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1NZ Coilpack Upgrade for 1JZ Matthew Salkeld This guide is intended to demonstrate how I replaced my standard 1JZ coilpacks with 1NZ coilpacks in order to allow for cheap future replacement as well as upgrading ignition energy and removing bulky electronics. Update: Got a prototype igniter replacer ready, just need a volunteer to test it and it'll be all good! Basically, standard 1JZ-GTE and 2JZ-GTE coilpacks suck. They really do. They deliver great spark, as many big power cars have demonstrated, but they're just too fragile. Cracks and fissures develop over time all over the coilpack body and this dramatically reduces their spark energy (much of it ends up shorting to the head). Often these cracks are not visible to the eye but that doesn't mean they won't conduct perfectly well (into the head, not the spark plug). I went in search of aftermarket options but quickly discovered the only easy drop-in solutions were extremely expensive or reputedly suffered from the same problems as the original coilpacks (I'm seeing red). Eventually, my search took me to the later model Toyota coilpacks. http://www.ae86drivingclub.com.au/forums/showthread.php/7098-Toyota-Coilpack-info-thread Thanks to Anthony of ae86drivingclub for compiling some info Basically, these coilpacks are all the same. The only apparent difference is the angle of the connector with respect to the mounting hole and the length of the coil itself. My best guess is that all of these coilpacks deliver the same ignition energy (reputation is for well over 100hp/cylinder) and only differ in size. They even have similar part numbers (90919-022XX). They can be found at virtually any wrecker in any country for a very reasonable price. Plugs can be purchased new from toyota or cut from looms at the wreckers. If you want new pigtails, that can be done too. What you'll need: - STANDALONE/AFTERMARKET ECU 6 x 1NZ coilpack ('05 Yaris/Echo 1.5L engine - there are MANY other coilpacks that will also work; differences are height and connector angle only). - optionally: a bracket to hold them all in place. - tools to make a loom and shave a few mm of plastic off cyl 4/5 coilpacks. My design goals for these brackets were as follows: - Cheap to make - Coilpacks must be accessible (unpluggable and removable) without removing entire bracket - Constrain movement fully Amusingly, I was in such a rush to put it all together I forgot to take any photos of it. It's a CNC machine piece and here's a render of it. To make the plugs accessible I needed to have them angled away from each other very slightly. Also keep the standard Toyota coilpack bolts because they're a direct fit for my bracket. Although it's a 3d model (3mm thick aluminium) there wasn't much point showing it off at an angle because that just makes it look all wonky. Anyway, I'll be selling these, if anyone wants to save themselves the hassle of having them made up. They'll be quite cheap. After you've got your coilpacks and a plate to hold them in place you'll need to make a loom. Took me half an afternoon to make this. Coilpacks need an 8A ground, 8A fused, ignition switched 12V power source and a 5v square wave ground trigger. the 5v square wave is pretty standard and I guess most ECU's will output this natively (I used a Megasquirt 3 w/ MS3X for full sequential). Bear in mind that each set of odd/even cylinders will draw power in alternation AND at a low duty cycle (around 20% @ 9000 rpm) so you can use a lesser gauge wire if you want to. I went way overboard and used up all my scraps of 10A wire so my loom is chunky as, in future I'd use 5A or 7A wire). Final fitment after a very spirited drive. All my misfire at high boost is GONE. The car drives far better than it ever has before. Drives more smoothly, idles better and my air-fuel ratios are much steadier. Acceleration is much more crisp and boost feels much better. Bad coilpacks are really hard to diagnose because the car still runs reasonably well. Now it runs better. Also, the standard coilpack cover can be fitted over top as long as your loom isn't too chunky (I can't get the cyl 6 bolts in with my loom but it still looks great with the cover on or off), if you're wanting a stealthier look. Also, after a VERY spirited drive I've tested the temperature of the coilpacks and they're within 3 degrees of ambient! Go touch some standard 1JZ coilpacks after a tough drive and tell me if they feel ambient to you. I suspect that my bracket is shielding the heat away from the coilpacks. PM me if you need a bracket or loom made ($POA). Cheers, Matt Update: And here's my igniter replacer prototype in all it's wondrous beauty.