How is coil dwell calculated? Is there a table for this?

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NOTORIOUS VR

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	How is coil dwell calculated? Is there a table for this? « on: March 13, 2012, 04:03:54 PM »

Wondering if we have control over the ignition dwell times for the coils... would be nice to see if we can slightly increase spark output this way.

Unless of course this is hard coded?


« Last Edit: March 13, 2012, 04:07:04 PM by NOTORIOUS VR »	Logged

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s5fourdoor

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #1 on: March 13, 2012, 04:22:23 PM »

i can't answer this, but i did just complete the 2.0t ignition coil conversion. the car has never, not matter what I've done to it or how it's been tuned, been this smooth. i highly highly recommend doing the conversion or buying the 034 kit... i can't wait to check my gas mileage after 1000 miles.


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NOTORIOUS VR

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #2 on: March 13, 2012, 04:42:57 PM »

I have the adapter plates and D style plugs.. just need to sit down and remove my engine harness so I can open it up and do the new plugs


« Last Edit: March 13, 2012, 04:50:02 PM by NOTORIOUS VR »	Logged

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phila_dot

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #3 on: March 13, 2012, 05:34:53 PM »

I can't give you the tables off of the top of my head, but I think you wanna look at AZUE in the FR.


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berTTos

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #4 on: March 13, 2012, 05:48:11 PM »

Quote from: nehalem on March 13, 2012, 04:22:23 PM

this is good to know. i'm on my original coils and pos modules and don't have any issues - but they have to have deviated from optimum after all these years and miles. i've been planning on a full refresh but if the 034 conversion works well then that seems to be the way to go.


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elRey

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #5 on: March 13, 2012, 07:21:36 PM »

from a me7.5

KFTSRL -> RPMxLoad
TSMX -> max


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NOTORIOUS VR

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #6 on: March 13, 2012, 07:30:41 PM »

^^^Thanks... gonna look into that


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fredrik_a

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #7 on: March 14, 2012, 08:55:30 AM »

Be careful with coil dwell time as too much time will damage the coils badly. Ideally, it is dependant on battery voltage and combustion pressure although not all EMS take the combustion pressure into concideration.


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NOTORIOUS VR

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #8 on: March 14, 2012, 09:02:44 AM »

Yes I am aware of this... but good info regardless!


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silentbob

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #9 on: March 15, 2012, 01:03:26 AM »

ZUESZ contains all the info you need Wink


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NOTORIOUS VR

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #10 on: March 15, 2012, 05:57:58 AM »

^^^ Thanks.... It's nice to see you back BTW!


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phila_dot

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #11 on: March 15, 2012, 07:12:02 AM »

Quote from: silentbob on March 15, 2012, 01:03:26 AM

ZUESZ contains all the info you need Wink

I was going to post this yesterday, but I haven't completely gone through it. Specifically zuesz-band (interval ignition/spark band ignition). The function is clear in ZUESZ but I haven't gone through the implementation in AZUE.

The coil dwell time szout_w is calculated out of KFSZT (voltage dependant closing time) and factored by FSZTM (engine temp dependant factor).

KFSZT (nmot, ub)
FSZTM (tmot)


« Last Edit: March 15, 2012, 07:20:13 AM by phila_dot »	Logged

elRey

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #12 on: March 15, 2012, 05:12:10 PM »

As I understand it KFSZT or FSZTM are only utilized at low engine speeds/ide and the rl/nmot maps are utilized when it counts.


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phila_dot

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #13 on: March 15, 2012, 08:44:57 PM »

Quote from: elRey on March 15, 2012, 05:12:10 PM

As I understand it KFSZT or FSZTM are only utilized at low engine speeds/ide and the rl/nmot maps are utilized when it counts.

Quote from: elRey on March 13, 2012, 07:21:36 PM

from a me7.5

KFTSRL -> RPMxLoad
TSMX -> max

Took a brief glance at the FR, the output from the maps you listed, szrl_w, doesn't get applied anywhere.

The output to hardware occurs in AZUE based on szout_w from the maps I listed.

Do you have any more info on this?

Also, does anyone know the purpose of subfunction zuesz-band?
It's output to AZUE as well, but it's inactive due to CW-FUBND=0.


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elRey

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	Re: How is coil dwell calculated? Is there a table for this? « Reply #14 on: March 16, 2012, 01:01:03 AM »

carefully reading func desc for azue/zuez and realizing there are 2 'igntion regions/ranges' dictated by b_zl. then noticing zuez has an output of szcal which is the only output switched by b_zl. im making the assumption the notes are incomplete. and szout from zuez is prematurely labeled or szout is only part of what is used to set dwell and it factors in szcal as well. ie. szout = dwell time but szout *+or/ szcal = dwell angle which is more applicable when using crankposition as a gauge when to start/stop dwell.


« Last Edit: March 16, 2012, 07:47:06 AM by elRey »	Logged

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