Jerks during acceleration

[EHOT]

Hello. I am from Ukraine, please forgive me for my English. I ran into a problem with my Mazda 3 MPS 2007. When I get overclocked, I get boost surges. No errors on the dashboard does not issue. I own the car since 2013. This problem was from the very beginning of my ownership.
I bought a standard car. At the moment there is a tuning kit COBB STAGE 3.
Diagnostics "Turbogarage" PAT pointed out that the torque limit signal is on.
During the attempt to fix the problem, the engine control unit changed. In addition, when removing the fuses on the ABS / DSC unit, the problem falls.

[EHOT]

I incomprehensibly described the problem?

[Vansquish]

Originally Posted by EHOT I incomprehensibly described the problem?

I am not sure I understand the problem that you are having. You mentioned that you have a Cobb Stage 3 tuning kit. That makes me wonder two things in particular.

1. Do you have a custom tune for the car?

2. Are you using an off-the-shelf (OTS) tune instead?


The datalog that you uploaded does not really tell us very much. Because you do not maintain a constant or gradually increasing accelerator pedal position, the data is very inconsistent. As a result, it is very difficult to tell if movement of your foot on the accelerator pedal is causing the fluctuations in throttle position, boost, mass airflow, and so forth.

[EHOT]

Originally Posted by Vansquish I am not sure I understand the problem that you are having. You mentioned that you have a Cobb Stage 3 tuning kit. That makes me wonder two things in particular. 1. Do you have a custom tune for the car? 2. Are you using an off-the-shelf (OTS) tune instead? The datalog that you uploaded does not really tell us very much. Because you do not maintain a constant or gradually increasing accelerator pedal position, the data is very inconsistent. As a result, it is very difficult to tell if movement of your foot on the accelerator pedal is causing the fluctuations in throttle position, boost, mass airflow, and so forth.

It is a program Cobb stage 3 95 ron or 98 Ron.
The accelerator pedal is at the same level of depression.

[Vansquish]

Originally Posted by EHOT It is a program Cobb stage 3 95 ron or 98 Ron. The accelerator pedal is at the same level of depression.

The datalog clearly shows that the accelerator pedal is not at a constant level of depression. There are significant fluctuations in Accelerator Pedal Position data.

What aftermarket parts are installed on the car?

[EHOT]

Originally Posted by Vansquish The datalog clearly shows that the accelerator pedal is not at a constant level of depression. There are significant fluctuations in Accelerator Pedal Position data. What aftermarket parts are installed on the car?

See datalog closer to the end. It was both on a standard car, and with tuning. I can not understand what you mean by the term aftermarket parts?

At the moment, the standard enumerated engine, past G2, the new original turbocharger.

[EHOT]

I'll try to describe it differently. If you go by car, 4th gear is included. With an average acceleration, the accelerator pedal ~ 40%, engine 2000-3000 rpm. Boost 0 Psi. It is not clear where the kick comes from and the boost starts to jump 0-0.7-0-0.7 psi. This continues until you release the accelerator pedal.
https://youtu.be/_v0m7FgKu2U

[Thor Hammer]

Originally Posted by EHOT I'll try to describe it differently. If you go by car, 4th gear is included. With an average acceleration, the accelerator pedal ~ 40%, engine 2000-3000 rpm. Boost 0 Psi. It is not clear where the kick comes from and the boost starts to jump 0-0.7-0-0.7 psi. This continues until you release the accelerator pedal. https://youtu.be/_v0m7FgKu2U

You need to take a WOT log in 3rd or 4th gear. 3K to 6K rpms.

[EHOT]

Originally Posted by Thor Hammer You need to take a WOT log in 3rd or 4th gear. 3K to 6K rpms.

This problem comes from the DSC block, it gives the command to limit the torque. because of this, these jumps of supercharging appear. With a mechanical system shutdown - removing the fuses on the ABS / DSC problem disappears. I changed the ABS / DSC unit, the combined sensor and the steering position sensor did not help.

[EHOT]

Mileage on my car is currently 80,000 kilometers. In connection with the fall of compression in the third cylinder, I did an overhaul of the engine. During the repairs, the main and connecting rod bushings, connecting rods and piston G2, rings, oil pump, new original turbocharger, flywheel, clutch were replaced. Before this repair, the car was standard, without tuning. After the repair was installed The Stage 3 Power Package COBB.

I repeat that the problem is not in the motor and its software.
I went to Kiev to Sasha PAT (this is our local tuner of the Ministry of Railways, maybe you heard about him), unfortunately he didn’t have enough days to sort out the problem completely. The only thing he said is that the engine control unit receives a signal to limit the torque on the CHAN bus, it seems that the car seems to be skidding, and programmatically by temporarily turning off the perception of the singal by the engine control unit to limit traction. This signal most likely comes from the DSC block. Changed both the DSC unit itself, and the combined sensor and rudder position sensor did not help.
There is a possibility that a failure occurs in the ABS sensors, but at that time, does not it show an error on the instrument panel?

[Thor Hammer]

Originally Posted by EHOT Mileage on my car is currently 80,000 kilometers. In connection with the fall of compression in the third cylinder, I did an overhaul of the engine. During the repairs, the main and connecting rod bushings, connecting rods and piston G2, rings, oil pump, new original turbocharger, flywheel, clutch were replaced. Before this repair, the car was standard, without tuning. After the repair was installed The Stage 3 Power Package COBB. I repeat that the problem is not in the motor and its software. I went to Kiev to Sasha PAT (this is our local tuner of the Ministry of Railways, maybe you heard about him), unfortunately he didn’t have enough days to sort out the problem completely. The only thing he said is that the engine control unit receives a signal to limit the torque on the CHAN bus, it seems that the car seems to be skidding, and programmatically by temporarily turning off the perception of the singal by the engine control unit to limit traction. This signal most likely comes from the DSC block. Changed both the DSC unit itself, and the combined sensor and rudder position sensor did not help. There is a possibility that a failure occurs in the ABS sensors, but at that time, does not it show an error on the instrument panel?

So let me get this straight. You have a stock motor (maybe you have an intake that is NOT stock?) and you installed the Stage 3 Tune on the AP from COBB??? If so, that wont work and cause a lot of issues. Your Mass Air Flow sensor calibration will be way off for one!

Put the stock tune back on the car. Or Stage 1 OTS tune.

[EHOT]

Originally Posted by Thor Hammer So let me get this straight. You have a stock motor (maybe you have an intake that is NOT stock?) and you installed the Stage 3 Tune on the AP from COBB??? If so, that wont work and cause a lot of issues. Your Mass Air Flow sensor calibration will be way off for one! Put the stock tune back on the car. Or Stage 1 OTS tune.

How to connect the physical shutdown of the DSC and the disappearance of the problem? The air flow sensor was calibrated - it did not help.

[Vansquish]

SWAS strikes again?

[EHOT]

Originally Posted by Vansquish SWAS strikes again?

No, the SWAG display does not light up. Even when the SWAS is switched off mechanically, the motor torque limit is still triggered, although at this point the SWAG lamp is constantly on.