2003 c5 n20 cos

[Webbs]

I am wondering what COS I can use on a 2003 C5 that has the N20 function of the COS-5

Thank you,

[gmperformancecentre]

you could flash in os 12212156 (2002 corvette tune) and then flash in custom os 02020005 which has nos
not sure if you can do this but someone on here can confirm this

[joecar]

www.holdencrazy.com (http://www.holdencrazy.com) has the 12212156 (2002 corvette tune) mentioned above by GMPC.

Copy any tables that are different from your 2003 file to this 2002 file (there should not be many);
then full flash in the 2002 file;
make sure your C5 runs correctly;
then follow the COS upgrade tutotial;
make sure to fix the out-of-range cells.

COS5:
showthread.php?t=2599 (http://forum.efilive.com/showthread.php?t=2599)
showthread.php?t=2270 (http://forum.efilive.com/showthread.php?t=2270)

Fixing Out Of Range Cells:
showpost.php?p=87052 (http://forum.efilive.com/showpost.php?p=87052&postcount=14) post #14
showthread.php?14119-3000-RPM-max-and-setting-codes-03-Z06-with-Magnuson-at-150kPa (http://forum.efilive.com/showthread.php?14119-3000-RPM-max-and-setting-codes-03-Z06-with-Magnuson-at-150kPa) posts #14, #17
showthread.php?14654-I-need-help-getting-the-most-out-of-my-car (http://forum.efilive.com/showthread.php?14654-I-need-help-getting-the-most-out-of-my-car) post#2

[Webbs]

Thanks I will try this this weekend

W~

[Highlander]

2003 corvettes are/were 1mbyte pcms! Or was this only on 2004?

[gmperformancecentre]

2003 512k
2004 1mb

[Taz]

As always, Corvettes are the except to most rules. The 2003 Corvette PCMs were a carry over of the 2002 512 Kb design (while other platforms transitioned to the 1 Mb PCM). Corvettes got the 1 Mb PCM in 2004 - a one year only event - transitioning to the E40 the following year (2005).


Regards,
Taz