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Old 06-19-2010, 07:16 AM   #1
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Default Holset Turbos?

Picked up this info over at DSMtuners.com, I found that some of these SOUND LIKE they could be used for some of the nicely built turbo engines on here? Good power turbos for good prices...not sure of the A/R's of these turbos or trims if anybody could translate for the less educated turbo minds out that would be awesome. Im particularly interested in this "HY35" if anybody would care to crunch some numbers and get some usable noob info about it? I would definitely read these, if the claims are true these things sound pretty interesting!

HX35:

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 56mm 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 SEAM 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.

HY35:

The hy35 has a smaller turbine wheel than the hx35. And, it has a turbine housing connection that does not allow for a bolton housing to be used. It does not have a divided housing so any t3 manifold can be used effectively with this turbo. It has the same compressor as the 7blade hx35. We don't know if te hy35 turbine wheel and housing is enough to reache the 60lb/min potential of the 56mm 7blade compressor. Some one try it out already!!! It should at least be a faster spooling viable option to the full t3/t4 50-trim.


H1C/WH1C:

In 1994, there was the Wh1c which has pretty much the identical compressor as the hx35 but with a Vband compressor cover. The turbine wheel is the same. It will bolt into the BEP bolton hx35 turbine housing. It has 4 bolts at the housing instead of 6. So you will need to buy 2 more bolts and use 6 washers cut to make a flat side. Honestly, I just used bolts that were cut a little short and the bolt head was wide enough to pull the chra to the turbine housing. No sealing issues. Since the Wh1c is for all practical purposes an 8blade hx35 the spool and flow is the same too.

I have the big h1c. It comes on the INTERCOOLED 1991-1993 cummins pickups. It has the webbing for MWE but no groove cut like the hx35/wh1c has. This turbo I term the big h1c because it has a 54mm compressor inducer and same exducer than the 8blade hx35/Wh1c. The other h1c is the small h1c found on the NON-intercooled cummins pickups. This has a 50mm inducer but only 7blades and has no webbing for MWE. Less blades helps flow, but so does a larger inducer diameter. The most whp ever recorded on a gas 4cylinder with the small h1c was done on a KA24 nissan: 411whp. Since the big h1c has a 4mm larger inducer and the same turbine wheel as the hx35, it is safe to say that it flows enough for between 411whp and 500whp. The diesel sources state that it flows SLIGHTLY less than the early hx35. So 4lb/min less than the 8blade hx35 puts the flow of the big h1c at 48-49lb/min right where a 50-trim or 20g is. The small bep housing is all that's needed to get the most from the compressor and the spool speed is 20+psi by 3500rpms.

HX35-40 hybrid:

Keeping the long tradition of the marriage of sportcompact and hybrid turbos, there is the hx35 turbine and the hx40 compressor. It is strongly recommended to use the large bep turbine housing or the stock hx35 turbine housing with an non-divided t3 manifold for this turbo. The small bep housing around a t31 size hx35 turbine wheel is probably not enough to merit any of the hx40 compressor wheel upgrades. 20+ psi by 4000rpms can be seen in the hx35/40 with the hx35 12cm^2 turbine housing with a non-divided t3 manifold. With the large bep housing, spool times are to be determined. But likely similar.

HX40:

The 8blade hx40 has a 58mm inducer and flows about the same as a 60-1 (around 60lb/min) with ALOT better high boost efficiency and spool speed. It is the most common hx40 out there. The small bep housing with the hx40 turbine wheel is plenty to reach the full potential of the 60lb/min 8blade hx40 compressor. 20+ psi by 4100rpms with 272s.

The 7 and 6 blade hx40 is called the super40 and has the 60mm compressor inducer. This compressor flows around 69lb/min. You can get this wheel in billet style (think HTA). The non-billet wheel spools as fast as the 8blade hx40 in the bolton bep housing and has done 653whp at 40psi per the holset results only thread. Billet should spool even faster. The t3 .70 a/r BEP housing slows spool about 400rpms. But reports show a significant gain in flow per psi. So expect more power at lower boost with that turbine housing.

H1E/WH1E:

The Wh1e is like it's little brother the Wh1c. It mirrors the hx40 8blade in every way except that it has a v-band compressor cover and a 4bolt chra-turbinehousing pattern. It will consequently bolt into the hx40 bep bolton turbine housing and this is plenty of flow to max out its 60lb/min compressor.

