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[quote][i]Algselt postitas: Maku[/i] [url=https://www.s2forum.com/forum/technical/engine-and-turbo/68273-ideal-compression-ratio-350-to-500bhp]Ideal Compression Ratio - 350 to 500bhp[/url] [i]driftin jo S2Forum Fiend Join Date: Sep 2007 Posts: 2206 Country: United Kingdom #8 28th July 2013, 11:36 Lower compression makes bad throttle response is a myth, the only reason for higher compression in a turbo engine is for fuel economy as prj pointed out above. When cruising your effective compression is much lower than WOT and this combined with low compression of say 8:1 will lower you mpg. There is virtually no loss of power running 8:1 at WOT, what you loose from compression you can gain in timing. Don't get confused with NA engines, they need a higher compression ratio to make power, especially up the rev range, turbo engines get all the compression they need,(and some they don't) once on boost. The first turbo car I ever messed with was the first Audi turbo, it had 7:1 compression ratio and no ECU at all. Timing was done mechanically by the distributor, (vac advance, boost retard). It did have lag but this was because it had a k26, I changed the k26 for a k24 off a later 200 turbo and the lag was gone, throttle response was as good as an S2! Remember the old F1 turbo cars ? They ran 6:1 compression ratio !! With today's crap petrol I would go for 8:1 if you want 500 HP as it will be so much easier for someone to tune it and much less stress on the engine. As it's an S2, fuel economy is not really an issue as it is **** anyway, if it is an issue, sell it and buy a diesel![/i] [/quote]
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Eesti Audi Klubi foorum
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