I am curious, my 08 coupe had an ECM software update, is this the same as the current 09"s? I did not feel any difference in power, but I was wondering if it changed the fuel management?

 

The knock sensor parameters have been modified for the '09.

 

The '09 has all the same tables BUT some of them have been expanded on (more rows in most cases for some of the tables). Fuel management was one of them along with the knock sensors. Also a lot of differences in the Trans. tables (most of the resizing of tables was there). It does not add any horsepower at all, mostly just fixes to issues they encountered from the '08, especially with the knock sensor sensitivity.

Can't really tell you how much the '08 update matches up with the '09 though. If you can post an HP tune file of your car I would love to see how similar they are if at all.

 

Thanks for the response, but I do not have an HP tune file of my car. Maybe someone out there does and we can compare?

 

I'd be curious to know also. However, I'd be willing to bet they are not the same (basing this solely on the fact of how different the '09 VCM's are compared to the '08s.)

 

How did you get the update Mike?

 

GM updated the ECM while it was in for some warranty service.

 

I have a copy of both HP Tuner tunes for 08 and 09. There are 208 differences. Here's the list:

Main File : stk08vette.hpt
Compare File: stk09vette.hpt

Main File Parameters : 1018
Compare File Parameters: 987

Parameters Compared: 879
Differences : 208
Similarities: 671

Engine
Idle
Idle Airflow
General
Idle ETC Area Scalar 4725.0000 : 5636.0000
Fuel Control
General Fuel
Injector Control
Injector Offset vs. Pressure Delta vs. IGNV 553 of 561 cells
Injector Flow Rate vs. Pressure Delta 33 of 33 cells
Fuel Cutoff, DFCO
Deceleration Fuel Cutoff
DFCO Enable RPM 1200 : 1300 rpm
DFCO Entry Spark 12 of 17 cells
DFCO Exit Spark 12 of 17 cells
COT, Lean Cruise
Displacement On Demand
DoD Disable Vacuum 297 of 297 cells
Spark Control
Spark Advance
Spark Correction
IAT Spark Advance Correction - Add 27 of 1089 cells
Spark Retard
Knock Learn
Knock Learn Min MAP 50 : 25 kPa
Knock Learn Min RPM 400 : 1120 rpm
Knock Learn Up Thresh 2.00 : 1.50 °
Knock Learn Up 8 of 9 cells
Knock Retard Attack
Knock Retard Valid Max 12.0 : 2.0 °
Knock Retard Disable Time 0 : 4
Knock Sensors
Knock Sensor Level
Knock Sensor Threshold Mult Cyl1 25 of 153 cells
Knock Sensor Threshold Mult Cyl2 25 of 153 cells
Knock Sensor Threshold Mult Cyl3 25 of 153 cells
Knock Sensor Threshold Mult Cyl4 25 of 153 cells
Knock Sensor Threshold Mult Cyl5 25 of 153 cells
Knock Sensor Threshold Mult Cyl6 25 of 153 cells
Knock Sensor Threshold Mult Cyl7 25 of 153 cells
Knock Sensor Threshold Mult Cyl8 25 of 153 cells

Engine Diagnostics
General
Diagnostic Tests
Maximum Airflow Delta vs. TPS 6 of 9 cells
Maximum MAP Delta vs. TPS 6 of 9 cells
Misfire
Cylinder Mode
Misfire Cylinder Mode Event Time - Normal 13 of 442 cells
Misfire Cylinder Mode Event Time - Normal 2nd Order 55 of 442 cells
SCD Mode
Misfire SCD Mode Event Time - Off Idle 20 of 221 cells
Misfire SCD Mode Event Time - Off Idle 2nd Order 36 of 221 cells

