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post #1 of 14 (permalink) Old 05-21-2019, 12:55 PM Thread Starter
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turbo turbine education

i see these ebay sellers having 76x64 and 76x67 hx40 turbine upgrades...

if the inducer on both is the same, wouldn't it be better to just go with the largest exducer for flow?

i know there's more weight on the shaft, but just wondering why to choose one over the other?

thanks.

BJ


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post #2 of 14 (permalink) Old 05-21-2019, 02:43 PM
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post #3 of 14 (permalink) Old 05-23-2019, 11:29 AM Thread Starter
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i guess everyone just jumps to a S300? :-).

thanks.

BJ

95 ECLB 4x4, DSS, HD X-over steering, auto., Hell bent 2.5" lvl, Thuren track bar, tabbed KDP, 4" MBRP, Otherwise all stock.
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post #4 of 14 (permalink) Old 05-23-2019, 01:41 PM
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There is more to flow than just the inducer/exducer sizing. The larger vs smaller depends on turbine housing sizing from a flow perspective.

Anyways, yes nobody really messes with HX40s anymore. Any of the recent S300 series surpass them in terms of efficiency.

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post #5 of 14 (permalink) Old 05-23-2019, 02:08 PM Thread Starter
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Quote:
Originally Posted by hemirunner426 View Post
There is more to flow than just the inducer/exducer sizing. The larger vs smaller depends on turbine housing sizing from a flow perspective.

Anyways, yes nobody really messes with HX40s anymore. Any of the recent S300 series surpass them in terms of efficiency.
I hear ya on the S300 as "the" go to upgrade...

the reason i ask is i have a roached out HX40 (good compressor cover) and spare WH1C...was looking to buy a complete hx40 CHRA replacement (~$200) and machine out the 12cm housing for it (~$150). small upgrade and will bolt on (i have a 4" exhaust waiting).

From looking at these parts, I wondered about the 67mm vs. 64mm exducer sizes on the turbines.

BJ

95 ECLB 4x4, DSS, HD X-over steering, auto., Hell bent 2.5" lvl, Thuren track bar, tabbed KDP, 4" MBRP, Otherwise all stock.
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post #6 of 14 (permalink) Old 05-23-2019, 10:04 PM
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I prefer the smaller turbine myself. Spools faster, but won't give you as much on the top end.
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post #7 of 14 (permalink) Old 05-25-2019, 06:07 PM
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What compressor are you running?
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post #8 of 14 (permalink) Old 05-26-2019, 08:34 AM
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One truck has a 59 65 14 and the other has a 62 65 14. The 59mm lights up quickly but doesn't hit as hard as the 62mm. Egt is under control better with the 62 as you might expect. Someone on this forum said my super b (59mm) is really only 57mm exducer, but I never measured it. I've been thinking about a k27 over a 69 something for a good towing compound setup. Won't happen for at least a year though. Going to fab all the plumbing myself. I've got no experience with larger tubines, but from what I've read, they are more for top end power. I'm waiting for others to chime in that have run a wider range of stuff than I have.
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post #9 of 14 (permalink) Old 05-28-2019, 11:52 AM Thread Starter
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Quote:
Originally Posted by Cowboy303 View Post
What compressor are you running?
not sure who that was directed to, but I am looking to run the HE351cw/HX40 60x86 compressor wheel.


BJ

95 ECLB 4x4, DSS, HD X-over steering, auto., Hell bent 2.5" lvl, Thuren track bar, tabbed KDP, 4" MBRP, Otherwise all stock.
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post #10 of 14 (permalink) Old 05-28-2019, 12:15 PM
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Subscribed. I don’t understand All these measurements/numbers beyond bigger should flow more.

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post #11 of 14 (permalink) Old 05-29-2019, 03:31 AM
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All else being equal the larger one would require slightly more flow (more RPM's) for the same pressure differential (work) across the turbine. The 64 exducer is the standard size weather it be the 12 blade turbine or the 10 blade from the super. I'm not real familiar with the hx40 and what its characteristics are for rpm range and drive pressure but if drive pressure could be a problem with the rpm you are wanting to run then the larger exducer would help a little. The 10 blade turbine should also show lower drive pressure than a 12 blade.

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post #12 of 14 (permalink) Old 05-29-2019, 03:34 AM
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pretty sure the 10 blade is the 64mm while the 12 blade is the 67. That being said, I'd run the 64mm 10 blade, it's lighter so will respond faster, and the lower blade count will help counteract the weight difference. If you were going for all out HP, then the 67mm would probably be a better bet.


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