Holset H1C Questions

[Mattz]

I recently bought a H1C and now have questions about it. I was told the 18.5cm would be "waaaaaaaay too big" to run on my 4 cylinder but I'm running it anyways. The question I have is are all of the HC1 compressor housings interchangable or would I have to replace to compressor too? I would like to run a MWE housing and havent really found any info on this specific H1c. Im no dsm guy but after searching endlessly I noticed a lot of info comes from here

My H1C

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Can I swap to a mwe housing if it shares the same compressor size?

 

[genegoesfast]

First off, the housing that's "way too big" is the turbine housing, not the compressor cover. Secondly, it looks like you have a small h1c which is not compatible with any of the mwe housings I'm familiar with. You could have Austin machine your turbo to fit a larger compressor wheel though. If you're running this on a dsm the bep housing for the hx35 will work for you, or you could run their larger t3 housing. Hope that helps, also check out the holset thread.

 

[bastarddsm]

There no real reason to want a MWE cover, other than a 4" intake makes it look like your making power. All the MWE grooves do is trade a bit of compressor efficiency for keeping the turbo from surging. With an 18.5cm housing you'll never see it surge, and I doubt it would with a bep bolt on either.

That 18.5 cm housing will be laggy, but with a t/s manifold, it won't be to bad. Definatly a top-end setup tho.

 

[LandSpeed-DSM]

Well surge is a possibility if hes plumbing it in on a 5.4 ford.. but it sounds like he has a non-DSM 4 banger in mind.

OP what is this going on?

like bastard said, unless this is a big displacement 4 cyl it will be all top end pull.

 

[bastarddsm]

Well surge is a possibility if hes plumbing it in on a 5.4 ford.. but it sounds like he has a non-DSM 4 banger in mind.

Not to nitpick, but if it goes on a v8, there will be a lot more displacement to absorb all that early boost, so I'd doubt it would surge on that either.

Seems to me the only turbos that actually surged were the early hybrid's. Like a FP red, somthing that had a HUGE compressor on a not so huge turbine/housing. The holset is the exact opposite of that.

Speaking of surging tho, I can make my HY35 surge, just barely. I have to be in 4th or 5th at a 3500rpm+ Feathering the throttle just right with make it surge a bit. Its got a lot smaller/tighter hot side tho.

 

[JusMX141]

Can I swap to a mwe housing if it shares the same compressor size?

The smallest MWE-grooved housing made for a H1C backplate is for a 56mm/83mm compressor....yours is 52mm/83mm, so you'd also have to swap compressor wheels as well.

Keep in mind the 18.5cm housing was used to regulate boost to around 20psi on a 5.9L diesel with no wastegate. I think you'd benefit more from a smaller turbine housing and the use of a wastegate, especially if you're running a low boost level like 8-10psi. Running boost that low on this housing will mean a whole lot of waiting for 8-10psi to happen.

 

[tkelly27]

With the 18cm housing you won't spool up soon enough to have surging issues. Tried a 20 some odd cm on a hx35 and it took forever to spool. You probably won't have any problems with the 12cm either, even though it spools up much faster.