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GVR4 hx35 max Rpm ?

Posted by cptncreme, Oct 11, 2018

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  1. cptncreme

    cptncreme Probationary Member

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    Joined Feb 10, 2017
    Austin, Texas
    So I have a built 2.0 with full e85 fuel system on v3 SD. I am running fp manifold, 7 blade hx35 with bep .55 housing, 272 cams, stock intake, 2.5" intercooler piping. It's running great just thought it would pull higher up top.ax boost about 4000 Rpm, 32 psi, but power falls off pretty hard at about 6700, boost is steady though, just like it runs out of air because fuel goes rich...is this because the 55 housing??
     

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    Last edited: Oct 11, 2018

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  2. Vegas smith

    Vegas smith Proven Member

    2,113
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    Houston, Texas
    It surely isn't helping.
     
    My DSM:
    1993 Eagle Talon TSi AWD

    Street Build

    GT30   manual
    1992 Eagle Talon TSi AWD (sold)

    16g   manual
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  3. Boomdeeze

    Boomdeeze Proven Member

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    Independence, Minnesota
    Sounds like you have other contributing factors, I doubt the .55 housing is cutting airflow at 6700 rpms. Are you sure it's not in the tune where is starts to get rich? What A/F are you seeing?
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

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    10.793 @ 128.98 MPH
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  4. cptncreme

    cptncreme Probationary Member

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    Joined Feb 10, 2017
    Austin, Texas
    Ya I leaned it out some up top in the rpm range. Before I leaned it out with the SD table it was dipping into high 10's with e85 and breaking up. Going to pull some more out and see if it pulls higher. I have already done blt a few times and nothing. Running an external mvs 38mm wg.
     
  5. 19gsx91

    19gsx91 Proven Member

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    Walworth, New York
    What are you using to control boost? internally or externally gated? MBC or electronic boost controller?
     
    My DSM:
    1992 Mitsubishi Eclipse GSX

    Street Build

    292 whp   264 lb/ft
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  6. Boomdeeze

    Boomdeeze Proven Member

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    Independence, Minnesota
    Can you post a log?
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

    Street Build

    10.793 @ 128.98 MPH
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  7. OH91awd

    OH91awd Proven Member

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    chillicothe, Ohio
    the .55ar housing is a restriction on the holsets. although ive seen most people get in the 7000rpm range before power falls off. that small of a housing dont expect much more than that though.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Drag Race Build

    10.89 @ 125.67 MPH
    1991 Eagle Talon TSi AWD (sold)

    Street Build

    GT35   manual
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  8. 19gsx91

    19gsx91 Proven Member

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    I have a .55 housing on a 7 blade hx40 and boost climbs past 5k and I have to turn my duty cycles down the higher my RPM is to compensate. and that .55 housing is a choke point for my turbo, not so much on an hx35.

    I'd be willing to bet if he is internally gated and running an MBC that those two will cause issues with boost control.
     
    My DSM:
    1992 Mitsubishi Eclipse GSX

    Street Build

    292 whp   264 lb/ft
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  9. OH91awd

    OH91awd Proven Member

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    Joined Sep 22, 2011
    chillicothe, Ohio
    hes not internally gated though and hes not having boost control issues. power is falling off after 6700rpm. and yes the .55 chokes on a hx35.
     
    My DSM:
    1992 Eagle Talon TSi AWD

    Drag Race Build

    10.89 @ 125.67 MPH
    1991 Eagle Talon TSi AWD (sold)

    Street Build

    GT35   manual
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    19gsx91 likes this.
  10. cptncreme

    cptncreme Probationary Member

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    Joined Feb 10, 2017
    Austin, Texas
    Ya I'm not having boost issues, it holds 31-32 psi all the way through the pull. External mvs gate and manual boost controller
     
    19gsx91 likes this.
  11. 19gsx91

    19gsx91 Proven Member

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    Walworth, New York
    "but power falls off pretty hard at about 6700, boost is steady though, just like it runs out of air because fuel goes rich...is this because the 55 housing??"

    Sorry, at work. Missed the boost being steady part and the external. That's odd then. I've had zero issues with my setup and between the two of us a 7 blade 40 should have a much more significant choke than a 35. I don't think that's to blame.
     
    My DSM:
    1992 Mitsubishi Eclipse GSX

    Street Build

    292 whp   264 lb/ft
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  12. spyve4

    spyve4 Probationary Member

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    Joined Apr 19, 2009
    St. Augustine, Florida
    Bov leak= rich condition?
     
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    Street Build

    20g   manual
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  13. donniekak

    donniekak DSM Wiseman

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    Joined Mar 23, 2008
    Surprise, Arizona
    The hx40 works better in the small housing because the turbine is so much bigger.

    The only bolt on housing I’ve used, (and I’ve used them all) that works like a similar size t3 or t4 housing is the fp30 hotside. Even the 8cm housings the red and black come in are a joke.
     
    My DSM:
    1991 Eagle Talon TSi AWD

    Street Build

      manual
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    OH91awd likes this.
  14. cptncreme

    cptncreme Probationary Member

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    Joined Feb 10, 2017
    Austin, Texas
    I dunno about that, but not losing boost. Brand new real HKS ssq
     

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