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Holset Turbos, PART 5

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the beginning of the threads should have a brief run down of the h1c. Went ahead and looked spool around 3500+ rpm good for about 400 to 500 hp early version of the hx35 goes into more detail at the beginning of the discussion.

Yeah thats all the info I have been able to pull from all this though. Anyone have an H1C setup?
 
Be careful not to just say what you've seen, there are a lot of different holsets (I'm sure all of us know that by now!)

If you look back in either page two or three of the holset turbo's there was a guy who had an H1E that had a larger exhaust wheel and couldn't get the hx-40 bolt-on housing to fit. On the other hand, I have an H1E and I purchased an hx-40 bolt-on housing and it fit like a glove...

As for the MWE (anti-surge, whatever you want to call it), they do have them. At least the one's that I have and I think dsm_onster has one and I believe andy4g63 has one too.

I would not call it a shitty turbo by any means :thumb:

I was about to say the same. Second, H1E turbo is the only one with 60mm inducer. The HX-40's were respectively 59.80 and 59.90mm. Not that is going to make the difference, but just for the record. I had the link for this and I think i sent it to DSM-onster, but know it is gone.

Third, there is not real data on these. We have to wait and see...

And I have H1E - 60mm wheel on my car !!!
 

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I was about to say the same. Second, H1E turbo is the only one with 60mm inducer. The HX-40's were respectively 59.80 and 59.90mm. Not that is going to make the difference, but just for the record. I had the link for this and I think i sent it to DSM-onster, but know it is gone.

Third, there is not real data on these. We have to wait and see...

And I have H1E - 60mm wheel on my car !!!

I guess working the camera with one hand and holding the tape measure with the other hand was out the question LOL j/k
 
Hey guys can I get filled in one the small H1C? I'm considering one of these combined with the BEP housing for my 95 automatic. These threads are ridiculously long and all seem to be about the hx35 and 40, if anyone has lbs/min and spoolup info could they post it up

I think it said somewhere in these holset threads it said the small h1c was similar to a 16g flow wise. If you can get it to hold a little more boost than a 16g can, you could still make great power with one.
 
I think it said somewhere in these holset threads it said the small h1c was similar to a 16g flow wise. If you can get it to hold a little more boost than a 16g can, you could still make great power with one.

Thanks, sounds like it might be a little small then for a round 400whp then. "Big" H1C it is then
 
The 8blade 58mm compressor is 2mm larger at the inducer than the 52 lb/min 8blade hx35/wh1c. I've personally compared these two compressors and the contour, angle, blade shape, and cover between the two are identical; just a different inducer diameter. Remember that the compressor map (7755AX) shows 52 lb/min at the far right still at 60% efficiency. 2 more mm would give you 7% more area at the inducer. &% more than 52 lb/min is 56lb/min. But, since most of the inlet flow occurs close to the rim of the inducer, that number is not accurate. As mentioned, the "standard highflow hx40" has about 60lb/min to the far right and still maintains 60% efficiency. Since the 8blade 58mm compressor is the most common hx40 I've seen so far, and the inducer is 2mm larger than the 52 lb/min hx35 7755AX compressor, then the 58mm 8blade hx40/h1c/wh1c flows 60lb/min.

The 7765AX 7blade hx35 compressor has been proven to flow 60lb/min. And we have the 7765AX compressor map confirming 60lb/min at 60% efficiency at the far right. But the problem with the hx35, is that you need to run a non bolton housing with the small hx35 turbine wheel to get to that flow potential without running into back pressure issues. If you want to reach 60lb/min with the hx35 you really NEED a t3 non-divided manifold and hella port the divider and reshape the hx35 inlet hole so you can use the hx35 12cm^2 turbine housing as a large sincle scroll housing. You will reach full boost at about 4000 rpms according to TimG's setup.

If you want a bolton 60lb/min holset, the 8blade 58mm h1e/wh1e/hx40 is just for you. You will have enough turbine wheel with the bolton turbine housing to flow plenty for that compressor flow potential. Spool will be about the same as TimG's turbo. You can then always upgrade to the super40 compressor wheel and know you have enough turbine for over 650whp as badman21 has proven.

So it's a question of whether or not you want more later and which manifold you have or are willing to buy. If you have a t3 manifold, and you want 60lb/min, just get a 7blade hx35 and use the stock holset turbine housing. If you want to stick with a mitsubishi flanged manifold, or have put money into a mitsu flanged upgrade manifold, then look at the 8blade hx40 with the bolton housing if you want up to 60lb/min flow potential. The later can be upgraded the the super40 and give you about 80 more horsepower potential. I doubt the hx35 turbine wheel even with a larger turbine housing can flow enough to warrent the hx40 compressor. TimG was running at 37psi with his hx35/40 hybrid. and made a 600whp trap speed for his weight. 37psi with the hx40 turbine will put you at about 50whp more.
 
Bravo... Excellent post. Good Info for everyone.
 
Ok on the BEP housing for the HX-35, are you suppose to drill out the metal plates that would hold the the cartridge to the BEP hotside? My bolt holes don't line up on the plates and the housing.
 
Which housing do you have?? The bolt-on housing uses garret clam style clamps and the T3 .70 a/r uses borg warner 4 bolt clamps.
 
i have the bep housing mitsu bolt-on housing for the hx-35 turbo.It has 6 bolt holes that dont align with the 4 holes on the plate that secures the cartridge in the hotside.

this isnt mine but the bolts circled in red are what im talking about.
 

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Well, this is on the first page of all the holset threads. This applies to the h1c, h1e, and wh1e, just as the wh1c.

Summary provided by wiseman, Dsm-onster:

. . . . .

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.

. . . . .
 
Yep. Where can you get those things new, if you don't have a spare garrett laying around? I'd like to do it right with all the details now that the car is all over the yard and sheds.
 
Any turbo shop should have those clamps. There are two different styles that will work. One is the clam shell which is two pieces. Then there are a three piece set that have two holes each. If you can I recommend these clamps, but I my self have done the washer route to get the car back on the road quickly.
 
Any turbo shop should have those clamps. There are two different styles that will work. One is the clam shell which is two pieces. Then there are a three piece set that have two holes each. If you can I recommend these clamps, but I my self have done the washer route to get the car back on the road quickly.

Not always true mine has a v band clamp on both compressor and turbine side.
 
How does a hx 40 and s258 with the ett compare? Both on a bep housing and both bolton

Which turbine wheel are you talking about for the s258? There's 2: one the size of an hx35 turbine wheel and one the size of an hx40 turbine wheel. This will make a huge difference in spool and flow.

The s258 has a compressor map slightly farther to the right giving it a little more flow than the 58mm 8blade hx40 compressor. But the 60mm super40 compressor wheel still flows about 8 lb/min more than the s258 based on the map.

So which hx40 are you wanting to compare to which s258?
 
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