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?

 

I'd leave 'em at .045

 

i gapped em for my 355 as stock .50

 

So now you make 400HP?

 

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

 

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

 

cuz I hears on ls1teck it was cool yo

 

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

 

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.

 

I use AR103 NA

 

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?

 

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

 

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.

 

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.

 

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.

 

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

 

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

 

you dont need a 103 its a cold plug

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

 

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?

 

why do you need a tr6?