More HX-35 HX-40 questions.

[Devildog]

1, What Is the difference between a 12cm, 14cm, 16cm ect... .



2, I was reading that the HX-40 has more CFM at the same boost level than the HX-35, But what difference does it make if the same amount of boost is there at the intake? The engine can only draw so much air, isn't 42lbs. of boost 42lbs. whether or not it comming from a HY-35 or an HX-40, how can more CFM's play a roll at the intake? I understand the exhaust side of the equation with the larger pipe, but I'm a little foggy on intake side.

 

[Devildog]

Well I answered the housing size question.



What is the smallest size housing you can get with the HX-40?

 

[Diesel Freak]

Originally posted by Devildog

2, I was reading that the HX-40 has more CFM at the same boost level than the HX-35, But what difference does it make if the same amount of boost is there at the intake? The engine can only draw so much air, isn't 42lbs. of boost 42lbs. whether or not it comming from a HY-35 or an HX-40, how can more CFM's play a roll at the intake? I understand the exhaust side of the equation with the larger pipe, but I'm a little foggy on intake side.

you are correct... the CFM improvement is only on the exhaust side with the HX-40



the benefit on the intake is COOLER boost. The compressor wheel is larger on the HX-40. This means that it does not have to spin as fast to achieve the same boost pressure.



turbos make boost by accelerating the air in the inducer area and stacking it in the exducer. This acceleration takes place within the compressor vanes... as the air travels along the radius of the wheel it accelerates... . if the wheel is larger the air speed will be faster than a smaller turbo operating at the same speed... . therefore a larger turbo will not have to turn as fast to make the same boost pressure as a smaller turbo

 

[KatDiesel]

Originally posted by Devildog

What is the smallest size housing you can get with the HX-40?

16cm² is the smallest available for the HX40.

 

[KWIKKURT]

Originally posted by KatDiesel





16cm² is the smallest available for the HX40.

I will be selling HX40's with Custom 14cm and 12cm housings with several different other Turbo housing mods avail Very Soon(2 weeks!) . Anyone interested please Email me so I can get the work done all at once and save$$$. These will give you lower EGT's, less smoke, More HP and spool fast! And they will be a direct bolt up allowing you to swap it in fast and easy (1 to 1. 5 hrs) and keep your bolt on exhaust brake!!! They are avail for 300 to 450 HP



-- email address removed --

 

[Devildog]

I want to but one of those, also PIERS is working on the same type of turbo, interesting!

 

[KWIKKURT]

Originally posted by Devildog

I want to but one of those, also PIERS is working on the same type of turbo, interesting!

Piers is a modified HX35. It is a good choice for the 350hp range that he sells it for. If you are going to bomb past that and/or Tow then the Modified HX40 may be better suited. Because you will have lower EGT's with the larger turbine wheel.



The difference in what I am putting together than the other Bombed Hx40's is the direct bolt in /easy install in place of the HX35. But at the same time decreasing the Turbine housing size (depending on use, application and HP)To have almost none of the HX40 Lag when used on the 5. 9 and 300 to 450hp. We leave the center section / wheels Stock Holset Built and Balanced. I will offer some kind of satisfaction of performance warranty. (Much like Power Edges 60 day money back) I would like to have several of the housings custom machined at once since this will save us all money. I plan on having a batch ready by the 10th or 15th of sept. Kurt

 

[Devildog]

I spoke to PIERS the other day and he said that he was building a proto type HX-40 with a 14cm housing. He motified a HX-35 put it into a smaller housing and installed it on his budy's truck, apparently it had no turbo lag at all and was breaking things on the truck from all the torque at the bottom end, he was stating that a little turbo lag may not be a bad thing. All this R&D is great, I have a stock turbo and I can't wait to get something better.

 

[Mopar-muscle]

kurt , does your exhaust housing use a full 4" downpipe or the stock dodge outlet sized pipe , i think its 2. 5 ???



modified turbos scare me , to many failures , including the majestic unit in my garage . i guess at least with yours i can keep my HX35 as a backup , that would give me a warmer fuzzy feeling .



oops almost forgot , would that 14 housing be wastgated ? i hope ...

 

[Devildog]

I want mine waste gated also, what would the waste gate be set to. 40-42lbs. or is that to high?

 

[Vaughn MacKenzie]

KWIKKURT, if you are doing HX40s with 12cm & 14cm that bolt up to a HX35 downpipe, then what is there to gain?? I thought one of the biggest reasons for going to the HX40 was large outlet size & reduced exhaust pressure/better exhaust flow. I would think you'd lose that wonderful mid-upper range HP HX40 users like.



Piers mentioned someone put a 12cm on their HX40 but modified it to match the outlet size of the HX40 (if I understood him correctly). Piers said that thing was "wicked. " Very fast spoolup and probably didn't hurt mid & upper range power.



