Help me with spark plug gap - 3000GT/Stealth International Message Center

BigTyla · 10-21-2007, 10:33 AM

I'm running a stock TT conversion at 6 psi on NGK coppers BCP7ES, so they are the correct heat range. What gap are you guys running? I'm running the gap specified in the manual : .040. I'm getting a lot of knock under boost and suspect that this may be due to my spark plug gap as some helpful people have pointed out in another thread.

Any help is appreciated.

3000hybrid · 10-21-2007, 05:49 PM

I run .028 gap with NGK's one step colder. I get spark blow out badly at anything above .032. With a smaller gap your idle won't be quite as perfect as stock gap, but it should drive and boost fine.

Mr.3000 · 10-21-2007, 08:22 PM

3000 Hybrid is right. I run .030 so yea somewhere between 0.028 and .032 and you should be fine. Also how are your SMIC's doing? If they are getting heat soaked then that could also be contributing to the knock. I am going FMIC cuz I am tired of dealing with heatsoak, boost leaks and all that rubber tubing lol.

BigTyla · 10-22-2007, 09:04 AM

Quote:

Originally Posted by Mr.3000

3000 Hybrid is right. I run .030 so yea somewhere between 0.028 and .032 and you should be fine. Also how are your SMIC's doing? If they are getting heat soaked then that could also be contributing to the knock. I am going FMIC cuz I am tired of dealing with heatsoak, boost leaks and all that rubber tubing lol.

I am running the stock FMICs but I don't think heat soak is the problem since the knock occurs even when the motor is cold (albeit even more when it is warm).

I don't know - .030 seems pretty small for a stock conversion on 6 psi. I was considering trying .035ish which is a little smaller than the minimum suggestion in the shop manual.

J-Groove · 10-22-2007, 12:27 PM

I'd say go at least .030. I'm running on .030 right now and debating dropping down to .028.

-John

vr4operator · 10-22-2007, 12:37 PM

NGK's at .028. I had Iridiums at .031 and that worked, but I had tried .035 previously and got blowout at high boost. gotta tell yeah, first time it happened, scared the bejesus outta me....

BigTyla · 10-22-2007, 02:20 PM

Well hell, if that's what's working for you guys I guess I'll try it as well. It just seems so small.

chansigril · 07-20-2008, 09:00 AM

i run my plugs gapped at .030, any larger and at 15+ psi blowout occurs. this is with 13t's. currently coppers, once i get done tuning i'll be changing to the ngk irridium ix's and the gap will stay the same, .030.

Hannibalzero · 07-21-2008, 06:50 AM

Tyla, on 6psi I'd say shoot for .035. If you still get blowout, regap it down to .032 and try again. On 6psi, I run one step colder NGKs at .040 without blow out.

green-lantern · 07-21-2008, 06:55 AM

Quote:

Originally Posted by Hannibalzero

Tyla, on 6psi I'd say shoot for .035. If you still get blowout, regap it down to .032 and try again. On 6psi, I run one step colder NGKs at .040 without blow out.

Old thread my friend. I put the link in someone’s thread that wanted help with gap and someone posted in it.

10-21-2007, 10:33 AM	#1 (permalink)
BigTyla Resident rocket scientist Join Date: Nov 2002 Location: Auburn, AL Drives: '93 3000GT ATX TT Trader Rating: (174)	Help me with spark plug gap I'm running a stock TT conversion at 6 psi on NGK coppers BCP7ES, so they are the correct heat range. What gap are you guys running? I'm running the gap specified in the manual : .040. I'm getting a lot of knock under boost and suspect that this may be due to my spark plug gap as some helpful people have pointed out in another thread. Any help is appreciated. __________________ Topline Engineering - "Driven to Perfection" 1993 3000GT FWD ATX TT - daily<----------------------->1984 Nissan Maxima - project Topline Engineering ground wire kit

