Nother ALDL grabbing method

[Dave Zug.]

I'd think it would be hard to accurately pin down the interspacing with all
the noise I'd expect from hooking up that way, to the spark! pretty neet
though.  probably have to use programming to assume the next pulse was
shorter than the previous pulse to weed out falsies. probably very involved.

With ALDL, interspacing is easy - should be consistant but I should not
assume this - I could use an algorithm to "autobaud" then read the states
allowing for some timing drift if i have to. Presently I assume a perfectly
clocked signal.

Could hook to and record VSS pulse as well to get more accurate 1/4 time
(remember a long time ago I was messing with that - dropped it too)
   yea I know tire slippage yea yea ;-)


----- Original Message -----
From: Marteney, Steven J. <smarteney at xlvision.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, February 15, 2000 2:47 PM
Subject: RE: Nother ALDL grabbing method


> This is definitely a viable option and some similar stuff has been done in
> the past (automobile related, not ALDL specific).  There is a group of
guys
> making spark sensors (coil of wire wrapped around spark plug wire + some
> conditioning circuitry) and tying the spark signal into the audio input of
a
> camcorder.  In this way, you just get square waves input into the audio
> stream.  The goal is you mark off stuff like 1/4 mile strips or record
time
> stamps when your car reaches 60mph.  The audio track is then imported into
a
> PC via sound card and decoded by software they wrote to get some
horsepower
> and torque curves.  (Of course, it helps to have an accurate weight for
your
> vehicle, gearing, etc.)
>
> I don't know the link but it should turn up if you some web searching for
> "desktop dyno", which was what I was looking for at the time (about a year
> ago).  You may get some "ideas" by paying them a visit.
>
> Anybody out there the ones who were doing this?
>
> Steve
>
> -----Original Message-----
> From: Dave Zug. [mailto:dzug at delanet.com]
> Sent: Tuesday, February 15, 2000 2:15 PM
> To: gmecm at diy-efi.org
> Subject: Re: Nother ALDL grabbing method
>
>
> Its that its based on not having to buy anything (long as you own a
laptop)
> other than a cheap cable.
>
> Just a concept really - but I hope to try some recordings next.
>
> thats ok, I asked so I could get feedback - thanks!
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