Spark Plugs and Boost
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Professional
Joined: Jan 2005
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Spark Plugs and Boost
How much do spark plugs affect boost, i recently changed my plugs with some NGK's gapped at .035 with my stage 2 w/o toys, and boost went down? this is the first time this happens. Boost was fine before i changed them, the sparkplugs were a year old and i changed them to help my fuel economy.
Can someone shed some light on this.
Can someone shed some light on this.
Captain
Joined: Oct 2005
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RE: Spark Plugs and Boost
What about gapping your plugs to a smaller gap when you up the boost? It's been suggested to me to gap a set at .38 since I'm spiking 17psi & holding 16psi. Any benefit at that psi?
R.I.P. Dusty (Retired Moderator
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From: Alamosa, Colorado (200 yards from the Rio Grande)
RE: Spark Plugs and Boost
Not doing anything fancy, just putting in some Champion Plats.....at .045 tomorrow along with an oil change ( Mobil-1 10w-30). It's been raining here for the last three months with no end in sight, so it's something to do to kill the time. It's NEVER been this wet or this cool in July in San Antonioinover 150 years.........so much for global warming......[:@]
Dusty
Dusty
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From: NY
RE: Spark Plugs and Boost
global warming actuallycan meancooler temps, not necessarily hotter. people assume that since the word "warming" is in the name.
anyway, gap plays a big part in idle and spark when adjusting boost levels, but it has no direct effect on how much boost you run. when you raise the boost it's always a good idea to close the gap. what gap you should run depends on the type of plug and your boost levels. most basic bolt on cars running coppers are good in the .035-.040 area, but each car is different so you might have to play with it a little to find the best gap for your perticular car. denso's come pre-gapped and are usually fine for the heat range (assuming of course that you got the correct heat range for your power levels). those you usually just have to double check that they are all the same and throw in the car. another major benefit of irridiums imo.
anyway, gap plays a big part in idle and spark when adjusting boost levels, but it has no direct effect on how much boost you run. when you raise the boost it's always a good idea to close the gap. what gap you should run depends on the type of plug and your boost levels. most basic bolt on cars running coppers are good in the .035-.040 area, but each car is different so you might have to play with it a little to find the best gap for your perticular car. denso's come pre-gapped and are usually fine for the heat range (assuming of course that you got the correct heat range for your power levels). those you usually just have to double check that they are all the same and throw in the car. another major benefit of irridiums imo.
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Professional
Joined: Apr 2006
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RE: Spark Plugs and Boost
ORIGINAL: PSI Chick
global warming actuallycan meancooler temps, not necessarily hotter. people assume that since the word "warming" is in the name.
anyway, gap plays a big part in idle and spark when adjusting boost levels, but it has no direct effect on how much boost you run. when you raise the boost it's always a good idea to close the gap. what gap you should run depends on the type of plug and your boost levels. most basic bolt on cars running coppers are good in the .035-.040 area, but each car is different so you might have to play with it a little to find the best gap for your perticular car. denso's come pre-gapped and are usually fine for the heat range (assuming of course that you got the correct heat range for your power levels). those you usually just have to double check that they are all the same and throw in the car. another major benefit of irridiums imo.
global warming actuallycan meancooler temps, not necessarily hotter. people assume that since the word "warming" is in the name.
anyway, gap plays a big part in idle and spark when adjusting boost levels, but it has no direct effect on how much boost you run. when you raise the boost it's always a good idea to close the gap. what gap you should run depends on the type of plug and your boost levels. most basic bolt on cars running coppers are good in the .035-.040 area, but each car is different so you might have to play with it a little to find the best gap for your perticular car. denso's come pre-gapped and are usually fine for the heat range (assuming of course that you got the correct heat range for your power levels). those you usually just have to double check that they are all the same and throw in the car. another major benefit of irridiums imo.
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Joined: May 2004
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From: NY
RE: Spark Plugs and Boost
it's not dependant on boost levels, it's dependant on power levels. what's your hp/tq?
general rule is one range colder for every 75-100hp over stock or one range for each major modification. you're not making 100hp over stock, and it's arguable that s2 is a "major" modification. you could probably though use a ITL16 (stock heat range)or a ITL20 (one colder). the 20's might be a better choice. don't gap them, just check that they're the same and throw them in. i have yet to have to gap a set of denso's and i've never had issues with blow out or rough idle.
general rule is one range colder for every 75-100hp over stock or one range for each major modification. you're not making 100hp over stock, and it's arguable that s2 is a "major" modification. you could probably though use a ITL16 (stock heat range)or a ITL20 (one colder). the 20's might be a better choice. don't gap them, just check that they're the same and throw them in. i have yet to have to gap a set of denso's and i've never had issues with blow out or rough idle.
Professional
Joined: Apr 2006
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From:
RE: Spark Plugs and Boost
ORIGINAL: PSI Chick
it's not dependant on boost levels, it's dependant on power levels. what's your hp/tq?
general rule is one range colder for every 75-100hp over stock or one range for each major modification. you're not making 100hp over stock, and it's arguable that s2 is a "major" modification. you could probably though use a ITL16 (stock heat range)or a ITL20 (one colder). the 20's might be a better choice. don't gap them, just check that they're the same and throw them in. i have yet to have to gap a set of denso's and i've never had issues with blow out or rough idle.
it's not dependant on boost levels, it's dependant on power levels. what's your hp/tq?
general rule is one range colder for every 75-100hp over stock or one range for each major modification. you're not making 100hp over stock, and it's arguable that s2 is a "major" modification. you could probably though use a ITL16 (stock heat range)or a ITL20 (one colder). the 20's might be a better choice. don't gap them, just check that they're the same and throw them in. i have yet to have to gap a set of denso's and i've never had issues with blow out or rough idle.
never been on a dyno, but will probably dyno before i do any more mods so i can see how much the future mods really add. i'd hope that i'm making an extra 50 hp at theflywheel over stock with the mopar tbe, o2 housing and s2? or at least be over the 300hp mark at the flywheel assuming that the real factory stock flywheel hp rating is around 260ish. but since i keep getting a variety of opinions as to what the actual hp rating is from the factory at the crank and wheels...and how much s2 really adds, it's hard to say. anyway, thanks for the info and i'll probably go with the ITL20's - maybe they'll helpthe rough idle that i've hadwith s0 and s2. and future mods will probably be s3 (w/o toys) larger fmic, true 3" (maybe perrin) exhaust, s3 o2 housing, mopar hd clutch and perhaps an air-fueltuning device.