Quote:
Originally Posted by TurnOne
Adding a turbo would only add power, and any theoretical gains would be wiped out as soon as you boost one time more than you expected.
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Turbochargers increase the overall thermal efficiency of the engine.
What that actually means is technical and debatable.
Without changing the AFR you won't be getting better fuel consumption, that's agreed.
There's two interesting aspects of turbo's. The first is running speed. If you are in Europe and you want to drive 130kmh everywhere then a turbo engine is your friend.
The other aspect is with Turbo-Diesels.
Every Diesel engine is made more efficient by having a turbocharger.
The main issue with turbocharging on petrol engines is probably the thermal management. I wouldn't say I'm an expert. VW have lots of engineers that really seem to have cracked the fuel efficiency thing in an admirable way.
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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
