Compression and boost

Syed Shah · 15th January 2004, 05:41 PM

In the 'piston' thread, Nathan mentioned TODA pistons having a very low compression ratio of 7:1. Hence being ideal for a mega-boost project only.

This got me thinking, what is better: Compression or boost.

On a turboed engine,

More compression gives better spool and more power. The downside is that at a given level of boost, better fuel must be run to avoid detonation. Yes?

More boost means more power, but high boost cannot be run without low compression, otherwise det will occur easily. Yes?

My question is, would it be better to run say (random figs for example) 35psi and 8.5:1 compression or 30psi and 9.5:1 compression?

Thanks

15th January 2004, 05:41 PM	#1
Syed Shah Member Join Date: Sep 2003 Location: Milton Keynes Posts: 192	In the 'piston' thread, Nathan mentioned TODA pistons having a very low compression ratio of 7:1. Hence being ideal for a mega-boost project only. This got me thinking, what is better: Compression or boost. On a turboed engine, More compression gives better spool and more power. The downside is that at a given level of boost, better fuel must be run to avoid detonation. Yes? More boost means more power, but high boost cannot be run without low compression, otherwise det will occur easily. Yes? My question is, would it be better to run say (random figs for example) 35psi and 8.5:1 compression or 30psi and 9.5:1 compression? Thanks __________________ UK 6sp BPU J-spec NA R6 rip Soarer TT

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