Sct Software

[Tobey]

How close does it get the desired boost? Not sure what you mean by how often.

It ends up over the desired boost.

To give you an idea. This is WOT it in second gear. EDIT: There is actually a dip in there - this was traction control kicking in, but me keeping it planted.

PSI Desired PSI RPM

0.0 7.568762279 2662

0.0 7.568762279

0.1 7.568762279

0.1 7.568762279

0.2 7.568762279

0.3 7.568762279

0.3 7.568762279

0.3 7.568762279

0.5 7.568762279

0.6 7.568762279

0.7 7.568762279

0.8 7.568762279

0.8 7.568762279

0.9 7.568762279

1.0 7.568762279

1.1 7.568762279

1.1 7.568762279

1.2 7.568762279

1.3 7.568762279

1.4 7.568762279

1.5 7.568762279

1.7 7.568762279

1.7 7.568762279

1.8 7.568762279

1.8 7.568762279

1.9 7.568762279

2.1 7.568762279

2.2 7.568762279

2.2 7.568762279

2.4 7.568762279

2.5 7.568762279

2.6 7.568762279

2.7 7.568762279

2.8 7.568762279

2.9 7.568762279

3.1 7.568762279

3.2 7.568762279

3.3 7.568762279

3.5 7.568762279

3.5 7.568762279

3.7 7.57651277

3.9 7.57651277

4.0 7.634484283

4.2 7.634484283

4.2 7.665427308

4.4 7.665427308

4.6 7.730039293

4.7 7.730039293

4.8 7.730039293

4.9 7.723634578

5.2 7.723634578

5.3 7.77172888

5.4 7.77172888

5.7 7.800928291

5.8 7.843924361

5.8 7.843924361

5.8 7.883153242

6.0 7.883153242

6.3 7.893064833

6.5 7.893064833

6.6 7.955761297

6.9 7.955761297

7.1 7.969130648

7.2 7.969130648

7.3 8.028202358

7.5 8.028202358

7.7 8.047671906

8.0 8.047671906

8.3 8.047671906

8.5 8.079646365

8.7 8.08956778

8.9 8.08956778

9.0 8.154199411

9.1 8.154199411

9.4 8.20574165

9.5 8.20574165

9.7 8.20574165

10.0 8.211827112

10.2 8.211827112

10.3 8.27703831

10.5 8.27703831

10.7 8.316611002

10.9 8.316611002

11.3 8.40793222

11.5 8.40793222

11.8 8.440044204

11.9 8.525004912

12.2 8.525004912

12.4 8.575500982

12.5 8.575500982

12.7 8.575500982

12.9 8.648433202

13.1 8.648433202

13.1 8.648433202

13.2 8.703384086

13.4 8.703384086

13.5 8.762647348

13.6 8.762647348

13.7 8.778737721

13.9 8.778737721

14.0 8.778737721

14.1 8.853953831

14.1 8.939729862

14.2 8.967175835

14.4 8.967175835

14.3 9.103222004

14.4 9.103222004

14.5 9.21327112

14.5 9.21327112

14.5 9.268614931

14.5 9.268614931

14.6 9.488192534

14.7 9.488192534

14.7 9.696905697

14.6 9.696905697

14.6 9.795800589

14.7 9.795800589

14.4 9.885437132

14.6 10.08912083

14.9 10.08912083

15.0 10.53561886

14.7 10.53561886

14.6 10.53561886

14.6 10.97880648

14.7 10.97880648

14.6 11.32764735

14.5 11.32764735

14.5 11.71310413

14.6 11.71310413

14.5 12.21916503

14.5 12.21916503

14.4 12.48035363

14.3 12.48035363

14.3 12.48035363

14.3 12.48035363

14.2 12.48035363

13.9 12.48035363

13.8 12.48035363

13.9 12.48035363

13.9 12.48035363

13.9 12.48035363

14.0 12.48035363

14.1 12.48035363

13.9 12.48035363

13.6 12.48035363

13.6 12.48035363

13.9 12.48035363

14.2 12.48035363

14.4 12.48035363

14.5 12.0372446

14.8 11.36395383

15.1 11.36395383

15.2 10.66650786

15.6 10.66650786

16.0 9.926095285

16.4 9.926095285

16.7 9.926095285

17.0 9.620137525

17.5 9.620137525

18.0 9.479425344

18.5 9.479425344

18.4 9.544739686

18.3 9.544739686

18.6 10.33184676

18.7 10.33184676

18.3 10.33184676

18.1 11.74194499

17.8 12.20414538

17.4 12.20414538

17.3 12.15921906

17.1 12.15921906

16.7 12.48035363

16.4 12.48035363

16.2 12.48035363

15.9 12.48035363

15.9 12.48035363

15.9 12.48035363

15.6 12.48035363

15.1 12.48035363

14.9 12.48035363

15.0 12.48035363

14.9 12.48035363

15.0 12.48035363

14.7 12.48035363

14.4 12.48035363

14.6 12.48035363

14.6 12.48035363

14.7 12.48035363

14.5 12.48035363

14.2 12.48035363

14.5 12.48035363

14.3 12.48035363

14.1 12.48035363 5712

14.3 12.48035363

