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Question about Coil packs and Dizzys 

 

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 Post subject: Question about Coil packs and Dizzys
Posted: Fri Jul 01, 2005 11:44 am 
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Coil packs and Dizzy's....

Am I correct in assuming that an engine fitted with a coilpack, as opposed to a dizzy, (eg compare EF to EL) will have more control over spark advance, and thus be able to take more advantage of higher octane fuel?


Any other differences between them would be good to know. Just out of curiosity!
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Posted: Fri Jul 01, 2005 11:50 am 
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Worth a read:

http://www.fordmods.com/phpBB2/viewtopic.php?t=11422

I think by referring to higher octane fuel, you are talking about total advance... there's nothing stopping a TFI (well, there is kinda...) system matching the total advance of a coil pack... but expect the coil pack to have better control of the spark advance and provide better spark... but yeah - for example, both can provide 40deg BTDC if required...

 

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Posted: Fri Jul 01, 2005 11:52 am 
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4.9 EF Futura wrote:
Worth a read:

http://www.fordmods.com/phpBB2/viewtopic.php?t=11422

I think by referring to higher octane fuel, you are talking about total advance... there's nothing stopping a TFI (well, there is kinda...) system matching the total advance of a coil pack... but expect the coil pack to have better control of the spark advance and provide better spark... but yeah - for example, both can provide 40deg BTDC if required...


I guess what I really meant is does the engine computer have control... rather than slightly twisting the top of the dizzy, old skool 70's style ;-)
Forgive the ignorance!
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Posted: Fri Jul 01, 2005 1:16 pm 
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96ghia wrote:
4.9 EF Futura wrote:
Worth a read:

http://www.fordmods.com/phpBB2/viewtopic.php?t=11422

I think by referring to higher octane fuel, you are talking about total advance... there's nothing stopping a TFI (well, there is kinda...) system matching the total advance of a coil pack... but expect the coil pack to have better control of the spark advance and provide better spark... but yeah - for example, both can provide 40deg BTDC if required...


I guess what I really meant is does the engine computer have control... rather than slightly twisting the top of the dizzy, old skool 70's style ;-)
Forgive the ignorance!


No, the TFI module bolted to the side of your dizzy receives a SPOUT signal from the ECU, which allows for timing to be advanced or retarded (from the 10* BTDC base timing position). I'm not sure by how much exactly, but I'd guess around 20* of variation either way.

The issue with a single coil firing 6 plugs per 720* is the limited amount of dwell available, as the coil needs time to recharge for the next spark event, whereas the coilpacks, comprising of 3 seperate coils can dwell for longer as each coil only has to be ready twice per 720*. Currently the dwell set for my coilpack (EDIS) setup is 4.8ms, whereas if it were a single coil/dizzy (TFI) setup i'd be limited to 2-3ms.

 

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