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Spark Plugs

This is a discussion on Spark Plugs within the Kia Forte Turbo Maintenance forums, part of the Kia Forte Turbo Garage category; 1 step colder is the xp5702 plugs. The xp5701 are 2 steps colder than stock. I also gapped mine to .028 and it's running perfect...

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  1. #11
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    1 step colder is the xp5702 plugs. The xp5701 are 2 steps colder than stock.

    I also gapped mine to .028 and it's running perfect
    15 F5 A/T , 6th intake, Rev Motorsports 75A & 65A dogbone bushings, Second cat delete, Custom FMIC, 2.5" exhaust with Pypes muffler, TurboSmart Vee Port Pro , 2 ADD W1 catch cans, Transmission Cooler, DEI Wrapped intake, Custom 3"-2.5" lower intake pipe, Oil Cooler (needs to be installed), TB coolant bypass, Tork Motorsports tuned, Prosport boost gauge, NST lightweight pulleys, 60mm TB, Storm lowering springs, 3" single exit axle back.
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    Senior Member Playwithmymind's Avatar
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    HAHAHAHAHAHAHA, it cost less for all 4 then I spent for one HKS. Still have to install the plugs but hey for $25.52 for all 4 I will give it a shot (they have a 7 year warranty on them against going bad) since I am on my 3rd set with only 20K miles.
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    Quote Originally Posted by Playwithmymind View Post
    HAHAHAHAHAHAHA, it cost less for all 4 then I spent for one HKS. Still have to install the plugs but hey for $25.52 for all 4 I will give it a shot (they have a 7 year warranty on them against going bad) since I am on my 3rd set with only 20K miles.
    Exactly! I got mine for $27 and they are cheaper than the ngk 1422 plugs I had!
    15 F5 A/T , 6th intake, Rev Motorsports 75A & 65A dogbone bushings, Second cat delete, Custom FMIC, 2.5" exhaust with Pypes muffler, TurboSmart Vee Port Pro , 2 ADD W1 catch cans, Transmission Cooler, DEI Wrapped intake, Custom 3"-2.5" lower intake pipe, Oil Cooler (needs to be installed), TB coolant bypass, Tork Motorsports tuned, Prosport boost gauge, NST lightweight pulleys, 60mm TB, Storm lowering springs, 3" single exit axle back.
    Instagram: Forte5t
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    Replaced my plugs, not sure if placebo effect, or if they are actually better, but car does seem to run better. I had 10K on factory plugs, and I gotta say, they where a little dirty for only having 10K on them. Oh well, I'll put some miles on the car and let you know if it still seems to be better.
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    Quote Originally Posted by SXT View Post
    Replaced my plugs, not sure if placebo effect, or if they are actually better, but car does seem to run better. I had 10K on factory plugs, and I gotta say, they where a little dirty for only having 10K on them. Oh well, I'll put some miles on the car and let you know if it still seems to be better.
    What plugs did you use?

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    Quote Originally Posted by 2014RacingRedTurboKoup View Post
    What plugs did you use?
    Post #11 maybe you missed it
    2014 Forte Koup
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    Quote Originally Posted by 2014RacingRedTurboKoup View Post
    What plugs did you use?
    Depends on if he is stock or not. For stock replacement the xp5703 or even the xp5702 would work good. For tuned the xp5701
    15 F5 A/T , 6th intake, Rev Motorsports 75A & 65A dogbone bushings, Second cat delete, Custom FMIC, 2.5" exhaust with Pypes muffler, TurboSmart Vee Port Pro , 2 ADD W1 catch cans, Transmission Cooler, DEI Wrapped intake, Custom 3"-2.5" lower intake pipe, Oil Cooler (needs to be installed), TB coolant bypass, Tork Motorsports tuned, Prosport boost gauge, NST lightweight pulleys, 60mm TB, Storm lowering springs, 3" single exit axle back.
    Instagram: Forte5t
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    Quote Originally Posted by 2014RacingRedTurboKoup View Post
    What plugs did you use?

    Autolite XP5703
    Forte5 likes this.

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    Okay... So for the un-initiated such as myself to turbos, what does "going a step colder" mean?

    Why can't you run XP5701's on a stock motor?

    Does running "colder plugs" improve performance?

    And finally... I am making a list of "essential mods" that I want to do lol, so from what I have read in this thread, the stock plugs are junk, yes?

    Thanks so much
    Ochee08 likes this.

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    Senior Member schizorazgriz's Avatar
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    I read something on the NGK website

    "A good rule of thumb is, one Heat Range colder for every 75–100hp added."

    Soooooo unless I get a tune and full bolt on I can run stock plugs right? Won't colder plugs build up junk on them? Please enlighten.
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