit: GTX3076R - ECUTEK HRI FlexFuel tune - FBM 3" Turboback Exhaust - 550cc Injectors - Walbro 485 Fuel Pump - 4bar Map Sensor - FBM Oil Pan - ACT SB7-XTSS - AMSOIL all fluids - Forester XT Oil Cooler - Cusco engine, trans mounts - Whiteline rear differential bushings - Perrin shifter bushing - Firehawk 235/45/17 - AEM Failsafe

01-11-2018, 02:46 PM	#79
Amputechture Senior Member Join Date: Aug 2015 Drives: 2014 BRZ Location: FL Posts: 424 Thanks: 49 Thanked 143 Times in 111 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	.032 __________________ JDL Auto Design///Turboback///Enkei///*Tial///RSR///HRI* Tuned

01-11-2018, 04:44 PM	#81
Amputechture Senior Member Join Date: Aug 2015 Drives: 2014 BRZ Location: FL Posts: 424 Thanks: 49 Thanked 143 Times in 111 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	You're welcome. Good luck with your build! __________________ JDL Auto Design///Turboback///Enkei///*Tial///RSR///HRI* Tuned

05-04-2018, 07:17 PM	#84
FRS Justin Senior Member Join Date: May 2014 Drives: 2013 Asphalt FRS Location: San Antonio Posts: 994 Thanks: 693 Thanked 695 Times in 417 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	710whp for a couple of years stock plugs no problem __________________ Instagram FT86PROJECT9S Facebook FT86PROJECT9S 710whp

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01-11-2018, 07:58 AM	#76
Glenncoco Junior Member Join Date: May 2016 Drives: Ultramarine Location: Eastern Oregon Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Any one have the hks v3 kit. And use the 50003-M50HL spark plugs. Did you set the gap same as the stock plugs Sent from my SM-N950U using Tapatalk

05-04-2018, 04:23 PM	#83
Irace86.2.0 Senior Member Join Date: Mar 2017 Drives: Q5 + BRZ + M796 Location: Santa Rosa, CA Posts: 7,884 Thanks: 5,668 Thanked 5,805 Times in 3,299 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	I am around 60k miles and was going to swap plugs when I install my Harrop SC. I was thinking of going with the OEM plugs, but gapped smaller. I don't know what would be ideal, but it sounds like it could be anything between 0.020 to the stock 0.032. I will be at 11psi. If anyone has any suggestions that would be great. I know some have kept the stock heat range, or the stock plugs, or the stock gap. Seems like 0.026 on the stock plugs would be a good compromise. Also, I have some of these which I think would make getting to the spark plugs easier: https://www.harborfreight.com/3-piec...aps-67011.html

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