[Supras] 550 CC fuel injectors

Fri May 18 01:57:44 CDT 2007

I'm with Jeff on this one,
In Ireland we have very Strict emmissions too, and I manage to get lots of
customers big BHP cars through the tests, and these are non Cat cars.
We use RC injectors as well as the other Named brands, as flow testing over
the years showed the cheap versions to be useless when it came to stable or
being with a close flow rate to each other.

To get cars through, we do the following.

1. Brand new o2 sensor (cheap and makes a big difference)
2. Reliable flow tested injectors such as RC
3. AFPR

On the day of the Test and with the help of a Wideband, we reduce fuel
pressure from base setting until
the ECU is having to fight hard to keep in the 16+ range, then slowly back
it up again until its holding around 15.5-17 AFR's

Marty

----- Original Message -----
From: "Jeff Corbat" <jjcorbat at uwm.edu>
To: <berniek at technicaldevelop.com>
Cc: "SOGI" <supras at supras.com>
Sent: Friday, May 18, 2007 3:43 AM
Subject: Re: [Supras] 550 CC fuel injectors

> I've been running RC550's with the Lex for about 5 yrs now and went
through
> two Wisconsin dyno style tailpipe sniffer style tests with zero issues.  I
> have the Aeromotive slightly scaling back the base fuel pressure.  Going
too
> low will lean you out, raise the NOx level, and trip the test.  Otherwise
> all is good.  Also, to add...I am running no electronic fuel control.
>
> I'd spend the extra $$$ on RC injectors.  They have been ultra reliable
even
> on a car driven very little in the last 5 years.  Even with the car
sitting
> on blocks from Oct ~ April, it starts right up when called to duty.
>
> Jeff
> www.afprkit.com
> ----- Original Message -----
> From: <berniek at technicaldevelop.com>
> To: <Supras at supras.com>
> Sent: Thursday, May 17, 2007 9:15 PM
> Subject: [Supras] 550 CC fuel injectors
>
>
> >I know this subject has been discussed numerous times before, and I've
> >received replies from many good, knowledgeable contributors.  But before
> >committing to buying 550 CC injectors, one last set of responses would be
> >appreciated.
> >
> > New Jersey still uses dynamometers for emissions measurement of
pre-OBDII
> > cars at 15 MPH, as I found out today when I took my 20 year old 300 CID
> > Chevy van for inspection.  The HC limit of 174 PPM seems very hard to
meet
> > in some instances.  When I had the Supra running with the stock engine,
it
> > was super smooth with no hint of a misfire, but the HC reading was
around
> > 90 PPM.  Amazingly the Chevy V8 was only 9 PPM with about 10 degrees of
> > spark retard.  Conversely a 3 liter SOHC older Nissan is right up at the
> > limit with fresh spark plugs and about the same spark retard.  CO and
NOX
> > have never been problematic.
> >
> > I contacted Importblowoutsales, who replied that they know nothing about
> > emissions characteristics of Lucas injectors.  Others in the group had
> > reported good results in that regard from RC (disc type) injectors.  Yet
> > others have advised against use of Venom injectors, as quality control
> > seems poor.  Arlene uses Greddy injectors, but there is no emissions
> > inspection in Oklahoma.
> >
> > One point of concern is the fact that the stock injectors have the
punched
> > sheet metal cover over the pintle end for some good reason, or Toyota
> > would not have provided it.  Venom provides them since they are
apparently
> > modified stock injectors.  It would appear that the intake port divider
to
> > each valve is the reason from splitting the stock injector pattern in
> > half.  "Straight" injectors will spray much of the fuel onto the
divider.
> >
> > Hence the concern about 550 CC injectors.  Any and all comments would be
> > appreciated.  Thanks.
> >
> >
> >        BernieK
> > _______________________________________________
> > Supras mailing list
> > Supras at supras.com
> > http://supras.com/mailman/listinfo/supras_supras.com
> >
> >
> > --
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> > Checked by AVG Free Edition.
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> > 5:18 PM
> >
> >
>
>
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>
>
>
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18:05
>
>
----- Original Message -----
From: <berniek at technicaldevelop.com>
To: <Supras at supras.com>
Sent: Friday, May 18, 2007 3:15 AM
Subject: [Supras] 550 CC fuel injectors

> I know this subject has been discussed numerous times before, and I've
received replies from many good, knowledgeable contributors.  But before
committing to buying 550 CC injectors, one last set of responses would be
appreciated.
>
> New Jersey still uses dynamometers for emissions measurement of pre-OBDII
cars at 15 MPH, as I found out today when I took my 20 year old 300 CID
Chevy van for inspection.  The HC limit of 174 PPM seems very hard to meet
in some instances.  When I had the Supra running with the stock engine, it
was super smooth with no hint of a misfire, but the HC reading was around 90
PPM.  Amazingly the Chevy V8 was only 9 PPM with about 10 degrees of spark
retard.  Conversely a 3 liter SOHC older Nissan is right up at the limit
with fresh spark plugs and about the same spark retard.  CO and NOX have
never been problematic.
>
> I contacted Importblowoutsales, who replied that they know nothing about
emissions characteristics of Lucas injectors.  Others in the group had
reported good results in that regard from RC (disc type) injectors.  Yet
others have advised against use of Venom injectors, as quality control seems
poor.  Arlene uses Greddy injectors, but there is no emissions inspection in
Oklahoma.
>
> One point of concern is the fact that the stock injectors have the punched
sheet metal cover over the pintle end for some good reason, or Toyota would
not have provided it.  Venom provides them since they are apparently
modified stock injectors.  It would appear that the intake port divider to
each valve is the reason from splitting the stock injector pattern in half.
"Straight" injectors will spray much of the fuel onto the divider.
>
> Hence the concern about 550 CC injectors.  Any and all comments would be
appreciated.  Thanks.
>
>
>         BernieK
> _______________________________________________
> Supras mailing list
> Supras at supras.com
> http://supras.com/mailman/listinfo/supras_supras.com
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.467 / Virus Database: 269.7.1/807 - Release Date: 16/05/2007
18:05
>