The Mégane II Owners' Club

If money was no object (I wish ) would it make sense to add another turbo to a dci engine to boost performance? So for example for a 2.0 dci engine instead of having one turbo that gives a boost between 1500 and 2300 rpm you would have one smaller one that gives boost from 1400 to 2000 and another from 2000 to 2400 rpm?

If I am not mistaken isnt this how BMW uses their twin turbo systems?

Theoretically, yes, this is how BMW have tuned some engines.

I would imagine though, that you would have to jettison any variable vane Garrett unit and install full wastegate/dump valve dual assembly. Then would come the necessary sensors and a probable custom ECU. I've seen it done on older cars - a mate restored and updated a Rover SD1 putting in a Chevvie V8 and turbo. It took him 10 years (a hobby) and around £10k to do. It was comparatively easy since the original engine was a petrol with carburettor so the electronics was simple. I made a custom lambda monitor for it. He eventually got around 400bhp out of it and still takes it on track days.

On a more modern car though, with all the electronics, the mind boggles... If you have a plan, let us know!

"I have a dream" or rather I have a plan to start to have a play on the engine. not mine but thought of maybe buying a written off car where the engine is still healthy and conducting experiments.