Engine/Transmission (1994 - 1998) turbo housings

[Jim HaskinsJ]

Please educate me on turbo housing sizes? is bigger better?

I am running a #11 plate at the stock position and am going to install 330 injectors. I pull 2100lbs and will upgrade turo to a hyred H35 but must keep exhaust brake. THANKS

 

[Forrest Nearing]

bigger isn't necessarily better... bigger means lower peak EGT's and a slower climb to peak EGT's... can also mean a little better highway mileage. but, the turbo won't spool up as quickly.



BUT, more fuel helps to spool up the turbo!



Forrest

 

[JGheen]

Well, not sure what your asking here. Do you want to upgrade the compressor to an HX-40 or do you want to upgrade the turbine housing to a 14cm or 16cm?? What are you running now?? I think you said you want run a "hybrid" HX-35 but your typos prevented me from answering.

 

[Joseph Donnelly]

You can find a lot of info in TDR Issue 23 (order the back issue).

 

[Jim HaskinsJ]

Sorry I did not make my self clear.

My question is I think I can get enough fuel with the #11 plate and 330 injectors but am a little cocernrd about EGTs pulling long hills. I now see about 1000 deg. @2000 rpm and 20to 22 PSI in 4th gear. if I install the 330 injectors and maybe move the plate up a little I would like to make the same pull at around 2500 RPM. I am still using the stock turbo I do not know what is stock for a 97 215 HP nor what is best for towing with increased fueling.

Is a 14 or 16 CC exhaust housing going to increase air flow through the cylinders and help with the EGTs I assume the H35 turb from Piers will keep the boost in the proper range.

 

[bmoeller]

Stock turbo on your truck is a HX35-12w (wastegated).



If the turbine housing it too big, it can make the EGTs higher (and climb faster) than what you had before. Also, the peak boost will be lower because there isn't enough air to spool the thing.



May want to read this- http://www.dodgeram.org/tech/dsl/FAQ/turbo_faq.htm

 

[Deezul1]

See my sig below. I run a nonwastegated 16cm housing and EGTs are not a problem towing a 6500lbTT even on high mountain passes its not bad but I have to keep an eye on it if I am running 70mph up the mtn. Otherwise it works well with the PDR-35 turbo.