10-21-2007, 05:49 PM	#2 (permalink)
3000hybrid Forum user Join Date: Apr 2004 Location: Crestview FL Drives: 93 VR4, 97GT FWDTT Trader Rating: (48)	Re: Help me with spark plug gap I run .028 gap with NGK's one step colder. I get spark blow out badly at anything above .032. With a smaller gap your idle won't be quite as perfect as stock gap, but it should drive and boost fine. __________________ VR4-"FOR OFF ROAD USE ONLY" 97 FWDTT Mods SOHC to 3.1L TT swap, ATX to 5-SPEED GETRAG, TE04H DR-19T's,Wiseco Forged Pistons, Custom FMIC, RPS MAX Street clutch,Tial BOV, Walbro 255,Custom Magnaflow 3'' exhaust,ATR DP,Custom FMIC,ATR DP,Catless, 3SX crank pulley, Emanage/E01, Derale fan controller, PTE 550 inj, AEM UEGO wideband, Re-located Optima Red Top,Krank Vents, EGR Blockoffs, MMCD logger, Stillen pads, drilled rotors, EibachPro springs, 3SX intake, intake hard pipes, IPO SX AFPR, 99 lifters,99 rear garnish, Racing Hart MP3 wheels,Snow Stg 2D Meth injection/Safe inj, http://www.hesspower.com/racecar.html

10-21-2007, 08:22 PM	#3 (permalink)
Mr.3000 I love her▼ Join Date: Dec 2006 Location: Cary, NC Drives: T70 3000GT Trader Rating: (38)	Re: Help me with spark plug gap 3000 Hybrid is right. I run .030 so yea somewhere between 0.028 and .032 and you should be fine. Also how are your SMIC's doing? If they are getting heat soaked then that could also be contributing to the knock. I am going FMIC cuz I am tired of dealing with heatsoak, boost leaks and all that rubber tubing lol. __________________ Project Z11A:My T70 Build Courtesy of Piedmont Custom Motorsports

10-22-2007, 12:27 PM	#5 (permalink)
J-Groove vice prez: TPW Join Date: Apr 2000 Location: Rowlett, TX Drives: '95 3000GT 9:1 TT Trader Rating: (45)	Re: Help me with spark plug gap I'd say go at least .030. I'm running on .030 right now and debating dropping down to .028. -John __________________ --3Si# 592--ROTM Dec. '07--www.IPSMotorsports.net--www.3SX.com

10-22-2007, 12:37 PM	#6 (permalink)
vr4operator Cabana Boy Join Date: May 2005 Location: Corpus Christi, TX Drives: an EGO KLLR Trader Rating: (14)	Re: Help me with spark plug gap NGK's at .028. I had Iridiums at .031 and that worked, but I had tried .035 previously and got blowout at high boost. gotta tell yeah, first time it happened, scared the bejesus outta me.... __________________ "Got Turbo? Meet The Twins" Enhance Street Performance Car Domain Link My '71 Stingray and '94 VR4

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10-22-2007, 02:20 PM	#7 (permalink)
BigTyla Resident rocket scientist Join Date: Nov 2002 Location: Auburn, AL Drives: '93 3000GT ATX TT Trader Rating: (174)	Re: Help me with spark plug gap Well hell, if that's what's working for you guys I guess I'll try it as well. It just seems so small.

07-20-2008, 09:00 AM	#8 (permalink)
chansigril og Join Date: Apr 2001 Location: pennsylvania Drives: 93 stealth rt tt Trader Rating: (43)	Re: Help me with spark plug gap i run my plugs gapped at .030, any larger and at 15+ psi blowout occurs. this is with 13t's. currently coppers, once i get done tuning i'll be changing to the ngk irridium ix's and the gap will stay the same, .030. __________________ 93 stealth r/t tt: mildly modified, 12.4@109 94 stealth r/t na: used to drive, 13.9@100 03 ford focus se: beater

07-21-2008, 06:50 AM	#9 (permalink)
Hannibalzero H to the izzO Join Date: Jan 2003 Location: Northern VA Drives: Recklessly Trader Rating: (53)	Re: Help me with spark plug gap Tyla, on 6psi I'd say shoot for .035. If you still get blowout, regap it down to .032 and try again. On 6psi, I run one step colder NGKs at .040 without blow out. __________________