getting new spark plugs hopefully...heat ranges?!?

SideWinderGX · 02-20-2007, 08:44 PM

k, test driving the 87 supra tomorrow then hopefully buying it on saturday. im obsessed with this car (probably not a good thing. i dreamt about driving it last night -.-) and was thinking about what i should buy first to make sure it runs great. obviously the headgasket problem will be sorted out very soon, it hasnt been done yet. HKS 1.2 mm gasket and arp studs, if i remember correctly (its in my other topic, ill look back again). but anyways, ive settled on some silicon hoses to replace the rubber ones for look and performance, and spark plugs.

iridium seems to be the way to go, but whats all this heat range stuff? im so confused haha. japanese plugs go up and american heat ranges go down, and you go down another level per ~85 HP, i dont know. could anyone explain this in lamens terms and tell me which are a great plug to buy? thanks haha

redmaro · 02-20-2007, 10:51 PM

N/A or Turbo?

SideWinderGX · 02-21-2007, 01:30 AM

o0o, didnt think thered be a difference. 1987 toyota supra turbo, apparently it has a swapped 92 turbo engine with 100k miles on it.

edit: its automatic too.

mrnickleye · 02-21-2007, 03:07 AM

http://www.answers.com/topic/spark-plug

http://en.wikipedia.org/wiki/Spark_plug

http://www.nightrider.com/biketech/s....htm#discussed

http://www.ngksparkplugs.com/techinf...s/techtips.asp

http://www.edelbrock.com/automotive/sparkplugs.html

http://www.centuryperformance.com/spark.asp

SideWinderGX · 02-21-2007, 03:15 AM

firstly, thanks for the tips. secondly, id like to verbally rip you apart for just posting a bunch of links to places that have information about spark plugs and not tell me what would be a good choice for a stock\BPU 87 supra....although the information is quite good, im reading it now.

could you throw some links towards me of some good quality and performance, but moderately priced plugs please? id rather not spend over ~200 dollars on 6 plugs, thats kind of a lot lol. thanks for the info again, too.

IHateHacks · 02-21-2007, 03:32 AM

If you read those articles they will explain exactly what spark plug heat ranges mean. Its complex and hard to explain with just words, pictures help.

Bottom line, unless you are running 300rwhp you need stock heat range plugs. If you run colder ones, you will foul them out.

NGK iridiums can be found here for $39+ shipping.

SideWinderGX · 02-21-2007, 03:37 AM

gotcha. that NGK linnk was the best one. god, its like a worrywarts nightmare :-X in order to get a colder spark plug, youd have to find out the temperature inside the cylinder (inside 500 and 800C is the best)...but how would you find that out? i think i read something about that in the first\second link, but didnt really tell me...basically, octane, compression, gap, plug elements, and timing all come into play, but im not sure how youd choose to go colder a level or two or three.

not saying im going to, but it wouldnt hurt to know

heeeey, thanks for the link. that says 40 bucks for a set of six...so the spark plugs at supraspeed.com arent for one, theyre for 6? haha i thought it was gonna cost me like three paychecks.

mrnickleye · 02-21-2007, 03:42 AM

We use only Autolite platinum plugs in every vehicle at my shop. Been using them for 30 yrs without a failure.

I have seen lots of failed plugs from Champion, Bosch, and those 'trick' ones.

Most of the techs that I respect (because they are very smart, and many have race cars), won't touch the two brands I mentioned.

Denso may be a good choice. I used them in my race motoX bikes. NGK is also a good choice.

Read those articles, as they discuss going colder plugs per a certain amount of HP increase.

SideWinderGX · 02-21-2007, 03:44 AM

i havent heard of those brands, so i probably wouldnt have bought them...but thank you for the heads up.

read the articles, very informative, ill read em over again tomorrow to make sure i remember all the info. i think its for every 75-100 HP you gain, you go down one cold level on your plugs. which i wont have to worry about for a while haha.

NGK iridiums are my first choice, they seem to be really popular and have great results, but ill keep my eyes peeled for any autolite platinums too.

IHateHacks · 02-21-2007, 03:45 AM

You'll know the temp inside the combustion chambers by inspecting the spark plug after you've run it. Basically the more power you make the hotter the temps and thats when you go to a colder plug.

It's not something to be worried about with a stock engine. You should be saving your money for all the parts and tools you are going to need for that head gasket, now thats what I'd be worring about.

