Volvo V40 T4

This is a a survey to tell your opinion about VEMS-ing a 2002 Volvo V40 T4, to get ~350Hp with stock internals and bigger turbo, injectors.

Is this a front-wheel drive or 4-wheels ?

Owner is reaching stock hardware limits at 270Hp (chipped stock ECU), and wants a standalone.

I've fears of all the new bells and whistles of the car, such as ABS, ESP, cruise control, immobiliser, etc....

Car is meant to be a comfortable daily driver

Does this car have ?

Hijack what?

We have to think about the work splitted between factory and piggy ECU. Min +18..32% bigger injectors needed, in any case. However, there are functions that can be controlled by either factory ECU or piggy.

For example, if all outputs are controlled by factory ECU, it would think MAP=190kPa, pumping 270 HP of air (injecting that much fuel), while in fact MAP=250kPa (and 350 HP of air), still injecting sufficient amount of fuel, due to the bigger injectors. (MAP/HP values just for the example, not real)


Involving the MAT and CLT signals in the cheating can help the final result, but make the system and mapping more complex, more error prone and riskier.

likewise, controlling more functions (like ignition) by the piggy adds more freedom, but adds complexity and other risks too. Life might produce more surprises than one might even think about, so just an example: controlling function from piggy might accidentally disable some safety mechanisms. Eg. if electronic throttle-plate stucks wide open, while the throttle pedal is released, the factory ECU might cut power with fuel and or spark. However, the piggy, not knowing about the malfunction, could happily continue adding power. Even with a manual gearbox, that is an unpleasant surprise. Dangerous.

If the car is FWD, than the whole project is certainly too expensive.

Even if the car is 4WD, than it only makes sense to experiment, if an experienced engine-tuner and an experienced programmer are available very cheap (like friends, who help for some beer+pizza+fun) and you are prepared to waste months, and take the risks (including having the car out of operation for some time, and possible damage to engine, car, or worse).