Engine/Transmission (1994 - 1998) Switch from 16cm to 14cm?

[#crnxr]

Need some advice. What EGT and performance should I expect if I changed from a 16cm w/g to a 14 cm w/g housing on my PDR-40? I'll be adding 370's and SBC clutch soon to the #10 plate. The 16cm on the truck now has a lot of lag. I'll be towing 4k-6k lbs. normally. Pre-turbo temps right now are about 800* on freeway and 1000-1100 up hills towing 4k-6k. Plate and housing are both about . 125" forward now. Thanks.



-Kyle

 

[Forrest Nearing]

a 16cm 35 turbine is a whole different animal from a 16cm 40 turbine IMHO.



are you planning on using a 14cm HX40 housing or are you going to machine a 14cm 35 housing to match the 40 turbine wheel?



at your fueling, I might even consider stepping down to a 35 turbine wheel w/ either a 14 or 16cm turbine housing. it'll spool up WAY quicker, and I don't think you'll have out of control EGT's by any means.



Forrest

 

[#crnxr]

I was thinking of puting a HX-40 14cm housing on. I like the PDR-40 except for the spool up lag.

 

[Forrest Nearing]

I thought about putting a 14cm housing on mine, but I'm affraid enough about snapping the shaft...



I'm planning on putting a 35 turbine wheel and 14cm gated housing on mine and using it as my top turbo for twins. I'm running a 38mm external gate, so I should be alright w/ the small hot side.



with your fueling, I think you'll be very happy w/ the HX35 turbine wheel and a wastegated 14cm turbine housing. it should spool up considerably quicker and your EGT's shouldn't change much at all.



my . 02



Forrest

 

[JGheen]

Is the HX-35/40 hybrid the same thing as running an HX-40 with a 35 turbine wheel? That is what I am getting out of your above conversations, but maybe I am wrong... ... .

 

[#crnxr]

I guess I'm just looking for a relatively inexpensive way to keep the PDR-40 but improve spool up time and not shoot EGT through the roof. I can roll on/off the throttle to ease the pain if necessary.



-Kyle

 

[Bob4x4]

Add the 370's your lag will improve greatlyOo.



Bob

 

[JGheen]

I would just go with the HX-40 14cm2 turbine rather than going through the hassle of machining an HX-35 turbine. Your EGTs will go up, just not sure how much as it all depends on how much fuel your going to throw at it. But with the smaller port volume of the 14cm turbine, vilocity will increase hence quicker and sooner turbo spool up. My guess on the EGT increase would be anywhere from at least 100*F to no more than 400-500*F, but don't quote me, again it varies from engine to engine.

 

[Forrest Nearing]

Originally posted by JGheen

Is the HX-35/40 hybrid the same thing as running an HX-40 with a 35 turbine wheel? That is what I am getting out of your above conversations, but maybe I am wrong... ... .

yes, sorry... that is correct.



Forrest

 

[RT66DOC]

Is the Dodgezilla a HX40 with a 35 turbine wheel?

 

[Forrest Nearing]

yes

 

[Cooker]

Originally posted by Forrest Nearing

are you planning on using a 14cm HX40 housing or are you going to machine a 14cm 35 housing to match the 40 turbine wheel?

I'm pretty sure the only 14cm housings for an HX40 are machined HX35 housings.

 

[Forrest Nearing]

well, there ARE 14cm HX40 turbine housings out there, but they're pretty dang rare. I had a line on one, but the guy wanted like $280 just for the housing...



I was able to buy my HT3B and my Tial wastegate for less than that



Forrest

 

[DSpringstead]

If I might solict some advice... ... ... ... .....

I plan to run 300HP -325HP after all the mods & have a simple question, will the stock HX35 do the job or what are my options if any?

 

[Midnite]

325HP is at the upper end of the stock HX-35's capabilities. If you tow you may find you need to back out of the throttle a bit to keep within safe EGT.

Mike

 

[DSpringstead]

would going to a 16cm2 housing help in that department?

 

[hsmith]

And you will be backing out of it often also.

 

[Lil' Dog]

would going to a 16cm2 housing help in that department?

Yes. Slightly slower spool, but you should see better EGT control.