Lean Cruise mode

[rattle]

So you say you cant give us the option to turn lean cruise mode on because the EPA says so? Have heard it said that lean cruise mode is not legal in north america unless the manufacturer claimed it when they submit their CAFE ratings.

Well if lean cruise is not legal then how the @#$# can allowing open loop operation be legal?

So come on, whats the real reason for not putting lean cruise enable into the editor? Just a matter of a bit or two to bypass the platform id check aint it?

[mediumrareintexas]

Interesting Rattle. Where did you find information on Lean Cruise Mode?

[rattle]

(14) ``Lean-on-cruise'' calibration strategies. (i) For Tier 2 and
interim non-Tier 2 vehicles, the manufacturer must state in the
Application for Certification whether any ``lean-on-cruise'' strategies
are incorporated into the vehicle design. A ``lean-on-cruise'' air-fuel
calibration strategy is defined as the use of an air-fuel ratio
significantly greater than stoichiometry, during non-deceleration
conditions at speeds above 40 mph. ``Lean-on-cruise'' air-fuel
calibration strategies must not be employed during vehicle operation in
normal driving conditions, including A/C usage, unless at least one of
the following conditions is met:
(A) Such strategies are substantially employed during the FTP or
SFTP;
(B) Such strategies are demonstrated not to significantly reduce
vehicle NMHC+NOX emission control effectiveness over the
operating conditions in which they are employed; or
(C) Such strategies are demonstrated to be necessary to protect the
vehicle occupants, engine, or emission control hardware.
(ii) If the manufacturer proposes to use a ``lean-on-cruise''
calibration strategy, the manufacturer must specify the circumstances
under which such a calibration would be used, and the reason or reasons
for the proposed use of such a calibration.
* * * * *
(o) Unless otherwise approved by the Administrator, manufacturers
must measure NMOG emissions in accordance with the California Non-
Methane Organic Gas Test Procedures. These procedures are incorporated
by reference (see Sec. 86.1).
(p) For gasoline and diesel-fueled Tier 2 and interim non-Tier 2
vehicles, manufacturers may measure non-methane hydrocarbons (NMHC) in
lieu of NMOG. Manufacturers must multiply NMHC measurements from
gasoline vehicles by an adjustment factor of 1.04 before comparing with
the NMOG standard to determine compliance with that standard.
Manufacturers may use other factors to adjust NMHC results to more
properly represent NMOG results. Such factors must be based upon
comparative testing of NMOG and NMHC emissions and be approved in
advance by the Administrator.

http://www.epa.gov/fedrgstr/EPA-AIR/...ay-10/a19d.htm

[mediumrareintexas]

Thanks. Kind of make you wonder what else is being kept from us.

;D

[BQuicksilver]

I'll have to say I agree with rattle as well. Put a warning on the box like with the DTC disables for rear O2's, and let us be the ones to choose what we do.

Let us turn on/off what we want, change tire size to what we want, etc. Let it be our choice.

[MrDude_1]

(14) ``Lean-on-cruise'' calibration strategies. (i) For Tier 2 and
interim non-Tier 2 vehicles, the manufacturer must state in the
Application for Certification whether any ``lean-on-cruise'' strategies
are incorporated into the vehicle design. A ``lean-on-cruise'' air-fuel
calibration strategy is defined as the use of an air-fuel ratio
significantly greater than stoichiometry, during non-deceleration
conditions at speeds above 40 mph. ``Lean-on-cruise'' air-fuel
calibration strategies must not be employed during vehicle operation in
normal driving conditions, including A/C usage, unless at least one of
the following conditions is met:
(A) Such strategies are substantially employed during the FTP or
SFTP;
(B) Such strategies are demonstrated not to significantly reduce
vehicle NMHC+NOX emission control effectiveness over the
operating conditions in which they are employed; or
(C) Such strategies are demonstrated to be necessary to protect the
vehicle occupants, engine, or emission control hardware.
(ii) If the manufacturer proposes to use a ``lean-on-cruise''
calibration strategy, the manufacturer must specify the circumstances
under which such a calibration would be used, and the reason or reasons
for the proposed use of such a calibration.
* * * * *
(o) Unless otherwise approved by the Administrator, manufacturers
must measure NMOG emissions in accordance with the California Non-
Methane Organic Gas Test Procedures. These procedures are incorporated
by reference (see Sec. 86.1).
(p) For gasoline and diesel-fueled Tier 2 and interim non-Tier 2
vehicles, manufacturers may measure non-methane hydrocarbons (NMHC) in
lieu of NMOG. Manufacturers must multiply NMHC measurements from
gasoline vehicles by an adjustment factor of 1.04 before comparing with
the NMOG standard to determine compliance with that standard.
Manufacturers may use other factors to adjust NMHC results to more
properly represent NMOG results. Such factors must be based upon
comparative testing of NMOG and NMHC emissions and be approved in
advance by the Administrator.

