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Posted by Tymort, Jan 2, 2020

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  1. Tymort

    Tymort Probationary Member

    Joined Jan 2, 2020
    Kenosha, Wisconsin
    I know that this has been discussed repeatedly, but I seem to find contradicting points of views all over. I currently have a great condition HX35 8 blade, and have an opportunity to buy a 7 blade. I would simply like to know which will perform better on the street(spools quicker, etc.), around 350-400hp. Thank you!
  2. llxkevinxll

    llxkevinxll Proven Member

    Joined Jan 29, 2012
    Cleveland, Ohio
    I copied and pasted the below from the main Holset thread on this forum. Note the comment near the bottom regarding spool.



    The 8blade hx35 has a 56mm compressor inducer. This is found on 1995-1998 cummins manual pickups. The compressor flows 52 lb/min according to the compressor map. The bolton BEP housing (0.55 a/r) is enough to push the limit of the compressor. There's several 500whp 8blade hx35 cars out there with the bolt on housing. It reaches 20+psi by 3500rpms in 3rd with 272 cams. Smaller cams would equal a faster spool speed in most cases.

    The 7blade hx35 has a 54mm compressor inducer. This is found on the 1999-2002 cummins manual pickups. The compressor flows 60lb/min according to the compressor map and logged results from a member here. The bolton BEP housing with the hx35 turbine wheel do not SEEM to have enough flow to really reach the potential of 60lb/min. But many have logged over 50lb/min so far and seen 500whp. The stock hx35 12cm^2 twinscroll turbine housing is a t3 flange housing. This mated to a NON-divided runner manifold has produced a 132mph trap speed with a full weight 1g AWD. This is about 600whp. So the flow is there with the stock housing if you use a non-divided manifold. The spool speed of the 7blade hx35 is similar to the 8blade hx35 with 20+ psi by 3500rpms in the bolton housing and by 4000rpms with the stock housing with a non-divided manifold."

    89  1

    1997 Chevy S-10
    rwd · automatic · Misc Vehicles

    Autocross Build 3K  4

    1996 Eagle Talon TSi AWD
    11.90 @ 124.05 · 2G DSM

    Street Build 1K  1

    1992 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM
    GST with PSI and Tymort like this.
  3. gsmokez

    gsmokez Proven Member

    Joined Mar 30, 2009
    Brampton, ON, Canada
    I can't say I've tried the 8 blade but the 7 blade is great on the street, especially with a twin scroll setup.

    782  5

    1997 Mitsubishi Eclipse Spyder GST
    awd · manual · 2G DSM

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