[Diy_efi] Knock sensor Q

Thu Oct 31 05:15:37 GMT 2002

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I can't help you with the Knock sensor.  How accurate was yor FJO WB? I =
haven't had a chance to test mine against any others.
Justin Starkey
www.VelocityMustangPerformance.com
**Quote Original E-Mail In Reply**
  ----- Original Message -----=20
  From: Grant Beaty=20
  To: diy_efi at diy-efi.org=20
  Sent: Sunday, October 27, 2002 11:22 PM
  Subject: [Diy_efi] Knock sensor Q

  Has anyone ever seen a knock sensor, or even a ECU, go bad & trigger =
knock sooner than others?

  My car actually makes peak power with an a/f of about 10.5:1 on pump =
gas. It doesn't matter if the boost is 15 or 19, it just pulls too much =
timing. Leaning out from mid-high 10s to 12.0: lost 5rwhp, and its even =
worse in the 1/4 mi, where it at WOT longer (2-3 mph would be lost with =
a similar tuning change).

  I've done a plug chop on the dyno, and it didn't show any cylinder =
imbalance. Compression is 172-175 in all cylinders. My FJO WB has been =
verified against others. Carbon build up isn't possible with my driving =
style. So the only thing left to check is the electronics, and new knock =
sensors aren't cheap, so I'm asking here first.

  Thanks for any help,
  Grant Beaty
  '97 Toyota Supra T66 6-speed

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<DIV><FONT face=3DArial size=3D2>I can't help you with the Knock =
sensor.&nbsp; How=20
accurate was yor FJO WB? I haven't had a chance to test mine against any =

others.</FONT></DIV>
<DIV>Justin Starkey<BR><A=20
href=3D"http://www.VelocityMustangPerformance.com">www.VelocityMustangPer=
formance.com</A><BR>**Quote=20
Original E-Mail In Reply**</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dgbeaty at ufl.edu href=3D"mailto:gbeaty at ufl.edu">Grant =
Beaty</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Ddiy_efi at diy-efi.org=20
  href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, October 27, 2002 =
11:22=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Diy_efi] Knock sensor =
Q</DIV>
  <DIV><BR></DIV>
  <DIV><FONT color=3D#000000 size=3D2>Has anyone ever seen a knock =
sensor, or even a=20
  ECU, go bad &amp; trigger knock sooner than others?</FONT></DIV>
  <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT color=3D#000000 size=3D2>My car actually makes peak power =
with an a/f=20
  of about 10.5:1 on pump gas. It doesn't matter if the boost is 15 or =
19, it=20
  just pulls too much timing. Leaning out from mid-high 10s to 12.0: =
lost 5rwhp,=20
  and its even worse in the 1/4 mi, where it at WOT longer (2-3 mph =
would be=20
  lost with a similar tuning change).</FONT></DIV>
  <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT color=3D#000000 size=3D2>I've done a plug chop on the dyno, =
and it=20
  didn't show any cylinder imbalance. Compression is 172-175 in all =
cylinders.=20
  My FJO WB has been verified against others. Carbon build up isn't =
possible=20
  with my driving style. So the only thing left to check is the =
electronics, and=20
  new knock sensors aren't cheap, so I'm asking here first.</FONT></DIV>
  <DIV><FONT color=3D#000000 size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT color=3D#000000 size=3D2>Thanks for any help,</FONT></DIV>
  <DIV><FONT color=3D#000000 size=3D2>Grant Beaty</FONT></DIV>
  <DIV><FONT size=3D2>'97 Toyota Supra T66=20
6-speed</FONT></DIV></BLOCKQUOTE></BODY></HTML>

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