02-20-2007, 08:44 PM	#1
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	getting new spark plugs hopefully...heat ranges?!? k, test driving the 87 supra tomorrow then hopefully buying it on saturday. im obsessed with this car (probably not a good thing. i dreamt about driving it last night -.-) and was thinking about what i should buy first to make sure it runs great. obviously the headgasket problem will be sorted out very soon, it hasnt been done yet. HKS 1.2 mm gasket and arp studs, if i remember correctly (its in my other topic, ill look back again). but anyways, ive settled on some silicon hoses to replace the rubber ones for look and performance, and spark plugs. iridium seems to be the way to go, but whats all this heat range stuff? im so confused haha. japanese plugs go up and american heat ranges go down, and you go down another level per ~85 HP, i dont know. could anyone explain this in lamens terms and tell me which are a great plug to buy? thanks haha

02-20-2007, 10:51 PM	#2
redmaro walbro fp Join Date: Mar 2006 Location: arizona Posts: 432	N/A or Turbo? __________________ MK3, Auto, Turbo.

02-21-2007, 03:07 AM	#4
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Maybe more than you want to know http://www.answers.com/topic/spark-plug http://en.wikipedia.org/wiki/Spark_plug http://www.nightrider.com/biketech/s....htm#discussed http://www.ngksparkplugs.com/techinf...s/techtips.asp http://www.edelbrock.com/automotive/sparkplugs.html http://www.centuryperformance.com/spark.asp __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

02-21-2007, 03:42 AM	#8
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	We use only Autolite platinum plugs in every vehicle at my shop. Been using them for 30 yrs without a failure. I have seen lots of failed plugs from Champion, Bosch, and those 'trick' ones. Most of the techs that I respect (because they are very smart, and many have race cars), won't touch the two brands I mentioned. Denso may be a good choice. I used them in my race motoX bikes. NGK is also a good choice. Read those articles, as they discuss going colder plugs per a certain amount of HP increase. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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02-21-2007, 01:30 AM	#3
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	o0o, didnt think thered be a difference. 1987 toyota supra turbo, apparently it has a swapped 92 turbo engine with 100k miles on it. edit: its automatic too.

02-21-2007, 03:15 AM	#5
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	firstly, thanks for the tips. secondly, id like to verbally rip you apart for just posting a bunch of links to places that have information about spark plugs and not tell me what would be a good choice for a stock\BPU 87 supra....although the information is quite good, im reading it now. could you throw some links towards me of some good quality and performance, but moderately priced plugs please? id rather not spend over ~200 dollars on 6 plugs, thats kind of a lot lol. thanks for the info again, too.

02-21-2007, 03:32 AM	#6
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	If you read those articles they will explain exactly what spark plug heat ranges mean. Its complex and hard to explain with just words, pictures help. Bottom line, unless you are running 300rwhp you need stock heat range plugs. If you run colder ones, you will foul them out. NGK iridiums can be found here for $39+ shipping.

02-21-2007, 03:37 AM	#7
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	gotcha. that NGK linnk was the best one. god, its like a worrywarts nightmare :-X in order to get a colder spark plug, youd have to find out the temperature inside the cylinder (inside 500 and 800C is the best)...but how would you find that out? i think i read something about that in the first\second link, but didnt really tell me...basically, octane, compression, gap, plug elements, and timing all come into play, but im not sure how youd choose to go colder a level or two or three. not saying im going to, but it wouldnt hurt to know heeeey, thanks for the link. that says 40 bucks for a set of six...so the spark plugs at supraspeed.com arent for one, theyre for 6? haha i thought it was gonna cost me like three paychecks.

02-21-2007, 03:44 AM	#9
SideWinderGX 3" Exhaust Join Date: Feb 2007 Location: Syracuse, NY Posts: 203	i havent heard of those brands, so i probably wouldnt have bought them...but thank you for the heads up. read the articles, very informative, ill read em over again tomorrow to make sure i remember all the info. i think its for every 75-100 HP you gain, you go down one cold level on your plugs. which i wont have to worry about for a while haha. NGK iridiums are my first choice, they seem to be really popular and have great results, but ill keep my eyes peeled for any autolite platinums too.

02-21-2007, 03:45 AM	#10
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	You'll know the temp inside the combustion chambers by inspecting the spark plug after you've run it. Basically the more power you make the hotter the temps and thats when you go to a colder plug. It's not something to be worried about with a stock engine. You should be saving your money for all the parts and tools you are going to need for that head gasket, now thats what I'd be worring about.