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9.0-1 or 9.5-1

Discussion in 'Forced Induction' started by bnznrc, Aug 27, 2004.

  1. bnznrc

    bnznrc Junior Member

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    im trying to decide on which compression ration to use on my engine build
    i what to run about 13-14 psi.
     
  2. hybrid89

    hybrid89 thistownsucks...

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    the lower the compression is while under boost, the easier to tune, but you yeild less horsepower due to overall lower compression. The higher will give you more HP the the lower, but is harder to tune. the difference between 9.0 ans 9.5 as far as tuning is minimal. I say go 9.5

    matt
     
  3. bnznrc

    bnznrc Junior Member

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    thanks any info is greatly appreciated
     
  4. NotUrAverage_Si

    NotUrAverage_Si Senior Member

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    9.0:1 to 9.5:1 compression ratios seem to be about the norm with most people running turbo hondas/acuras. Some go with higher c/r's but as Matt already stated it will easier to tune a turbo car with a lower c/r as opposed to one with a high c/r.
     
  5. pissedoffsol

    pissedoffsol RETIRED

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    psi is meaningless.

    the real question here is what do you plan to use?

    you're going over 11 psi, so that means you need a 3-bar map.
    3-bar map = hondata time.

    so, assumign you are running hondata,
    there's no reason not to run the 9.5:1

    i have 9:1's, and i wish i stuck with 9.8:1
     
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