JDC DIY Hitachi GT-R Coil-On-Plug Ignition Systems (Evo 4-9)

The DIY JDC Ignition System allows you to purchase the same high-quality wire harness, mounting plate, mounting hardware, and coils if needed but leaves the assembly up to you!

Which coils should I use? 

• To ensure proper performance and compatibility, we highly recommend purchasing the coils from us as there is a slight modification required to make them work correctly. When you purchase the coils from us, we will make the necessary adjustments for you, saving you time and hassle.
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• We recommend running authentic Hitachi coils for the GT-R, as they are the OEM manufacturer of the coils that come on the GT-R. The most popular part number for the best performance would be Hitachi (IGC0079). These have been used by the top companies in the industry for many years and have proven to be the best-performing and longest-lasting option available. There are also other options with Hitachi-style connectors. Select your options from the drop-down menu and let us know if you have any questions!

Tuning and Usage Notes:

• We suggest installing your cop system with dielectric grease to reduce the chances of corrosion in the springs.
• We suggest setting the factory dwell time at 3.4ms @14v to help keep the coils cool.
• These upgraded coils can support up to 4.5ms which would allow you to run an even larger spark plug gap for better combustion, which could support even more horsepower.
• For example, 3.0ms @14v has easily supported 870whp on a mustang dyno.
• Saturation that could shorten the life of the coils and cause premature failure would be around 5.5ms @14v.
• For high-power builds a .014 - .018 spark plug gap may be sufficient but will vary depending on your individual vehicle.

• NO COILS INCLUDED
  
• Lifetime warranty on wire harness and mounting plate
• Recommended use with Hitachi coils for GT-R ( IGC0079)
• Military spec wire sheath, rated to 428degF
• Military spec tefzel wire, rated to 393degF
• Waterproof seals on all ports of wire harness
• Plug-and-Play Wire Harness (no assembly required) 
• Black Anodized 6061 Aluminum, Carbon Fiber, or Titanium mounting plate
• Stainless steel or Titanium hardware
• Titanium Mounting Plates are only available with Titanium Hardware

What's in the box?

• Mounting plate
• Assembled Wire Harness
• Mounting Hardware
• 15A Fuse
• Installation Instructions & warranty information
• JDC Stickers for the top of each coil