D585 coils dwell time
D585 coils dwell time Anyone had experience in a boosted situation with the d585's. Did some searching and found a couple threads that stated the truck could could possibly fire early if a certain amperage was reached. Please shed some light on this. I've got a suspected weak stock ls coil on my t/a so this is why I'm looking at the truck coils. Thanks Chris
These are smart coils that automatically fire when over saturated. Somewhere in the realm of 4-5 ms is when they automatically fire (depends on the voltage). They automatically fire to prevent getting damaged. The automatic firing will act (usually if not always) as an increase in ignition timing due to the early discharge, and could potentially damage your piston due to knock.
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Some Supra guys have lost motors running in the 5ms range a few years back. Testing was done and found that above the 4.5ish range the coil does self fire, advanced
That said, I've ran 3.7ms on my 2jz car for years now and have been running 3.5ms on my LS car at around 1100whp. Voltage plays a lot, when I was having alternator issues and would run battery voltage during a pass, I would start to lose a coil and that particular cylinder would show cold on the egt log
That said, I've ran 3.7ms on my 2jz car for years now and have been running 3.5ms on my LS car at around 1100whp. Voltage plays a lot, when I was having alternator issues and would run battery voltage during a pass, I would start to lose a coil and that particular cylinder would show cold on the egt log
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Some Supra guys have lost motors running in the 5ms range a few years back. Testing was done and found that above the 4.5ish range the coil does self fire, advanced
That said, I've ran 3.7ms on my 2jz car for years now and have been running 3.5ms on my LS car at around 1100whp. Voltage plays a lot, when I was having alternator issues and would run battery voltage during a pass, I would start to lose a coil and that particular cylinder would show cold on the egt log
That said, I've ran 3.7ms on my 2jz car for years now and have been running 3.5ms on my LS car at around 1100whp. Voltage plays a lot, when I was having alternator issues and would run battery voltage during a pass, I would start to lose a coil and that particular cylinder would show cold on the egt log
Do you know if this is this the same for all LS style coils?
Last edited by svslow; Jan 10, 2017 at 09:28 AM.
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I have D585s on my evo and when i first swapped over with no other changes it started kicking back when cranking like it had way too much timing. I messed with the timing at crank and some other stuff but reducing the dwell is what ultimately stopped the issue.
My understanding is they fire at about 5 ms so you want running dwell about 3.7-4ms
my silverado has the bigger square truck coils which now seem to be regarded as the 'best' ones. The D585s used to be considered the best, and the dwell issues were news to me when i started looking into why my evo was kicking back. I ran them on my old bbc without issues but that was a long time ago and i have no idea what the dwell was, or if it could even be adjusted(FAST Classic)
My understanding is they fire at about 5 ms so you want running dwell about 3.7-4ms
my silverado has the bigger square truck coils which now seem to be regarded as the 'best' ones. The D585s used to be considered the best, and the dwell issues were news to me when i started looking into why my evo was kicking back. I ran them on my old bbc without issues but that was a long time ago and i have no idea what the dwell was, or if it could even be adjusted(FAST Classic)
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Delphi 585 Hi, YES the above post's are correct with our "585" coil and ONLY some of the others.
Delphi engineers REQUESTED that feature, the "stall saver".
Understand the when ANY coil is Truncated, the Amp Draw becomes VERY HIGH melting the coil, driver, wires, etc.
The PROBLEM with that feature is the Spark Instant is ADVANCED when the coil is discharged early.
Lance
Delphi engineers REQUESTED that feature, the "stall saver".
Understand the when ANY coil is Truncated, the Amp Draw becomes VERY HIGH melting the coil, driver, wires, etc.
The PROBLEM with that feature is the Spark Instant is ADVANCED when the coil is discharged early.
Lance