Hey guys. I am running a stock WH1C over S475 75/96/1.32 in my 94 drivetrain based Willys Pickup. It seems to spool pretty quick and I'm making about 55psi of boost right now. I need to check the PSI on the S475 again since doing some changes but last I checked it was pushing 20-25psi.
Anyways, I took off my intermediate pipe the other day when trying to seal up some boost leaks. It looks like a piece of slag or something must have went through my WH1C. The compressor wheel is pretty chewed up.
So it looks like I am going to need to do a rebuild, but figured I might as well look for an upgrade while I was at it. What are my best options? My only stipulation is I prefer to not to change the configuration and have to redo the piping. I took the "adapter" off the hot side of the WH1C and my intermediate downpipe or whatever it is called has a flange and is bolted right to the turbo.
Ok. Did a lot more searching and it seems I might want to look into a 60mm compressor wheel upgrade? Have to get a bigger compressor housing as well? Or is that something I could turn on the lathe...
I guarantee that compressor wheel is Chinese.A genuine Holset wheel will run close to $100, if not more. If you want to see what the Chinese wheel will do, go on Youtube and search "Chinese turbo explosion".
If you can do the machine work for free, you might as well if you need to buy the wheel anyway. The problem with upgrading the WH1C/HX35/351CW is that by the time machining costs are factored in, you might as well have just spent another $200 and gotten into the S300 platform.
I am the foreman of a metal shop, so it will just cost me my time. I would think the most difficult part would be matching the compressor profile.
I'm guessing the spool time would be relatively close or even quicker since the 60mm wheel can push more volume while still using the same 12mm exhaust?
I would try to find a print of the wheel, or at least some literature from the manufacturer that has a diagram of the profile with the appropriate diameters and radii notated. A mismatch between the wheel and the cover profiles will seriously hurt compressor efficiency.
Keep in mind, the compressor is extracting horsepower from the exhaust side. The more air the compressor moves, and the more mass the wheel has, the more shaft horsepower is needed to overcome inertia and spool it up. You may not necessarily notice a delayed spool, but you won't spool faster with a larger compressor wheel.
Lol. I wasn't saying that was the actual one I was going to buy. Just that that was the wheel size, ect. I was just doing quick searches to get part numbers and such for the idea. Seems like a worthwhile upgrade.
Go through the KTS catalog linked above. There are many HX35/40 billet wheels to choose from. You could go with a bigger 60mm wheel or stick to a stock sized wheel with the added engineering of extended tips, slim hub, etc. and not have to machine your housing, have the same or faster spoolup and even gain some flow.
I have purchased about a half dozen KTS wheels and the quality is very good.
When I rebuilt my turbo I bought the parts from Turbo & Electric Sales and Service in Phoenix. The parts came in boxes with Holset labels, and they said they only use genuine parts for their rebuilds because the non-OE stuff is crap. Their words.
FWIW my wheel is not a stock WH1C wheel either. Didn't find out it was an upgraded wheel that needed a different backing sleeve until I went to assemble it I worked at a machine shop at the time, so I turned it down and surface ground it to allow the new wheel to fit. It blows 35psi without breaking a sweat.
I have never noticed any performance gains with an aftermarket wheel on my hx35s. Ran a 60mm on one and a 62 compressor/64 turbine on the other. Speaking of cheap Chinese products, an eBay rebuild kit lasted 2 weeks lol by the time you buy oem kits and wheels, do the machining, get it balanced, you will be in it well over half of what an s 300 is worth, but with an s 300 you will feel actual performance gains vs trying to imagine them from a simple wheel upgrade. Just sharing my personal experience on the subject.
I may get some heat here but another option if you didn't wanna change any piping is a nodded stocker from someone like Tater turbo. Most people seem happy with his product and the performance they get. However I have never tried him out so do your own research first
What kind of performance gains were you looking for? I don't feel I need any more top end performance, I have the S475 for that... I just need to give the turbo a rebuild and put a new wheel on it since mine is chewed up. My truck feels like a dog off the line; it does get to 55psi quick overall (need to check actual RPM for reference as this is my first Cummins) but it seems to take forever to get from 0 to 15psi. I'm guessing the chewed wheel is the culprit. Even If I mash the pedal while I'm cruising the highway at 60mph torque converter locked in 4th at 1200 RPM or so; it takes like a half second to kick down to 3rd (about normal I think?) but then about another 3/4 second or so to build boost back up that it just lost from the shift.
Maybe I need to get a video so you guys that are more experienced with these setups can give some insight on my spooling. I feel I have it tuned pretty good right now for stock injectors. If I rev in park I will get a slight puff of smoke. On WOT take off I get decent smoke (to light the turbo right?) until I hit about 10psi boost where it clears up almost instantly and I jump to 55psi. During cruising in over drive I can lean into the throttle and keep it clean; if I abruptly give about 1/2 or more throttle (while keeping it locked in 4th) Ill smoke until I build about 15psi of boost or so.
Hell yea man. It's a blast. I have a build thread in the conversions forum. Link suspension front and rear on bags. 3/4 ton axles from the dodge. Power steering and brakes from the dodge. Cruises the freeway great. Gotten up to 90mph so far.
for the wh upgrade, from my experience with a hx35, I upgraded to hx40 housing, and a balanced billet wheel from ebay, and it rocked.
next time I'd just bore out a stock housing, and buy a wheel. billet wheel is nice and light.. works well with 12cm housing
I was hoping for a noticeable amount of power, 20-30 hp or so, since I had more than enough fuel for the 56 mm stock wheel. I feel as though the 62 moved virtually no more air than the stock 56. Switched to a 63 mm borg and there is no denying that the air supply is increased lol cleaned up the fuel a lot better and you didn't need a dno to tell you you're up in power. I don't think it's the extra 1 mm that made the difference. It's the design and research behind the wheel that makes the difference
I have a HX35 with a 60mm wheel in it, I've since changed turbos, but it is definitely a little slower spooling than the 56 and 58mm versions.. Flows pretty good, I was probably in the 300hp area with it at about 35PSI... I don't know where or who built that turbo, or if it was a chinese wheel, but it held up alright, a buddy will be using it next. Seems to me the 351 I have, though also 60mm, flows a lot more air
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