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Sign inVAG DQ250 clutch torque patch
This tool allows you to patch the 500Nm calculated clutch torque limitation in DQ250 Exx, Fxx and MQB gearboxes.
After the patch the gearbox can calculate up to 655 Nm of clutch torque and apply the correct pressure without having to decalibrate the clutch pressure adaptation.
This patch only fixes the limitations in the code. There are several limiters in the calibration area on clutch torque and current, which you will have to adjust as well.
See this example calibration on the Files site.
The DQ250 gearbox is also incapable of seeing more than 630 Nm torque on CAN (but calculated clutch torque is always a little higher), because in the multiplex message only 6 bits are allocated for torque (63*10), and DQ250 lacks the capability to read the special torque doubling bit that DQ381 and DQ500 use, as well as most ECU's not being able to send it.
A full unencrypted file is required for this patch, and you will also have to write the full file. If you write only the maps, then the patch will not get written to the TCU.
NB! You should have a tool capable of flashing the ECU in boot mode. While the patch is quite safe, if something goes wrong with the patch, then you will need to recover it in boot (SBOOT).
The price is 20 credits.
After you buy the functionality for a certain software (A2L ID), you can patch this software again as many times as you like without having to pay again.
Steps:
After the patch the gearbox can calculate up to 655 Nm of clutch torque and apply the correct pressure without having to decalibrate the clutch pressure adaptation.
This patch only fixes the limitations in the code. There are several limiters in the calibration area on clutch torque and current, which you will have to adjust as well.
See this example calibration on the Files site.
The DQ250 gearbox is also incapable of seeing more than 630 Nm torque on CAN (but calculated clutch torque is always a little higher), because in the multiplex message only 6 bits are allocated for torque (63*10), and DQ250 lacks the capability to read the special torque doubling bit that DQ381 and DQ500 use, as well as most ECU's not being able to send it.
A full unencrypted file is required for this patch, and you will also have to write the full file. If you write only the maps, then the patch will not get written to the TCU.
NB! You should have a tool capable of flashing the ECU in boot mode. While the patch is quite safe, if something goes wrong with the patch, then you will need to recover it in boot (SBOOT).
The price is 20 credits.
After you buy the functionality for a certain software (A2L ID), you can patch this software again as many times as you like without having to pay again.
Steps:
- Read the ECU in boot/bench mode (or with a tool that allows full read/write).
- Upload the file(s) here.
- Checksum and write file to ECU in boot/bench mode.
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