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knock.htm
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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- </font> <a href="http://www.fiero.nl/">
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<BR>- </font> <a href="http://www.60degreev6.com">
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%m/%d/%Y" startspan -->09/11/2003<!--webbot bot="Timestamp" i-checksum="12524" endspan --></font><P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<P> </P></TD>
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<TD width="50%" background="http://www.dohcfiero.com/Images/topbg.gif"
bgColor=#333366 height="8"><b>
<font face="Verdana" size="1" color="#FFFFFF">Knock Detection
Circuit</font></b></TD>
<TD align=right width="50%"
background="http://www.dohcfiero.com/Images/topbg.gif" bgColor=#333366 height="8"><B>
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<TD bgColor=#000000 colSpan=2 height="19">
<p align="left">The reason for this circuit is simply that
standard Fieros do not come with a knock sensor provision. While
the TDC/DOHC ECUs DO have a knock provision, the Haltechs do
not. If you are running the Haltech, chances are pretty good
that you are turbocharging the motor, which means that knock
detection becomes even more critical for maximum performance and
to lessen the chances for engine failure due to detonation.
While this circuit is not active, meaning it will not adjust the
timing automatically, it WILL let you know that a timing
adjustment must be made.<p align="left"> <p align="left">
Here's the schematic<p align="center">
<img border="0" src="http://www.dohcfiero.com/Images/knock/Knock%20Indicator.jpg" width="690" height="535"><br>
<p align="left">
<font size="2"><b>Parts List</b></font><p align="left">
<font style="font-size: 9pt">Most of these parts can be located
at your local Radio Shack or can be ordered via online vendors
such as Mouser, Digikey, JameCo, etc...</font><p align="left">
<span style="font-size: 9pt">Don't forget to pick up a
breadboard and project box to mount all of the components in.
Nice feature is that you can remotely mount the switches and the
LED indicator to your dash and hide the project box for that
stealth look. Try to keep all leads as short as possible.</span><p align="left">
<u><font size="1"><b>Capacitors</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber1">
<tr>
<td width="8%">C1</td>
<td width="58%">.1uF Non Polarized Disc</td>
</tr>
<tr>
<td width="8%">C2</td>
<td width="58%">.01uF Non Polarized Disc</td>
</tr>
<tr>
<td width="8%">C3</td>
<td width="58%">1uF Tantalum</td>
</tr>
</table>
<p align="left">
<u><font size="1"><b>Resistors</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber2">
<tr>
<td width="9%">R1</td>
<td width="62%">390 Ohm, 1/2 Watt, 5%</td>
</tr>
<tr>
<td width="9%">R2</td>
<td width="62%">100K Ohm, 1/4 Watt, 5%</td>
</tr>
<tr>
<td width="9%">R3</td>
<td width="62%">15K Ohm, 1/4 Watt, 5%</td>
</tr>
</table>
<p align="left">
<u><font size="1"><b>IC</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber3">
<tr>
<td width="9%">IC1</td>
<td width="62%">LM555 or Equivilent</td>
</tr>
</table>
<p align="left">
<u><font size="1"><b>Diodes</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber4">
<tr>
<td width="8%">D1</td>
<td width="58%">1N914</td>
</tr>
</table>
<p align="left">
<u><font size="1"><b>Switches</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber5">
<tr>
<td width="9%">SW1</td>
<td width="62%">Alarm On/Off</td>
</tr>
<tr>
<td width="9%">SW2</td>
<td width="62%">Momentary Activation, Normally Open</td>
</tr>
</table>
<p align="left">
<u><font size="1"><b>Piezo Buzzer</b></font></u><p align="left">
<table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="30%" id="AutoNumber6">
<tr>
<td width="9%">SG1</td>
<td width="62%">85 DB 3/4"</td>
</tr>
</table>
<p align="left">
<p align="left">
<span style="font-size: 9pt">Be sure to take your time
when soldering to ensure that you have a good connection without
an excessive amount of solder. Also make sure that all
connections going to the Knock Sensor are soldered and heat
shrink protected for a good connection. The knock sensor should
be the standard GM type, but it's always wise to replace it
while the motor is out of the vehicle.</span><p align="left">
<p align="right">
<font style="font-size: 9pt"><b>Author: 85frankenstein</b></font></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
<P class=newstext align=center>
<font color="#FFFFFF" face="Verdana" size="1">Copyright © 2003. All Rights
Reserved.<BR> </font></P></TD>
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