Originally Posted by
DSteck
Even so, has anybody written anything about how to properly scale everything?
The write-up would take days of work to make it complete and proper. Like I said, there are probably 50 or more parameters that would need to be scaled, at least what I have researched and actually modified (thanks to input by Greg). There's also parameters we don't have access to in HPT, but for the most part what they give us is plenty to make this work just fine. On the Gen4 calibrations, some of the knock sensor parameters even are based on airflow (Knock Sensor Multipliers, Knock Sensor Tip In Transient Mode Airmass Min, Knock Retard Decay Decay Rate, Burst Knock Retard Base vs. CylairDelta, and Static Retard Enable), so that has to be taken into account, as well, otherwise the knock sensor sensitivity/measurement of the cylinders will be off.
Just remember, it's ANY parameter that references airflow and torque, so this means the shift pressure parameters, as well. For example:
Gen 3 Auto vehicles:
Open an '02 Camaro/Firebird A4 file, and this is the stock normal table:
Code:
ft.lb---> 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640
1 -> 2 Shift 0 0 0 0 2 4.4 7 10.2 13.7 16.9 20.7 24.7 27.5 32 35.6 39.4 42.8 46 48.8 52 54 56 59.1 61.5 64.4 67.3 70.5 73.2 75.4 77.6 79.2 81.7 84.9
2 -> 3 Shift 0 0 0 0 3 6 9.7 13.3 17 21.6 26 29.3 32.3 34.6 36.3 38 40 40.9 42.4 44.4 46.2 48.7 51 53.8 56.6 59.1 61.6 63.4 65 66.6 67.8 69.3 71.2
3 -> 4 Shift 0 0 0 1.5 3.4 6.8 10.2 13.6 17 19.3 22.9 26 29.5 32.7 36 39.4 42.9 46.4 50.3 54.5 58 61.4 64.8 68.2 71.6 75 78.4 81.8 85.3 88.7 90 90 90
If you do a scale by 50%, then ALL your estimated torque by the pcm would be 1/2 of what it was originally, so you would need to change the table to this:
Code:
ft.lb---> 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600 620 640
1 -> 2 Shift 0 0 0 7 13.7 20.7 27.5 35.6 42.8 48.8 54 59.1 64.4 70.5 75.4 79.2 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9 84.9
2 -> 3 Shift 0 0 0 9.7 17 26 32.3 36.3 40 42.4 46.2 51 56.6 61.6 65 67.8 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2 71.2
3 -> 4 Shift 0 0 0 10.2 17 22.9 29.5 36 42.9 50.3 58 64.8 71.6 78.4 85.3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
Do you see how that works? You start at the far left, leave the 0 column alone, and then take whatever is double of the next column, find that data, and then paste into the next column. Meaning, you take the 40 column and paste that into the 20 column, the 80 column and paste that into the 40 column, the 120 column and paste that into the 60 column, the 160 column and paste that into the 80 column, etc, etc, etc, then fill all the remaining columns with the last column once you get past the column that is 1/2 of the last columns ft.lb value (in this case, the last column is 640, so all columns 320 and above have the same value). This still allows the tcm to deliver the correct shift pressures to the trans. If you don't do this, you'll get much less pressures on the shift, and that will eventually burn the transmission up. Does that make sense? Trust me, it's right, however.
Gen 4 Auto (A4 or A6) vehicles:
As long as you have the latest beta, you can actually edit the ft.lb axis labels on the Gen4 vehicles, which makes this a lot easier. In example, open an '08 C6 A6 file, and the "Base Shift Pressure Upshift - X, 1-2" table shows:
Code:
0 111 221 332 443
-22 145 145 145 145 145
14 102 145 145 145 145
68 58 145 145 203 203
86 58 145 145 203 203
257 58 145 145 203 203
(Note: ft.lb is at the top, and on the left hand side is Trans Oil Temp)
So by doing a 50% scale, you'd do this:
Code:
0 55.5 110.5 166 221.5
-22 145 145 145 145 145
14 102 145 145 145 145
68 58 145 145 203 203
86 58 145 145 203 203
257 58 145 145 203 203
One day I'll do a writeup on everything I changed, and even try to do it complete with pictures.
Is it possible to put one of the later PCMs with the higher CAM limit in an '06 vehicle?
My thinking on this is YES for any '06-'07 LS2, '06-'09 LS7, and '08 LS3 (they didn't have the higher IFR limit that the '09 LS3 does)! You would more than likely need three things:
1: '09 LS3 pcm and calibration (both hardware and software)
2: Pedal assembly
3: TB
I don't think anything has changed, but pinouts would need to be compared, as well.