Transmission
Auto Shift Speed
Part Throttle Shift
Shift Speed vs. TPS vs. Shift - Normal 28 of 102 cells
Shift Speed vs. %TPS vs. Shift - Pattern B 28 of 102 cells
Auto Shift Properties
Desired Shift Time
Base Shift Time 1-2 0.2754 : 0.0000 sec
Base Shift Time 2-3 0.3496 : 0.0000 sec
Base Shift Time 3-4 0.3496 : 0.0000 sec
Base Shift Time 4-5 0.2998 : 0.0000 sec
Base Shift Time 5-6 0.2998 : 0.0000 sec
Base Shift Time 1-2 Special 0.2197 : 0.0000 sec
Base Shift Time 2-3 Special 0.3496 : 0.0000 sec
Base Shift Time 3-4 Special 0.2754 : 0.0000 sec
Base Shift Time 4-5 Special 0.2998 : 0.0000 sec
Base Shift Time 5-6 Special 0.2998 : 0.0000 sec
Base Shift Time PD 4-3 0.2500 : 0.2998 sec
Base Shift Time CT 3-2 0.3496 : 0.5996 sec
Base Shift Time CT 4-3 0.2500 : 0.5000 sec
Base Shift Time CT 5-4 0.2998 : 0.4502 sec
Inertia Factor Profile
Shift Inertia Factor Profile 1-2 67 of 81 cells
Shift Inertia Factor Profile 2-3 62 of 81 cells
Shift Inertia Factor Profile 3-4 59 of 81 cells
Shift Inertia Factor Profile 4-5 58 of 81 cells
Shift Inertia Factor Profile 5-6 58 of 81 cells
Shift Inertia Factor Profile 1-3 60 of 81 cells
Shift Inertia Factor Profile 1-4 56 of 81 cells
Shift Inertia Factor Profile 2-4 56 of 81 cells
Shift Inertia Factor Profile 2-6 56 of 81 cells
Shift Inertia Factor Profile 3-5 56 of 81 cells
Shift Inertia Factor Profile Default 56 of 81 cells
Shift Inertia Factor Profile PD 6-5 70 of 81 cells
Shift Inertia Factor Profile PD 5-4 53 of 81 cells
Shift Inertia Factor Profile PD 4-3 48 of 81 cells
Shift Inertia Factor Profile PD 3-2 37 of 81 cells
Shift Inertia Factor Profile PD 2-1 73 of 81 cells
Shift Inertia Factor Profile PD 6-4 74 of 81 cells
Shift Inertia Factor Profile PD 6-2 70 of 81 cells
Shift Inertia Factor Profile PD 5-3 69 of 81 cells
Shift Inertia Factor Profile PD 4-2 60 of 81 cells
Shift Inertia Factor Profile PD 4-1 74 of 81 cells
Shift Inertia Factor Profile PD 3-1 73 of 81 cells
Shift Time Inertia Adder
Shift Time Inertia Adder 1-2 9 of 9 cells
Shift Time Inertia Adder 2-3 7 of 9 cells
Shift Time Inertia Adder 1-2 Special 8 of 9 cells
Shift Time Inertia Adder 2-3 Special 6 of 9 cells
Shift Time Torque Adder
Shift Time Input Torque Adder 1-2 78 of 81 cells
Shift Time Input Torque Adder 2-3 81 of 81 cells
Shift Time Input Torque Adder 3-4 81 of 81 cells
Shift Time Input Torque Adder 4-5 81 of 81 cells
Shift Time Input Torque Adder 5-6 81 of 81 cells
Shift Time Input Torque Adder 1-2 Special 72 of 81 cells
Shift Time Input Torque Adder 2-3 Special 78 of 81 cells
Shift Time Input Torque Adder 3-4 Special 81 of 81 cells
Shift Time Input Torque Adder 4-5 Special 81 of 81 cells
Shift Time Input Torque Adder 5-6 Special 81 of 81 cells
Shift Time Input Torque Adder PD 6-5 81 of 81 cells
Shift Time Input Torque Adder PD 5-4 79 of 81 cells
Shift Time Input Torque Adder PD 4-3 81 of 81 cells
Shift Time Input Torque Adder PD 3-2 80 of 81 cells
Shift Time Input Torque Adder PD 2-1 81 of 81 cells
Shift Time Input Torque Adder PD 6-4 81 of 81 cells
Shift Time Input Torque Adder PD 6-2 81 of 81 cells
Shift Time Input Torque Adder PD 5-3 80 of 81 cells
Shift Time Input Torque Adder PD 4-2 81 of 81 cells
Shift Time Input Torque Adder PD 4-1 81 of 81 cells
