Caterpillar C4 All years TH337 Acert 128hp (94kW) 499Nm remap
Standard this engine makes 128hp and 499Nm. Our Stage 1 file takes it to 153hp and 612Nm.
Where the power arrives
Both curves scaled from the manufacturer figures, on the Stage 1 file.
- Standard 128hp
- Remapped 153hp
- Standard 499Nm
- Remapped 612Nm
Stages for this engine
Stage 1 needs nothing fitted. Anything above assumes the supporting hardware is on the car already.
Every figure for the TH337 Acert 128hp (94kW) 499Nm
| File | Power | Gain | Torque | Gain | Price |
|---|---|---|---|---|---|
| Standard | 128hp | n/a | 499Nm | n/a | n/a |
| Stage 1 | 153hp | up 25 | 612Nm | up 113 | ask us |
Economy files show no new power figure because they are written for torque and drivability rather than peak output.
Remapping the TH337 Acert 128hp (94kW) 499Nm
The Caterpillar C4 All years TH337 Acert 128hp (94kW) 499Nm 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 C4 range, or everything we do for Caterpillar.
Book your C4
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.