So I'm thinking about replacing the larger turbo exhaust housing that came in my 1992 now, after reading the reply to my earlier thread:

https://www.dieseltruckresource.com/...d.php?t=235595

Been doing some searching, and found this other thread from another site, on the potential disaster that can happen when you throw one of the 16cm housings on a HX35. This is what I have on my 1992, correct ?

http://www.cumminsforum.com/forum/89...lset-hx40.html

Or no, does my 1992 have a HX40, but with a different housing ?

Opinons ?

 

Your truck should have a H1C with the 21cm housing if it is original. With the 5 speed I would say go with the 12cm housing or try to get a WH1C (94-95 year dodge cummins) or a HX35 and put that on they both came stock with the 12cm which spools much better for a 5 speed.

 

That same place, PDR, has the 12cm housing as well, wastegated and non-wastegated. I take it my 1992 probably is non-wastegated ?

The 12cm spools better for a 5speed ? What about towing, what kind of issues do you run into there ? I'm neither trying to win any drag races or tow 8,000 pounds over the Rockies, but just trying to wake this motor up a wee bit...

 

Are you towing over about 5k ? ever?

A 12cm would be the greatest upgrade ever, but you may have to drill out the wastegate divider for cooler temps IF it has a wastegate, any 94-95 (Wh1C) or 96-98 HX35 will have a wastegated 12cm housing.

Towing, if your going up a hill say and you ease into the pedal your egt's will go up because of the small restriction of the exhaust housing.

Someone else will join in and shed some light on this one..

 

Might be moving from Oregon to Texas late this fall, that would involve towing a pretty heavy trailer. 5k ? Maybe.

Looks stock to me, those don't have a wastegate, right ? So it would just bolt right on. I'll have a look see in the daylight tomorrow afternoon, this is all new to me. I would assume that the stock housing has a code of some kind on it that would identify it.

 

a 12cm would be fine if all your going to do is run around town. If your pulling loads with it i would not recomend going smaller than a 16cm, maybe a 14 if your pulling light. Your egt's would get too high with a 12. remember, the smaller the housing, the more restriction out the exhaust= more heat.

 

If you intend on leaving the stock injectors in or just a slight increase in injector size the 12cm would perform great. I ran a hx40/12cm with 6x.016 injectors for a while and hauled light loads and never had any real temp issues. I never towed over any big hills w/ that set up, but with stock or slight larger than stock injectors it would tow like a champ, hills or not.

 

I got the 16cm2 and love it for towing but just DD it is just a little on the sluggish side but I went from the 21cm2 and it was still a big improvement but I towed 20,000 lbs and didn't have any issues with EGT's and spool up is good But if you tow at times and mainly use it for DD I say go with the 14cm2 and you still probably wont have to worry bout EGT's and the spool up is a little quicker than the 16cm2

 

If I'm running a stock hx35 and putting in say a 14cm to replace the stock 12cm what would that do for the cold side in terms of spooling or boost ?

 

just a couple of remarks:

the 16 vs. the 21 or 18 exhaust housing will be a difference: spools a little earlier, the feel is like the power comes on at a lower rpm (I changed mine over a year ago, and liked the difference: it is not huge, but that's not what I'm after). Small changes and getting the feel for them is one way to go.

I second cedardiesel for everything he said about towing heavy. As a side note, 5k of load plus the weight of the trailer is not really towing heavy. These trucks are rated heavier than that and can pull even more. So, 16 with stock turbo or hx35 will be a conservative mod for such usage.

As for the guy who destroyed his HX35: if you look at the mods in his sig., it is obvious that the engine is pushed a little beyond the envelope of reliable operation. Maybe OK for a few weeks or months or if you like to spend your weekends bent over the engine, or whatever, but someday something gives: turbo, head gasket, pump, whatever.