Shift Time Input Torque Adder PD 3-1 80 of 81 cells
Shift Time Input Torque Adder PD 6-5 Special 20 of 81 cells
Shift Time Input Torque Adder PD 4-3 Special 59 of 81 cells
Shift Time Input Torque Adder PD 2-1 Special 56 of 81 cells
Shift Time Transition
Shift Time Initial Transition Time % 1-2 8 of 9 cells
Shift Time Initial Transition Time % 2-3 9 of 9 cells
Shift Time Initial Transition Time % 3-4 4 of 9 cells
Shift Time Initial Transition Time % 4-5 1 of 9 cells
Shift Time Initial Transition Time % 5-6 1 of 9 cells
Shift Time Initial Transition Time % 1-2 Special 8 of 9 cells
Shift Time Initial Transition Time % 2-3 Special 4 of 9 cells
Shift Time Initial Transition Time % 3-4 Special 3 of 9 cells
Shift Time Initial Transition Time % 4-5 Special 1 of 9 cells
Shift Time Initial Transition Time % 5-6 Special 1 of 9 cells
Shift Time Final Transition Time % 1-2 4 of 9 cells
Shift Time Final Transition Time % 2-3 1 of 9 cells
Shift Time Final Transition Time % 3-4 9 of 9 cells
Shift Time Final Transition Time % 4-5 1 of 9 cells
Shift Time Final Transition Time % 5-6 1 of 9 cells
Shift Time Final Transition Time % 1-2 Special 8 of 9 cells
Shift Time Final Transition Time % 2-3 Special 5 of 9 cells
Shift Time Final Transition Time % 3-4 Special 9 of 9 cells
Shift Time Final Transition Time % 4-5 Special 1 of 9 cells
Shift Time Final Transition Time % 5-6 Special 1 of 9 cells
Desired Output Torque Factor
Shift Desired Output Torque Scale Factor 1-2 52 of 81 cells
Shift Desired Output Torque Scale Factor Mult 1-2 18 of 81 cells
Shift Desired Output Torque Scale Factor 2-3 62 of 81 cells
Shift Desired Output Torque Scale Factor 3-4 32 of 81 cells
Shift Desired Output Torque Scale Factor 4-5 20 of 81 cells
Shift Desired Output Torque Scale Factor 1-2 Special 57 of 81 cells
Shift Desired Output Torque Scale Factor Mult 1-2 Special 15 of 81 cells
Shift Desired Output Torque Scale Factor 2-3 Special 67 of 81 cells
Shift Desired Output Torque Scale Factor 3-4 Special 53 of 81 cells
Base Shift Pressure
Base Shift Pressure 1-2 Pattern X 19 of 25 cells
Base Shift Pressure 2-3 Pattern X 21 of 25 cells
Base Shift Pressure 3-4 Pattern X 20 of 25 cells
Base Shift Pressure 4-5 Pattern X 16 of 25 cells
Base Shift Pressure 5-6 Pattern X 24 of 25 cells
Base Shift Pressure 1-3 Pattern X 24 of 25 cells
Base Shift Pressure 1-4 Pattern X 19 of 25 cells
Base Shift Pressure 2-4 Pattern X 24 of 25 cells
Base Shift Pressure 2-6 Pattern X 25 of 25 cells
Base Shift Pressure 3-5 Pattern X 25 of 25 cells
Base Shift Pressure 4-6 Pattern X 23 of 25 cells
Base Shift Pressure 1-2 Pattern Y 18 of 25 cells
Base Shift Pressure 2-3 Pattern Y 21 of 25 cells
Base Shift Pressure 3-4 Pattern Y 20 of 25 cells
Base Shift Pressure 4-5 Pattern Y 16 of 25 cells
Base Shift Pressure 5-6 Pattern Y 24 of 25 cells
Base Shift Pressure 1-3 Pattern Y 24 of 25 cells
Base Shift Pressure 1-4 Pattern Y 19 of 25 cells
Base Shift Pressure 2-4 Pattern Y 24 of 25 cells
Base Shift Pressure 2-6 Pattern Y 25 of 25 cells
Base Shift Pressure 3-5 Pattern Y 25 of 25 cells
Base Shift Pressure 4-6 Pattern Y 23 of 25 cells
Base Shift Pressure 1-2 Pattern Z 21 of 25 cells
Base Shift Pressure 2-3 Pattern Z 23 of 25 cells
Base Shift Pressure 3-4 Pattern Z 25 of 25 cells