14.4 12.48035363

14.5 12.48035363

14.6 12.48035363

14.4 12.48035363

14.1 10.64341847

14.1 8.806483301

14.0 8.806483301

14.1 7.077603143

14.2 6.369774067

14.2 1.809081532

14.3 -6.973968566

14.3 -10.80034676

14.3 -14.06033998

13.7 -10.74892829

13.2 -14.53339882

13.0 -14.53339882

11.6 -14.53339882 4918

Edited 23/03/11 03:10 AM by Tobey

[IH8TOADS]

Tobey your car is tuned in open loop so it runs off the wastegate DC table only. You can confirm this by logging the proportional gain under 'turbocharger' and/or export the log to .csv and you should notice for particular RPM's the wastegate figure is the same. If the wastegate dc is variable at say 4000rpm you know the PI system is active. FORDPSI change your normaliser table for the X axis so it starts at 2000rpm so you have more rpm breakpoints when the car is on boost. It will give more precise feed fwd control for the PI system.

[IH8TOADS]

Tobey you have a desired boost of 55. That's 27psi. I have NFI why a tuner would do that! Ignore desired boost in your case and use the map - bap method for determining you boost curve.

[IH8TOADS]

It looks like you are subtracting bap from desired boost? With your car tuned in open loop, the desired boost table in not active, don't even bother logging it. You can see the boost spike from where u change gear. Zf right? I cant view sigs on the iPhone.

Edit spelling!

Edited 23/03/11 03:28 AM by IH8TOADS

[FORDPSI]

FORDPSI change your normaliser table for the X axis so it starts at 2000rpm so you have more rpm breakpoints when the car is on boost. It will give more precise feed fwd control for the PI system.

Will do thanks again!

[FORDPSI]

Tobey has your turbo been ported and had a larger actuator fitted? Im assuming it has.

Edited 23/03/11 03:27 AM by FORDPSI

[Tobey]

It looks like you are subtracting bap from desired boost? With your care tuned in open loop, the desired boost table in nit active, don't even bothe logging it. You can see the boost spike from where u change gear. Zf right? I can view sigs on the iPhone.

Yea im calculating the desired boost as (DB-29.59)/2.036 Which gives a figure that seems right.

The boost spike isnt changing gear, that is traction control killing the revs at ~5000rpm, then it picking back up again to 5700rpm. Its 6 speed manual and I didnt get out of second...

Turbo is stock. My race tune has a peak of 18psi at about 3000rpm.

problem is I dont have my wastegate done, so I can see how much its struggling to maintain the boost.

What's the difference between closed and open loop? Pro's cons?

[Tobey]

Tobey has your turbo been ported and had a larger actuator fitted? Im assuming it has.

Nope both stock... It is however doing well to hold it at 14psi at 5700rpm...

EDIT: keep in mind, this is only second gear. I think there would be a dramatic difference in third and fourth (which I cant test because of slipping clutch)...

Edited 23/03/11 03:32 AM by Tobey

[FORDPSI]

That will also explain your overboosting.. But desired boost of 55.mmmmmm

[IH8TOADS]

You subtract bap from map, NOT bap from desired. Well it's definately in open loop. pros of closed loop are many. Gets on boost quicker in lower gears and won't overboost in high gears (5th etc). Reason is the PI control modifies the duty cycle to match the desired boost, so in low gears it's adding duty and in 5th and 6th it's removing duty cycle to prevent over boost. End result, consistent boost across all gears and loads. A big exhaust and no porting is bad news on the street. Might make a pretty graph on the dyno but hit 5th an watch boost rise and afr's lean. Nothing wrong with open loop IF the setup is good an your not flogging it in 5th or 6th.