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Title: How is coil dwell calculated? Is there a table for this? Post by: NOTORIOUS VR 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? Title: Re: How is coil dwell calculated? Is there a table for this? Post by: s5fourdoor 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.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: NOTORIOUS VR 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
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot 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.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: berTTos on March 13, 2012, 05:48:11 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. 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. Title: Re: How is coil dwell calculated? Is there a table for this? Post by: elRey on March 13, 2012, 07:21:36 PM from a me7.5
KFTSRL -> RPMxLoad TSMX -> max Title: Re: How is coil dwell calculated? Is there a table for this? Post by: NOTORIOUS VR on March 13, 2012, 07:30:41 PM ^^^Thanks... gonna look into that
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: fredrik_a 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.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: NOTORIOUS VR on March 14, 2012, 09:02:44 AM Yes I am aware of this... but good info regardless!
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: silentbob on March 15, 2012, 01:03:26 AM ZUESZ contains all the info you need ;)
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: NOTORIOUS VR on March 15, 2012, 05:57:58 AM ^^^ Thanks.... It's nice to see you back BTW!
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 15, 2012, 07:12:02 AM ZUESZ contains all the info you need ;) 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) Title: Re: How is coil dwell calculated? Is there a table for this? Post by: 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.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 15, 2012, 08:44:57 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. 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. Title: Re: How is coil dwell calculated? Is there a table for this? Post by: elRey 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.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: ta79pr on March 16, 2012, 03:27:51 AM Could it be that the system has the ability, but it is simply not applied anywhere we see because it is only utilized in direct injection systems?
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: jibberjive on March 16, 2012, 07:12:39 AM I like the direction this is going. BTW, I might be waterjet cutting my own coil adapter plates, and might consider doing a bunch of them at the same time to hook some fellow NefMoto'ers up, if you guys would be interested.
Title: Re: How is coil dwell calculated? Is there a table for this? Post by: elRey on March 16, 2012, 10:26:57 AM 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. multi-spark ignition (multiple sparks per one cylinder ignition) Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 16, 2012, 11:17:08 AM multi-spark ignition (multiple sparks per one cylinder ignition) Yea, another quick glance this morning revealed "ME7 is configured for single spark and dual spark output". Title: Re: How is coil dwell calculated? Is there a table for this? Post by: masterj on March 16, 2012, 01:06:05 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. Any tutorials how to do the 2.0t conversation? ;) Title: Re: How is coil dwell calculated? Is there a table for this? Post by: elRey on March 16, 2012, 01:17:32 PM Yea, another quick glance this morning revealed "ME7 is configured for single spark and dual spark output". Have you bothered to look closer at AZUE function notes? The more I look at it the more I hold to my previous statement. Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 16, 2012, 02:07:25 PM Have you bothered to look closer at AZUE function notes? The more I look at it the more I hold to my previous statement. Yea, I just got to the part that resembled what you were saying, but I had to run. I'm gonna have another look later. Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 16, 2012, 03:03:37 PM It looks like the maps I listed are for igniton range 1 (low engine speed). There is a hard switch to ignition range 2 when engine speed crosses the threshold SY_NZUEB.
It looks like the code is there for dual spark ignition. What pros and cons are there for this and what hardware changes would be required? Title: Re: How is coil dwell calculated? Is there a table for this? Post by: phila_dot on March 16, 2012, 10:46:59 PM It looks like the code is there for dual spark ignition. What pros and cons are there for this and what hardware changes would be required? It looks like this can be implemented without any hardware changes and could really benefit E85 cold starts at least. |