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loss in compression = loss in how much hp?

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Old Jan 27, 2003 | 08:05 PM
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Default loss in compression = loss in how much hp?

i was wondering with say a stock 170hp usdm b18c1, how much horsepower would you lose by putting in lower compression pistons (for turbo). Say bumping the compression down to 9.0 or 8.5. Any feedback would be appreciated.
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Old Jan 28, 2003 | 03:47 AM
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You usually lose 10-12hp per .5 compression lowered.
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Old Jan 28, 2003 | 04:42 AM
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You put in lower-compression pistons so you can turn up the boost and make more power sooner, right?
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Old Jan 28, 2003 | 07:08 AM
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Originally posted by Slow-N-Low
You put in lower-compression pistons so you can turn up the boost and make more power sooner, right?
Depending on the turbo you wouldn't make power sooner, but you would make more overall from higher boost, sacrificing low RPM power.
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