Spark Plug Gap

Reply Subscribe

Thread Tools

Search this Thread

Jun 17, 2009 | 12:10 PM

Spd-Kilz

Thread Starter

TECH Junkie

iTrader: (35)

Joined: Nov 2005

Posts: 3,424

Likes: 5

From: Rack City

Spark Plug Gap

I have a set of TR-55's that I'm putting in my car, and I'm wondering what kind of gap they should have.

'98 LS1
TFS 215's
VRD Cam
FAST 92

Jun 17, 2009 | 12:47 PM

5.3LJimmy

10 Second Club

iTrader: (10)

Joined: Jun 2004

Posts: 2,279

Likes: 1

From: Napoleonville, LA

.055"

Jun 17, 2009 | 01:12 PM

bullock081705

Teching In

Joined: Feb 2009

Posts: 13

Likes: 0

i thought it was .40

Jun 17, 2009 | 01:13 PM

bullock081705

Teching In

Joined: Feb 2009

Posts: 13

Likes: 0

i mean .040"

Jun 17, 2009 | 02:00 PM

slt200mph

TECH Senior Member

iTrader: (42)

Joined: Jul 2003

Posts: 7,067

Likes: 9

From: HOT'LANA, GAWJA

.055 is correct

Jun 17, 2009 | 02:33 PM

BriancWS6

10 Second Club

iTrader: (18)

Joined: Mar 2004

Posts: 3,910

Likes: 1

From: The Garage

With those mods its time to swap over to TR6s. With the 6s running all motor .038-.044 would be fine.

Jun 17, 2009 | 03:04 PM

bullock081705

Teching In

Joined: Feb 2009

Posts: 13

Likes: 0

well i have to reprogram cause i put a difffernt cam and bigger pistons but i went with .040 is that part the reason it running back

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

Verdad Gallardo

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

Pouria Savadkouei

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

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

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

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Jun 17, 2009 | 04:03 PM

$00T\A's Avatar$

00T\A

TECH Fanatic

Joined: Oct 2002

Posts: 1,286

Likes: 0

From: NW Houston,TX

I think you should run TR6's gapped @.040-.045
That's what I run.

Jun 17, 2009 | 06:44 PM

#10

BriancWS6

10 Second Club

iTrader: (18)

Joined: Mar 2004

Posts: 3,910

Likes: 1

From: The Garage

.040 gap on which plug? Your tune is most likely the culprit if you changed cams and didn't tweak it for the new bump stick.

Jun 17, 2009 | 06:48 PM

#11

slt200mph

TECH Senior Member

iTrader: (42)

Joined: Jul 2003

Posts: 7,067

Likes: 9

From: HOT'LANA, GAWJA

I change mine every 10,000-12,000 miles and only when I bumped the compression up to 11.5 did I switch to the TR6 ... I gap them at .050 and they look good before that with the stock compression I ran the TR55 plugs at .055 and they always looked good ... we all have our own poison so to speak ... after 189,000+ miles I have a pretty good feel for what works on this motor.

Jun 17, 2009 | 09:11 PM

#12

Spd-Kilz

Thread Starter

TECH Junkie

iTrader: (35)

Joined: Nov 2005

Posts: 3,424

Likes: 5

From: Rack City

Thanks! That's all very helpful!

Jun 18, 2009 | 05:55 AM

#13

$00T\A's Avatar$

00T\A

TECH Fanatic

Joined: Oct 2002

Posts: 1,286

Likes: 0

From: NW Houston,TX

I'm right around 11:1 scr and was advised to run the TR6's on my currant setup.
When I was cam only all I ran was the TR55's.

Jun 18, 2009 | 08:29 AM

#14

Spd-Kilz

Thread Starter

TECH Junkie

iTrader: (35)

Joined: Nov 2005

Posts: 3,424

Likes: 5

From: Rack City

Okay. I'm around 11.5:1, so I'm assuming I should also invest in some TR6's.

Jun 18, 2009 | 02:52 PM

#15

BriancWS6

10 Second Club

iTrader: (18)

Joined: Mar 2004

Posts: 3,910

Likes: 1

From: The Garage

General rule of thumb is when you increase base horsepower by ~100 it's time to go a step colder on the plug. Also, when increased cylinder pressure and/or temps are present, like high compression, or nitrous, it is also very advisable.

A lot of people want to keep the hotter plug because they think they will make more power, and this is just not the case.

Reply Subscribe

Spark Plug Gap

Spark Plug Gap

Trending Topics

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

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

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

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

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

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die