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ECUflash 9:1 Peak Ignition Timing

Posted by GSXDNA, May 23, 2015

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  1. GSXDNA

    GSXDNA Proven Member

    242
    13
    Joined Nov 19, 2007
    Los Angeles, California
    I'm going from a stock compression 2.0L to a 2.3L .30 over 9:1. I'm curious how I can expect my peak timing to change.

    I've searched around a bit, but haven't been able to find consistent info.

    For example, if I was running 35psi (50/50 e85/91) from an hx40 on my 7.8:1 2.0 with 17* peak timing, what peak can I expect to run at 20psi on my 2.3L 9:1?

    I know there are many variables here, but I'm just looking for general guidelines for how increasing compression ratio impacts peak timing. Thanks in advance.
     

    1K  0

    1999 Mitsubishi Eclipse GSX
    · 2G DSM
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  2. 2gjlc

    2gjlc Proven Member

    91
    8
    Joined Dec 12, 2008
    29 Palms, California
    Strokers don't like as much timing. I had my car tuned at English Racing in 92 octane. I think it was like 10 degrees peak timing on my hx35 stroker with the bolt on housing. Now I'm running meth injection and about 6 psi more.
     

    Street Build 2K  10

    1998 Mitsubishi Eclipse GSX
    12.109 @ 115.36 · 2G DSM
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  3. GSXDNA

    GSXDNA Proven Member

    242
    13
    Joined Nov 19, 2007
    Los Angeles, California
    How much boost? (and did you mean 6psi more, or 6 degrees more)?
     
    Last edited: May 23, 2015

    1K  0

    1999 Mitsubishi Eclipse GSX
    · 2G DSM
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  4. 2gjlc

    2gjlc Proven Member

    91
    8
    Joined Dec 12, 2008
    29 Palms, California
    I was only able to run about 23 psi with a small spike to 25. Now I'm at 31 but it falls to 27-28 on the top end. Sorry, meant about 6 psi more.
     

    Street Build 2K  10

    1998 Mitsubishi Eclipse GSX
    12.109 @ 115.36 · 2G DSM
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  5. 2gjlc

    2gjlc Proven Member

    91
    8
    Joined Dec 12, 2008
    29 Palms, California
    I just got retuned on Tuesday. I can look at the map and see what they set timing to.
     

    Street Build 2K  10

    1998 Mitsubishi Eclipse GSX
    12.109 @ 115.36 · 2G DSM
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  6. GSXDNA

    GSXDNA Proven Member

    242
    13
    Joined Nov 19, 2007
    Los Angeles, California
    Yeah, that'd be helpful. Thanks.
     

    1K  0

    1999 Mitsubishi Eclipse GSX
    · 2G DSM
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  7. 2gjlc

    2gjlc Proven Member

    91
    8
    Joined Dec 12, 2008
    29 Palms, California
    12 degrees peak timing. This is on 92 octane with meth at about 30 psi. Tuned by Aaron at ER. Sorry about the delayed response.
     

    Street Build 2K  10

    1998 Mitsubishi Eclipse GSX
    12.109 @ 115.36 · 2G DSM
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  8. jery1234

    jery1234 Proven Member

    220
    36
    Joined Jul 26, 2008
    Toronto, ON, Canada
    2.3 10.5:1 cr 94 oct + pure meth injection @ 39psi 10* peak timing .
     

    966  0

    1991 Mitsubishi Eclipse GSX
    · 1G DSM
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