One significant change from the early models to these later ones is the use of an ECU to monitor the performance of the engine and adjust fuel flow accordingly.

[1] In the late 1980s there was a need for a similar but more powerful engine for the next generation of the cruise missiles and drones.

They increased the air flow through the engine and added a fourth compressor stage (hence the name).

Toloue-4 is used in several Iranian military equipment including Iran's copy of C-802, the Noor missile.

[2] This variant produced 4.0 kN (900 lbf) of thrust, and was chosen to power the now-canceled Beech BQM-126 target drone.

It is aimed at target drone aircraft, and is essentially identical to the 60-30 except for being de-rated to 5.4 kN (1,200 lbf) to extend the engine's life.

This engine is used in the MBDA Apache and Storm Shadow / SCALP EG cruise missiles.