Quote:
Originally Posted by Old Tele man
I was alluding to the fact that with the engine computer controlling the turbo waste-gate dumping of 'excess' air pressure, the engine effectively becomes a quasi-variable compression ratio device, and where "suitable grade" meant the octane value of different fuels.
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Nissan are about to release the MR20DDT Variable compression engine soon:
You're correct. All modern turbo engines use computer controlled wastegates rather than vacuum controlled wastegates to manage boost. It gives small engines more torque at low speeds because they close the wastegate and go to boost when taking off. Rather than waiting for vacuum to finish before closing the wastegate. That's most of the secret to the modern turbo engine.
Toyota are also following along with their C-HR having a 1.2T.
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
