Absolutely awesome thanks for that. Fascinating to see this with absolutely no other changes.we made a video
Acceptable changes - It does not count as a ‘substantial change’ if: axles and running gear have been changed to improve efficiency, safety or environmental performance
I will disagree with on thing though the "no substitute for cubes". Modern turbo engines instead of the screamers of the past seem to be transforming petrol engines into diesels. My C class makes about the same torque as the 3.5 from 1.6 litres and it does so at 1,200rpm. Let me repeat that - one thousand two hundred rpm. That's why it can pull a ninth gear of 72kph/1000rpm. (45mph - or twice that of the standard P6 4 pot).
Yes of course but a turbo quite definitely is "a substitute for cubes" in the practical sense. I can't say I like it much. I always used to buy entry level premium cars with 6 pot engines for smoothness but these are extinct now. The BMW e34 2 litre 24v six was perfect. modest power, good economy and so smooth.
Ability of an engine to tolerate extra loads of producing more power depends on how tightly it was originally specified for its planned power output. Some engines seem to have been over engineered for their original marketed output, and will readily tolerate large increases. I have a kit built 'clubbie' with an MX5 1.8L engine (1996 , 90k kms) with a turbo peaking at 7psi, produces 215hp/162kW at the wheels, limited to 7200rpm. Has been tracked a few times, never misses a beat, uses no oil. Nothing internally modified, easy normal driver. Boost comes in ~3500, but smoothly - all depends on the tuning. Bottom end must be well overspecced to handle such large increase in power. Subaru turbos run to 15psi boost, but deliver smoothly, easy drivers.
Big fan of this type of lightly boosted set up if tuned correctly.