260DET Posted April 10, 2008 Share Posted April 10, 2008 Am using a set of GM LS coils with built in ignitors on the VG30DET, driven directly by a MoTec M600. Problem is they are breaking down ~6000 rpm with stock spark plug gaps. A friend suggests that the problem may be caused by an incorrect constant charge time, he suggests 5ms. To check this out the car has to go back on the dyno so any informed opinions would be helpful. The coils look different to those used on Corvettes, they are used on family type vehicles so may be a lower capacity? If the present coils are unsuitable for 450whp @ 7500rpm then please advise. Quote Link to comment Share on other sites More sharing options...
dapiper Posted June 4, 2008 Share Posted June 4, 2008 I use 4ms on my LS1 coils on 6 cyl. According to my PicoTech, they saturated at 8ms, but that would be too much current at higher RPM. Quote Link to comment Share on other sites More sharing options...
chickenwafer Posted October 30, 2009 Share Posted October 30, 2009 Are you using the GM LS2 coils with the heat sink potted in the rear of the coil? Is so 5ms is the ticket. Any less and they will not saturate enough. The internal ignitor is capped at 7.7ms, as well. Quote Link to comment Share on other sites More sharing options...
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