_GTR_ Posted March 9, 2014 Share Posted March 9, 2014 How to Install Do-Luck Ignition Harness for R33 GTR. Tools Needed: 4mm Allen Key for Valley Cover Pliers for Blow By Hose's 8mm Socket 10mm Socket 12mm Socket 14mm Socket for Strut Tower Bar Ratchet with short extension Step 1: Once Strut Tower bar is removed, Use a 4mm Allen Key to remove the 8 bolts from the Valley Cover. Then use pliers to move the clip down the hose of the blow by hose. Step 2: Then use a 8mm socket to remove the transistor earth cable, Once that is Done remove the Connector off the transistor unit. Step 3: Remove Valley Cover and Unplug Coil Harness Transistor Connector. Next Remove the 6 Coil Pack Connector. Step 4: Use a 10mm socket with short extension to remove the Coil Pack Harness Earth Cable Step 5: Remove the Intake Side Blow-By Hose and then Unplug Connector. Now you can remove the whole Coil Pack Harness. Old OEM Harness Removed Step 6: Installing the Do-Luck Harness, There are 3 parts to this: The Harness, Earth Cable and Direct Power Feed with Extension Cable. First sit the Do-Luck Harness in place and connect the harness earth cable and the Thick Blue Earth Cable to the same coil harness earth point. ( Behind Coil Pack Number 6 ). Next there is a Connector on the end of the Do-Luck Harness this connects near the intake side blow-by hose. Once that is done connect all the coil pack connector’s on. Step 7: Connect the Thick Blue Earth Cable anywhere in the engine bay. I connected mine near the ABS system. Step 8: Connecting the Direct Power Feed with Extension Cable. First Connect the Extension Cable to the end Coil Pack Harness once that is done connect the other end to the direct power feed unit. Step 9 Connect the Direct Battery Feed Unit to the relay box as shown in the photo below and then connect the Direct Battery Feed Unit Earth to either one of theses Earth points shown in the photo below. Now it all Connected Up double check that everything is connected and then reconnect all the transistor plugs and transistor earth point. Then reinstall Valley Cover and Tower Strut Bar. Step 10: Everything is DONE!! Start it up and take it for a spin. Results: When I started the car up the exhaust tone changed and then I gave it a few revs 3000- 4000 rpm and it wasn’t backfire anymore. Next I took it for a 15min drive up to 7000 rpm and it wasn’t backfiring under boost as it did sometimes. More testing is required to see if it has removed the under 3000 rpm Miss problem and Backfiring under boost problem. I will keep everyone posted on further result’s but so far I’m happy with the Result. 1 Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/ Share on other sites More sharing options...
SiR_RB Posted March 10, 2014 Share Posted March 10, 2014 Great right up How much was the harness delivered? Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/#findComment-7223547 Share on other sites More sharing options...
_GTR_ Posted March 10, 2014 Author Share Posted March 10, 2014 $215.46 AUD from RHD Japan. Unsure on the postage cost as I bought multiple items from them at once. http://www.rhdjapan.com/do-luck-enhanced-ignition-harness-kit-nissan-skyline-gt-r.html Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/#findComment-7223696 Share on other sites More sharing options...
Sinista32 Posted March 10, 2014 Share Posted March 10, 2014 (edited) What's the performance difference between Do-luck and OEM ? I see it says enhanced in the link - what does that mean - how ? Never mind, Googled Apparently uses thicker wire for better strength of signal/power (1.6x's thicker) Coupled with the "direct wire" from battery (extra) improves voltage delivery. Edited March 10, 2014 by Sinista32 Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/#findComment-7223703 Share on other sites More sharing options...
_GTR_ Posted March 11, 2014 Author Share Posted March 11, 2014 Took the car out for more testing 70km trip and the backfire problem under boost is gone. The Under 3000rpm miss is still there but not as often. My Setup: Copper Core Spark Plugs 0.8 gap Splitfire Coil Packs Do-Luck Coil Harness 1 Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/#findComment-7224212 Share on other sites More sharing options...
ms33 Posted May 28, 2017 Share Posted May 28, 2017 Just about to fit mine, what an excellent write up. Link to comment https://www.sau.com.au/forums/topic/440274-do-luck-ignition-harness-install/#findComment-7831796 Share on other sites More sharing options...
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