[Diy_efi] Knock sensor Q
Grant Beaty
gbeaty at ufl.edu
Sat Nov 2 17:11:24 GMT 2002
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I just measured the 1st knock sensor's frequency with my ghetto-o-scope =
( http://polly.phys.msu.su/~zeld/oscill.html ), and it appeared to have =
a period of about .08ms at 4k RPMs, whereas the repair manual states it =
should have a frequency of .123ms. Does anyone know if this is a =
signifant difference? (I know there is virtually no chance of anyone =
have any idea, but hey, it worth a try since sensors are $130 a pop).
Thanks for any help?
Grant
-----Original Message-----
From: Grant Beaty <gbeaty at ufl.edu>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Tuesday, October 29, 2002 2:20 PM
Subject: Re: [Diy_efi] Knock sensor Q
=20
=20
It read the same as another FJO they had at the dyno, and the same =
as a friend's FJO, and the same as another friend's FJO, etc.
=20
Grant
-----Original Message-----
From: Justin Starkey @ VMP <justinv6 at bellsouth.net>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: Monday, October 28, 2002 12:05 PM
Subject: Re: [Diy_efi] Knock sensor Q
=20
=20
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
=20
=20
Has anyone ever seen a knock sensor, or even a ECU, go bad & =
trigger knock sooner than others?
=20
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).
=20
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.
=20
Thanks for any help,
Grant Beaty
'97 Toyota Supra T66 6-speed
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<DIV><FONT color=3D#000000 size=3D2>I just measured the 1st knock =
sensor's frequency=20
with my ghetto-o-scope ( <A=20
href=3D"http://polly.phys.msu.su/~zeld/oscill.html">http://polly.phys.msu=
.su/~zeld/oscill.html</A>=20
), and it appeared to have a period of about .08ms at 4k RPMs, whereas =
the=20
repair manual states it should have a frequency of .123ms. Does anyone =
know if=20
this is a signifant difference? (I know there is virtually no chance of =
anyone=20
have any idea, but hey, it worth a try since sensors are $130 a=20
pop).</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Thanks for any help?</FONT></DIV>
<DIV><FONT size=3D2>Grant</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; PADDING-LEFT: =
5px">
<DIV><FONT face=3DArial size=3D2><B>-----Original =
Message-----</B><BR><B>From:=20
</B>Grant Beaty <<A=20
href=3D"mailto:gbeaty at ufl.edu">gbeaty at ufl.edu</A>><BR><B>To: =
</B><A=20
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> <<A=20
=
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A>><BR><B>Dat=
e:=20
</B>Tuesday, October 29, 2002 2:20 PM<BR><B>Subject: </B>Re: =
[Diy_efi] Knock=20
sensor Q<BR><BR></DIV></FONT>
<DIV><FONT color=3D#000000 size=3D2>It read the same as another FJO =
they had at=20
the dyno, and the same as a friend's FJO, and the same as another =
friend's=20
FJO, etc.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Grant</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; =
PADDING-LEFT: 5px">
<DIV><FONT face=3DArial size=3D2><B>-----Original=20
Message-----</B><BR><B>From: </B>Justin Starkey @ VMP <<A=20
=
href=3D"mailto:justinv6 at bellsouth.net">justinv6 at bellsouth.net</A>><BR>=
<B>To:=20
</B><A =
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A> <<A=20
=
href=3D"mailto:diy_efi at diy-efi.org">diy_efi at diy-efi.org</A>><BR><B>Dat=
e:=20
</B>Monday, October 28, 2002 12:05 PM<BR><B>Subject: </B>Re: =
[Diy_efi]=20
Knock sensor Q<BR><BR></DIV></FONT>
<DIV><FONT face=3DArial size=3D2>I can't help you with the Knock =
sensor. How accurate was yor FJO WB? I haven't had a =
chance to=20
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=20
style=3D"BORDER-LEFT: #000000 solid 2px; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"=20
dir =3D ltr>
<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 href=3D"mailto:gbeaty at ufl.edu" =
title=3Dgbeaty at ufl.edu>Grant Beaty</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:diy_efi at diy-efi.org"=20
title=3Ddiy_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=20
11:22 PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Diy_efi] =
Knock sensor=20
Q</DIV>
<DIV><BR></DIV>
<DIV><FONT color=3D#000000 size=3D2>Has anyone ever seen a =
knock sensor,=20
or even a ECU, go bad & trigger knock sooner than=20
others?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>My car actually makes =
peak power=20
with an a/f of about 10.5:1 on pump gas. It doesn't matter =
if the=20
boost is 15 or 19, it just pulls too much timing. Leaning =
out from=20
mid-high 10s to 12.0: lost 5rwhp, and its even worse in the =
1/4 mi,=20
where it at WOT longer (2-3 mph would be lost with a similar =
tuning=20
change).</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>I've done a plug chop on =
the dyno,=20
and it didn't show any cylinder imbalance. Compression is =
172-175 in=20
all cylinders. My FJO WB has been verified against others. =
Carbon=20
build up isn't possible with my driving style. So the only =
thing=20
left to check is the electronics, and new knock sensors =
aren't=20
cheap, so I'm asking here first.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </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></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>=
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