So, depending on what you want out of the truck and how often you like or will be able to do work on it, you can choose some mods that will get you there. That's where I would start. Just my 2 cents...;-)

 

I tow heavy over the Rockies, pulling the RC out to Moab, etc, and my PDR HX-35/14cm-g setup is fantastic. I have plenty of fuel (PODs, PDR pin, full fuel just shy of screamin'), and I can cruise up the back side of Eisenhour grade in 3rd at 40 mph - pyro at 1200*, boost at ~22 psi, tranny and engine b/t 205-235* - no sweat. But I also have a 89% DTT clam (essential eqipment), an ATS pulse 2nd gen exhaust manifold (second essential equipment), and of course our own ASA Intake, 4" DP, and exhaust. The DTT clam and ATS manifold made 'the' difference for towing - I can easily set the cruise at 70 mph when towing flat (~10,000 lbs) and it'll maintain normal highway hills, cruise on, without going over 1200*. I stay between 65 and 75 mph when towing heavy mostly for fuel mileage - it'll do 75 but I'm not usually in that big of a hurry, and then there's slowing it all down and the stock brakes are marginally good at best for that. Soon as the heat starts coming up to 1100-1200* the boost catches up and heads for 30-35 psi, and levels out the heat. It's awesome to watch - you think you need to kick off the cruise and lift.....but nope...it's good to go. A 12cm housing would be too restrictive getting the heat out. It'd spool crazy fast but I'm less concerned with spool rate compared to heat retention. The 14 is awesome, especially with the ATS manifold. It'll hit the wastegate at 40 psi and the truck is either smoking the rear tires or passing someone.
Eventually the '93 is getting a NV5600, exhaust brake, twins, water meth, and some mild engine work, and with that the rig will be pretty much bulletproof.

But the Ramcharger is another story. It isn't a tow rig - it's a trail rig, and I have a 2nd gen HX-35/12cm-g combo on it and it loves it. I have gauges going in this week to verify I'm not cooking the pistons but the truck 'feels' great. It does spool maybe a bit faster than the 14, but who cares - once spooled it's making good boost and moving the machine (thumbs-up).

- M2

 

Well since I have the same truck I will throw in my .02. I went with the 16cm housing over the 12 or 24 because my truck has and will see some pretty big loads, like 28K+ GVW. I haven't done that with the mods in the sig, but I did haul my 79 W150 over some pretty steep and long hills. I could control the temps very easily and never had to worry about it. The truck loves the new housing and with 4.10's it spools very well. If I was building another truck for a DD I would go with the 12 and a 5spd, but that truck would not see a trailer.
DS79

 

I've heard the 14cm is a way overpriced waste of $$, very little difference from a 12cm or 16cm...

Get a 12cm and port/polish it with some air tools.

For the ORIGINAL POSTER of this thread... I'd recommend getting a 12cm exhaust housing off a 94-98 truck.... Its going to be wastegated no matter what if its off a 94-98 truck so you'd have to buy a wastgate actuator and its associated parts to hook up the wastegate which will be nice for future mods.

your stock 92 turbo is non wastegate and the "21" should be stamped on the inside of the exhaust housing where the downpipe connects.

Or... you could get the whole turbo off of a newer truck (96-98) known as a Holset HX35... Its a tiny tiny bit more efficient do to a mwe slot in the compressor and will have a 12cm housing on it already (wastegated). And it will sound sweeeet. I love the jet engine whistle of a HX35 i the morning

blah blah blah

 

The PDR site offers a 14cm non-wastegated for $185, same price as 12cm. 16cm is $165.

I don't have hundreds and hundreds to spend on whole turbos, etc. This economy is killing me, 200 bucks seems like a cheap mod I can barely afford right now.

One thing at a time.

So the 14cm might be a good compromise between 16 and 12 ?

I do have to tow a heavy U-haul across the West this fall.

 

Oops, looking at HHT's site, the 14cm non-wastegated won't fit without mods.

So, looks like 16cm it is.