On a slightly modded car, are there significant gains from optimising timing?
14 March 2002, 02:39 PM
#31
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John,
I don't wish to change the direction of this thread to discuss knock detection, but, I had also considered using a uC for this, however, how long does a 'knock' last? will the sample rate ever be fast enough to ensure capturing the peak?
I suppose analysing a knock link is a good way to get some further info but I would have though that understanding how the std ECU reacts to different levels of knock would be more useful if you want to know how to integrate it into a Boost/Ignition 'optimiser'.
Keep up the good work.
Andrew...
I don't wish to change the direction of this thread to discuss knock detection, but, I had also considered using a uC for this, however, how long does a 'knock' last? will the sample rate ever be fast enough to ensure capturing the peak?
I suppose analysing a knock link is a good way to get some further info but I would have though that understanding how the std ECU reacts to different levels of knock would be more useful if you want to know how to integrate it into a Boost/Ignition 'optimiser'.
Keep up the good work.
Andrew...
14 March 2002, 02:48 PM
#32
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http://home.netcom.com/~bsundahl/kno...nockSounds.htm
16ms on the top picture - they are the backslash \ light blue strokes at 6KHz.
The Atmel 90S4433 runs at 8 MIPS and has an ADC conversion time of 65-260uS. I'll have a look at the signal processing that the Knocklink does at some point.
No worry about going off topic - this is entirely on-topic!
[Edited by john banks - 3/14/2002 3:09:01 PM]
14 March 2002, 05:22 PM
#36
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No I mean design and build the circuits as well. It's a "hobby".
Like this one which is an EBC:
[Edited by john banks - 3/14/2002 5:26:38 PM]
Like this one which is an EBC:
[Edited by john banks - 3/14/2002 5:26:38 PM]
14 March 2002, 05:59 PM
#38
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I have a loom to which I can attach a working example, but it doesn't use RPM mapping yet. I've been thinking about your WI knock trigger - will post new thread on that 
15 March 2002, 04:18 PM
#39
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Evo Andy
Thanks for those fuel calcs, that seems to tie up nicely with my actual test results
One thing I have become more aware of is fuel surge, from 1/3 tank down I'm getting fuel pressure fluctuations (which I have no safety margin for)
Time for fuel system mods to fit a surge tank I think.
cc
Thanks for those fuel calcs, that seems to tie up nicely with my actual test results
One thing I have become more aware of is fuel surge, from 1/3 tank down I'm getting fuel pressure fluctuations (which I have no safety margin for)
Time for fuel system mods to fit a surge tank I think.
cc
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