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Played Around With Pfc And Splitfire Coil Dwell And Stuff...

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Beer Baron Grand Master

Beer Baron

Posted
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very keen to see what you think of the FET ones. they are black right? with a little red bit on the top? i've seen a few saurus cars in japan using them.

STATUS Grand Master

STATUS

Posted
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very keen to see what you think of the FET ones. they are black right? with a little red bit on the top? i've seen a few saurus cars in japan using them.

all red, but mine are quite old the newer ones may be differrent. I will check.

Blitz Grand Master

Blitz

Posted
Posted
very keen to see what you think of the FET ones. they are black right? with a little red bit on the top? i've seen a few saurus cars in japan using them.

They are all red

There is another company making similar coils called Okaka Projects, not sure what colour they use.

Beer Baron Grand Master

Beer Baron

Posted
Posted
all red, but mine are quite old the newer ones may be differrent. I will check.

hmm, that could be them. i am running the splitfires now (and they have been fine to this point), but I can't help but feel there is a better option. I notice some very hardcore cars built by saurus running what I think are the FET ones, and I noticed when I was at veilside their R32 GTR drag car was running standard coils... I was so shocked I even asked Hiranao to make sure. as at the time it went against my belief that standard = crap. I now seem to lean towards: worn out standard = crap, but brand new nissan coils = the best (but cost is way too much).

STATUS Grand Master

STATUS

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Posted (edited)

http://cgi.ebay.com.au/FET-DIRECT-IGNITION...8QQcmdZViewItem

found these for sale on ebay ^^^^ they are the same as the ones i have.

post-34927-1178178154.jpg

Edited by URAS
rob82 Mentor

rob82

Posted
Posted

I always worried about editing this feature in the PFC because I believe Datalogit have their description incorrect. How can coil dwell be dependant upon rpm? Secondary coil voltage is dependant upon input power so with a fixed impeadance only voltage and dwell will affect the final spark engergy. Most of the jap stuff I have seen - including tuning of factory ECU's, coil dwell is allways based upon amount dwell vs battery voltage not rpm unless of course its duty clyle based - but then the numbers dont make sense.

Has anybody had time to scope the dwell after editing this table? And yes there is a point that more dwell will result in less secondary coil voltage.

Adriano Grand Master

Adriano

Posted
Posted

Maybe the thinking behind this is that if you give the coil enought dwell to produce maximum spark energy all the time, then they will overheat, so i guess you could give it a bit more dwell around peak BMEP/torque, to give it the added spark energy without the fear of cooking the coils, as they aren't getting that dwell much of the time? I remember reading that splitfires like a bit more dwell than standard, so i believe it is possible that they may have a different gauge wiring, combined with a different winding ratio between the primary and secondary circuits, food for thought..., please feel free to diagree

rob82 Mentor

rob82

Posted
Posted

I hear what your saying but spark energy is "usually" a function of dwell vs batery voltage not dwell vs rpm - as it is within the datalogit software. Dont get me wrong this table may affect dwell but it may just be worded incorrectly and the scaling from hexidecimal to actual engineering numbers may be wrong. Its one of those things I would test if I only had a free second at work!!!

Craved Grand Master

Craved

Posted
Posted

why are these settings sweet?

what are the benefits of these settings?

Are these going to be best for all cars? if not which ones?

as there isnt much point for posting it if there isnt anything for everyone on the forums besides tuners

Adriano Grand Master

Adriano

Posted
Posted (edited)

Ther was a thread on here a while ago about increasing the dwell on PFC to 1.7ms to suit the splitfires, is it only from the datalogit, or can it be done from the h/c(its been ages since i used one.)I would have thought dwell vs batt voltage would be a no brainer, batt voltage down a little, give it a bit more dwell. If this works as rob says and isnt just a bad translation, i dont see why everyone couldnt tailor their dwell to suit their application, could even set the PFC up to run external bosch coils if the range is big enough(how high can it go?)

Edited by Adriano
STATUS Grand Master

STATUS

Posted
  • Author
Posted
I hear what your saying but spark energy is "usually" a function of dwell vs batery voltage not dwell vs rpm - as it is within the datalogit software. Dont get me wrong this table may affect dwell but it may just be worded incorrectly and the scaling from hexidecimal to actual engineering numbers may be wrong. Its one of those things I would test if I only had a free second at work!!!

There is almost always two settings;

IGNITION VOLTAGE DWELL COMPENSATION (amount of time added to base ignition dwell as a function of ignition voltage)

IGNITION DWELL PERIOD ((length of time the ignition coil dwells as a function of rpm) sometimes this is a percentage of duty, like remaps for example)

rob82 Mentor

rob82

Posted
Posted

My thinking is that there is a scaler of "base dwell time" that is not accessable via datalogit or the hand controller. Then there is a mutiplier "IGN vs BatV" which should read "Ignition Dwell mutiplier vs BatV". Then the "IGN dwell vs RPM" is another mutilpier based on RPM.

Also it cant be duty cycle based as all nissan's use dumb ignitors.

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