spark plugssss quick question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Diz86x · 07-22-2019, 06:54 PM

after a long track day today, I figured out that my OEM sparkplugs were ready to be replaced.

My question is, I was willing to replace them with HKS m45hl spark plugs!

so would I need to tune my car or it's fine and will work perfectly?

kev0 · 07-22-2019, 07:08 PM

Why not just stick with OEM? Even twins with 400hp+ uses OEM.

tomm.brz · 07-22-2019, 07:14 PM

do not change from oem if you aren t FI
and even if you are FI, do not change them if you aren t tracking it really hard

humfrz · 07-23-2019, 09:17 PM

How many miles on your original plugs?

How do you figure they need replaced?

humfrz

Tonrogs · 07-23-2019, 10:43 PM

Stick with OEM.

Diz86x · 07-26-2019, 04:22 PM

Thanks for the response guys i think ill stick with oem until i put on my turbo kit.

wparsons · 07-26-2019, 04:26 PM

Quote:

Originally Posted by Diz86x

Thanks for the response guys i think ill stick with oem until i put on my turbo kit.

Stick with OEM until your engine builder and/or tuner tells you to run something different. Just because you're adding a turbo doesn't mean you need different plugs.

Tonrogs · 07-26-2019, 05:11 PM

Quote:

Originally Posted by wparsons

Stick with OEM until your engine builder and/or tuner tells you to run something different. Just because you're adding a turbo doesn't mean you need different plugs.

exactly. I just put in a built motor with turbo. OEM plugs.

scion fr-s · 07-27-2019, 02:07 PM

Quote:

Originally Posted by Diz86x

after a long track day today, I figured out that my OEM sparkplugs were ready to be replaced.

My question is, I was willing to replace them with HKS m45hl spark plugs!

so would I need to tune my car or it's fine and will work perfectly?

I am running HKS! I would get them.

soundman98 · 07-27-2019, 02:15 PM

sparkplugs are a voodoo art. unless you're on a very custom tune, and inspecting plugs after every run, it's better to stick with stock.

when i was a teenager, i knew better on how to maintain my chrysler lebaron than my grandfather, who was a chrysler service manager for 40 years, the last 10 years of which were when the lebaron existed. so despite everything he said, i installed splitfires for MORE POWAH.

the car barely ran, tried everything for 2 days trying to get it to stay idling. changed for the oem-spec champion plugs and it ran fine ever after.

don't deviate on plugs unless you know what you're doing, especially on these cars because the plugs are so hard to get to!

FunnyGopher · 07-27-2019, 08:39 PM

Quote:

Originally Posted by soundman98

... the plugs are so hard to get to!

This is no joke. I spent $86 (ha!) on new OEM plugs to replace my current ones after 60k miles. I've done all the other work to my car myself, so I wasn't about to change my ways with the spark plugs. I knew what I was getting into, especially knowing I wasn't in a position to lift the engine out of the car far enough, but I didn't know the extent. Took me ~11 hours overall. Now I was in no rush by any means, but the first plug took me nine hours, and the other three plugs took the remaining two hours. The combination of socket extensions that had to be used in a very specific order to get the plugs on and off because of the lack of room, holy carp.

Lantanafrs2 · 07-27-2019, 08:57 PM

Aren't you glad they chose the balance of an underpowered flat four?

soundman98 · 07-27-2019, 10:07 PM

Quote:

Originally Posted by FunnyGopher

This is no joke. I spent $86 (ha!) on new OEM plugs to replace my current ones after 60k miles. I've done all the other work to my car myself, so I wasn't about to change my ways with the spark plugs. I knew what I was getting into, especially knowing I wasn't in a position to lift the engine out of the car far enough, but I didn't know the extent. Took me ~11 hours overall. Now I was in no rush by any means, but the first plug took me nine hours, and the other three plugs took the remaining two hours. The combination of socket extensions that had to be used in a very specific order to get the plugs on and off because of the lack of room, holy carp.

I got spoiled doing plugs on my mom's suburban. I sat in the engine bay on the wheel arch, and used 1 3" extension...

humfrz · 07-28-2019, 02:59 AM

Quote:

Originally Posted by FunnyGopher

This is no joke. I spent $86 (ha!) on new OEM plugs to replace my current ones after 60k miles. I've done all the other work to my car myself, so I wasn't about to change my ways with the spark plugs. I knew what I was getting into, especially knowing I wasn't in a position to lift the engine out of the car far enough, but I didn't know the extent. Took me ~11 hours overall. Now I was in no rush by any means, but the first plug took me nine hours, and the other three plugs took the remaining two hours. The combination of socket extensions that had to be used in a very specific order to get the plugs on and off because of the lack of room, holy carp.

Yep, it used to be a 5 minute, 1/2 beer job.

humfrz

07-22-2019, 06:54 PM	#1
Diz86x Member Join Date: Jan 2015 Drives: GT86 Nur spec Location: oman Posts: 45 Thanks: 12 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	spark plugssss quick question after a long track day today, I figured out that my OEM sparkplugs were ready to be replaced. My question is, I was willing to replace them with HKS m45hl spark plugs! so would I need to tune my car or it's fine and will work perfectly?

07-23-2019, 10:43 PM	#5
Tonrogs Senior Member Join Date: Apr 2018 Drives: 2014 BRZ Limited, Satin White Pearl Location: WI, 53593 Posts: 106 Thanks: 10 Thanked 40 Times in 30 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Stick with OEM. __________________ '14 SWP BRZ 6MT \| FBM built 9:1cr engine w/ GTX3076R Turbo \| Mazworx CD009 trans swap \| EcuTek \| Jackson Racing Dual Oil Cooler/Radiator \| SPAL fans \| JDL 3" Dual Resonated OP/FP \| Perrin 3" \| Radium Dual Cans \| 18" Rota Titans \| M85 3.73 diff \| DSS 1k axles \| And more....too much more....ugh.

07-27-2019, 02:15 PM	#10
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,673 Times in 6,781 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	sparkplugs are a voodoo art. unless you're on a very custom tune, and inspecting plugs after every run, it's better to stick with stock. when i was a teenager, i knew better on how to maintain my chrysler lebaron than my grandfather, who was a chrysler service manager for 40 years, the last 10 years of which were when the lebaron existed. so despite everything he said, i installed splitfires for MORE POWAH. the car barely ran, tried everything for 2 days trying to get it to stay idling. changed for the oem-spec champion plugs and it ran fine ever after. don't deviate on plugs unless you know what you're doing, especially on these cars because the plugs are so hard to get to! __________________ "The time you enjoy wasting is not wasted time"

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07-22-2019, 07:08 PM	#2
kev0 Senior Member Join Date: Feb 2018 Drives: '14 Location: Midwest Posts: 485 Thanks: 246 Thanked 99 Times in 76 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Why not just stick with OEM? Even twins with 400hp+ uses OEM.

07-22-2019, 07:14 PM	#3
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	do not change from oem if you aren t FI and even if you are FI, do not change them if you aren t tracking it really hard

07-23-2019, 09:17 PM	#4
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,870 Thanks: 28,792 Thanked 31,819 Times in 16,427 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	How many miles on your original plugs? How do you figure they need replaced? humfrz

07-26-2019, 04:22 PM	#6
Diz86x Member Join Date: Jan 2015 Drives: GT86 Nur spec Location: oman Posts: 45 Thanks: 12 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks for the response guys i think ill stick with oem until i put on my turbo kit.

07-27-2019, 08:57 PM	#12
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Aren't you glad they chose the balance of an underpowered flat four?

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