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What turbo for high compression??

Posted by jayson427, Sep 4, 2012

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  1. boosted99_420

    boosted99_420 Proven Member

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    Joined Apr 26, 2010
    Fort Carson, Colorado
    What rods are you using is another question. The 420a rods are pretty weak and with high compression its gonna make power very easily but also starin the rods more.
     
  2. dsmcrzy

    dsmcrzy Proven Member

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    Trenton, Ohio
    If the OP has 10.5:1 pistons then he has aftermarket rods. You dont want to hang Wiseco or JE full floating pistons on a press fit rod.

    OP like I posted before and a few others have touched on look into a water/meth system it will benefit you now being N/A with the correct nozzle and a quick nozzle change when you go turbo. This will give you some more 'wiggle room' in your tune.

    When I got turbo I plan to run one nozzle pre turbo the one nozzle pre throttle body/ post Intercooler.

    Take a look at Devils own methanol they have a lot of info on their site.
     

    Street Build 4K  12

    1996 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  3. jayson427

    jayson427 Proven Member

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    Mesa, Arizona
    thanks man ill look into it. and yeah i have eagle rods LOL only thing stock in my motor is the crank.
     

    1K  0

    1996 Mitsubishi Eclipse N/T
    manual · 2G DSM
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  4. jayson427

    jayson427 Proven Member

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    Mesa, Arizona
    now i think about it im not sure there is methanol in my town only e85?
     

    1K  0

    1996 Mitsubishi Eclipse N/T
    manual · 2G DSM
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  5. Josh97eclipse

    Josh97eclipse Proven Member

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    Joined Feb 14, 2011
    N. Ridgeville, Ohio
    Zacs car doesnt run :p I forgot what I rid in his thread but I think he spun a bearing. But from what I heard his high comp turbo ran awesome with MS.
     

    556  0

    1997 Mitsubishi Eclipse N/T
    · 2G DSM
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  6. dsmcrzy

    dsmcrzy Proven Member

    1,140
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    Joined Dec 20, 2009
    Trenton, Ohio
    For water/meth injection you can use the blue windshield washer fluid that's good for -20 degrees. I think you will find plenty of that around town :thumb:
     

    Street Build 4K  12

    1996 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  7. glowryder

    glowryder Proven Member

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    Joined Jan 23, 2004
    des moines, Iowa
    IMO, go with a middle ground of 9.x:1. Still higher CR then typical setups, but you still have a little bit wider of a window. I have to agree the 20G is an excellent turbo. But alot is in the tune as well, if you lean out the low boost, you can get spool to higher boost quicker, theres always tricks (regardless of CR). I dont disagree that High CR + boost is more effiecent, the motor works more. I would say a mid CR engien will get a little of the Pros from both sides. Hell 300 on a 8.5:1 motor isnt really that hard either..yes it takes more, but in the large scheme, not that much more. If your dead set on runing the 10.5, then go with a 16 or 20g as you wont be using the high boost areas of that turbo anyway. Hope you can tune ;)
     
  8. jayson427

    jayson427 Proven Member

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    Mesa, Arizona
    I already have my motor built and in my car it has 4500 miles on it so yeah im dead set on high cr since its what I'm working with. I live outside of vegas so I would have a shop tune it of course.
     

    1K  0

    1996 Mitsubishi Eclipse N/T
    manual · 2G DSM
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  9. glowryder

    glowryder Proven Member

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    Joined Jan 23, 2004
    des moines, Iowa
    So go 20G.
     
  10. Clutch450

    Clutch450 Proven Member

    231
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    Joined Jan 15, 2009
    Lancaster, Pennsylvania
    If your town has E85 then run that. Amazing stuff!
    It will give you a much better margin to tune with.
    E85 and 20g or HX35 gets my vote!
     

    824  0

    1999 Mitsubishi Eclipse GSX
    11.244 @ 131.810 · 2G DSM
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  11. glowryder

    glowryder Proven Member

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    Joined Jan 23, 2004
    des moines, Iowa
    Hes may to have to run differnt fuel mods to support that..
     
  12. LD25Delta9

    LD25Delta9 Proven Member

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    Joined Feb 12, 2008
    Ft. Wayne, Indiana
    This would have been my suggestion right from the get go. E85 will give you much greater room for error.

    As per the OP's original question, get a gtr30. That frame garrett plus e-85 can put you closer to 400whp easy.
     

    725  0

    1997 Eagle Talon N/T
    manual · 2G DSM
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  13. Clutch450

    Clutch450 Proven Member

    231
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    Joined Jan 15, 2009
    Lancaster, Pennsylvania
    Even if the OP has to change a few things around with his fuel setup it is worth it in the long run.
    You dont take near the chance of getting knock with E85 as you would on 91-93.
    Spend $500 now to save yourself thousands if you blow a motor...
    Just my opinion though
     

    824  0

    1999 Mitsubishi Eclipse GSX
    11.244 @ 131.810 · 2G DSM
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  14. Slo2gen

    Slo2gen Proven Member

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    Joined Apr 26, 2005
    Spartanburg, South Carolina
    My car ran great, it broke an oil pump ring gear in 3 spots on the Dyno. Freak accident or a bad one put of the box. I was running E85. I have a build thread on it somewhere. Now going 2.4 and totally different set up.
     

    2K  0

    1998 Mitsubishi Eclipse N/T
    420 whp · 365.0 lb/ft · 2G DSM
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  15. JusMX141

    JusMX141 Moderator

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    Joined Dec 13, 2005
    Greensburg, Pennsylvania
    Something with a larger turbine wheel or higher a/r number on the turbine housing to deal with the additional amount of exhaust energy. A small turbine or small a/r housing will funnel the exhaust energy into too small of a space, raising backpressure and EGT's which are NOT what you'll want to be dealing with on a high-compression application.

    Some guys have said a 50-trim, and that would be fine as well....but if it were possible to still get this built, I'd say use something like a 60-1 compressor with a T350 turbine wheel in .63 a/r T3 housing. PTE used to call that wheel combo a SC6052E. That should give you an easy 300whp at just 15psi or so, while reaching full boost in the 4200-4300rpm range and remaining very easy to tune on pump fuel.
     

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    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

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    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

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    1992 Eagle Talon TSi
    manual · 1G DSM

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    1993 Eagle Talon TSi AWD
    manual · 1G DSM
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