benjaminh2 Posted September 22, 2008 Report Share Posted September 22, 2008 That is unless your PCM is locked so that the dealer cannot gain access to the program.......yes they'll know it's tuned since it's locked, but they cannot screw with it. Only and absolute Einstein with a Tech2 will be able to crack it(rare). its actually not hard at all to tell if a pcm has been tuned. when the tech2 is plugged into the vehicle,and service programing is selected, and vehicle info requested, the programing calibration numbers are displayed on on a pc screen, if the calibration number doesnt match any of the ones listed by gm, then its an "unsupported" cal. number. checking for this takes about 3 min., however unless you show up with mechanical damage like a couple other guys mentioned, no flat rate tech would waste his time checking. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted September 22, 2008 Report Share Posted September 22, 2008 Even at what you are turning, that calculates to 50.7 MPH in 1st gear and 96.8 MPH in second, assuming you are running 3.73 gears and 275/55R20 tires. That's pretty good. That's pretty close Mike, with the 3.73 and stock 20's, it's around 48mph 1st and 92 in 2nd. I just click into 3rd before crossing the line, trapping around 95-96mph. Quote Link to comment Share on other sites More sharing options...
Zath Posted September 23, 2008 Report Share Posted September 23, 2008 Weird.. my stock first shifts at 5800 at 40mph, hard shift thought that was stock readings. Maybe newer max is different Quote Link to comment Share on other sites More sharing options...
Vortec MAX Posted September 23, 2008 Author Report Share Posted September 23, 2008 (edited) 5800 in first gear should get your 2004 SS up to 43.9 MPH if you are running 275/55R20 tires. I believe the stock tune will only let you rev to 5600, which will get you to 42.4 MPH. Also keep in mind that these speeds are hypothetical, since the torque converter allows slippage. This means that you will see the RPM sooner than the MPH that corresponds (if no slippage occurred). Mike Edited September 23, 2008 by Vortec MAX (see edit history) Quote Link to comment Share on other sites More sharing options...
ripsass Posted October 13, 2008 Report Share Posted October 13, 2008 If you keep your stock PCM and swap in a tuned one will you have to do a CASE re-learn each time you swap them back and fourth, or just the one time when installing the tuned one for the first time? Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted October 13, 2008 Report Share Posted October 13, 2008 If you keep your stock PCM and swap in a tuned one will you have to do a CASE re-learn each time you swap them back and fourth, or just the one time when installing the tuned one for the first time? you only have to do the SECURITY relearn once on the new tuned PCM....once a PCM has been in your vehicle, you should not have to do another re-learn Quote Link to comment Share on other sites More sharing options...
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