The ECU on any car is setup using a few cars until they determine what is the best configuration for them to provide what they want and not to cause any issues in the future for them to repair under warranty. With that said the programming on the ECU is very tame to what is possible.
So whether you do any modifications or not a remap is beneficial. As you accelerate there is a power curve and if you run a factory setup on a dyno to observe this you will see that this curve is not that great as it is not a smooth curve. With a remap the curve is smoothed out and puts more power where you need it and that is in the middle of the curve. Also an improvement in fuel economy is possible, I say possible because your driving habits depict your fuel economy. Other things that can be done with a remap is an increase in power and this can be achieved with or without any other modifications done to the car. Of course other modifications done can provide more power. Ultimately the engine can only handle so much but having done necessary modifications is key for longevity of the engine. Remaps are detectable but only if there is a reason to look at the ECU. In most services of cars the dealership has no reason to check the ECU and so it will not be noticed. The times an ECU will be checked is when you take it in for an EML situation in which the code points to the ECU, or if an update needs to be done to the ECU. A remap is customized to your car if done right. Always do background research on the place doing the remap because the ECU is the heart of the car and not cheap to replace.
Now with a module such as the RaceChip we sell, this does not do any permanent changes to the ECU in any way, but sends signals to the ECU based upon how you are driving the car. It can also be modified from it's factory settings to your liking. You can remove and re-install the module any time you want because it does not do permanent changes, so it will not be detected even if the ECU is looked at. Now some cars do have what they consider more intelligent ECU's that can remember such devices, but I have not heard of these on the RCZ.
At the end of the day you can drive the car you have as it is, but if you want a little more and better performance then a remap or a module is great to do. Pushing your cars performance to higher numbers are risky if not done correctly, so be careful.
As for power results from the 2.0 HDi in the RCZ, over 200bhp is possible but it is your torque that you need to be careful about from the diesel as it can cause problem within the drive train of the car.
I hope this is helpful to you and anyone else thinking about a remap or module for your RCZ whether you have a diesel or petrol version.
Here is the link to what RaceChip can provide possible in regards to performance gains:
http://www.rczperformance.com/EngineTuning.html#Race-Chip
And yes we sell these :thumbup:
