I have the basic bolt ons on my 02 mustang GT.

I need to replace my stock 19# motocraft plugs.

I hear that if I go with a 1 step colder plug, it could be benficial. WHICH PLUGS and WHERE do I get the ones ya'll are usuing and like. Im staying w/ 19# ers

 

what do you mean by 19# plugs? The fuel injectors are 19#s maybe thats what you mean. For spark plugs if you want something 1 step colder than go with NGK TR6 plugs they are great. Stock plug part # is like AGSF22LM or something of that nature not 19#.

 

autolite 103's FTW.

If you actually mean injectors.. you don't need to replace them and they actually probably pink top 21/22lb injectors at that.

 

stock plug number is AGSF32PM, the 3 is the heat range if you want colder its AGSF22PM. but also the are a copper version AGSF32C also.

 

NGK TR6 is what I run.

 

I run Autolite 103s. They are really inexpensive. You really cant go wrong with NGKs or Autolites.

 

you dont need to swap heat rangs with a stock motor with no power adder. I would use NGK TR55's if i was you. There stock heat rang copper plugs.

 

Randy recommends 1 heat range cooler plugs for NA cars that race.

 

for any car that has bolt on perf parts and/or a tune that advances timing should run a 1 step colder plug. No you don't NEED to but it's a good idea. Our motors aren't being used as commuter cars by old women... we flog them hard and expect honda like reliability. Go a step colder.

 

What are you all gapping yours at? i am running Tr-6's @ .030. can you go any higher, lower? i know a wider gap puts more spark in the chamber, but then you got blowout and all that. whats the ideal gap?

 

I use .035" on my TR6's with nitrous.

 

cool, i amy try goin to .040. im not spraying yet, wont be until i get my new motor. see if this does anything...

 

42 on 103's.

 

I'm pretty sure I read something that NGK stated their plugs aren't meant to be gapped more than +.004 or -.004 (so if they are pre-gapped at .032 don't go more than .036) any more than that compromises the integrity of the plug

 

at www.NGK.com...which part # plug is it that I want? I basically want a plug that is 1 step cooler than my stock motorcraft plugs I have in now. I have a 02 GT with basic bolt ons.

 

TR6 is the name of the plug. at autozone or discount its part number 4177.

Colder then stock by one rang and copper.

 

ok I ordered that NGK tr6 plugz. What should they be gapped at? remember..I only have Basic bolt ons pushing about 290 at the wheels. Car will not see any forced induction or nitrous at all

 

Stock gap is fine. Look at the emissions decal for your car, it should tell you the gap there.

 

they come pregapped at .035 but i would open them to .045 atleast.

 

id go .055 but thats just me.

 

+1 On back to back dyno runs with just swapping out the plugs it added like 7 hp and 8 ft lbs of torque. Just from a 1 step colder plug. I was suprised, almost did more than my intake.

 

if they're copper then 40-45 should be fine.

 

This is straight from the NGK website

FAQs - Spark Plugs

Q: What is the maximum I can open or close the gap?

A: NGK doesn't recommend adjusting the spark plug gap < or > .008". The reason for this is the ground electrode and center electrode won't line up properly, hindering spark plug performance.



So if you want to use a stock gap, get stock plugs!

 

On the back side of the box the plugs come in....it says to "always set gap to manufacturers specifications, Refer to owners manual"

 

If that's for the Iridum plugs, then yes, you don't gap those.

 

its for teh TR6 copper plugs that say it on the box

 

Well, if you want to gap it to factory specs then go with a factory heat range. NGK TR6's are not meant to be gapped at .055 or whatever the factory spec is. And the info I posted from NGK is for all of their plugs, not one just the TR6's.

 

What about a N/A 4V?

 

I ran TR6's in my mach and gapped them at .034. The car ran fine, didn't notice any difference really. Then I went back to the stock heat range, but went with the TR55IX. I couldn't really tell any difference, but I think my car idles a little better with the TR55IX's. I will probably go back to TR6's when summer comes.

It might be a good idea to give NGK a call and see what they have to say about gapping the TR6's to factory specs....I was just posting what they said on their website, but if you talk to one of the tech guys over there he might say go for it...who knows.

 

i dont know why you would run a colder plug on a n/a stock motor. You want to use the highest heat rang possible without detotation. It helps it burn cleaner and less deposits etc... Me i would use tr55's or whatever the stock plug autolites are for a n/a stock bolt on motor.