IX 100whp tune plugs?
STOCK!!!
I have am even running with meth and 26psi and 385whp on the stock plugs for 20,000 miles now! No need for them unless you are going large.
I even gave one step colder plugs to my tuner, and he said it wasn't necessary. Stick with stock!
I have am even running with meth and 26psi and 385whp on the stock plugs for 20,000 miles now! No need for them unless you are going large.
I even gave one step colder plugs to my tuner, and he said it wasn't necessary. Stick with stock!
Ever heard the saying if it ain't broke don't fix it? That's how you should treat the plugs on your nine.
Ask your mechanic/tuner why they recommend a change if you aren't having problems.
Most people look for new plugs or gapping when they detect detonation or misfiring. There's no rule of thumb that says for every 100 whp gain you should drop a range. That would come from someone with old school mentality and probably shouldn't be wrenching on your EVO.
Running too cold a plug will cause fouling. Many times fuel will form deposits on the tip eventually gunking it up. The tip must be hot enough to burn away any fuel residue from attaching to the metal of the electrode tip. For those of you already running colder plugs you should pull them and see if they are carbon'd up.
If you want to attempt to see gains from plugs you should look into indexing them. Indexing is a "free mod" that can increase power, throttle response & fuel economy if done properly. The idea is to face the OPEN END of the spark plug electrode TOWARDS the intake valve(s). This theoretically increases the flow of air/fuel mixture to the area between the electrodes, making a stronger explosion and burning more of the mixture. There are multiple dyno charts showing benefits, although there are also naysayers to this "mod".
Indexing the right way takes time and is a trial and error thing with multiple plugs but I do it to all my race cars. I can't tell a difference but at least I did my part.
Ask your mechanic/tuner why they recommend a change if you aren't having problems.
Most people look for new plugs or gapping when they detect detonation or misfiring. There's no rule of thumb that says for every 100 whp gain you should drop a range. That would come from someone with old school mentality and probably shouldn't be wrenching on your EVO.
Running too cold a plug will cause fouling. Many times fuel will form deposits on the tip eventually gunking it up. The tip must be hot enough to burn away any fuel residue from attaching to the metal of the electrode tip. For those of you already running colder plugs you should pull them and see if they are carbon'd up.
If you want to attempt to see gains from plugs you should look into indexing them. Indexing is a "free mod" that can increase power, throttle response & fuel economy if done properly. The idea is to face the OPEN END of the spark plug electrode TOWARDS the intake valve(s). This theoretically increases the flow of air/fuel mixture to the area between the electrodes, making a stronger explosion and burning more of the mixture. There are multiple dyno charts showing benefits, although there are also naysayers to this "mod".
Indexing the right way takes time and is a trial and error thing with multiple plugs but I do it to all my race cars. I can't tell a difference but at least I did my part.
+1 Except indexing is old school too. There is some information somewhere that dictates to look at the threads of the plug. Apparently, 4 threads discolored up the plug is good and 5 is too hot, and 3 is too cold. I may be off by a thread, but it goes something like that.
Right, the census on here is to keep the stock plugs, which I would prefer, but my gut says if the guy tuning my car asks for the colder plugs give them to him!
How about this scenario. I put the colder plugs in for the tune and if in the future it starts to run bad change them to the stockers. Would I need a retune for this? Also, a lot of people have said that I do not NEED the colder plugs, but will it hurt to use them (Except the back pocket of course).
How about this scenario. I put the colder plugs in for the tune and if in the future it starts to run bad change them to the stockers. Would I need a retune for this? Also, a lot of people have said that I do not NEED the colder plugs, but will it hurt to use them (Except the back pocket of course).
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Joined: Nov 2007
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From: Trinidad
ohhh this is an argument 
i changed to stock plugs to Denso Iridiums IKH24s (stock gap) all i got is a 3" TBE and a tune on my IX.
its up to you, i switched cause i needed new plug anyways.
there is a good thread somewhere on plugs and when to change.
i changed to stock plugs to Denso Iridiums IKH24s (stock gap) all i got is a 3" TBE and a tune on my IX.
its up to you, i switched cause i needed new plug anyways.
there is a good thread somewhere on plugs and when to change.
LOL, I love this thread. Just call your tuner and ask why be wants to run a colder plug. I have run both stock and one step colder in the car, however even at higher boost levels
I have never experienced any problems. Try the good old Copper NGK stock heat range. They're cheap enough you can buy a box and change and change em every 3,000 miles. Someone help me out here as I can't remember the plug numbers.
I have never experienced any problems. Try the good old Copper NGK stock heat range. They're cheap enough you can buy a box and change and change em every 3,000 miles. Someone help me out here as I can't remember the plug numbers.