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Holset Turbos, PART 2

Posted by Morphius, Jul 24, 2005

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  1. GORBS88

    GORBS88 Proven Member

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    OK, guys i have another question. I have checked the stock housing that came with my hx-35 and it is a 12cm housing, would this be good to use rather then the .55 BEP one? Would this be to laggy? I see many guys talkin about 14-16cm housing and those are huge but since this is a small one i hope it will work.
    How would this compare to using a hx-4o with the .70 a/r housing?
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  2. ceedawg

    ceedawg Supporting Member

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    I have the turbonetics T3 mani. Just as long as I can hit full boost in the 4k range I guess I'd be happy!
     
    ceedawg

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    1995 Eagle Talon TSi AWD
    manual · 2G DSM
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  3. ceedawg

    ceedawg Supporting Member

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    For quicker spoolup I would say the .55 AR BEP hsing would be best compared to the .70 BEP and the stck 12cm hsing for the HX35 because of the size of the turbine wheel is my take.

    The 70 would flow more but would be laggier. I have a .55 BEH for the HX35 I wonder if your 12cm stck hsing could wrk on my HX40 with some machining?
     
    ceedawg

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    1995 Eagle Talon TSi AWD
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  4. GORBS88

    GORBS88 Proven Member

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    Maybe this is a better question, Has or is anyone running the 12cm housing on the hx-35? Need some input on this.





    Yes the 12cm housing can be fitted to the hx-40 with some machine work.
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  5. dsm-onster

    dsm-onster DSM Wiseman

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    Bloxom, Virginia

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  6. gixrman

    gixrman Proven Member

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    I can't remember if this was posted before but I wanted to know if the HX40 and the H1E comp. wheels were inerchangable (does'nt the 40 have like 3 different wheels anyway?). I have the H1E and I remember reading that the HX40 wheel was more efficient. Blah blah are the wheels available and were?
     

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  7. cloead

    cloead Proven Member

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    Well, just got my "recently rebuilt" hx40 in the mail, I'll keep you guys updated on how this thing does.

    Just gotta order the bullseye housing asap.

    IMAGE_095.jpg
     
  8. ceedawg

    ceedawg Supporting Member

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    Is it a divided 12cm hsing?
     
    ceedawg

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  9. GORBS88

    GORBS88 Proven Member

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    Hey, yes it is the divided housing. Is it worth using?
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  10. gixrman

    gixrman Proven Member

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    Do you have a picture of the housing? My T3 16cm divided housing is small compared to the 21cm that the H1E came with and took some decent machining to fit the larger wheel.
     

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  11. GORBS88

    GORBS88 Proven Member

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    I'm not goin to machine this one, i am using it on the hx-35 wheel.
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  12. gixrman

    gixrman Proven Member

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    Ok, you still have to send it out to get rebalanced, correct?
     

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  13. GORBS88

    GORBS88 Proven Member

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    Nope, the exhaust housing just unbolts and has nothing to do with the center cartride or the balance of the turbo.
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  14. ceedawg

    ceedawg Supporting Member

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    If your interested I'd trade you my brandnew BEP .55AR HX35 hsing for your hsing + cash if it can wrk on my HX40?
     
    ceedawg

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  15. GORBS88

    GORBS88 Proven Member

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    The housing would work but would have to be machined out to fit the bigger wheel.. I am not to sure at this point if i am goin to use it or sell it, i will let you know what i decide.
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  16. johnnyRacer

    johnnyRacer Proven Member

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    I got a hx40/bullseye, fp race manifold, and o2 wg dump. I just need to get the oil lines and restrictor.
     
  17. ceedawg

    ceedawg Supporting Member

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    Anything else to add?:confused:
     
    ceedawg

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  18. GORBS88

    GORBS88 Proven Member

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    Has anyone figured out how much the BEP housing is choking off? Some guys say lots and some guys say not, not sure what to believe. All i know is if it actually is .55A/R then it must be hurting the top end pretty good.
    As for all the talk about the actual air flow of these turbos it seems to me like it is there but at such a high presure ratio. Some guys say the hx-40 should flow 70lbs and other say no way, holset rates it around 70lbs but this is at such a high boost level knowone will reach it.
    It's not that the holsets can't flow the air it's the fact that they flow the most at something like 44psi, well that's a little high for most of us.

