ozzy Posted September 14, 2022 Report Share Posted September 14, 2022 Hi folks I seem to be having a weird problem with LS2 Coil dwell times. WRX v4 G4+ Plugnplay Closed deck ej257 with g30-900 with ls2 coil conversion with below values. I was pushing 32 psi with g30-770 with no problems. Injectors id1700x at 50psi with aem 400lph x2 inline pumps with surge tank aeromativ fpr After upgrading to g30-900 car started misfiring above 21psi. I first thought it was related to ignition and changed everything new coils spark plugs(gapped to 0,24-0,22 and 0,20) and wires and literally changed everything related to fueling(fpr and fuel pumps and the filter) and checked the injectors and checked for electrical issues and added another super grounding kit just for the peace of mind to no avail. (also checked for boost-vacuum leaks) Someone suggested to increase the dwell times and i can increase the boost to 28psi without misfiring with below values. However above 28 psi its still misfiring. I am scared to increase the dwell times further as i read standart dwell time for ls2 coils is 3,5ms@14V(it says it used to be 4,5ms) It doesnt makes sense to me upgrading the turbo from 770 to 900 would cause this. Can you help me out Thanks Quote Link to comment Share on other sites More sharing options...
remski2 Posted September 14, 2022 Report Share Posted September 14, 2022 What do the spark plugs say ? Quote Link to comment Share on other sites More sharing options...
ozzy Posted September 14, 2022 Author Report Share Posted September 14, 2022 Not much. I have tried iridium spark plugs(was using bkr8eix(s20 heads with matched chambers) with old setup with no problems). This is ngk race series(cant remember the exact model rn) Tried 5 different spark plugs all same Forgot to add compression test all same so not a mechanical issue Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 14, 2022 Report Share Posted September 14, 2022 Can you give us a log. You could add another 0.5ms dwell at 13 & 14V, I dont like going much above 4.5ms with these coils, they will self discharge somewhere above 5ms depending on temp etc. Quote Link to comment Share on other sites More sharing options...
ozzy Posted September 14, 2022 Author Report Share Posted September 14, 2022 Thanks so much Adam. Calibrated dwell time vs map 4.4 solved misfire issues Quote Link to comment Share on other sites More sharing options...
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