http://www.epa.gov/fedrgstr/EPA-AIR/...ay-10/a19d.htm

so in a nutshell:

"we're the EPA, and we dont want your lean on cruise mode screwing with our 'important' test readings of MPG and emissions, therefore you have to tell us about it or not do it."

right?

[jimmyblue]

I wonder whether with the OS access of the Pro version
(supposedly now part of all the new updates?) this can
be fixed to enable the lean cruise by the user (with sufficient
info)?

[Magic_Chicken]

I haven't found anywhere to modify the OS yet. The only OS functions is the 1,2,3 bar licensing.

[marc_w]

I tried running LC on my 04 truck with parameters used in some Aussie car which model escapes me right now.

It seems as though a few 03 Silverado SS's are noticing gains in mileage. I noticed/scanned no changes at all.

[Arron]

After reading a post on an australian site it seems that we longer have lean cruse mode in australia now (i could be wrong though).I have been told that newer cars are coming with the lean cruse mode disabled , but only need to put in the corect numbers to enable it .

[JimMueller]

The competition claims they hope to have a fix for their U.S. implementation by the end of February. At least they claim to be working on it. What happened to listening to the customers?

[Magic_Chicken]

The competition claims they hope to have a fix for their U.S. implementation by the end of February. At least they claim to be working on it. What happened to listening to the customers?

Listening to customers is fine unless they want you to break the law, which enabling lean cruise in America would be.

[Rob]

Listening to customers is fine unless they want you to break the law, which enabling lean cruise in America would be.

I just don't get the double standard though. Its OK to take off the EGR, air pump, cats, etc and disable the code but its not OK to enable lean cruise?

[Magic_Chicken]

I don't make the rules

[Chris@HPTuners]

I just don't get the double standard though. Its OK to take off the EGR, air pump, cats, etc and disable the code but its not OK to enable lean cruise?

It's not a double standard. All those mods you list are quite ok to make a car run at the track.

[AnotherUser]

Stupid question...can this option be edited on the Aussie VCMs?

[rattle]

well then, this thread has really gone nowhere.

so it is illegal to have lean cruise enable in the software, fair enough!

why not just post a dissasembly of the section of code that requires attention and let the end user modify the code at their own choosing.

[AnotherUser]

well then, this thread has really gone nowhere.

so it is illegal to have lean cruise enable in the software, fair enough!

why not just post a dissasembly of the section of code that requires attention and let the end user modify the code at their own choosing.

Man, making that in a way that anyone could understand it would take linger than programming VCM Suite 2.0 from scratch. Anyways, why reinvent the wheel? Can't somebody just use an Aussie VCM over top of their VCM if they absolutely had to do it?

[PBarnard]

The competition claims they hope to have a fix for their U.S. implementation by the end of February. At least they claim to be working on it. What happened to listening to the customers?

And they also hinted it was going to a free upgrade for their customers ? with a new operating system

[Magic_Chicken]

And they also hinted it was going to a free upgrade for their customers ? with a new operating system

And then for anyone that upgraded, they were going to send them free tshirts and stickers and give them a refund for the cost of their product. I even saw a hint that they soon might start paying you to use their product too! :