burnt out a splitfire direct ignition coil need help!

[exquisit]

im not sure if its the exact same plug used in an s15 but yes... the plug does sit nice inside the coil


again tho, if it wasnt the right plug/incorrect fit, would it blow only one or all four?

thanks mate

[thechuckster]

reads like a pretty small dwell time - but my experience is limited to folks playing with msefi hardware. I would have expected something around 3m/s.

built-in igniters would require a good 12V supply and a good earth. if either of these is suspect then the built-in igniters will misbehave or eventually fail.

there's no ballast resister required for an ignition system that voltage compensates for low-voltage during cranking.

a thought: are the coil-pack connectors plysically well-connected to the top of the plug? if it's having to arc over a small gap it might be giving grief to the coilpack/igniter.

2nd thought: are the igniters dumb or smart? by that i mean, some igniters manage dwell time themselves, others are not much more than a robust silicon switch so require the ECU to manage turning it on at the right time (dwell) before the spark event (when it turns it off).

[exquisit]

yea... the coils seem to connect really well at the top of the plug

there is a good 12v power supply and even if there wasnt wouldnt the earth be more important?
as in a good earth is more important so that it doesnt burn out?

the dwell time for the coils are controlled by the ecu... does that answer your question of dumb and smart?
if not let me know what info you need

thanks for the help

[thechuckster]

if the 12V is pretty poor, you pull more current - if the ECU is monitoring system voltage it can compensate for variations in voltage by extending or shortening dwell time as voltage is respectively above or below 12V

if the earth is poor the igniter doesn't work well

your ecu is treating the ignitors if they were 'dumb' but maybe the actual igniter/coils packs are 'smart'. It would require searching the splitfire specs for their capabilities.

Do you get any interference from the ignition system thru the radio/CD player?

[Moppitt]

I once burnt out an ecu and coil pack because of a bad earth for the coils. Although that was virtually an open circuit, the earth was that bad (new long motor, and painted, earth out of site, had to be put on by feel only) that took about 2 mins of the engine running to do all that damage.

Im not sure which came first though, the ecu dying or the coil, but that was all down to one bad earth.

Yeah, that was a bad day...

[exquisit]

yea sorry to hear bout tat mate
=(

the thing is... the coil didnt die as soon as the engine was started
the engine was run in on the dyno, then dyno tuned... so it was a fair few hours of usage... and also hard usage before it blew

the search continues
=(