wrd1972

iTrader: (12)

Currently making nearly 400RWHP NA with 11.2 CR. Never gonna see boost or juice.

I am using NGK TR6 spark plugs that are currently gapped at .045".

Is this the ideal plug gap I should run or should I change to .035" or something else?

mklinger

iTrader: (4)

I'd leave 'em at .045

TheDon619

iTrader: (4)

i gapped em for my 355 as stock .50

gregrob

iTrader: (8)

So now you make 400HP?

litch2004

iTrader: (1)

Just curious but why are you using the TR6 plugs instead of the TR55 if you are not throwing the bottle at it?

Wicked94Z

iTrader: (26)

because he's making 150 hp more than stock.... and why on earth would you use a tr6 for nitrous anyways?

gregrob

iTrader: (8)

cuz I hears on ls1teck it was cool yo

hvyss

I agree. Have used NGK TR6's for nitrous but really need a not projected plug with a heat range 7 or colder. I use the Autolite AR474's. On the TR6's leave the gap at .45-.50 for an N/A motor

quik95lt1

iTrader: (7)

When i Had my 355 with the same 11.2 CR I had TR6's gapped at .040 and the car ran absolutly mint ran 11.40 @ 121 in a 3450lb car. Of course cam differences will change your dynamic compression so you may have to play with it a bit but it should be around the .040 mark.

mdacton

iTrader: (3)

I use AR103 NA

wrd1972

iTrader: (12)

Please show me where I made this statement.

Why are you wanting to start trouble with these folks that want to contribute positively to the discussion?

kinglt-1

iTrader: (26)

I ran my 383 with tr6's gapped at .45(na), tr7 should gap at .38. If your running the bottle, bref7 at .32.

djjab57

iTrader: (17)

This may help you some
Copied from lsxnation.net Written by Chris from Nitrous Outlet

Spark Plug Reference Guide
** Note: Heat ranges are determined by NGK standards. Not all plug manufacturers follow the same guidelines **

*** Note: List is intended for reference only. Please consult with head mfg. and ignition mfg. for proper gap ***

**** Note: NGK IX and Denso plugs are Iridium ****

LT1
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .050
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Champion RS14YC6 (stock number 13); Denso IT-16 (stock number 5325)

Nitrous (one step colder)
Heat range: 6
Gap: .035 - .038
Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)

Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)


LT1 w/ AFR heads
Thread – 14mm
Reach – 3/4”
Socket – 5/8 hex
Seat – Gasket
Stock – MFG Recommendations
Heat Range: 9
Gap: Consult ignition mfg.
Plug: NGK 5672A-9 (stock number 7405); Autolite AR3910; Champion C59YC (stock number 792); Denso IQ27 (stock number 5315); Denso IQ01-27 (stock number 5708)(diagonal platinum ground); Denso IQ02-27 (stock number 5711)(horizontal platinum ground)

Nitrous (one step colder)
Heat Range: 10
Gap: Consult ignition mfg.
Plug: NGK 5672A-10 (stock number 7942); Autolite AR50; Denso IQ31 (stock number 5323)

Nitrous (two steps colder)
Heat Range: 11
Gap: Consult ignition mfg.
Plug: Denso IQ34 (stock number 5324)


LT1 w/ Trick Flow & Edelbrock Heads
Thread – 14mm
Reach – 3/4”
Socket – 5/8 hex
Seat – Gasket

Stock – MFG Recommendations: approx under 9:1 compression
Heat Range: 4
Gap: Consult ignition mfg.
Plug: NGK FR4 (stock number 5155); NGK BKR5EIX (stock number 6341); Autolite 3926; Champion RC12YC (stock number 71); Denso IK16 (stock number 5303)

MFG Recommendations: approx 10.5:1 compression
Heat Range: 5
Gap: Consult ignition mfg.
Plug: NGK FR5 (stock number 7373); Autolite AR3924 (Racing Plug); Autolite 3924; Champion RC9YC (stock number 2075); Denso K20PR-U (stock number 3145); Denso IK20 (stock number 5304)

MFG Recommendations: approx 11:1 compression
Heat Range: 8
Gap: Consult ignition mfg.
Plug: NGK R5672A-8 (stock number 7173); Autolite AR3911; Champion C63YC (stock number 796); Denso IQ24 (stock number 5314)

MFG Recommendations: approx 12:1 compression
Heat Range: 9
Gap: Consult ignition mfg.
Plug: NGK R5672A-9 (stock number 7405); Autolite AR3910; Champion C61YC (stock number 785); Denso IQ27 (stock number 5315)

MFG Recommendations: approx 13:1 compression
Heat Range: 9 - 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-9 (stock number 5238); Autolite AR3933; Champion C59CX (stock number 296); Denso IK27 (stock number 5312)

MFG Recommendations: approx 14:1 compression
Heat Range: 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-10 (stock number 5820); Autolite AR3932; Champion C57CX (stock number 295); Denso IK-31 (stock number 5321)

**NOTE: Use chart for static compression and adjust heat range for nitrous use accordingly.

kinglt-1

iTrader: (26)

Good post! I was all screwed up for a minute lol. I ran tr55's in my 383 gapped at .45, tr6's should be around .38 like stated above, 7's usually around .32.

quik95lt1

iTrader: (7)

Im at 13.9:1 CR and I found that the best plug for me was a BR7EF from NGK.....its a 7 on the heat range and im gapped around .032. Seems warmer on the range than that chart says. Shows that every application is different due to dynamic CR's.

mdacton

iTrader: (3)

color dnt matter.... read the fuel ring.

timing, I have ran the strap all the way down...it always makes the most HP closer to the center of the bend in everything ive ever done

wrd1972

iTrader: (12)

What chain stores have ar103's?
Please define and help me ID the fuel ring.

mdacton

iTrader: (3)

you dont need a 103 its a cold plug

Napa should have whatever you want or get it withing a day....

wrd1972

iTrader: (12)

I thought the 103 and he TR6 were essentially the same heat range according to what has been posted in this thread. Am I wrong?

mdacton

iTrader: (3)

why do you need a tr6?