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Location:
Hobart
Registered:
June 2002
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Re: testing Jaycar HEI tach signal for Megasquirt
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Fri, 10 December 2004 23:13
 
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nah i never tried dave cap, i didn't think it would help my problem since my spikes weren't higher than my highest operating rpm anyway (don't want to filter out that frequency  )
my hardware is standard with r10 changed. (oh and q1 mounted on case, caus' im running low-z injectors with pwm, fried q1 once)
i think there may be some slight differences between the tach filtering done in software between the diffeent firmwares. It could just be that the filtering is performed asynchronously and timing it effected by the extra features in the code (msns-e has a bucket load). I'm pretty sure msns-e has that false trigger filter. Hopefully i will get spark control going over this christmas.
in those emmebedded graphs u just posted - When running HEI, are you triggering from tach signal or -ve coil terminal? probably coil signal, because i dont think the tach signal works with those high value resistors since it is only a 12v signal. I have never run megasquirt without HEI so i can't really say.
Do you have a condenser on the coil? maybe without HEI the dwell time is smaller and therefore the primary ringing is larger and causing extra triggers. By lifting the resistor probably increases the threshold which will trigger megasquirt. Dunno, all just guesses. I would love to investigate more with an oscilloscope.
its good that you tried a bunch of values, i just stopped once it worked well, lol. I dont think higher values of resistors will effect your maximum rpm (unless your spark gets weak at high rpm with less dwell time). The dave cap will turn the input into an RC filter dropping out high frequencies depending on the value of R and C.
Oh btw how did you increase the sample rate of the data logging?
cheers
Chris
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| | Subject | Poster | Date |
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testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 05:52 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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IRA11Y | Fri, 10 December 2004 06:09 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Fri, 10 December 2004 06:15 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 06:41 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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TA-022 | Fri, 10 December 2004 11:32 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 12:41 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Fri, 10 December 2004 23:13 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Sat, 11 December 2004 02:29 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Mon, 13 December 2004 03:57 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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gearb0x | Fri, 10 December 2004 12:52 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Fri, 10 December 2004 12:58 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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gearb0x | Fri, 10 December 2004 13:15 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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RA40Celica | Mon, 13 December 2004 23:31 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Tue, 14 December 2004 06:09 |
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Re: testing Jaycar HEI tach signal for Megasquirt
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oldcorollas | Tue, 14 December 2004 06:12 |
