[Diy_efi] Custom detonation detecting

[Bevan Weiss]

It might almost pay you to take a look into ION detection in the post
ignition chamber.
It would be the preferable way to go in my opinion.  You don't have to worry
so much about outside noise interferring with your measurements, and other
oddities.  Plus it allows you to tune direct from the ION info, you could
apply some kind of automated learning to the process if needed.

> ----- Original Message -----
> From: Jon Prevost
> To: diy_efi at diy-efi.org
> Sent: Monday, November 11, 2002 5:30 PM
> Subject: [Diy_efi] Custom detonation detecting
>
>
> It's rather simple. BTW, all of the questions I ask on this subject are
> completely non-profit if that makes any bit of a difference. Anyways, I'm
on
> the formula SAE team at Ohio State University and we've got a professional
> engine dyno setup. www.formulabuckeyes.com is our website.
> We're using a Haltech ecm to do control fuel and spark. Right now I'm
> designing data aq and I want to make a way to detect detonation. I was
> thinking about using a knock sensor and recording it with the data aq
along
> with torque. When we advance too far and torque takes a nose dive it would
> make sence that at that frequency there is detonation? If not, what would
be
> a good way to set this up?
> The engine is a 16valve F4i and it's an all stock bottom end.
> What I'm trying to do is program a nifty program that'll self tune for
peak
> fuel and spark to give us a close estimate, then if things work out go
ahead
> and lean out the map till there is a decrease in torque. This isn't going
to
> happen overnight but it's a winter project that I feel could save us lots
of
> time after making dramatic changes with the intake design and exhaust etc.
> Does anybody know what frequency range is needed in a knock sensor for
this
> little 4 banger? I was thinking about starting with a simple knock sensor
> from a GM 4 cylinder cav. The sensor will be located in the block
somewhere,
> not sure exactly where though. The sensor will also not be on the car when
> it's in the field, just during dyno runs.
> , Jon Prevost
>
>
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