Is Boost Better or Timing Better? - Page 2

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  1. #16
    Senior Member Array Towelly's Avatar
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    What kind of consistency are you seeing?

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  3. #17

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    I've been seeing anywhere from 80 to 90% alcohol content here in NorthEast Indiana.

  4. #18
    Premium Member Array black2003cobra's Avatar
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    As we all know, boost increases the amount (mass) of air ingested, which means the engine can burn more fuel. Increasing spark timing further towards MBTT on the other hand, improves the so-called, thermal-conversion efficiency of the motor, (which is defined as the amount of work done over the cycle divided by the heat input from the fuel. Don't let anyone tell you that increasing timing closer to MBTT reduces efficiency, BTW. Yes...I've seen it posted.) As a general rule, the energy released by simply burning more fuel is going to "win" over efficiency gains from improved timing, at a given knock limit. That's why one can still make more power by increasing boost, while pulling timing at the same time. Just thought I'd add my thoughts.

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