Jaguar 4.2 V8 Tuning
Supported in 3 Jaguar models, 2003+.
Jaguar
3 supported 4.2 V8 applications
Models With the Jaguar 4.2 V8
All Supported Jaguar 4.2 V8 Tunes
| Model | Years | Version | Stock power | Controller | Platform |
|---|---|---|---|---|---|
| XJ | 2003+ | X350 | 298 hp | ECU Denso MB279700 | AutoTuner |
| XK coupe | 2005+ | X150 | 298 hp | ECU Denso MB279700 | AutoTuner |
| XK8 | 2006+ | 298 hp | ECU Denso MB279700 | AutoTuner |
About Jaguar 4.2 V8 tuning
We tune the Jaguar 4.2 V8 in 3 applications across the XJ, XK coupe, XK8, from 2003+, in gasoline form, with stock outputs of 298 hp. Calibrations are written on AutoTuner for your exact hardware and fuel, then proven on our Dynojet 424xLC2 in Jenison, MI.
This engine runs on: Denso MB279700.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.