In conjunction with the 65mm billet upgrade on our TT, I would also like to change out the plugs while I have the turbos out. Can anyone speak from experience on the best suited route I should consider?

Upgrades: 65mm billet wheels
New bearing and seals
Werksone intercoolers
Werksone air intake
Werksone Boost hoses
AP Straight exhaust
GIAC Tune-Race and Pump
AP BRV
5bar FPR

 

Stock OEM or Denso PK20PR-P8.* Gap to .025
Double check the coils also

 

Denso IK-20 for performance in lieu of PK20 for duration (I definitely recommend the PK20 for those that don't want to deal with changing plugs or paying $600 for the dealer to change plugs). The PKs are double platinum (platinum tip and ground) which I would recommend at a minimum. They are recommended for changing at 60K-100K miles. The IKs are iridium tip and ground providing for a larger flame basket and better ignition (blah blah blah, btw NOT affiliated), these are recommended to change every 30K miles. The gap at .025 is the same, but recommended you reduce the heat resistance for every 100 hp you add to the engine. This is a ball park and not an exact science for most mere mortals on this forum. The heat of the plug refers to how much heat it removes from the combustion chamber through the insulation material. A spark plug’s heat range is its ability to dissipate heat. The “colder” the plug, the more heat it can channel out of the combustion chamber. In a performance application, colder heat ranges may be necessary to handle the extreme temperatures brought on by higher compression ratios, forced induction, and high RPM’s. While “Colder” plugs may seem to be the way to go, please remember that the spark plug must achieve its “self-cleaning” temperature where it can burn off fuel and carbon deposits. Otherwise, the plug could “foul out” where it is prone to misfiring and poor acceleration. A plug that is too “hot” can overheat, also causing power loss, detonation, pre-ignition, and possible engine damage. A good, general rule of thumb is to start with the factory recommended heat range. For every 75 to 100 hp you add to your engine, you may go to the next colder step. DENSO heat ranges move up as they get colder; 16 would be our hottest Iridium Power plug, 34 would be our coldest (ranges; 16,20,22,24,27,31,34)

IK20 is the recommended heat range, but you could go to 22 for an additional 75-100 hp and then 24 for an additional 150-200 over stock and so on.

BTW, I got the IK20 plugs at ADVANCE AUTO PARTS for about $6-8 per plug. They can't pull up the exact part number as IK-20, but it comes up online and they definitely carry these plugs. The IK-22 or IK-24s may have to be special ordered depending on how much extra juice you are squeezing.

Here is the link if you are interested or have any other questions. http://www.densoiridium.com/ir_power.php

Last thing, they also claim an additional 10-20hp on turbo charged engines based off a Mustang 5.0L shootout hosted in some magazine, but I don't know if I would buy into that just yet.

 

Nice post.

 

am running NGKBKR7EIX (2667) , they fine

btw i would like to ask you why you are running 5bar FPR ?? is the stock one not enough ??

thanks