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jordan

Custom made compound turbo set up (turbo sizing question)

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I acquired a Holset turbo off of a 3 cylinder Cummins. the assy. # is 3524121 and the serial # is 1401616. Is this a suitable size turbo to be combined with my stalk turbo on my 92' w250? I took a very close look at my spare turbo and was barely able to make out the model # but it said type-H1C i believe it is the 72mm model, I'm still looking for any info on it's max CFM. In the process i found some very useful info that Holset owners should enjoy (service, repair, and a pocket guide for every Holeset turbo!) :)http://www.holset.co.uk/mainsite/files/4_4-service%20literature.php

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i got some new info on what i'm doing with my set up, i took my original H1C and put the 12cm housing off the extra turbo on it (i think it was actually a 4bt it came off) i'm going to make a external wastegate to bolt in between it and the manifold. the wastegate and turbo are going to feed a HX40w with what i think has a 16cm housing.... this link should get you close to where the old one was going to send you as-well seeing as how it no longer works http://www.holset.co.uk/mainsite/files/4_4_3-Reference Sheets.php i got some pictures of the setup now, just not bolted on the truck yet here they are post-10236-138698181131_thumb.jpg

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i got some new info on what i'm doing with my set up, i took my original H1C and put the 12cm housing off the extra turbo on it (i think it was actually a 4bt it came off) i'm going to make a external wastegate to bolt in between it and the manifold. the wastegate and turbo are going to feed a HX40w with what i think has a 16cm housing.... this link should get you close to where the old one was going to send you as-well seeing as how it no longer works http://www.holset.co.uk/mainsite/files/4_4_3-Reference Sheets.php

i got some pictures of the setup now, just not bolted on the truck yet here they are [ATTACH=CONFIG]3254[/ATTACH][ATTACH=CONFIG]3252[/ATTACH][ATTACH=CONFIG]3253[/ATTACH]

subscribed and waiting :)

--- Update to the previous post...

i got some new info on what i'm doing with my set up, i took my original H1C and put the 12cm housing off the extra turbo on it (i think it was actually a 4bt it came off) i'm going to make a external wastegate to bolt in between it and the manifold. the wastegate and turbo are going to feed a HX40w with what i think has a 16cm housing.... this link should get you close to where the old one was going to send you as-well seeing as how it no longer works http://www.holset.co.uk/mainsite/files/4_4_3-Reference Sheets.php

i got some pictures of the setup now, just not bolted on the truck yet here they are

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your officially my first subscriber! thank you you'll also be glad to know i got some pictures :thumbup2:post-10236-138698181207_thumb.jpgthe wastegate flapper and housing still has to be made along with it's plumbing but that's where she's going to sit, unfortunately i can't do a full 7" turbo back, at least there's only 4' of flex pipe lol

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i ended up using my stock turbo (8 blade H1C, intercooled model) and throwing a 12cm housing on it i'm still in the middle of making the wastegaste (no way in hell i'm pay $300 for something i can make) i still have the turbo it's got the big housing on it now but the compressor wheel is the 7 blade model and smaller non-intercooled copressor housing---update---got some different angles of the turbo and a couple pics of the exhaust in the making not everything is seated in place yet but it's getting close. and for those with a good eye yes that is a 2001 gmc cab and yes i do have about 150 pics of the build and if Mike doesn't mind i'd be more then happy to upload them for you guys with a write up of course :drool:

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finally started the old girl last week after she slept for 4 months took a video too ;) she sounds a little ruff but it was really cold and i didn't use the grids (hot wired for time being) didn't let it warm up either i got no rad at the moment and waste gate valve isn't installed yet so not much turbo whistle either

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