i ambuying an HX40 soon, and im wondering what needs to be done to make it a hybrid or is that not how its done. I have had, truthfully, no experiencs yet with a turbo build so im new! I was wondering what was needed because i can also have some one on one guidance when i travel out to ohio for school. Curious if you can give me a list of needed supplies.
Thanks,
John

 

If you are buying an hx40 that's not the same thing as a hybrid. an hx40 is a bigger turbo off of an 8.3 cummins that many people use on our trucks as an upgrade. a 35/40 hybrid is when you install a hx40 compressor housing and wheel on a hx 35 turbo so you keep the same center section and exhaust housing.

Now on that note unless your turbo is fairly new it is going to need to be rebuilt before it can be upgraded in wich case you would be better off just buying a new turbo. Another thing is once you get those 370's and dv's a hybrid is not even going to be enough turbo to keep things cool. You might get away with a full hx40 but most will tell you to skip that and go to a 62mm or bigger s300g variation (htb2 from htt or ps62 from II) But if you haven't had your auto tranny built up some I wouldn't do anything more than you have now until you get that taken care of.

Go here http://www.htturbo.com/ and look around, they have all the turbo stuff you need, are great guys, and have a very informative website.

later....Josh

 

I have a 24v and so in my experience with a hybrid, unless you are getting a killer deal on the HX40 take a hard look at one of the newer s300 variants.

In my case the hybrid had a hard time getting back on top of the EGT's if it got behind the fuel.

Jim

 

Exactly, HX 35/40 is a 35 with a 40 compressor. Mine was fun but the egt's would just get out of hand. Took a 48psi blast to blow it and force me into getting a HX40. Found one heck of a deal. You are going to need a 40 downpipe if you go to the HX40 or the s300 variants. The 40 can still get hot but it takes alot more work, that it for sure. With the dv's and 370's you are going to blow that auto to pieces.

 

the tranny was built by a local shop! and the hx40 is only 10030 dollars. My uncle had a hybrid on his 03 with a tst box. he could peghis pyro in sceond but it imediatly came right down. He could hit 50 psi and have half a pedal left,I know cuz i drove it, At 50 psi though his intercooler boots blew off the turbo beause the compressor housing tended to twist.

idk, im just looking for something bigger than the hx35...
btw, max temp i can get with my truck right now is abou 1250 degrees.... our buddy who pulls out in ohio laughed at me, then E.E.P. recomended a converter and valve body with some 370's to start and then a bigger turbo and D.V's.

 

the H1C, WH1C, HX-35, HX-40 all use the same shaft and turbine. The only diff is the size of the inducer and how the compressor housing mounts to the center. I know for sure because I have them all taken apart on my floor right now. I am going to make a 35-40 hybrid. You can get a 16cm w/g housing for your 40 but it will be a bit slow. with the hybrid you can go with a 14cm like I have. I have a friend that broke the shaft on a 40 by boosting over 48psi Piers only sets theres to 40 but they stay in one piece. I may go with a 62 wheel.

 

I belive the defuser is different between the 35 and the 40s

 

i am going to probly do an htt compressor housing on the stock turbine, i'll go with stageIII since i am looking for dvs and injectors... im not beating on the truc so i dont think it will get too too hot.

 

Ramdriver I'm thinking about doing the same thing can this be done with normal tools?Let me know what you do.....

 

well it loks as if there is a lard sna ring on the backof the compressor housing, anice pair of pliers will work i would think, and also there isw a nut on the compressor wheel that looks fairly easy to remove. im not t sure what all else is involved yet.
some one chime in and redirect me if im wronge...
probly wont be doing too much to the truck untill i get my taxes back.... all info is welcome on this procedure. i do know it took a buddy who built my unlces turbo about 5 minutes to change the compressor mabe housing to a different size.

 

That large snap ring isn't as easy as you would think. Make sure you have a NICE set of pliers.

 

Nah, just some small flat blade screwdrivers to wedge between the large snapring and the housing edge. Get two of em in there and you can pop the ring right out. I've done hundreds of em back when I built turbos. Of course, the right snapring pliers do a much better job, but they aren't always accessible

 

Large Snapring - removes compressor housing from center section.

4-bolts - removes turbine housing(exhaust housing) from center section.

This leaves you with a "CHRA" (Center Housing & Rotating Assembly)

After this the cast nut on the turbine wheel should be locked into a bench vise, careful not to damage the blades of the wheel.

Remove the small nut on the compressor wheel very gently.

Slide the compressor wheel off the turbine shaft.

Now you can install the bigger compressor wheel and housing in the reverse order.

Although it would be highly recommended that you have the two wheels VSR Balanced so it doesn't come apart inside the housings at over 200,000 rpms (speed of the turbo not the motor).

Why is it critical for turbos to be balanced? Imagine driving along with a brick attached to your wheel rim. The vibration at 70 mph would blur the mirrors and shake every nut and bolt loose. Imagine this effect in a turbocharger. But instead of 70mph, the speed of the turbine blade tips are now travelling around 850 mph. The imbalance weight may be tiny, but the effect on the turbo components is just as severe. The result is turbo failure.

Personally I'd send the CHRA assembly to a reputable turbocharger repair shop and have them install new bearings, rings, and balance the wheels. When they send it back, all you'll have to do is install the 4 bolts for the turbine housing, and the big snap ring for the compressor housing...and you're all set.

I've built several Holset-based hybrid turbos. My old 1st gen had an HX35/40 Hybrid with internal oiling modifications and a 16cm WG housing with the flapper welded shut. Made 46psi and used every bit of it. It was VSR balanced at 210,000 rpm and after shutting off the engine, the turbo would continue to spin for about 2-3 minutes, much like a ballbearing turbo.

I have a pretty custom turbo on the shelf that I'll be tossing into my '97 when the time is right. I built it about 4 yrs ago in hopes to one day own a 12-valve 2nd gen to bolt it on to. It's basically an HX40 with heavy modifications to the oversized compressor wheel & housing/turbine wheel & housing/bearings & internal oiling system/custom wastegate and actuator.

 

thganks for the description. now im gonna have to fingd out if any lace around here an balance such assemblies, although i bet that fancy turbo of your that no one will even have any idea what im talking about...lol mabe mass diesel will...

 

When you find out keep me posted as I said I want to do the same thing,if I only had the cash for a real turbo....................