[Syty] Passed emissions test, but why?

[Jim Sloan]

Detailed information on closed loop and cold operation can be found at
http://sunflower.com/~leroy/P4/section9.htm , if you are interested.  It
should be in closed loop and out of cold operation at 160.
 
I don't think it really explains why some pass and some fail emissions with
a 160 thermostat, though.  I have a theory to toss out there.  Toss it back
if you don't like it.  The thermostat sets the minimum cooling system
temperature.  Maximum cooling temperature is determined more by the
radiator, and overall condition of the cooling system.  For example, I have
a 160 thermostat, but often see temperatures close to 180 (and I think my
cooling system is in pretty good shape).
 
Another factor to consider is the intercooler pump.  It's not set to come on
until around 180, and it's operation would affect the MAT.  A failing  IC
pump may help emissions.
 
Jim


  _____  

From: syty-bounces at syty.org [mailto:syty-bounces at syty.org] On Behalf Of
DOlivares
Sent: Wednesday, January 18, 2006 9:24 PM
To: RadarBlueTyphoon at aol.com
Cc: syty at syty.org
Subject: Re: [Syty] Passed emissions test, but why?
Importance: Low


It's obviously 'cause, as I plainly said, the ECM algorithms of the SyTys
apparently don't correlate IAT & CTS inputs in such a way as to prevent the
System from going into closed-loop operation... probably after a fixed
amount of TIME or other variable.  I "explain" it by the absence of
commentary or notices to the contrary.
 
And even though you may have passed emissions-- possibly with a "gentlemen's
C"-- with that colder-than-stock unit, I think you might well have ace'd the
test with a hotter 'stat!
 
Never having HAD to worry about emissions blues with either my 'Phoon or my
'Clone (which also came with a 160° t-stat but which I changed to a 180°
right away as part of the underdrive-pulley installation... to facilitate
drivability, increase the lousy mileage, and keep my tootsies warm in that
Northern climate), I just never got into the finagling I did with the TTA.
Then I leapfrogged to the 10-in-1 a year later and left my
SyTy-chip-reprogramming activities on the Bench for a rainy day....
 
Okay? 
  _____  

 
----- Original Message ----- 
From: RadarBlueTyphoon at aol.com 
To: seravilo at netzero.net 
Sent: Wednesday, January 18, 2006 8:04 PM
Subject: Re: [Syty] Passed emissions test, but why?


Well Dennis maybe you can explain this one for him. The Ty  you purchased
from me has run an 160 thermostat since I purchased it and it never failed
an emission test her in St. Louis.
 
Tim

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