Forced induction cars – those with a turbocharger, supercharger or sometimes both – always respond better to remapping than naturally aspirated cars and by better, we mean they will achieve a 20-30% increase in power and torque versus the 5-10% in a naturally aspirated car. But why is this? Why do forced induction cars get it so good?

The reason why forced induction cars respond better to remaps is because their turbocharger or supercharger boost pressures can effectively be increased, alongside ignition timing, fuel ratio and fuel pressure parameters. Naturally aspirated engines in most cases will only benefit from ignition timing, fuel ratio and fuel pressure changes. To help you understand this fact a little better, consider this; most cars have two important points on their map – idle and part throttle cruising. All of the points in between are controlled by your car’s ECU in a predetermined pattern. A remap alters this pattern – it effectively increases the number of points before the above parameters are altered.

And so, turbochargers and superchargers make such a difference to remap gains because they allow for much more leeway than an engine without them. Here’s an example:

  • Volkswagen Golf 2.0 FSI MK5 stage 1 gains – 9bhp and 10 nm
  • Volkswagen Golf 2.0T FSI GTI MK5 stage 1 gains – 41bhp and 54 nm

As you can see, the addition of a turbocharger makes a HUGE difference to the gains.

What responds better then, turbo-diesel or turbo-petrol?

Turbo-diesel engines produce more torque than turbo-petrol engines in like-for-like capacities, and they benefit from greater additional torque than turbo-petrol engines after a remap. However, turbo-petrol engines usually benefit from greater additional bhp than turbo-diesel engines after a remap. And in the end, a like-for-like turbo-petrol will always be quicker than a like-for-like turbo-diesel after a stage 1 tune – for example, a stage 1 Ford Focus ST 2.0T will be faster than a stage 1 Ford Focus ST 2.0 TDCI.

Our experience tells us that they’re equal in terms of benefit, though. Both turbo-diesel and turbo-petrol cars respond brilliantly to remapping – once mapped, you’ll never go back!

And what about supercharged engines?

Supercharged engines respond extremely well to remapping. For example, our remap for the Mini Cooper S R52/R53 adds 44bhp and 61 nm. That’s a lot of extra power and torque – and the same kinds of gains can be had on the likes of the Range Rover supercharged. But, such forced induction methods are not popular with manufacturers at the moment, with most going down the turbocharged route. And so when choosing a remap specialist for your supercharged car, please ensure that you choose a company like Hyperchips who have a wealth of experience with tuning supercharged machines.

We hope this article answered your questions – be sure to share your thoughts with us by commenting below or join the discussion on Facebook.