Piers' modified HX35s are done on the compressor side to make them more efficient/responsive. It probably helps reduce resistance on the exhaust side if less power is needed to drive it (just guessing/theorizing). This turbo stuff can be confusing and I am no closer to deciding what I want than I was a year ago, except if the HX40 was as reliable as the 35 I'd do the 40 in a heartbeat. Even though I only have DD2s, I dynoed at 323hp, so I'm definitely at the upper end of the HX35. I'm only a box away from reaching 400hp.



Vaughn

 

[KWIKKURT]

Originally posted by Vaughn MacKenzie

KWIKKURT, if you are doing HX40s with 12cm & 14cm that bolt up to a HX35 downpipe, then what is there to gain?? I thought one of the biggest reasons for going to the HX40 was large outlet size & reduced exhaust pressure/better exhaust flow. I would think you'd lose that wonderful mid-upper range HP HX40 users like.





Vaughn

It has some thing to do with pressure drop over a short area. Much like a Venturi.



If you are using the Hx40 wheel and 12 or 14cm housings it will be less restrictive that the same housings on a hx35 due to the larger wheel size.



This is also why it would make little difference in the size of the turbo outlet. It is only 1 1/4in in depth and any of the housings are the same diameter where the exhaust gasses leave the wheel (around . 010 larger than the wheel) We do mill the opening to the size of the Hx40 wheel so it is larger than stock. Then in less than a inch it expands to the Waste gate port. All I know for sure is this works I have been swapping back and forth betweeen setups for several months and I am ready to let everyone else try!

Click here



And you can see the difference in the Bombed turbo housing at the Photo Link in my Sig.

 

[Diesel Freak]

This sounds like a great idea... . but...



since this spools up faster than an unmodified HX-40 would it possibly be more prone to failure due to shaft breakage (more stress)? I think this is a great idea, but with the current rash of turbo failures this is a concern of mine. I know that all I would need with DD3's and the Puck is about 36 psi of COOL boost from an HX-40. This looks like a great idea for the over 350HP to 425HP crowd

 

[Diesel Freak]

Originally posted by Vaughn MacKenzie

KWIKKURT, if you are doing HX40s with 12cm & 14cm that bolt up to a HX35 downpipe, then what is there to gain?? I thought one of the biggest reasons for going to the HX40 was large outlet size & reduced exhaust pressure/better exhaust flow. I would think you'd lose that wonderful mid-upper range HP HX40 users like.





Vaughn

once the exhaust gases leave the turbine the cast iron elbow of an HX-35 should be no problem.



Since the exhaust temp is still VERY high at the turbine outlet, flow restrictions have little effect compared to farther downstream in the exhaust pipe where the gasses cool. At higher temperatures gas molecule colisions are more elastic than at lower temperatures therefore they move easier as a bulk fluid (Viscous Flow)

This is why many drag racers wrap their header pipes.

This maintains the higher EGT and allows the gas to flow out of the system easier... ... . generating MORE POWER!



Hmmmmm, after I get my clutch fixed, and the instalation of DD3's and possibly one of these turbos (if they do not break) I am wraping the turbine outlet and the first four feet of my downpipe.

 

[Diesel Freak]

One more thing.



Just to clarify why the HX-40 flows more on the exhaust side than an HX-35. Like KWIKKURT said, the turbine size is larger. This should not be confused with the actual exhaust pipe size that can fit on the turbo. 4" exhaust systems do help, but only to a point.

Smaller housings generate more back pressure because they force the exhaust into the turbine faster and it is there that the turbine blades become the obstruction..... faster spool-up.



KWIKKURT... . What is the difference in area between an HX-35 and HX-40 turbine?... . I am looking for the area of the turbine outlet.



pi((r2)^2-(r1)^2)



r1=hub diameter

r2=turbine blade diameter



I LOVE THIS TURBO STUFF

 

[KWIKKURT]

DieselFreak, You are on the right path... ... I will be removing my Kwikspool tonight to disect it and send it to the first outside testers. I have already ordered more Turbo's and Housings as the response is good. I have no worries if the boost levels are kept at around 40 or less. Any faster and you are getting out of the sweetspot of the turbos output.



With my turbo's I am selling I will try to match the turbo to the User/Truck. Then I am offering varies warranties. This way You can save money on the purchase of the turbo if you waive extended warranties or I may even offer a lifetime warranties.



The use varies so much so should the warranty option.



One Example: I know that turbo's will outlast most motors if properly cared for. So I would waive the warranty to save money on it.



And for the person that is going all out at the strip or mudbog. They know they are going to punish it with Propane, Nitros ETC. And they also would like to save $$$$.

They are the ones that would be a warranty nightmare if you charge for a warranty in this situation you would have to add alittle to every turbo sold to cover this one customer.



Then there is the guy with a EZ box and Injectors that tows a 12,000 fifthwheel... Takes great care of his truck and other than passing a powerstroke on a mountain pass Rarely Runs the 1/4mile. He may like a regular or extended warranty so he has piece of mind and no $$$suprises.



All of them will have a satisfaction waranty If you do not like it send it back. NO PROBLEM. My goal is for everyone to be Happy! (Except my X)