Forced Induction Superchargers | Turbochargers | Intercoolers

Spark Plug Question

Thread Tools
 
Search this Thread
 
Old May 12, 2020 | 01:27 PM
  #1  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default Spark Plug Question

Swapped plugs out after a couple hundred miles on the new hotside/ECU and to me, the plugs seem to be too cold for the engine.

I had TR6 plugs in it prior, but switched to the BR7EF, gapped at .025

Spark Plug Question-q6zavinl.jpg

Thoughts?
Reply
Old May 12, 2020 | 05:31 PM
  #2  
forcd ind's Avatar
TECH Veteran
15 Year Member
Liked
Loved
Community Favorite
iTrader: (7)
 
Joined: Sep 2007
Posts: 4,188
Likes: 292
From: woodbine, md
Default

Rich tune? I dont see a lot of diff bet. my 6's and 7's.
Reply
Old May 12, 2020 | 05:35 PM
  #3  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Pic is useless. Need up close of the ground strap, need pics of the porcelain, pics of the threads showing heat.
Reply
Old May 12, 2020 | 09:05 PM
  #4  
tblentrprz's Avatar
TECH Fanatic
 
Joined: Feb 2015
Posts: 1,080
Likes: 178
Default

Fueling needs work and maybe a little timing. Pump gas? Was car re-tuned with new ECU? What is the target AFR at idle and cruise? Have you run a WOT pull with a new plug to see what's going on?
Reply
Old May 13, 2020 | 06:50 AM
  #5  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default

Originally Posted by forcd ind
Rich tune? I dont see a lot of diff bet. my 6's and 7's.
14.0 afr commanded at idle.

Originally Posted by ddnspider
Pic is useless. Need up close of the ground strap, need pics of the porcelain, pics of the threads showing heat.
If I was asking about WOT stuff, this is just asking about the sooty/carbon on plugs from a few hundred miles of daily driving.

Originally Posted by tblentrprz
Fueling needs work and maybe a little timing. Pump gas? Was car re-tuned with new ECU? What is the target AFR at idle and cruise? Have you run a WOT pull with a new plug to see what's going on?
Pump 93, target afr is 14.00 at idle and cruises at 14.5, WOT is 11.5 but have not done a WOT pull
Reply
Old May 13, 2020 | 06:54 AM
  #6  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by Shownomercy
...
If I was asking about WOT stuff, this is just asking about the sooty/carbon on plugs from a few hundred miles of daily driving.

...
Ah, my fault. Seemed kind of obvious its way rich at idle/cruise so I thought you were asking about WOT.
Reply
Old May 13, 2020 | 07:47 AM
  #7  
forcd ind's Avatar
TECH Veteran
15 Year Member
Liked
Loved
Community Favorite
iTrader: (7)
 
Joined: Sep 2007
Posts: 4,188
Likes: 292
From: woodbine, md
Default

Curious how the TR6's looked in comparison, they make an extended tip BR7EFS. You might be able to lean it out some, more in the idle, low speed area.
Reply
Old May 13, 2020 | 08:34 AM
  #8  
SE-R Spec's Avatar
TECH Enthusiast
10 Year Member
iTrader: (2)
 
Joined: Jan 2011
Posts: 541
Likes: 32
Default

How big is your cam and what timing are you running at idle? MAP Kpa?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old May 13, 2020 | 08:43 AM
  #9  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default

227/227 114, 25* at idle, 47kpa
Reply
Old May 13, 2020 | 08:48 AM
  #10  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

plugs shouldn't look like that with negative overlap. Have you put the wideband in both banks to confirm they agree? Why are you setting idle at 14.0?
Reply
Old May 13, 2020 | 08:51 AM
  #11  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default

No provisions for widebands in each bank, single wideband for the holley in downpipe. But, that was a worry of mine, until all the plugs came out the same.

I could bump idle AFR a little, just started tuning it with remote tuner and I expressed I wanted it to be a conservative tune.
Reply
Old May 13, 2020 | 08:59 AM
  #12  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Set it to idle at 15:1. Check the plugs again in a couple hundred miles.
Reply
Old May 13, 2020 | 10:36 AM
  #13  
tblentrprz's Avatar
TECH Fanatic
 
Joined: Feb 2015
Posts: 1,080
Likes: 178
Default

I would show plugs to tuner. Is he targeting peak vacuum by adjusting fuel and timing at idle and cruise?
Reply
Old May 13, 2020 | 11:39 AM
  #14  
squarles67's Avatar
TECH Regular
10 Year Member
Photogenic
Photoriffic
Shutterbug
 
Joined: Jun 2013
Posts: 487
Likes: 6
From: Orange, Texas
Default

Agree with others you need to lean out the idle and cruise a bit.

Don't know what boost you plan to run but a 3177 plug is a non-projected plug - NGK-BR6EF
Reply
Old May 13, 2020 | 11:47 AM
  #15  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default

Not sure on what exactly the tuner was looking for, car drives great so far. I will ask about the idle vac/timing/afr

Hoping to max out my turbo so 15-20psi
Reply
Old May 14, 2020 | 09:43 AM
  #16  
mightyquickz28's Avatar
TECH Addict
20 Year Member
iTrader: (8)
 
Joined: Feb 2003
Posts: 2,145
Likes: 133
From: East Chatham, New York
Default

Drag racing spark reading guide
Reply
Old May 14, 2020 | 02:46 PM
  #17  
Forcefed86's Avatar
8 Second Club
15 Year Member
Liked
Loved
Community Favorite
iTrader: (4)
 
Joined: May 2011
Posts: 8,482
Likes: 1,026
From: Wichita, KS
Default

Pump gas?

Not much to read on a plug that's been in the engine a couple hundred miles. If your cruise and idle are as lean as you can go and the AFR checks out at 11.3 to 12.5 during a WOT pull, its fine. If your putting in a new set do a quick pull and shut the engine down.... then pull the plugs to get a good read them. Even a few minutes at idle or cruise can muddy up a good plug reading. May add a simple inexpensive washer fluid injection kit. It will clean the CC/plugs quite a bit and has other benefits.
Reply
Old May 14, 2020 | 05:59 PM
  #18  
Shownomercy's Avatar
Thread Starter
Man-Crush Warning
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (1)
 
Joined: Jun 2009
Posts: 3,196
Likes: 129
Default

Yea regular 93 stuff.

I have the parts to spray water/meth but never bothered to use em so took it all off the car.

Reply
Old May 14, 2020 | 06:27 PM
  #19  
ddnspider's Avatar
10 Second Club
20 Year Member
Liked
Loved
Community Favorite
iTrader: (26)
 
Joined: Aug 2004
Posts: 14,628
Likes: 1,778
From: FL
Default

Originally Posted by Forcefed86
Pump gas?

Not much to read on a plug that's been in the engine a couple hundred miles.
​​​ .....
bull honkey.
Reply




All times are GMT -5. The time now is 02:04 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE