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Old 01-25-2008, 04:15 PM   #1
Rudywrx04
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Join Date: Dec 2006
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04 VF 48 P&P
289 WHP 275 WTQ

Default Stage 2 1 step colder plugs

I have been running stage 2 for about 30k miles with regular plugs. I installed 1 step colder iridium and all I can say is WOW! Seems to make the car run smoother and faster. Of course this is by my butt dyno. I know this is not Earth shattering news but for anyone who has not done it I would recommend it. I have about 70k on the car. Do you guys think this was just because they were new plugs or do the 1 step colder ones make that big of a difference? Maybe a combination of both.
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Old 01-25-2008, 05:00 PM   #2
CynicX
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Maybe the SLIGHTEST gains from swapping to one step colder without tuning the car for them. Probably if you are actually feeling a difference its because the old plugs were.....old.

Colder plugs reduce cylinder temp by better transferring heat into the head.

Now if the car retarded timing you could potential gain some back....like I said the slightest of gains with just installing plugs. You would have probably noticed the same results with the stock heat range plug esp. since the car is tuned for the stock range plugs. Colder plugs will foul faster and you'll get worse MPG (probably an un noticeable amount)....on the bright side you'll be less likely to have pre ignition and detonation....
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Old 01-25-2008, 05:05 PM   #3
AllAWD
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Default

Quote:
Originally Posted by CynicX View Post
Maybe the SLIGHTEST gains from swapping to one step colder without tuning the car for them. Probably if you are actually feeling a difference its because the old plugs were.....old.

Colder plugs reduce cylinder temp by better transferring heat into the head.

Now if the car retarded timing you could potential gain some back....like I said the slightest of gains with just installing plugs. You would have probably noticed the same results with the stock heat range plug esp. since the car is tuned for the stock range plugs. Colder plugs will foul faster and you'll get worse MPG (probably an un noticeable amount)....on the bright side you'll be less likely to have pre ignition and detonation....
I was also thinking it was new plugs not one-step colder that made the difference. I don't even think protuners recommend colder plugs for stage 2.

30k is about as long as plugs last if you drive hard on stage 2.
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Old 01-25-2008, 05:16 PM   #4
CynicX
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^^^

Agile Auto actually recommended me to go with colder plugs when I was protuned at stage 2......but I didnt until I upgraded the turbo....
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Old 01-25-2008, 05:22 PM   #5
Rudywrx04
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According to Unibombers Manifesto. You suppose to do it at about 100 HP over stock. I did change my plugs once at 35k, but put the same heat range. I probably wont get re - pro tunned just for this though. I hope I do not have problems we shall see.
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Old 01-25-2008, 05:29 PM   #6
AllAWD
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Originally Posted by CynicX View Post
^^^

Agile Auto actually recommended me to go with colder plugs when I was protuned at stage 2......but I didnt until I upgraded the turbo....
Really? I thought I even asked Hill and he said not to maybe he just said don't bother.
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Old 01-25-2008, 05:39 PM   #7
02WHITEDUB
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Quote:
Originally Posted by CynicX View Post
^^^

Agile Auto actually recommended me to go with colder plugs when I was protuned at stage 2......but I didnt until I upgraded the turbo....
PDX did the same with me. My stage 2 was + PnP headers + TB and a turbo inlet.
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Old 06-29-2010, 06:56 PM   #8
SleepyWeasel
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Cool! This pretty much answered my question. I don't know why I had it stuck in my head that a step colder was a good idea for just stage II. About to go stage II, and my plugs are (I think) asking to be changed. Now I can go ahead and by stockers!
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Old 01-25-2008, 05:20 PM   #9
quadtard
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Yeah, I don't think stage 2 puts out enough power to think about running colder plugs. I would think you would just wind up fouling them sooner. Its almost time for me to change my plugs, and I'll be going to one step colder, but I'm running an 18g.
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Old 01-25-2008, 05:35 PM   #10
tux121
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Of course Spark Plugs add like 10whp!!
I will just being using the OEM Spark Plugs.
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Old 06-29-2010, 10:27 PM   #11
scoobystas
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is that 100hp crank or whp? Even if its crank, it almost seems like unless you upgrade the turbo, 1 step colder are not necessary, because 100 crank horsepower over stock is tough to achieve on a wrx with stock td04 or for an sti with stock vf39, vf48.
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