[Diy_efi] Making a fake O2
jeff matthews
maple69vt
Sun Jun 5 02:43:19 UTC 2005
The fiat/Yugo thing sounds like a lot of fun!!
Too cool...
Best regards,
JEFF
<br><br><br>From: "turbofiat at hotpop.com"
<turbofiat at hotpop.com><br>Reply-To: turbofiat at hotpop.com,
diy_efi at diy-efi.org<br>To: diy_efi at diy-efi.org<br>Subject: RE: [Diy_efi]
Making a fake O2<br>Date: Sat, 4 Jun 2005 03:56:50 -0400<br>MIME-Version:
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diy_efi-bounces at diy-efi.org<br>X-OriginalArrivalTime: 04 Jun 2005
07:59:38.0609 (UTC) FILETIME=[5B233E10:01C568DB]<br><br>You sound like me. I
turbocharged my 1980 Fiat Spider about 8 years ago<br>then recently
turbocharged a cabrurated 1987 Yugo with a 1500 Fiat
engine.<br><br>http://users.chartertn.net/jseabolt/<br><br>On my L-jet Fiat,
I've been told the ECU ignores the signal from the O2<br>sensor under wide
open throttle. But because I can reach boost without even<br>flooring the
accelerator this method doesn't work.<br><br>It took me 6 months to figure
out that the ECU was leaning the mixture out<br>under boost.<br><br>I found
a really easy method. I put a pressure switch between the ECU and O<br>2
sensor so as soon as I hit boost, the ECU runs blind.<br><br>I don't know if
this work on a modern fuel injection system. It might start<br>flashing
codes or something.<br><br><br><br>Original
Message:<br>-----------------<br>From: jeff matthews
maple69vt at hotmail.com<br>Date: Fri, 03 Jun 2005 19:46:19 -0400<br>To:
diy_efi at diy-efi.org<br>Subject: RE: [Diy_efi] Making a fake
O2<br><br><br><html><div
style='background-color:'><P><BR><BR></P><br><DIV><br><DIV
class=RTE><br><P>I have a 1996 Miata and 2003 Protege. They both
have the stock ECU's. <br>But because I get bored around the garage they
both are turbocharged. They<br>both need to run richer under boost.
(wouldn't want to let the ECU see<br>rich why boosting because as we all
know the stock ecu will try and lean<br>out the mixture). The stock ecu on
the miata stays in closed loop mode<br>until around 3200 rpm's and the
protege is even longer(with even more TPS<br>movement -like 80%). with the
exception of WOT. They both have piggy back<br>fuel and timing controls, but
I don't run over 10psi either...Also on the<br>protege it had 2 cats and 2
O2's. I had to remove the 1st cat to make room<br>for the turbo. I had to
move the 2nd O2 behind the 2nd cat so I would not<br>get a CEL--the first O2
resides in the D/P along with the WBO2(approx<br>19").
<BR></P><br><P>"I don't think there are any vehicles
ever made<BR>that operate in<br>closed-loop mode while
accelerating"<BR></P><br><P>I believe that Later
Porsche Turbo's (can't afford one so no clue what<br>model) always run
closed loop including WOT. Obviously not narrow-band O2<br>targeting
stoichiometric- but I thought it was
interesting.<br><BR><BR></P></DIV><br><P>I
have never run without the O2's connected. So I don't know what
would<br>happen. But on my 1988 Nissan pulsar it runs fine and the O2 AND
TPS is<br>disconnected...
</P><br><P><BR><BR><BR>Best regards,
</P><br><DIV></DIV>JEFF<br><DIV></DIV><BR><BR><BR>From:
Adam Wade<br><espresso_doppio at yahoo.com><BR>Reply-To:
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RE: [Diy_efi] Making a fake O2<BR>Date:<br>Thu, 2 Jun 2005 23:30:17
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FILETIME=[77D88850:01C56857]<BR><BR>--- jeff
matthews<br><maple69vt at hotmail.com> wrote:<BR><BR>> I
fake out my O2 sensor on Both my<br>cars everytime I<BR>> boost
(which is almost every time I<br>shift:)!<BR><BR>I'm curious.
What ECUs are you running with, are<br>they<BR>designed (or at least
adapted) for use on turbocharged<BR>vehicles<br>(I'm<br>assuming
you're turbocharging here,<BR>yes?), and what happens if you
don't<br>"fake out" the<BR>ECU? I don't think there are any
vehicles ever<br>made<BR>that operate in closed-loop mode while
accelerating,<BR>especially<br>if the acceleration is more than a
moderate<BR>level (in my mind, that<br>would be a great way to
ruin<BR>an engine very quickly, assuming you're<br>talking
about<BR>a narrow-band O2 targeting
stoichiometric).<BR><BR>| 82<br>Honda CX500 Turbo (Cassandra)
90 Kwak Zephyr 550 (Daphne) |<BR>| "It was<br>like an emergency
ward after a great catastrophe; it |<BR>| didn't<br>matter what
race or class the victims belonged to. |<BR>| They were
all<br>given the same miracle drug, which was coffee. |<BR>| The
catastrophe in<br>this case, of course, was that the sun |<BR>|
had come up<br>again." -Kurt Vonnegut
|<BR>| M/C Fuel Inj. Hndbk. @<br>Amazon.com -
http://tinyurl.com/6o3ze<br>|<BR><BR><BR><BR>__________________________________<BR>Yahoo!
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