Ignition Dwell - New Definitions

wrxspeed · **Joined:** Thu Dec 28, 2006 6:08 am **Posts:** 11

you hit the nail right on the head....as the rpm goes up theres is less of a chance to fully charge the coils, that is why you will see on stand alone ecu the m.s drops the higher the rpms.

ok how about engine starting tables like
Cranking vs inj pulse
Cranking vs coolant
post start enrichment
post start decay
fuel pump prime..etc

Decel fuel cut would be sick that would explain why some cars will handle any B.O.V and some wont.

also i have a bounty on the knock treshhold for who ever finds it no disrespect for who have tried.

elevenpoint7five · **Posted:** Sun Jan 31, 2010 11:44 pm

wrxspeed wrote:

you hit the nail right on the head....as the rpm goes up theres is less of a chance to fully charge the coils, that is why you will see on stand alone ecu the m.s drops the higher the rpms.

ok how about engine starting tables like
Cranking vs inj pulse
Cranking vs coolant
post start enrichment
post start decay
fuel pump prime..etc

Decel fuel cut would be sick that would explain why some cars will handle any B.O.V and some wont.

also i have a bounty on the knock treshhold for who ever finds it no disrespect for who have tried.

Are you asking for those tables? The knock threshold is not what you are hoping for. I assume you want to decrease the sensitivity of the knock sensor? I'm sorry but that isn't going to happen on the 16bit ecu. Perhaps something like this exists on the 32bit, but it does not exist on the 16bit.

Andy

wrxspeed · **Joined:** Thu Dec 28, 2006 6:08 am **Posts:** 11

elevenpoint7five wrote:

wrxspeed wrote:

you hit the nail right on the head....as the rpm goes up theres is less of a chance to fully charge the coils, that is why you will see on stand alone ecu the m.s drops the higher the rpms.

ok how about engine starting tables like
Cranking vs inj pulse
Cranking vs coolant
post start enrichment
post start decay
fuel pump prime..etc

Decel fuel cut would be sick that would explain why some cars will handle any B.O.V and some wont.

also i have a bounty on the knock treshhold for who ever finds it no disrespect for who have tried.

Are you asking for those tables? The knock threshold is not what you are hoping for. I assume you want to decrease the sensitivity of the knock sensor? I'm sorry but that isn't going to happen on the 16bit ecu. Perhaps something like this exists on the 32bit, but it does not exist on the 16bit.

Andy

yes i was asking if the tables are in there somewhere. the table you posted before looks just like the misfire treshold that Cobb has in there software.

elevenpoint7five · **Posted:** Thu Feb 04, 2010 5:31 am

All of those tables are in the existing defs are they not? Decel fuel cut still needs some work, but I know it exists. And that is the misfire threshold table, but as I have no idea what the threshold means, I never defined it.

Andy

mrf582 · **Posted:** Sat Feb 13, 2010 4:07 am

dschultz wrote:

Maybe you guys have seen this before, I just ran across it. It appears to be a test of the grey and black coil packs.

Attachment:

Subaru_coils.pdf

Just to confirm for me, in the electronic ignition world, is this dwell time table the amount of time the primary coil circuit is de-energized to release the flux into the secondary coil?

If I did my calculation correctly on a 4 cylinder engine a single spark plug is sparking every 'x' msec at these RPM.

Code:

RPM   msec
500   240
1000  120
3600  33.33
8000  15

So at 8000rpms if you run 5ms of dwell time like you 'can' on the grey coils, then you have 10ms of cooldown time. Weren't the early UTECs blowing coils on the early cars? I imagine they had the older black coils though which according to that document can only handle 3ms. Eitherway, the factory thinks ~12.5ms of cooldown time is enough at 8000rpm on grey coils. How far can we push that?

SVT_WRX · **Joined:** Fri Jun 06, 2008 6:35 pm **Posts:** 39

Hmmm....In regards to the .pdf, I'm assuming this means don't run no more than 3ms. I'm wondering if I should just put in a flat 3ms or just slightly less across the board. Thoughts?

Sasha_A80 · **Posted:** Sat Feb 13, 2010 7:31 pm

Slightly more across the board.
The lower RPM the longer.
You need some extra period just in case for engine acceleration.
From the other hand the ignition power circuit has 7-9 amps current limiter in order to protect coils and driver outputs.

legaulois · **Posted:** Thu Aug 12, 2010 3:18 pm

For AZ1G201G, AZ1G202G and AZ1G2000

X Axis D45EC
Y Axis D462C
Table D4640

Subeboost · **Joined:** Tue Apr 24, 2007 6:33 am **Posts:** 182

2008+ WRX/STi uses FK0334 coil packs. They look identical when compared to older FK0186 model.

It would be great to see how the dwell times looks like. Any info?

Subeboost · **Joined:** Tue Apr 24, 2007 6:33 am **Posts:** 182

legaulois wrote:

For AZ1G201G, AZ1G202G and AZ1G2000

X Axis D45EC
Y Axis D462C
Table D4640

Those are not working for me..

dschultz · **Posted:** Fri Nov 19, 2010 5:51 pm

What ROM are you looking at this for?

Subeboost · **Joined:** Tue Apr 24, 2007 6:33 am **Posts:** 182

2008+ WRX/STi rom stock roms found on scoobypedia for example. I am trying to figure out FK0334 coil pack dwell table.

Subeboost · **Joined:** Tue Apr 24, 2007 6:33 am **Posts:** 182

I think that I found out that the newer FK0334 coil pack dwell time is the same as the older FK0186 coil. This is what I came up with..

wrxspeed · **Joined:** Thu Dec 28, 2006 6:08 am **Posts:** 11

elevenpoint7five wrote:

wrxspeed wrote:

BTW cobb has a missfire treshold table base on RPM and load

Does it look something like this? The numbers are probably different as I haven't applied an expression to that, but I'll bet it follows that pattern huh? ;-)

Attachment:

misfire.JPG

Andy

Hey Andy is there a way that i can add the above table to any 02-05 wrx rom?..... it can help out alot with the fake missfires due to big cams on low loads.

legaulois · **Posted:** Sat Nov 27, 2010 7:13 pm

AZ1J500G

X Axis - D4CF0
Y Axis - D4CB0
Table - D4D04

RomRaider

Ignition Dwell - New Definitions

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