The h1e is like it's little brother the h1c. There are different size compressors. . . BUT there are also different size turbine wheels too. Check measurements before buying this turbo if you plan on running a BEP turbine housing. There are lower flowing compressors than the 58mm 8blade that are out there. So this turbo may not flow any more than an hx35 if get the wrong one. You need at least a 58mm compressor inducer for this to be a worthwhile turbo vs the proven hx35 or 8blade hx40.

HX52:

This is a big sucker. It is commonly found on the Volvo Semis and usually has a billet compressor wheel. It flows 88lb/min. There is no bolt on housing for it. If you want a bolton housing for this turbo, then you don't want this turbo. In fact if you want a t3 flange turbine housing for this turbo, then you don't want this turbo. You DO want this turbo if you're looking at a gt4294r or gt4202r. The turbine inlet is slightly different than a t4 bolt pattern. You can still get the t4 manifold to work just fine by enlarging the bolt holes.

Misc.:

Holset's don't spool slow. They spool faster than their garrett or mitsubishi counterparts. Diesel exhaust is cold and slow moving.

The holset turbine wheel is a work of art. It has been shown to flow very well in a very small turbine housing. For example the hx40 turbine wheel in the small .55 ar bep bolton housing flows as much as a garrett gt35r turbine wheel in a larger .63 ar garrett t3 turbine housing. The hx40 with this configuration spools about 500rpms faster! You can upgrade to the .70 a/r BEP t3 turbine housing and have the same or slightly faster spool speed as the above gt35r with ALOT more flow per psi and consequently more horsepower per psi. This makes for VERY good pumpgas numbers.

Holset patented map width enhancement. They do not have extended tip technology, but there compressors show more efficiency than their garrett or mitsubishi counterpart.

They have superback technology witch leads to VERY, VERY durable compressors. The are designed to be overworked and underpaid.

There are discrepancies all over the web concerning the compressor maps. Take what you hear/read with a grain of salt and a shot of tequila, and the worm.

The holset is fine with stock 4g63 oil pressure from the oil filter housing. If you have no b shafts, you'll need a restrictor. The drain line is a garret bolt pattern. The feed line is different for different turbos.

Last edited by na8psi; 06-19-2010 at 09:10 AM.
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Old 06-19-2010, 09:56 AM   #2
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Great turbos. HY or the HE would be appropriate for most of ours. If reving out and higher power goals... HX35
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Old 06-19-2010, 02:41 PM   #3
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I highly recommend them. All my E30 buddies run them(and only them actually) and beat the **** out of these turbo's on a daily basis. DeadNutz realiable and make great power.

HX30 on a miata sounds like alot of fun, but i'm actually on the lookout for the mysterious HX27...
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Old 06-19-2010, 02:56 PM   #4
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im looking at them on ebay, what's with all the electronic stuff on them?
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Old 06-19-2010, 05:14 PM   #5
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Got an HY35, next yr when I finish school it will be on my fe3. Sold my 2871 for $800 after one yr of use, bought the hy35 for $100 lol
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Old 06-19-2010, 05:36 PM   #6
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curious as to how these things will spool on our motors 1.6 and 1.8s?

As you can see in the informational write up above, they are seeing 20+psi at 3k!!!!
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Old 06-19-2010, 05:39 PM   #7
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Quote:
Originally Posted by na8psi View Post
curious as to how these things will spool on our motors 1.6 and 1.8s?

As you can see in the informational write up above, they are seeing 20+psi at 3k!!!!
I seriously doubt you'll see spool like that on our engines without ALOT of headwork/cams/tuning etc... They are not small turbos.

BUT, they are TANKS and are really cheap for their potential. That 100buck HY dc2696 got is a STEAL of a deal.

I'll be using one on a build of mine.... but it isn't being paired with a mazda motor
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Old 06-19-2010, 05:42 PM   #8
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I wonder what turbo is similar in characteristics/spool time/ power output that we would know of on here? I searched for about 2 hours last night for the hy35 and couldn't really find **** at all...everything was about hx35/40 hybrid.
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Old 06-19-2010, 06:08 PM   #9
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Quote:
Originally Posted by na8psi View Post
I wonder what turbo is similar in characteristics/spool time/ power output that we would know of on here? I searched for about 2 hours last night for the hy35 and couldn't really find **** at all...everything was about hx35/40 hybrid.
Send Gotpsi? a PM. He is running the Hy and should be able to answer a few questions.

