[Diy_efi] Custom detonation detecting

[Jon Prevost]

Sorry about the html. This is it in just text.
, Jon
----- 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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