That is interesting re: the 12V to ignitors. I noticed the ramp off in the rising edge of the coil trigger signal too. So the "5V logic signal" could be just a Darlington VBE then?
Have attached a similar trace: R33 CYL1 Ignition vs CAS SYNC/POS.
Nissan Skyline R33 S2 (1996)
Re: Nissan Skyline R33 S2 (1996)
Yes, exactly, and I've been saying this for years (3 of them) and knew the MS2 ignition on my truck sucked badly, but didn't know why until I got my hands dirty and "proved" it. This is nice confirmation from an OEM box.
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Re: Nissan Skyline R33 S2 (1996)
Yeah, I saw the scope trace and thought that it was 5v out, until I was poking around inside the stock ECU and noticed there wasn't any regulated voltage going to the driver chip for the ignition, just 12v. So all you're seeing is what isn't dropped over the BE junction.
Re: Nissan Skyline R33 S2 (1996)
Did some shitwork on the data collected from the CAS, counted transitions of POS relative to REF.
REF Low->High - POS High
47 POS
REF High->Low - POS Low
73 POS - Cyl1 IGN
REF Low->High - POS High
39 POS
REF High->Low - POS Low
81 POS - Cyl5 IGN
REF Low->High - POS High
32 POS
REF High->Low - POS High
88 POS - Cyl3 IGN
REF Low->High - POS High
23 POS
REF High->Low - POS Low
97 POS - Cyl6 IGN
REF Low->High - POS High
16 POS
REF High->Low - POS High
104 POS - Cyl2 IGN
REF Low->High - POS High
8 POS
REF High->Low - POS High
112 POS - Cyl4 IGN
Total POS transitions in a full cycle of CAS: 720 (as expected)
REF Low->High - POS High
47 POS
REF High->Low - POS Low
73 POS - Cyl1 IGN
REF Low->High - POS High
39 POS
REF High->Low - POS Low
81 POS - Cyl5 IGN
REF Low->High - POS High
32 POS
REF High->Low - POS High
88 POS - Cyl3 IGN
REF Low->High - POS High
23 POS
REF High->Low - POS Low
97 POS - Cyl6 IGN
REF Low->High - POS High
16 POS
REF High->Low - POS High
104 POS - Cyl2 IGN
REF Low->High - POS High
8 POS
REF High->Low - POS High
112 POS - Cyl4 IGN
Total POS transitions in a full cycle of CAS: 720 (as expected)
Re: Nissan Skyline R33 S2 (1996)
Reformatted:
It's not clear to me from the above:
1) Whether this is raw or inverted data
2) What "POS High" means, guessing state of counter track on transition of window track.
I'd have expected a count per window stating whether the window was high or low, and whether this was raw or inverted.
So, is my interpretation correct, and is this raw data or inverted? I'm guessing "yes, and raw".
Fred.
Or: 120, 120, 120, 120, 120, 120 :-)Hell Fire wrote:Code: Select all
47 POS HIGH window 73 POS low window 39 POS HIGH window 81 POS low window 32 POS HIGH window 88 POS low window 23 POS HIGH window 97 POS low window 16 POS HIGH window 104 POS low window 8 POS HIGH window 112 POS low window
It's not clear to me from the above:
1) Whether this is raw or inverted data
2) What "POS High" means, guessing state of counter track on transition of window track.
I'd have expected a count per window stating whether the window was high or low, and whether this was raw or inverted.
So, is my interpretation correct, and is this raw data or inverted? I'm guessing "yes, and raw".
Fred.
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Re: Nissan Skyline R33 S2 (1996)
This is raw, and yeah, just the state of the counter at the transition of the window. Doesn't add anything really, was just something extra about the signal I chucked in.
Re: Nissan Skyline R33 S2 (1996)
On a small update, stock RB25 looks to use at least what should be close enough to the standard Denso sensor to match the temp curves already mapped.