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06-14-2005, 01:56 PM
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#1
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Plug Gap - Informational Thread
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You want to **** me?
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Stock plug gap on the 5.0 is .052 +/- a couple thousandths. The larger plug gap will start easier and burn cleaner, however you may start misfiring at high RPM's. For N/A applications, a .042 is very common, and supercharged or nitrous applications a .030 is common.
Just thought Id share, I looked for this info for a while today, hopefully it helps someone else out.
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-14-2005, 03:29 PM
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#2
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Join Date: Jun 2003
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for supercharged/turbocharged, i generally see .032-.035, .030 might be a little too tight |
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06-14-2005, 03:49 PM
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#3
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15.3 Second V8 Killer Yo
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I have been recommended to use 0.35-0.38. I have read people ramble about using upwards of 0.45 on the cobras, but since they get hammered real fast on that, I am thinking they are wrong.
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2.2L KB Supercharger, 4#, Billetflow Single Blade TB, JLT Carbon Fiber RAI, Nazty Performance Ported Lower Intake, Bassani Midlength Headers, O/R H-Pipe, Borla Stinger Catback, Tuned by RWTD --- Numbers coming soon...
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06-14-2005, 03:50 PM
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#4
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Join Date: Jun 2003
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well, my information is based on a distributor car, with copper tip plugs
im not sure if the 03-04 Cobras, or DIS cars would require a different gap, and/or a plug other than a copper |
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06-14-2005, 03:58 PM
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#5
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You want to **** me?
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All i know is when I pulled my plugs today, the moron had gapped them at .030. When I replaced them, I gapped them at .042 and the car runs sooooo much better. Smooth all the way through the RPM bands, no more bucking me around without enough gas, etc. I dunon wtf the guy was thinking when he gapped at .030  2:
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-14-2005, 04:06 PM
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#6
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Registered User
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Stock gap is between 52-56 for n/a 42 is still to low. |
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06-14-2005, 08:58 PM
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#7
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i actually gapped my 3.8L plugs at .035 not thinking, it runs suprisingly well |
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06-14-2005, 09:43 PM
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#8
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You want to **** me?
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I just tried running my car up past 4500 RPMS, the thing died out on me... im gonna gap them at .034ish tommorow.
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-15-2005, 11:42 AM
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#9
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Registered User
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Zimstang 34 is way to small of a gap for n/a aplications. Looking at your mods listed the stock setting is what you will need, gap them at 54 (stock is 52-56). |
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06-15-2005, 12:03 PM
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#10
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You want to **** me?
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They were gapped at .030 when I pulled the old ones out, and it ran ok like that 
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-15-2005, 12:09 PM
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#11
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Registered User
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Supercharged/turbo stangs run them that low if they go any wider they will blow th spark out, but n/a needs some gap too small of a gap and it will not ignite(sp?) the air/fuel mixture. Do a search on stangnet/corral and you'll see you need some gap. |
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06-15-2005, 12:25 PM
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#12
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You want to **** me?
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I agree with you, I know it needs to be something different... I just dont understand why he had them gapped at 30 and then When i regapped them at 42 it misfires above 4500 RPMs
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-15-2005, 12:29 PM
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#13
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Registered User
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Last edited by wytstang; 06-15-2005 at 12:39 PM..
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06-15-2005, 02:20 PM
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#14
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what plugs are you using? |
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06-18-2005, 11:14 AM
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#15
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You want to **** me?
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__________________
-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-18-2005, 06:43 PM
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#16
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You want to **** me?
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im sick and fucking tired of these problems. Today I went and gapped them at .052, drove it in the low RPMs it was fine, hell it was even fine if I went in high rpms just not romping on the throttle... then i tried WOT runs, POP POP POP POP VROOOOOOOOOM without the "go" part of vroom. At 4k rpms, the POS backfired like it was its job, and then the rpms just flew up without my car having ANY power at all. WTF IS THE DEAL?? Is my timing fucked up? Maybe too advanced? I havnt touched anything to do with the timing... but I dont know wtf is wrong when Ive gapped the plugs at .030, .042, and .052 and the same problem occurs EVERY TIME. Anyone that has anything that might help me here... please let me know what I can do. Id like to drive this god damn car that I paid for sometime soon.
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-18-2005, 07:15 PM
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#17
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Kitteh!
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Do a complete tune up... replace the wires... could be arching.... dunno what else to tell you.. if its not one of those then if it has a chip in it that could be it... or its something internal? |
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06-18-2005, 07:20 PM
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#18
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You want to **** me?
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Ive replaced the plugs, and now wires, and it still does it. I dont think it has a chip in it... who knows though, I guess I could check.
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-18-2005, 09:41 PM
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#19
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Registered User
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Did you do any mods prior to this backfiring???
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Cooking Rice: Measure out 300+rwhp, add 1 tbsp. of blue oval, and 15" of MT's. Line up to rice and rapidly start smoking! Cook for 1320ft or until thoroughly done. 
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06-18-2005, 09:43 PM
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#20
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Kitteh!
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He bought the car with the mods listed. |
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06-18-2005, 09:48 PM
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#21
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You want to **** me?
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havnt done a thing to it besides these plugs.
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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06-18-2005, 09:57 PM
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#22
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Cammed Baby!
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Double check your timing just to be safe. |
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06-18-2005, 10:06 PM
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#23
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Registered User
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It sounds like you spark plug wires are failing under a load. Try putting the car under a load ex. ebrake on, one foot pressing on the brake using your heal while using your toes to press the gas. I had a 93 crown vic once that started missing/shuttering at 70mph only, I was servicing the tranny thinking that was it. Turned out the wires would fail while under a certain load it was weird.
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Cooking Rice: Measure out 300+rwhp, add 1 tbsp. of blue oval, and 15" of MT's. Line up to rice and rapidly start smoking! Cook for 1320ft or until thoroughly done.
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09-17-2005, 11:45 AM
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#24
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Re: Plug Gap - Informational Thread
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Registered User
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do you use a capacitive discharge ignition system?
i have a msd 6a and have opened the gap to .070 on my 347 stroker with 10.6 compression. That friggin ignition will send a spark over an inch out of the coil wire and scare the hell out of ya- |
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09-18-2005, 05:28 PM
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#25
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Re: Plug Gap - Informational Thread
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You want to **** me?
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holy jesus... whats with reviving all these ancient posts?
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-Mike
[ 2003 Lexus IS300 || 2003 CBR600RR || 1986 Mustang GT ]
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