Base Shift Pressure 4-5 Pattern Z 23 of 25 cells
Base Shift Pressure 5-6 Pattern Z 24 of 25 cells
Base Shift Pressure 1-3 Pattern Z 24 of 25 cells
Base Shift Pressure 1-4 Pattern Z 19 of 25 cells
Base Shift Pressure 2-4 Pattern Z 24 of 25 cells
Base Shift Pressure 2-6 Pattern Z 20 of 25 cells
Base Shift Pressure 3-5 Pattern Z 19 of 25 cells
Base Shift Pressure 4-6 Pattern Z 25 of 25 cells
Base Shift Pressure 6-5 15 of 25 cells
Base Shift Pressure 5-4 18 of 25 cells
Base Shift Pressure 4-3 17 of 25 cells
Base Shift Pressure 3-2 11 of 25 cells
Base Shift Pressure 2-1 9 of 25 cells
Base Shift Pressure 6-4 17 of 25 cells
Base Shift Pressure 5-3 10 of 25 cells
Base Shift Pressure 4-2 10 of 25 cells
Base Shift Pressure 4-1 5 of 25 cells
Base Shift Pressure 3-1 8 of 25 cells
Discrete Shift Torque Low-Mid Thresh 10 of 11 cells
Discrete Shift Torque Mid-High Thresh 11 of 11 cells
Discrete Shift Torque Low 11 of 11 cells
Discrete Shift Torque Mid 11 of 11 cells
Discrete Shift Torque High 11 of 11 cells
Adaptive Pressure
Shift Adapt Preset Pressure 1-2 Oncoming 2 of 3 cells
Shift Adapt Preset Pressure 2-3 Oncoming 2 of 3 cells
Shift Adapt Preset Pressure 3-4 Oncoming 3 of 3 cells
Shift Adapt Preset Pressure 4-5 Oncoming 3 of 3 cells
Shift Adapt Preset Pressure 5-6 Oncoming 3 of 3 cells
Shift Adapt Preset Pressure 1-2 Oncoming Special 2 of 3 cells
Shift Adapt Preset Pressure 2-3 Oncoming Special 3 of 3 cells
Shift Adapt Preset Pressure 3-4 Oncoming Special 3 of 3 cells
Shift Adapt Preset Pressure 4-5 Oncoming Special 3 of 3 cells
Shift Adapt Preset Pressure 5-6 Oncoming Special 3 of 3 cells
Shift Adapt Preset Pressure 2-3 Offgoing 3 of 3 cells
Shift Adapt Preset Pressure 3-4 Offgoing 3 of 3 cells
Shift Adapt Preset Pressure 4-5 Offgoing 3 of 3 cells
Shift Adapt Preset Pressure 5-6 Offgoing 3 of 3 cells
Shift Adapt Preset Pressure 2-3 Offgoing Special 3 of 3 cells
Shift Adapt Preset Pressure 3-4 Offgoing Special 3 of 3 cells
Shift Adapt Preset Pressure 4-5 Offgoing Special 3 of 3 cells
Shift Adapt Preset Pressure 5-6 Offgoing Special 3 of 3 cells
Shift Adapt Preset Volume 3-4 Oncoming 35.000 : 33.000
Shift Adapt Preset Volume 4-5 Oncoming 20.000 : 24.000
Shift Adapt Preset Volume 5-6 Oncoming 45.000 : 55.000
Shift Adapt Preset Volume 3-4 Oncoming Special 35.000 : 33.000
Shift Adapt Preset Volume 4-5 Oncoming Special 20.000 : 24.000
Shift Adapt Preset Volume 5-6 Oncoming Special 45.000 : 55.000
Auto TCC
Apply/Release Speed
TCC Apply/Release Speed vs. TPS vs. Gear - Normal 17 of 136 cells
TCC Apply/Release Speed vs. %TPS - Normal 5th 3 of 34 cells
TCC Apply/Release Speed vs. TPS vs. Gear - Pattern B 17 of 136 cells
TCC Apply/Release Speed vs. TPS vs. Gear - Pattern B 5th 3 of 34 cells
TCC Apply Speed vs. %TPS vs. Gear - Hot 34 of 68 cells
TCC Apply Speed vs. %TPS - Hot 5th 17 of 17 cells
TCC Release Speed vs. %TPS vs. Gear - Hot 18 of 68 cells
TCC Apply Speed vs. %TPS vs. Gear - Hot TUTD 34 of 68 cells
TCC Release Speed vs. %TPS vs. Gear - Hot TUTD 51 of 68 cells
TCC Apply Speed vs. %TPS - Hot TUTD 5th 17 of 17 cells
TCC Release Speed vs. %TPS - Hot TUTD 5th 17 of 17 cells

Transmission Diagnostics
General
TUTD Switch
P0816 Downshift Ckt Enabled : Disabled
P0826 Shift Ckt Enabled : Disabled