[Supras] emission test standards

Wed Sep 12 08:56:31 CDT 2007

I don't recall the Georgia requirements but I do recall that the RT high flow 3" converter performed better during the test than the two OEM cat's that were in place when I bought the car. The exhaust was 3" from the second stock cat when I bought it and barely passed emissions the first year. I replaced the downpipe and the second cat the second year and acheived improved performance as well as test results.

----- Original Message ----
From: "berniek at technicaldevelop.com" <berniek at technicaldevelop.com>
To: Rockey Fox <supr91tt at yahoo.com>
Cc: wwt3198 at yahoo.com; Supras at supras.com
Sent: Tuesday, September 11, 2007 9:32:44 PM
Subject: Re: emission test standards

Rocky:

    The NJ standards are as follows for cars of '91 vintage:

NOx:  1077 PPM
HC:    144   PPM
CO:    0.81%

    Do you happen to know your standards? 

    Before I tore down my '91 to replace the HG as a preventative 
measure, my results with the stock dual cat system were 103 for HC, 0.27 
for CO, and 1063 for NOx.   The EGR might not have been working 
properly.  But as matters would have it, I found that #1 piston did not 
come up to the deck (down about .110"), so a bent connecting rod was 
evident.  So I have about another 20 hours worth of work to complete a 
freshened JDM installation with a Cometic HG, 550 injectors, Lex AFM, 57 
trim turbo, and as yet undetermined means of leaning out the top end 
under boost and possibly retarding the spark about 7 degrees from 7 to 
15 PSI boost. 

    The truth is I'm getting a little nervous about passing CO and HC 
with the 550 and Lex even with the stock dual cats.  The duty cycle of 
the injectors will be about 20% shorter at idle.  If the injectors are a 
little unbalanced, HC goes up dramatically with even the slightest 
misfire, and CO goes up with one richer cylinder. 

       Bernie

Rockey Fox wrote:
> I don't know if NJ is tighter on emissions than GA but my 3" downpipe 
> with a single 3" cat from Random technologies passed GA emissions 
> without issue prior to the engine rebuild a couple of years back. I 
> live one county beyond the emissions required zone of metro-Atlanta 
> now so no recent information. Basically stock setup with FIPK, 440's 
> and at that time stock ct-26 with the 3" turbo back exhaust.
>
> Rockey 91T
>
> ----- Original Message ----
> From: "berniek at technicaldevelop.com" <berniek at technicaldevelop.com>
> To: wwt3198 at yahoo.com
> Cc: Supras at supras.com
> Sent: Tuesday, September 11, 2007 9:27:36 AM
> Subject: [Supras] (no subject)
>
> Wade:
>
> Yes, I did read your last mail, and will strongly consider a bigger
> turbo-back system, but NJ is a pain in the butt with exhaust emissions.  I
> wonder if a large downpipe and large single cat would do the job.  Anyone
> know?
>
> Thanks for the info on the MSD retarder.  I'll look into it.  But from
> what you say, it seems essentially unnecessary.  Does the ECU "learn" a
> new retard curve?  Different gas qualities found around the world would
> seem to indicate this.
>
> What type of Piggyback is most popular for taking out top end richness in
> the Lex-550 setup?  Any ideas for the most popular downpipe and big cat?
> I already have an 80 mm cat-back HKS systemI also have a 57 trim turbo.
>
> Any and all help and thoughts would be appreciated.  Thanks.
>
>      BernieK
>
> Wade Tobin Wrote:
> -------------------
> Message: 7
> Date: Tue, 11 Sep 2007 01:59:50 -0700 (PDT)
> From: Wade Tobin <wwt3198 at yahoo.com>
> Subject: Re: [Supras] Spark retard and top end fuel redux
> To: supras at supras.com
> Message-ID: <908299.23720.qm at web52502.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> That's some interesting reading but perhaps you're going into this a bit
> deeper than
> necessary.:)  There's dozens and dozens of 7m's running around w/ Lexus
> AFMs, 550s,
> piggybacks and no problems.  Been using a Lexus AFM/550s since 02 on the
> same engine
> which came from a junkyard (140k miles).  The car has made 420rwhp on the
> dyno 50
> passes on the track both 1/8 mile and 1/4 mile.  About 20 of those passes
> were over
> 17psi.  Best time was a 12.4 @ 117.
>
>   Don't know if you got my last email Bernie, but running the stock CT26
> elbow, DP
> and both cats is an area I'd far more concerned with than Lexus AFM tech.
> Surely,
> a choked up exhaust will cause higher EGTs and detonation, Lexus AFM 
> or not.
> Also, a big intercooler is also a good idea.  The stock MK3 exhaust and
> intercooler = garbage.
>
>   Your absolutely correct about the ECU not retarding the timing w/ the
> Lexus.  MSD
> sells a boost timing retarder box for your needs.  I don't run one.
>
>   -wt
>
>
>
> _______________________________________________
> Supras mailing list
> Supras at supras.com
> http://supras.com/mailman/listinfo/supras_supras.com
>
>
> ------------------------------------------------------------------------
> Building a website is a piece of cake.
> Yahoo! Small Business gives you all the tools to get online. 
> <http://us.rd.yahoo.com/evt=48251/*http://smallbusiness.yahoo.com/webhosting/?p=PASSPORTPLUS>

____________________________________________________________________________________
Got a little couch potato? 
Check out fun summer activities for kids.
http://search.yahoo.com/search?fr=oni_on_mail&p=summer+activities+for+kids&cs=bz 