[Diy_efi] RE: [SPAM] - Diy_efi Digest, Vol 4, Issue 9 - Email found in subject

Mon Jun 6 00:51:44 UTC 2005

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Today's Topics:

   1. Re: Making a fake O2 (jeff matthews)
   2. Re: Making a fake O2 (Marc Reviel)

----------------------------------------------------------------------

Message: 1
Date: Sat, 04 Jun 2005 23:14:02 -0400
From: "jeff matthews" <maple69vt at hotmail.com>
Subject: Re: [Diy_efi] Making a fake O2
To: diy_efi at diy-efi.org
Message-ID: <BAY101-F17992258643CD6D563B74EB7F80 at phx.gbl>
Content-Type: text/plain; format=flowed

I'm extremely surprised, especially with the Miata, that you can open the
throttle and accelerate long enough to make boost, but not to switch the ECU
out of closed-loop.  A lot of engines would go bang if you tried to run them
that way, with narrow-band closed-loop.

Yes, these engines will go bang if you boost w/ the ECU in  closed loop, esp
the protege 2.0L's.  That is why, using a map sensor and simple comparator
circuit, I send the ECU a signal of .39v under boost.  Otherwise it will try
and lean out too much and BOOM!
W/ the miata I see boost around 2K rpm partial throttle,  5psi by 2200rpm
WOT and full boost  by 2600-2800rpm's (have run as much as 12psi all the way
to 7200rpm's.)  I keep it set @ ~=8psi though,  That helps keep it civil :)
over 10K miles this way--and stock clutch

On the Porsche set up, what does your A/F's look like?
Stock ecu?  No fuel control? or can you 'chip' that ecu?

FWIW  I went threw many stages with the miata, earlier ones did not use any
o2 modding either ,including using an AFPR, worked well never had any
problems and I know of a few people that don't use any O2 mods on their
OBDII's-- But it is a mandatory on the protege , so it wasn't anything to
throw an extra one on the miata.  I know of others (mostly supercharged
miata's) that complained of a slight hesitation in partial throttle
response,  which after they 'clamped' their O2 voltage, the problem went
away.

Best regards,
JEFF

<br><br><br>From: "Marc Reviel"
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<diy_efi at diy-efi.org><br>Subject: Re: [Diy_efi] Making a fake
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19:14:12.0157 (UTC) FILETIME=[97408ED0:01C56939]<br><br><br>----- Original
Message ----- From: "Adam Wade"
<espresso_doppio at yahoo.com><br>To: 
<diy_efi at diy-efi.org><br>Sent: Friday, June 03, 2005 7:08
PM<br>Subject: RE: [Diy_efi] Making a fake O2<br><br><br>>--- jeff
matthews <maple69vt at hotmail.com> wrote:<br>><br>>>I have a
1996 Miata and 2003 Protigi.  They both<br>>>have the stock ECU's.  
But because I get board<br>>>around the garage they both are
turbocharged.  They<br>>>both need to run richer under
boost.<br>>>They both have piggy back fuel and timing
controls,<br>><br>>Ahh.  THAT answered my question.  It's not the
stock<br>>ECU dealing with the boost, it's an outboard<br>>controller.

I'm extremely surprised, especially with >the Miata, that you can
open the throttle and >accelerate long enough to make boost, but not
to >switch the ECU out of closed-loop. A lot of engines >would
go bang if you tried to run them that way, with >narrow-band
closed-loop. FYI, I am just finishing a prototype of a twin turbo
upgrade for the Porsche Boxster. The test mule is a 1999 model, 2.5L, 11:1,
no variable cam timing, and last year before they went to e-throttle. I
designed it for low-boost/earliest spool up - 2000rpm = 2.5psi, 2400 = 5psi.

During part-throttle/mild acceleration, it is almost always running positive
boost, and does remain in closed-loop. I have about 1200 miles heavy testing
on it. So far, no issues at all (not even a CEL). No piggyback stuff, stock
ECU
programming. -Marc <snip> ___________________
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------------------------------

Message: 2
Date: Sun, 5 Jun 2005 00:56:09 -0500
From: "Marc Reviel" <marc at powerlogix.com>
Subject: Re: [Diy_efi] Making a fake O2
To: <diy_efi at diy-efi.org>
Message-ID: <000b01c56993$462d73a0$6400a8c0 at delllaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
	reply-type=response

----- Original Message -----
From: "jeff matthews" <maple69vt at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, June 04, 2005 10:14 PM
Subject: Re: [Diy_efi] Making a fake O2

> On the Porsche set up, what does your A/F's look like?
> Stock ecu?  No fuel control? or can you 'chip' that ecu?

I have several options on fuel control.  However,   Since  it was working 
reasonably well, I left it alone until I finished all the other aspects of 
the design. It is a T-Mass/MAF based system, and compensates as expected for

the boost.  While on boost, A/F is around .85L < 4K, and around .90-.92 >4K.

So, top end will require a little correction - and that can be done in a 
variety of ways. Probably will choose to alter the ECU programming since 
that is the cleanest/cheapest.

-Marc 

------------------------------

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