Some info on Holset turbos...

[davisranso]

Still in the process of shopping for a new turbo, I found this info about the Holset Hx-35/40 hybrid( I also found compressor maps for the Hx-40's if anyone's interested)...

Compressor
2.362 inducer
3.328 exducer

Turbine
2.753 inducer
2.364 exducer

Here is the specs on a straight Hx-40...

HX-40

Compressor
2.362 inducer
3.328 exducer

Turbine
2.995 inducer
2.480 exducer

Here are some specs from a Precision Sc6152 rated at 630hp...

Compressor
2.416"ind.
3.227"exd.

T350 Turbine (Stg 5)
2.920"ind.
2.420"exd.

Basically, the compressor is slightly bigger than a 60-1 but slightly smaller than the 61mm (gt35,t-61,sc61 etc.) but of course includes the Map width enhancement grooves in the compressor wheel supposedly making it about 10% more efficient than a compressor of similiar size. The Hx-35 turbine wheel is bigger than a stg 3 wheel but smaller than a stg 5, I guess a perfect stg "4" if there ever was such. The Hx-40 turbine wheel is bigger than a stg 5, and also slightly bigger than a p-trim.

Basically with all this being known, I would say the Hx-35/40 is a very attractive alternative to the 60-1, gt35 family, or anything else that uses the 61mm compressor. I would probably rate it's max potential between 620-660hp. The Hx-40 on the other hand I'm now thoroughly convinced it CAN achieve up to 700hp, but nothing more.

Basically...I've pretty much made up my mind that an Hx-35/40 hybrid is going to be my next turbo Pretty sweet considering they go for $799 brand new.

Oh yeah...I hope this actually potentially helped somebody :lol:

[Jason84NA2T]

Thanks, this is very useful information for comparison. Please post up the compressor map, I would like to see it. In fact, can you re-post this whole thing in the holset turbo faq thread for archival purposes?

It does not suprise me that the HX40 is larger than a p trim based just on comparable spoolup RPM, but the HX35 turbine being larger than stage 3 is interesting (though really better matched to the HX35 compressor than a stg3/60-1 is) because spoolup seems to be almost identical between the two.

Go figure, Holsets are actually Garrett clones at heart anyway.

[davisranso]

The Hx-40 maps I found were in a thread on the dsmtuner forum. I tried saving them but for some reason they got cut in half...so I'll just post the direct link.


http://www.dsmtuners.com/forums/showthr ... 083&page=5


Just look towards the bottom half of the page, there's 3 of them there. One is the 58mm 8 bladed compressor, another is the 7 bladed 60mm, and the other is the 6 bladed 60mm which is the highest flowing wheel.

Of course, another reason why Holsets are good choices for our cars is the divided turbine housings they have, which of course we have divided manifolds. A natural fit obviously, but that's one reason why they spool so fast. That's another reason why I'm starting to believe the Hx-35/40 hyrbid is one of the best turbos for our car period. It's just almost the perfect street/medium power turbo with the 12cm housing.

Based on the research I've done, (I hope I'm not sounding too fanboyish) but I think it's superior in every way to the 60-1 and the 61mm family.

[davisranso]

Also while on the topic, Hx-35's have two different compressor wheels...a 54mm and a 56mm. The smaller of the two probably flows slightly less than a 60-1 but the 56mm is either on par or slightly more efficient than the 60-1. The turbine wheels are all the same size, which is again roughly about a stg "4" i guess we could say. Pretty much this just reaffirms the fact that Hx-35's in either trim are cheaper and better alternatives to 60-1's.

As far as H1e's and WH1e's go...like the Hx40's that came after them, they also used the 58mm 8 bladed wheel, and the 60mm 7 bladed wheel. The H1e family also used the same turbines as the Hx-40, but also used many more sizes as well, plus they had many different turbine housing configurations. The most notable difference between the H1e family and the Hx-40's is the H1e's lack of map width enhancement, supposedly making them about 10% less efficient. The easiest way to look at an H1e is like a full T4 60-1. They all are t4 flanged with relatively large turbine housings and turbines, and run compressors very similiar to 60-1's. Your average H1e has a smaller, less efficient compressor than an Hx-40, but in most cases a larger turbine and turbine housing.

Another thing I've discovered is that it's not too hard to make a holset hybrid. Pretty much most Holsets from the H1c's and up have a 4 bolt pattern that connects from the turbine housing to the center section, meaning it's cake to swap to another (ie smaller) turbine housing. Also, after speaking with a few reputable diesel shops, most of the turbine wheels are very to swap onto other turbos. Why nobody has really explored making hybrids out of Holsets is weird, but it's not as hard as others have made it out to be. Pretty much any turbine and turbine housing from the H1c's to the H1e's and Hx35's to the Hx-40's can be interchanged. As far as the larger framed Holsets like the Hx-50's and up, I'm not sure on those yet...but everything else goes.

[wilson101]

great info im looking to grab a holset when i get the money.

[enjoyrth]

Yep, i am using a turbine housing off of a WH1C on my hx35. It is the same size (12cm) but has the mounts for the internal wastegate on it, instead of on the compressor housing like the HX35 that I got (wouldn't work once I clocked it).

[davisranso]

Here are some more compressor sizes for various holsets...

H1c- 45.8mm 49.7mm 53.9mm

H1e- 48mm, 52mm, 53.9mm, 56mm, 58mm, 60mm, 63mm (yes they made a 63mm compressor!! p/n-3599642)

Hx-35- 50mm, 53.8mm

Hx-40- 59.9mm

What's cool is the exducer sizes between most of these various compressors is almost always 83mm

[JK]

For what its worth, a good friend of mine that owns a turbo shop claims the holset will take much more abuse than a Garrett of similar size and characteristics. He also suggested looking into a S 300 Switzer (Borg Warner). His claim was that the S 300 may be a better fit for the Z31. I have not looked into this, as I have gone the Holset route.

[davisranso]

More info, snatch from another board...


Model Compressor Turbine
Holset H1D 1.85 2.165
Holset H1D 1.969 2.165
Holset H1D/E 1.969 2.165
Holset H1D/E 2.047 2.165
Holset H1D/E 2.126 2.165
Holset H1C/E 2.126 2.244
Holset H1C/E 2.283 2.244
Holset H1C/E 2.126 2.362
Holset H1E 2.205 2.362
Holset H1E 2.283 2.362
TS04 2.300 3.304
60-1 2.324 3.000
Holset H1E 2.362 2.559
Holset HX40 2.362 2.559
T-61 2.382 3.544
62-1 2.441 3.000
Holset HX50 2.48 2.835
T-64 2.490 3.670
T-66 2.580 3.584
Holset HX50 2.638 3.031
Holset HX55 2.638 3.031
T-70 2.720 3.850
Holset HX55 2.835 3.031
T-72 2.840 4.030
T-76 3.020 4.030


Turbo CFM Racing HP Daily HP
HX35 600 420 330
HX40 800 560 440
T66 800 560 440
B1 900 630 495
H2E 1000 700 550
HX50 1000 700 550
HX55 1050 735 578
HT3B 1100 770 605
T76 1350 945 743
HT60 1400 980 770
B2 1500 1050 825
HX60 1550 1085 853
T88 1450-1750 1015-1225 798-963
HT4B 1800 1260 990
Big Brother 1900 1330 1045
T91 2000 1400 1100
HC5A/HX82 2450 1715 1348
T100 2600 1820 1430
T105 2900 2030 1595