1200rpm cutt off
#21
Boost Czar
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Join Date: May 2005
Location: Chantilly, VA
Posts: 79,494
Total Cats: 4,080
are you on stock coils? your running dwell is way too low.
should be 5ms running and a discharge period of closer to .7ms to 1ms. it probably cant charge enough to make spark when you get above 2000rpm. plus your fueling is completely whack.
should be 5ms running and a discharge period of closer to .7ms to 1ms. it probably cant charge enough to make spark when you get above 2000rpm. plus your fueling is completely whack.
#27
Well an update
With the oscope, going over it more and testing newer non hires firmware 029y4
I noticed if I set to 5ms which leads me to hitting out at a max of 1300 rpms before it has the odd problem
Spark inversion set to yes
IF I set spark inverted to no
It registers on the oscope as it would if above 1300 rpms on yes
But once over 1300 rpms on no it registers like it would below 1300 rpms on yes
Any thoughts on this odd problem?
Changing running dwell seems to alter where this point is at, but it also alters how much gets to the ignitor, tried 1ms but car wouldn't work at that, 1.5ms was the lowest. Even that I hear is to low for the miata iginitor. Something sounds wrong.
Now I admit I'm not the sharpest at reading oscope outputs, first one to use but this seems to me what is happening.
With the oscope, going over it more and testing newer non hires firmware 029y4
I noticed if I set to 5ms which leads me to hitting out at a max of 1300 rpms before it has the odd problem
Spark inversion set to yes
IF I set spark inverted to no
It registers on the oscope as it would if above 1300 rpms on yes
But once over 1300 rpms on no it registers like it would below 1300 rpms on yes
Any thoughts on this odd problem?
Changing running dwell seems to alter where this point is at, but it also alters how much gets to the ignitor, tried 1ms but car wouldn't work at that, 1.5ms was the lowest. Even that I hear is to low for the miata iginitor. Something sounds wrong.
Now I admit I'm not the sharpest at reading oscope outputs, first one to use but this seems to me what is happening.
#28
Back with more info
More interesting information off the oscope, setting the crank trigger settings as a 4+1 instead of the stock miata 4+2 makes the output from the spark out work fine, as rpm increases the trigger events start happening closer together, yet it doesn't change how the output is showing at any certain point.
I used settings from this page http://msextra.com/forums/viewtopic.php?f=4&t=27543
so far it seems to only do it with this miata CAS setup and all firmware versions I've tried so far
029q 029y4 and newest hi res. I think its possibily a software problem, some overflow\stack overflow that cuasing the spill over.
ok so I put it back to stock miata settings cept now I changed it to dual dizzy = yes, and the output looks like it should.
More interesting information off the oscope, setting the crank trigger settings as a 4+1 instead of the stock miata 4+2 makes the output from the spark out work fine, as rpm increases the trigger events start happening closer together, yet it doesn't change how the output is showing at any certain point.
I used settings from this page http://msextra.com/forums/viewtopic.php?f=4&t=27543
so far it seems to only do it with this miata CAS setup and all firmware versions I've tried so far
029q 029y4 and newest hi res. I think its possibily a software problem, some overflow\stack overflow that cuasing the spill over.
ok so I put it back to stock miata settings cept now I changed it to dual dizzy = yes, and the output looks like it should.
Last edited by Techsalvager; 09-03-2010 at 01:12 PM.
#29
Back with more info
More interesting information off the oscope, setting the crank trigger settings as a 4+1 instead of the stock miata 4+2 makes the output from the spark out work fine, as rpm increases the trigger events start happening closer together, yet it doesn't change how the output is showing at any certain point.
I used settings from this page http://msextra.com/forums/viewtopic.php?f=4&t=27543
so far it seems to only do it with this miata CAS setup and all firmware versions I've tried so far
029q 029y4 and newest hi res. I think its possibily a software problem, some overflow\stack overflow that cuasing the spill over.
ok so I put it back to stock miata settings cept now I changed it to dual dizzy = yes, and the output looks like it should.
More interesting information off the oscope, setting the crank trigger settings as a 4+1 instead of the stock miata 4+2 makes the output from the spark out work fine, as rpm increases the trigger events start happening closer together, yet it doesn't change how the output is showing at any certain point.
I used settings from this page http://msextra.com/forums/viewtopic.php?f=4&t=27543
so far it seems to only do it with this miata CAS setup and all firmware versions I've tried so far
029q 029y4 and newest hi res. I think its possibily a software problem, some overflow\stack overflow that cuasing the spill over.
ok so I put it back to stock miata settings cept now I changed it to dual dizzy = yes, and the output looks like it should.
#38
riddle me this
One of my spark outputs at idle looks like its full 5v across the scope
I attached the oscope to the MS while running at idle
one of the spark outputs looks normal _-___-___-___etc
The bad one just looks like this ---------- full on 5 volt with small up angles at certain points of firing. Thoughts?
You can get a 4 cylinder to run on 2 cylinders, smell like gas and have good AFRs at idle
One of my spark outputs at idle looks like its full 5v across the scope
I attached the oscope to the MS while running at idle
one of the spark outputs looks normal _-___-___-___etc
The bad one just looks like this ---------- full on 5 volt with small up angles at certain points of firing. Thoughts?
You can get a 4 cylinder to run on 2 cylinders, smell like gas and have good AFRs at idle
Last edited by Techsalvager; 09-10-2010 at 07:34 PM.