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Technical Info: 1st Generation Technical discussion of first generation (1989 - 1993) questions, solutions and upgrades. All 1st generation topics are suitable for this forum.
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Old 2 Weeks Ago
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Question H1C upgrades

Need some input on what more I can do to my H1C to get more air out of it and not drive my EGT up doing it.
1st off, I don't have much money to put into this. I know that limits me a lot, but that's life in the poor lane.
Considering other turbos is mostly out of the question because of other associated costs to do the conversion.
Also considering the Alaska factor, if IF you can find it you bill be paying a lot more for it.
My current thoughts a bigger compressor wheel and maybe a bigger turbine wheel.
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92 W250 Xcab 4X4, HD 47RH with Compushift, GDS moded H1C/w 16cm, custom ground fuel pin, 7X010 DAP injectors, gauges and some mild tuning. Hits 35psi now.
01 2500 Q cab 4X4, stage II auto, fresh VP-44, HX35, B T E and F gauges, FASS 95 adjustable.
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That big, non-wastegated exhaust housing is slowing your engine acceleration imo.
I don't know where you'd find a tight wastegated housing though.
I believe a stock HX35 would make more boost air for you.
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01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley style lift pump next to the fuel tank...13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, jammer 100's, 62-65-.70A/R, ARP studs, kevlar/ceramic SD clutch

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I just built one yesterday, that turbo is quite limited, you can of course put on a 16cm turbine housing, then you can go with a 58mm compressor wheel or a 60mm compressor wheel. This of course requires the compressor cover to be profiled. No known larger turbine wheel that I know of. I had a 60mm c/wheel on mine once, I lost boost, didn't have enough fuel I think. I put in a 58mmc/wheel, and I can get 32-33poundx of boost when I peg it, and hardly any black smoke. We can supply the customer with either a cast c/wheel or a billet c/wheel.
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I have a few years ago seen a Holset H1C 12cm exhaust housing on the shelf, it would spool up very quickly, but im sure your egt's would be off the chart.
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There is nothing I can do to an HX35 that I cant do to an H1C, so why spend the money on it. Mine already has a 60mm compressor upgrade and a 16cm exhaust housing. This combination worked great when I still had the stock injectors with it. A 62mm compressor is available along with an assortment of gated and non-gated turbine housings and a larger turbine wheel. My experience with smaller exhaust housings has always been higher exhaust temperatures without really improving boost, just spool time which is currently not bad.
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RIP 1991.5 1991.5- 8/14/2013
92 W250 Xcab 4X4, HD 47RH with Compushift, GDS moded H1C/w 16cm, custom ground fuel pin, 7X010 DAP injectors, gauges and some mild tuning. Hits 35psi now.
01 2500 Q cab 4X4, stage II auto, fresh VP-44, HX35, B T E and F gauges, FASS 95 adjustable.
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Old 2 Weeks Ago
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Hood stack...if I remember correctly my 1st gen exhaust was pinched tight at the transmission and the bend at the rear axle.

https://www.youtube.com/watch?v=hlnbulzagPU
Hey, this truck looks like Pigiron.....is somebody keepin' secrets?
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01.5,Red QC Sport SWB,HO,6spd,4x4,cowl hood, Drag Comp,4"ex., fuel press. gauge, boost&pyro gauges, bhaf, single Holley style lift pump next to the fuel tank...13psi WOT, Vulcan Big Line, cheapo fuel cooler, Amsoil in the trans. & Valvoline in the pan, jammer 100's, 62-65-.70A/R, ARP studs, kevlar/ceramic SD clutch

Time to turn so's you don't burn.

Quote:
Originally Posted by cougar View Post
If you remove the gutters, you won't have to clean them. Problem solved..
True love is when she gives you the ham from her egg mcmuffin

Last edited by Clunk; 2 Weeks Ago at 10:02 AM..
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Mines in nicer shape than that one Clunk.
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