Hi guys what’s the recommendation for ignition coil packs. NGK and Swan brand reasonably priced. I hear Spitfire brand is good also but a lot dearer. Thanks for any info.
OEM or modern smart coils that eliminate the PTU. When spitfire coils first became available for VG30, people who tried them said they weren’t as good as stock. They may have improved in the last decade or so.
I had Splitfire coils for a short time. They seemed to be alright but I switched them out for Smart Coils ....... never looked back. The Smart Coils produce more spark than you will ever need and they eliminate the ptu. Getting rid of the oem injectors and ignition coils was one of the best things I ever did to the zeds ! I have a spare set of Smart Coils that I got for the project zed that I never finished. I can do you a good deal on them if you are interested. They are a straight swap. A 20 minute job from start to drive away
I'm just going to put this out there, if wish to stick with OEM style. Another option is the AliExpress yellow coil packs. The suppliers state that they produce a stronger spark than OEM, so I tried them on the Z for a while, until the car went in for a tune. While tuning the engine, it developed a misfire. Was thinking bloody Chinese coil packs, changed over to OEM and still no fix. Checked again only to discover a brocken spark plug. Then just stuck with the OEM and kept the Chinese ones as spares. The OEM units still work just fine and still usable, no point replacing them.
If you google and look for stories from engine tuners, the consensus seems to be that if your tune is good and your using the right fuel for the application, have the right plug type/range (ie. mixing the correct amount of fuel with air in the cylinder) it does matter how much energy is in the spark. You just need enough to put fire in the hole and the mix should do the rest. Obviously correct ignition timing is also crucial. Most OEM ignition coils will do the job if the tune is good. The problem is that when you use different fuels or modify the engine, the demands on the spark quality and duration increases. More energy and longer duration can help overcome poor mixture / bad tune. As a rule of thumb, as cylinder pressure increases above 1 bar there is a need to reduce plug gaps down towards 25 thou. Unfortunately this can have a knock affect by reducing the quality of idle, so lengthening spark duration (dwell time) can partially overcome this. These are things that need to be tested on the dyno as sometimes there can be exceptions to the rules and the findings from others.
