<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <wontGrowAutofit/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <style> st1\:*{behavior:url(#ieooui) } </style> <![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style> <![endif]--> For the actuator question, no. GM did not build any provisions like this. However, under extreme situations, torque management will come into play. It will limit torque, but this is all in calibration, not any actuator.

For the cool down question, if towing in extreme heat, like the last week in the USA, over 85-100 degrees, it will have increased temps on the transmission and the engine. If the service engine soon light is on, take to a GM Dealer to have the code checked and cooling system evaluated.

For the last question of increasing horsepower, there is no GM approved provisions to increase horsepower.

Louis
GM Customer Service

 

It is not that it is slowly opening the throttle, althought that is exactly how it feels. Torque Mangement (TM) is retarding the timing, quite a bit. Then as you accellerate, the timing gradually returns to normal, then approaching redline the timing retards again.

If you get a custom tune you can dial back the TM in percentages or totally disable it. I'm going to do a Blackbear tune. I emailed them and just explained that I hate TM, don't want to grenade my trans, don't want harsh shifts when driving normally with the family or towing but firm shifts while driving agressively are fine. Justin already replied that he can do this for my ride. I am just waiting to resolve one last issue before I place my order. My K&N FIPK is messing with my MAF and throwing P0171 too lean bank 1 and P0101 MAF circuit range / performance problem. But no issues with the stock airbox arrangement and with the K&N, only when towing.

Search for more on "torque management" and "abuse mode"

 

Being in reverse, is going to prevent the extra cooling of the trans cooler from working as effectively... granted the fan will still pull air across the unit, its not getting the same cooling as air being pushed across it as well...

That might be something to check also, make sure the fans are coming on as they should....

 

torque management in reguards to the tcase involves transfering power from the rear driveaxle to the front. The tcase will do this when in 4auto and rear wheel slip is detected.

The nqh tcase that you have; there is an actuator on the tcase that is pulse width modulated to apply a clutch that governs the amount of torque sent to the front drive axles.

 

I thought "Torque Management" was specifically the retarded timing I described above. If the tcase is doing something different, I would think there is a different name for that. Maybe this gets into the Stabilitrak, Autoride and other electronic traction control and stability system "enhancements."

AUTORIDE:

TROY, Mich., Aug. 25 /PRNewswire/ -- Consumers in the market for a new SUV
from General Motors will experience superior ride quality and handling
performance when they purchase a 2005 Tahoe, Suburban, Yukon or Yukon XL
equipped with the Safe & Secure package (RPO - PDY). This package includes
StabiliTrak, four side-impact air bags and Delphi Corp.'s (NYSE: DPH) Autoride
ride control system.

Autoride Benefits
Autoride is a fully automatic ride control system that continually adjusts
the damping level on each of the four individual shock absorbers to provide
superior ride quality and handling performance. Autoride's "tow/haul" mode
helps improve vehicle body control while towing and hauling by offering
increased levels of damping. Also included with Autoride is automatic rear
level control, an air suspension system that helps keep the vehicle level over
a wide range of passenger and loading conditions while also maintaining rear
ride travel.

Autoride Operation
Autoride uses an electronic control module (ECM) to continuously monitor
brake, throttle and steering inputs as well as vehicle body and wheel motions.

Using this data, the ECM can maintain optimum ride quality by separately and
electronically adjusting the hydraulic fluid flow through the valuing discs in
the shock absorbers. This results in enhanced body control motion and a
pleasing, refined and well-isolated ride.
"The global controlled suspension market is estimated to grow 10 percent
over the next six years, but Delphi estimates nearly a 15 percent CAGR
(Compounded Annual Growth Rate) during that timeframe," said Guy C. Hachey,
president, Delphi Energy & Chassis. "Delphi has become a dominant player in
the controlled suspension market and we look forward to future growth with
innovations such as Autoride, MagneRide(TM) (controlled damping) and Active
Stabilizer Bar System (roll control)."
Delphi's Autoride comes standard on the GMC Yukon Denali and Yukon XL
Denali. The product is also standard on the Cadillac Escalade, Escalade EXT
and Escalade ESV where it is known as Road Sensing Suspension.
For more information about Delphi, visit Delphi Media Room .

SOURCE Delphi Corporation

Stabilitrak:

(from a site about cars but it has more info than "Stabilitrak is your nany" info on GMs website)

We appreciate the help of Stabilitrak, which mostly eliminated the squealing tires that can bring the attention of the law, while keeping the rear end of cars with powerful engines where they should be - in the rear. Indeed, the difference between Camaros with and without Stabilitrak was fairly extreme, with the electronic application of traction control and suspension travel making the difference between a composed, predictable, incredibly fast car and one which seemed to always want to make sudden, unexpected U-turns when the gas was stomped.
GM writes: "StabiliTrak 2.0, an improved version of the most advanced integrated stability control system in the world... includes side-slip rate control and active steering effort compensation. Introduced on three performance-oriented Cadillac models in the 1997 model year, StabiliTrak provides an important safety advance by helping the driver maintain control during emergency or evasive maneuvers. StabiliTrak works by comparing the driver’s intentions (indicated by steering wheel position) with how the vehicle is responding. Three key sensors keep the ABS and traction control computer informed: one reads steering wheel angle, another reports the vehicle’s lateral acceleration and the third measures yaw rate (rotational velocity about a vertical axis through the car’s center of gravity). Information is also gathered from vehicle speed.
"If the vehicle’s dynamic response does not agree with the direction the driver is steering, StabiliTrak goes to work by selectively applying the individual front brakes to help keep the car on the intended course. If the car is slipping wide of the desired path in a turn, applying the inside brake helps the vehicle turn tighter. In case of diminished traction at the rear causing the tail of the car to drift wide, activating the outside-front brake gently nudges the car back in line. StabiliTrak is automatic and requires no additional driver action. In most cases, the driver probably won’t even notice the helping hand from this technically sophisticated system....Unlike stability control systems from other manufacturers, Cadillac’s system maintains the driver’s ability to apply throttle in StabiliTrak maneuvers."
We generally found Stabilitrak to be, well, an incredibly useful system, in dry, wet, or snowy conditions.

 

Interesting, didn't know that. Seems like the retarded timing would raise hell w/ the emissions tho.

Let us know how your tune works for you. What happens to the tune if the dealer does an ECM software update? Does Justen put the tune in again?