Holset Turbo Specs/Applications

[WM-300]

Over the past few years, I seem to have gathered a Herd of Holset Turbos from 4B and 6B Series Cummins. Can anyone point me to some place on the web with specs for the Holset Turbos so I can figure just what I have. Also what application each was used on would be most helpful.



Thank You

WM300

 

[PToombs]

Try this, might help. www.dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

 

[WM-300]

PToombs thanks good numbers for 6B series. Now to find Turbo specs for various CPL 4B Series.



Wm-300

 

[dieselcruiserhead]

WM-300, the 4BTs are almost all H1C turbos as far as I can tell. Any GM version low mount turbo is a H1C with a non wastegated housing that is 16cm2. I just got a high mount turbo off a ford version with the centered exhauist manifold. I thought it would have been a H1C but I am not 100% sure, it is a reman unit from Cummins, and looks like it may possible have a 18 cm2 exhaust housing because its's big, and the turbo itself seems awefully small, though I still hypothesize that it is a H1C. Hope it helps. The good 6BT turbos for 4BTs I think are a '94 WH1C with the wastegated 12cm2 housing. But pull off the wastegated housing (if you wish) and use a non wastegated housing. Or the Hy35, which is a bigger turbo with a small choked up wastegated 9cm2 housing. that is what I am using...



Andre with Toyota Land Cruiser in Utah originally from Keene, NY.

 

[WM-300]

I have one WH1C that has a 4. 0" intake and a 2. 0" discharge. What is te application for that large intake. Its so large it looks like it would interfer with the oil filter on a 4BTA (CPL 857).



WM-300

 

[Dscholz]

I know this is a little off the subject and I don't want to violate the rules, but if someone could PM me what I should pay for a 16cm housing in good condition I would appreciate it

TIA,

Dan

 

[dieselcruiserhead]

I have one WH1C that has a 4. 0" intake and a 2. 0" discharge. What is te application for that large intake. Its so large it looks like it would interfer with the oil filter on a 4BTA (CPL 857).



WM-300

It does lightly interfere if you have a dropped exhaust manifold. . I was able to make it work by usiing a 4" Cobra style 90 bend, but it was still a light PITA. But it will be this way with any turbo. The best / easiest method is a H1C (factory turbo) but with a 9 non wastegated housing. The application for a WH1C is 1994 only, so it is still a H1C with the same exhaust flange (I recall mine was a 3" I seem to recall?) but had the bigger impeller and similar characteristics to the larger 12cm2 wastegated HX35 turbos in the Dodges through the mid-late 90's. I used a WH1C with a 12cm2 with a air/air 4BTA on 35's with 4. 10s (would have preferred 3. 73) and loved it, top speed was about 85 mph at about 2350 and it had very good power particularly on the highway. . I am now using a HY35 for this next 4BT that I am turning up to be an air/air "4BTA. "



Cost for used housing should be about $75 to as much as $130. . They never really go bad, new they are about ~$150 retail. . You can often sell them used, you can see over the classifieds section there are plenty for sale and are usually a dime a dozen in major cities with performance diesel shops. .

 

[dieselcruiserhead]

PS I also got my hoses and tubes and such from Charlie at http://www.intakehoses.com/ , I am on order maybe 4 or 5 from them and the service is killer. .

 

[WM-300]

I am trying to learn more about various turbos. I am missing something in the last post. Since the WH1C is still a H1C, what is the design reason for the larger impeller/4" intake ? What advantage would I expect to see using the WH1C over a H1C on a 4BTA CPL 857, Coolant cooled aftercooler ?



Thanks

wm300

 

[JLEONARD]

The WH1C compressor housing has the MWE slot in it (Map Width Enhancement).

When I upgraded my truck from the "baby" H1C to the intercooled H1C, I was getting really bad turbo flutter.

Put the comp wheel and housing from a WH1C on and the flutter disappeared.

I didn't notice any performance change.

Jay

 

[dieselcruiserhead]

exactly as J say, it is a bigger compressor wheel so more air. I am not a turbo expert but I do know more air doesn't always = more power but in this case it did for me. The biggest difference was ability to burn more fuel which meant more power, almost instant response from the pedal when spooled up or already cruising... Also noticably more power on the highway. . Hope it helps. .