[Supras] 550 CC fuel injectors

[Jeff Corbat]

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
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