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high boost or high compresion

Discussion in 'Forced Induction' started by socalcivic, Sep 30, 2003.

  1. socalcivic

    socalcivic Junior Member

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    I have a b18b and im wondering if theres a diffrence if I lower the compression and then boost it too 19 psi, or to raise compression and set boost at 6-8psi? Im gonna use a turbo from an evo8, with a fmic which one will make more hp, im planning to put a b16 head on in the future but first i wanna boost thanks

    alex
     
  2. NoJokE

    NoJokE Senior Member

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    Its all about tuning and adding fuel/timing, etc. You can use 10:1 compression and boost a bar, just gotta get it tuned.
     
  3. jamesA

    jamesA Well known pissed off telephone guy VIP

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    :werd:

    lower compression will help because it won't ping, but that's only if you don't have the timing and air/fuel tuned right.

    you can boost high levels on high compression, it just takes a bit more patience, time and money.
     
  4. liquid00meth

    liquid00meth Senior Member

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    eventually the limit of boost vs. compression is determined by the octane gas you are running.
     
  5. NoJokE

    NoJokE Senior Member

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  6. pissedoffsol

    pissedoffsol RETIRED

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  7. socalcivic

    socalcivic Junior Member

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    thank you thank you.... I think the turbo is a 20g, is that a good turbo for my application


    alex
     
  8. calvin

    calvin Senior Member

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  9. liquid00meth

    liquid00meth Senior Member

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    the 20g turbo is a nice small turbo, it will spool extremely fast, and give a nice boost in power. I would guesstimate it's good for like 225whp at max efficiency? I am unsure of that though.
     
  10. SolReaver

    SolReaver Senior Member

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    :bash:


    20g supports wayyyyyyyyyyyyy more than 225 whp...225 whp is more like the 15g...20g is a kickass turbo and id rock it to 330-350 whp


    in size its roughly comparable to the garrett t3/t04e
     
  11. cws13

    cws13 Senior Member

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  12. K2e2vin

    K2e2vin Senior Member

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    how do you guys rate turbos on how much power it can handle?

    there are some cars running high compression(about 10:1) and high boost(about 25psi) with regular 93 octane fuel. So i guess its all in tuning. I think those water injection systems would help in these kinds of situations.
     
  13. pissedoffsol

    pissedoffsol RETIRED

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    I'm sorry, but I don't feel 10:1 is high at all. Its a medium level if you ask me.
    9:1 is low
    10:1 is average
    11:1 is moderately high
    12:1 is stupid high.

    Also, it is doubtful that you will ever see 25 psi on pump gas.... unless its a 14b tweaked to actualyl hit 25 psi...
    around 350 whp, regardless of the turbo, higher octane is needed, or a weak ass timing tune, wich eats power.

    IMO, water injection is over-rated so long as you have a proper intercooler.
     
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