    Pls help me in deciding on the 12cm housing over the BEP one, don't say it's not worth it to change the manny and DP and all the stuff cause of the cost, money and time aside which is gonna make more power? and which would be a better choice?
     

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    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  19. dsm-onster

    dsm-onster DSM Wiseman

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    Th .55 ar housing "seams" to choke the hx35 up top abit. However, it is speculated that the hx35 compressor flows about as much as a 50-trim and a few have reached that flow level w/ the hx35/bep combination. But it definately does not "seam" to choke the larger hx40.
     

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  20. GORBS88

    GORBS88 Proven Member

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    So the BEP housing doesnt "seam" to choke the hx40? For what reason is that? Is the 40 BEP housing designed with a bigger A/R or is it the fact that the compressor is so big that it just doesnt affect it?
    I am in need of more power with my set-up, my mods are up to date so you can check them.
    I have 2 options

    1) Bolt on a HX 40 in the BEP housing and with that said i know guys have put down 500 to the wheels.
    2) Take off my BEP housing and use my 12cm housing on the 35 and hope for some more power.

    What sounds better? I would like around 500awhp and i think now with the 35 i am around 400awhp, but i'm just assuming by the way it pulls.
     

    695  0

    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  21. dsm-onster

    dsm-onster DSM Wiseman

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    The answer is simple for you. Can 51 lbs/min yield 500awhp? 51lbs/min is as far as a hx35 map can take you. I'd swap to the hx40/bep. It's proven to go far beyond that and spool like turbos that max out at your goal.

    A compressor cannot affect the flow of a turbine. The hx40 turbine is much bigger than an hx35. The a/r may be small, but the hole actually exiting the exhaust (turbine wheel) is bigger. The a/r of a turbine is a way of fine tuning the turbine flow. Nothing more. You can gain a little more by upping the a/r at the expense of spool.

    But, don't think that a particular a/r that works well with one turbine is not enough for another larger turbine. Don't think that an a/r that works poorly for one turbine would certainly be to small for another turbine. Look at it in percentages. Say a 1.09 a/r housing is as large as you can go on a particular turbine to yield 100% flow. That same a/r for turbine that is 25% larger (like the hx40 vs. hx35) would flow 95% of its higher potential with that same 1.09 a/r housing. 95% of the higher flowing turbine is still MUCH more than 100% of the lower flowing turbine.

    The hx40 pro compressor seams to be matched very well to the hx40 turbine in the bep housing. The pro wheel does not seam to have more flow capability than the hx40 turbine in the bep housing

    I think the notion that the bep housing is too small for the hx35 comes from supposition that the 35 should flow more than 55 lbs/min. The LARGE compressor housings can be deceiving
     

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  22. JWoodley

    JWoodley Proven Member

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    I'm in the market for a HX40 pro if anyone has one laying around.
     

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    manual · 2G DSM
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  23. aero_sallee

    aero_sallee Proven Member

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    Wichita, Kansas
    I tested my 8 blade HX40 and internally gated BEP housing with an oil pressure gauge of my dads. I got a fitting that screwed into the EGT probe hole in my 2g manifold. At 17-19lbs of boost, the exhaust pressure in the #1 runner was somewhere around 25-27lbs. That is taking the middle of the needle swing since the exhaust pulses in one runner are less than ideal for measuring pressure and the needle swings rapidly.
    Hopefully that helps someone out a little bit.
     

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    13.348 @ 104.460 · 2G DSM
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  24. GORBS88

    GORBS88 Proven Member

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    Oliver, BC, Canada
    Ok, that makes sense. Now for one more question,I know there are a few hx-40 compressor wheels and the "PRO" that guys talk about is a 6 blade? I have seen 7 and 8 blade aswell, now is there goin to be much difference in flow between these?? Do i have to get the PRO?
     

    695  0

    1992 Eagle Talon TSi AWD
    11.110 @ 132.560 · 1G DSM
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  25. joeracer321

    joeracer321 Proven Member

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    Lancaster, California
    I have one, it is a Pro HX-40 in an internally gated BEP DSM housing. This turbo on 28 PSI made 521 WHP on my 05 Evo. It was on the car about 5 months (maybe 3000 miles). But as most people know, these turbos are on trucks in the multiple hundreds of thousands of miles, so mileage is not too much of an issue with these turbos. Let me know if you are interested.
     
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