EDIT: Read This
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Old 06-19-2010, 06:10 PM   #10
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Quote:
Originally Posted by viperormiata View Post
Send Gotpsi? a PM.
I assume he is running a Holset?
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Old 06-19-2010, 06:12 PM   #11
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HY and HE are basically HX35ws with a smaller turbine housing.

Thats the simplest way to compare them...
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Old 06-19-2010, 06:12 PM   #12
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Quote:
Originally Posted by na8psi View Post
I assume he is running a Holset?
I edited my last post. Check out the link.
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Old 06-19-2010, 06:25 PM   #13
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Quote:
Originally Posted by viperormiata View Post
I edited my last post. Check out the link.
Wow, thats quite a turbo there....
Some claim that Holsets spool faster then their Garrett and Mitsu counterparts? Think there is any merit to this? Aren't all the Holset's billet compressor wheels and journal bearing?
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Old 06-19-2010, 06:38 PM   #14
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Quote:
Originally Posted by Splitime View Post
I seriously doubt you'll see spool like that on our engines without ALOT of headwork/cams/tuning etc... They are not small turbos.

BUT, they are TANKS and are really cheap for their potential. That 100buck HY dc2696 got is a STEAL of a deal.

I'll be using one on a build of mine.... but it isn't being paired with a mazda motor
Ya theres no way your going to get 20psi on a hy on a stock head ect. by 3k, let alone 4k.

My 2871 would do 21 by 4k no problem and its alot smaller than the HY on the turbine side.

Ya 100bux I was laughing when i bought it from a diesel guy, he called it tiny and useless.

Quote:
Originally Posted by na8psi View Post
Wow, thats quite a turbo there....
Aren't all the Holset's billet compressor wheels and journal bearing?
Yup nice strong cheap to rebuild journal bearings ftw.
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Old 06-19-2010, 09:31 PM   #15
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Let me look at my log and Ill let you know when it spools, I love my HY35 seems to spool better then the greddy turbo I had, but then again I am running my tubular turbo manifold w/3" down pipe that doesn't really have to bend down because the turbo is mounted so low I know that helps.

[IMG][/IMG]

also good to know is that the inlet is 4" so unless you modify the housing expect to have to fit a huge filter somewhere. And the compressor housing is just huge packaging is an issue.
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Old 06-19-2010, 09:32 PM   #16
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O ya Im running a built 1.6 w/ ported head with +1mm ex and in valves. and its a track only car.
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Old 06-19-2010, 11:23 PM   #17
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I used Holsets on two 13B Rotaries before in a 2nd and 3rd gen RX7. One was and HX50 and the other an older, smaller H1E. They're both huge but in respects to other turbos used on rotaries, they're tough and they have good spool rates for their size. Mainly because of the relatively slow and cool exhaust gasses of a diesel, they have to be able to have a rather wide flow ability since they're 40 PSI plus capable.

The HX50 would reach 18PSI of boost on a street ported 13B RE at about 3,700 RPM. A similarly ported 13B RE we ran a Garrett T04Z which was a ball bearing turbo. It reached 20PSI at about 3,500. They're inexpensive units and well made but super high heat will kill them for the long haul. Often it's cheaper to buy a good used one if yours fails than to rebuild it. I know BMW guys are huge fans of Holsets too!
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Old 06-19-2010, 11:50 PM   #18
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Oh! Some pics of the HX50 on the 13B RE. Note the dual wastegates. The info above is correct about the T4 flange issues. A little drilling and they will bolt up fine. This setup ran over 60,000 miles then he went to a T51R-SPL and a full bridgeport. These diesel turbos can sometimes be weak when it comes to heat because diesels don't pump out nearly the kind of regular EGT's that the rotaries do...of course until you start wacking out insane diesel boost pressures then it's a whole new ballgame. Assuming the smaller Holset units are similar in this respect, they're still probably more than okay for gasoline piston engines with low to moderate boost levels. Sorry for the very un-Miata relatedness to this but I figured it would show that these Holsets are VERY effectively used on other cars as well. And sometimes pictures help verify.

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Old 06-19-2010, 11:58 PM   #19
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I'm pretty sure no one mines the 'non-miata' posting. Flow and typical revlimits will differ... but at least its still Mazda

Even if it is those wacky magic spinning triangles.
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Old 06-20-2010, 06:05 AM   #20
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I am very interested in seeing "gotpsi?" spool logs!
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