WH1C Mods

AHall

AHall

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Apr 2, 2007
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Im in the process of going from my single garrett to a wh1c/gt42 and am looking for info on modding the wh1c. I know about the stage 4(HTT) h1c/h1e which is basically a hx35/hx40 hybrid. Anyone have input on spool time difference in the stock 56mm to the 60mm 6 blade? Also what is recommended on wastegate port modding? I measured the hole and its about .775". I was thinking about drilling the hole to 1.0". Also would it be a good idea to drill thru the divider to help wastegate the other 3 cylinders or if there is another method? Any help is appreciated thank you.
 
Bump. And i heard drilling through the housing might cause turbulence and possible have ill effects.
 
my hx35 had the 12cm housing and the center section was taken out to wastegate both sides. No problem as far as i have seen.
 
I put a 12cm exhaust housing on mine and it made a huge difference, depending on what yours has for a housing. I drilled through to the other 3 cylinders with a 1/2" drill bit. Im happy with mine, on my 92 cummins.
 
Ya the h1c/h1e uses the hx40 six blade 60mm comp wheel and a machined backplate and cover. Mine has the 12cm2 exhaust too. On my brothers truck he went from hx35 8blade 56mm to 6blade 35/40 60mm and it spooled quite a bit faster. As for drilling the volute... I was thinking of doing just that, but was wondering if there are actual gains and it actually wastegates the other 3 cyl.
 
12valvetater said:
As far as I know the cartridge doesn't need to be machined when you hybrid an h1c
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The cartridge doesn't get machined. On an h1c the backplate is held on by 4 bolts and is removable. The recess where the major diameter(exducer) fits into needs to to bored out a little bit on a lathe.

And i think the h1c/h1e and hx35/40 hybrids should perform the same because they both use the same wheel. I know that the hx40 comp housing and wheel have a part # but haven't found anything about the h1e comp housing. As far as i know the stock housing has to be machined to fit the wheel. Maybe thats another reason its $425 instead of $300 from HTT.
 
Does anyone know for sure if all are machined from stock comp housing or came on a stock turbo?
 
Yes you should drill the divider as it will wastegate all 6 cylinders, or remove the divider so there will be no turbulence issues.

turbo006.jpg
 
Cummins35.9 said:
Ya the h1c/h1e uses the hx40 six blade 60mm comp wheel and a machined backplate and cover. Mine has the 12cm2 exhaust too. On my brothers truck he went from hx35 8blade 56mm to 6blade 35/40 60mm and it spooled quite a bit faster. As for drilling the volute... I was thinking of doing just that, but was wondering if there are actual gains and it actually wastegates the other 3 cyl.
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:umno: unless there was fuel added at the same time.
 
rockjeep73 said:
Yes you should drill the divider as it will wastegate all 6 cylinders, or remove the divider so there will be no turbulence issues
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With a divided manifold, removing the divider from the turbine housing (like your pic shows) will create turbulence! In no circumstance whatsoever will removing the divider improve performance, the gasses must funnel back down to enter the turbine wheel. If more flow is needed change the turbine wheel.
 
LReiff said:
:umno: unless he added fuel at the same time.
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Nope plate was slid and it improved spoolup, then a little late he went with the hybrid and spooled over 100rpms sooner. Guess every truck responds differently.
 
Im sure actual wheel speed is down, but it gains more boost at a lower rpm and has more power at a lower rpm so the technical term might that the boost response improved.
 
LReiff said:
With a divided manifold, removing the divider from the turbine housing (like your pic shows) will create turbulence! In no circumstance whatsoever will removing the divider improve performance, the gasses must funnel back down to enter the turbine wheel. If more flow is needed change the turbine wheel.
Click to expand...

well yes, either way there will be turbulence, but with the divider removed there will be much less as opposed to a hole through the divider.

we are not talking about flow through the turbine wheel but rather flow through the wastegate passage.
 
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