Engine

Cummins ISX All years 425ST 14.95L 428hp (315kW) 2244Nm remap

Standard this engine makes 428hp and 2244Nm. Our Stage 1 file takes it to 505hp and 2488Nm.

+77horsepower

+244newton metres

1stage available

Where the power arrives

Both curves scaled from the manufacturer figures, on the Stage 1 file.

Power before and after

Standard 428hp
Remapped 505hp

Torque before and after

Standard 2244Nm
Remapped 2488Nm

Stages for this engine

Stage 1 needs nothing fitted. Anything above assumes the supporting hardware is on the car already.

Stage 1505hpup 772488Nmup 244

Every figure for the 425ST 14.95L 428hp (315kW) 2244Nm

File	Power	Gain	Torque	Gain	Price
Standard	428hp	n/a	2244Nm	n/a	n/a
Stage 1	505hp	up 77	2488Nm	up 244	ask us

Economy files show no new power figure because they are written for torque and drivability rather than peak output.

Remapping the 425ST 14.95L 428hp (315kW) 2244Nm

The Cummins ISX All years 425ST 14.95L 428hp (315kW) 2244Nm runs a factory calibration built to cope with poor fuel, skipped servicing and hot countries. We rewrite the fuelling, boost and timing for this engine on this car, then test it before you get it back. The original file is kept, so it can go back to standard whenever you want.

On the petrol side the difference shows in throttle response and in how hard it pulls through the top half of the rev range. It feels sharper off idle and keeps going where it used to flatten out.

Figures on this page are for a standard car in good health. We read the fault codes and check the basics first, and if something needs attention we will tell you before we write anything. Have a look at the other engines on the All years, the full ISX range, or everything we do for Cummins.

Other engines on this ISX

All years cars.

Book your ISX

We write and test every file at our Aston workshop, on our own rolling road. Ring us with your reg and we will tell you what your car should make before you commit to anything.

Call 0121 238 8663 Ask a question