Turbo housing question

['956Wheel]

I read about changing turbo housings, I've got a couple questions for the bros.

1. ) Is it the turbine or compressor thats being upgraded... both?

2. ) What is the effect in doing so?

3. ) Why/when is this of performance importance, i. e. larger injectors, pump mods. ?

Mike

------------------
9535hundred

 

[HEMI®Dart]

Stratland,

1. ) Neither. Its the exhaust housing you are changing. See the picture below:
#ad



2. ) Lets the engine breath better than the OE 12cm2 turbo exhaust housing. Less back pressure, more power & lower EGT's. A trade off is a little slower turbine spool up.

3. ) TST says 300 HP is the limit for the 12cm2. Once bigger injectors and a strong torque plate are added, some trucks can have high EGT problems. The 16cm2 exhaust housing can lower EGT's. This is a controversial subject. Ted Jennaty runs a 450+HP 12 valve with the stock 12cm2 exhaust housing. No EGT problems. He has experimented with all sizes. He likes the 12cm2 best.

More exhaust housing info here: http://www.tstproducts.com/turbine_housings.html

More good info in the thread by Drawson: https://www.turbodieselregister.com/ubb//Forum1/HTML/002698.html



[This message has been edited by HEMI®Dart (edited 02-24-2001). ]

 

[Cooker]

Here is another great thread on the topichttps://www.turbodieselregister.com/ubb//Forum3/HTML/000849-2.html

IMHO the 16cm is a great upgrade if your EGT's are really giving you a headache, otherwise stick with the 12cm.

(edit: had to fix the link)

[This message has been edited by Cooker (edited 02-25-2001). ]

 

[MikeR]

A while ago someone had a HX35/16cm2 housing for sale in the classifieds section that also included a 1" spacer so you wouldn't have to move the exhaust system forward. Does anyone know who sells this spacer? From reading the many posts about the 16,it doesn't seem that the 16cm housing comes with the spacer.

-Mike

 

[Joseph Donnelly]

Diesel Injection of Pittsburgh 724-274-4080 sells the 1. 25" thick spacer and a second band clamp.
I'll believe 450 hp with a 12 housing when I see the Dynojet printout, not voodoo calculations. I feel the 16 on the HX40 is what should be used for that power level.

 

['956Wheel]

O. K. so it sounds to me like the stock turbine housing is fine unless you modify beyond its flow capacity. Am I right? I could see where slower spool up would come into the equation. Now I just wonder why or if they do not put larger blading in the turbine (exhaust side). It would seem that the turbo (entire, i. e. turbine & compressor) would be a "matched set" as far as the blading of each, right?

Thanks bros

------------------
9535hundred

 

[Jones]

Hello Statland,
The only change is the exh housing itself, the turbine wheel fit is forgiving enough that it'll match all the housings. Difference comes from the scroll size and flow characteristics (some thing refered to as "A/R" ratio. My 12 looks dwarfed setting beside the 18. 5 that came off the engine.
Hope this helps, Jones

------------------
Jones
'84 Ramcharger w/CTD, non-gated 12, torqflite, NP205, Dana 60 and 70 w/ 3. 07s. Looks more or less stock.

 

[PHaller]

I changed my housing to a 16 cm2 because the EGTs were high towing my behemoth 5er trailer. I am also running a #6 TST cam plate and a TST spring kit. My EGTs went down about 150 degrees and my mileage went up about 10% after the change over. I initially had trouble getting the turbo to spool up while towing and starting out on a slight grade but the spring kit,giving me more fuel at low boost, solved this. Other then slower spool up from idle I like the housing and after talking with others this problem can also be solved by adding even more fuel like a 270 plate.
-Paul R. Haller