Matt
Spears
EPA­
OAR,
OTAQ,
ASD
Transmission
Date:
01/
11/
2005
10:
55:
00
AM
To:
donald.
nagy@
gm.
com
cc:
Alan
Stout/
AA/
USEPA/
US@
EPA,
Michael
Sabourin/
AA/
USEPA/
US@
EPA,
"
Vaillancourt,
Michael
(
M.
T.)"
<
mvaillan@
ford.
com>,
ram12@
daimlerchrysler.
com,
shirish.
a.
shimpi@
Cummins.
com
Subject:
Re:
Additional
Comments
on
Part
1065
NOx
Humidity
Correction
Factor­­
Thank
you
&
request
for
additional
information
on
datapoints
Hi
Don:

Thank
you
for
the
letter
and
the
comprehensive
chart.
That
helps
us
understand
your
comments
much
better.

We
are
currently
reviewing
two
other
similar
submissions
of
comments,
but
some
of
the
other
comments
have
specific
NOx­
humidity
sensitivity
information
based
on
specific
emissions
control
technology,
including
some
nonroad
SI
information.
In
order
to
put
your
comments
in
context
with
the
other
information
we've
received,
would
you
elaborate
on
the
origin
of
the
Ford
and
GM
datapoints
by
addressing
the
following
questions?
If
any
of
the
information
is
not
available,
just
indicate
N/
A.
However,
the
more
information
you
can
provide
the
better
we
will
be
able
to
evaluate
your
comments
with
respect
to
the
other
information.

1.
What
test
cycle(
s)
were
used?
If
these
were
steady­
state
points,
what
was
the
speed(
s)
and
road
load(
s)?
2.
What
were
the
model(
s)
and
model
year(
s)
of
the
vehicles?
3.
What
year(
s)
was
the
data
collected?
4.
What
fuel(
s)
were
used?
5.
For
each
vehicle,
what
was
the
most
stringent
emissions
standard
that
the
vehicle
met?
6.
For
each
vehicle,
briefly
identify
the
technology
for
the
following:
a.
Fuel
injection?
(
e.
g.
carb.,
TBI,
PFI,
etc.)
b.
F/
A
ratio
control?
(
e.
g.
carb.,
open
loop
MAF,
MAP
&
speed,
closed
loop
single
O2,
dual
O2,
target
F/
A
or
lamda­­
stoich
(,
etc.)
c.
Aftertreatment?
(
e.
g.
none,
3­
way
catalyst,
light­
off
cat.,
electrically
heated,
HC
adsorber,
etc.)
d.
Knock
control?
(
e.
g.
,
none,
sensor
type,
analog
filtered
signal
or
DSP,
individual
cylinder
or
bank
control,
etc.)
e.
EGR?
(
e.
g.
yes,
no)
f.
OBD?
(
e.
g.
none,
OBDII,
etc.)

Thanks
again
for
the
good
information,

Matt
Spears
US
EPA
734­
214­
4921
