Long time ago this is how chip tuning started.

We are able to make tuning for this Audi C4 2.5TDi Eng. code: AEL with erasable EPROMS.

There are 2 EEPROMS each with different maps.

In one eerpom there are torque limit map, drivers wish, injection pump voltage map. In second eeprom boost maps, incl. one byte max boost, injection timing, etc.

With good software optimization it is possible to get aprox. +70Nm and +30hp.

We used Batronix BX48 eeprom programmer, to read and write.

ECU BOSCH 0281001320 0281001321 VAG 4A0907401P

EEPROMS MSA11-7 2537355498 2537355497

Location of ECU - front passengers side - under foot matt

ECU nummber

EEPROMS:

ENGINE: