Thinking about getting a G8
05-26-2012, 09:58 AM
#24
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Join Date: Aug 2009
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It's true that there were fewer 09.5 models made in general. The "big list" of differences is... http://www.g8board.com/forums/showthread.php?t=21160
Control Systems:
ECM (GT/GXP Share Same New OS)
TCM (GT/GXP Share Same New OS)
BCM (New 09.5 Calibration with many subsystem changes)
IPC (Totally New Hardware/Calibration NOT Compatible with 08/09)
Radio (New Part # for Face and Unit)
VCIM (New Part to add Bluetooth)
Interior:
Cup Holders Added To Rear Seat Bottom
Engine:
New Valley Plate/Oil Module for L76
New Timing Chain Tensioner
New Water Pump
New Radiator Hoses
New ECM Mounting Bracket
New Camshaft for L76 (Unverified physically but very likely)
New Diameter for foul air passage
Exhaust:
Additional Two Pup Cats Added to Mid Pipe Section for GT/GXP
Body:
Rear fascia retooled for GXP Style Valence (may have happened earlier in 09 not sure)
The ECM/TCM OS change was a big one... it's the first thing my tuner noticed when he fired it up, couldn't really use everything from tunes of older model G8s that he had in his library. His observation was it had more similarities with his Corvette tunes than anything else... not perfect 1:1 but within that general ballpark. Makes sense since the GXP has the LS3.
Control Systems:
ECM (GT/GXP Share Same New OS)
TCM (GT/GXP Share Same New OS)
BCM (New 09.5 Calibration with many subsystem changes)
IPC (Totally New Hardware/Calibration NOT Compatible with 08/09)
Radio (New Part # for Face and Unit)
VCIM (New Part to add Bluetooth)
Interior:
Cup Holders Added To Rear Seat Bottom
Engine:
New Valley Plate/Oil Module for L76
New Timing Chain Tensioner
New Water Pump
New Radiator Hoses
New ECM Mounting Bracket
New Camshaft for L76 (Unverified physically but very likely)
New Diameter for foul air passage
Exhaust:
Additional Two Pup Cats Added to Mid Pipe Section for GT/GXP
Body:
Rear fascia retooled for GXP Style Valence (may have happened earlier in 09 not sure)
The ECM/TCM OS change was a big one... it's the first thing my tuner noticed when he fired it up, couldn't really use everything from tunes of older model G8s that he had in his library. His observation was it had more similarities with his Corvette tunes than anything else... not perfect 1:1 but within that general ballpark. Makes sense since the GXP has the LS3.
