1G Which Turbine Shaft

[GSX93DSM]

I'm putting a tdo5 20g wheel on a 14b chra.Im in need of a turbine shaft. The 20g compressor wheel is extended tip.What shaft do I buy?

 

[Dsmkauai]

Are you machining the Chra to be able to work with the 20g wheel? All tdo5's use the same turbine wheel/shaft.

 

[GSX93DSM]

I don't have to machine the chra.

 

[Dsmkauai]

It's already done? I saw a post awhile back that should help you. Let me see if I can find. If not pm justin on here. He will know

 

[GSX93DSM]

I have 20g compressor housing and a 7cm hot side

 

[CrackedDSM]

Unless the CHRA has been machined, you absolutely do need to have it machined. Even with the 16G superback bearing, it's circumference is bigger than a 14B wheel and needs to be milled out on the CHRA. About the only thing you can just put in and go is a small 16G wheel or another 14B compressor.



In answer to your question, the stock TD05H turbine shaft should be just long enough to thread the nut even with the extended tip wheel.

 

[Dsmkauai]

Yes but the 14b compressor wheel and 20g wheel are way diff in sizes. Also I believe the 20g is a super back where the 14b is not. The Chra has to be machined to accept the bigger wheel diameter and not chew it up. And that will also allow it to bolt on correctly. Then all you need is the 20g comp Cover and your good to go bro!

 

[GSX93DSM]

I know one thing is for sure the 20g extended tip won't fit on the 14b turbine shaft.I understand stand now about the maching,

 

[Dsmkauai]

Where is the wheel from?

 

[GST with PSI]

I should really make a FAQ on the bastard 20G. I feel like these questions are coming up a lot. So, I'll give it a shot below.

To address the points the others brought up, as they said, without machine work, you can't put a 20G, or even a 16G wheel on the 14B bearing housing. The base of the compressor wheel is too large. Here's an example of the machining required:

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For the cost of machine work to do the job right, you'd probably be better off acquiring a 16G bearing housing. Look for a blown 16G cheap, you can usually find them floating around.



Shopping list for a bastard 20G:

-Any MHI E316G bearing housing:
Any EvoIII 16G, will work. However, it NEEDS to be a MHI housing. Some of the Chineese knockoff bearing housings have odd sized turbine shafts, which makes finding a rebuild kit and a properly fitting compressor wheel a gamble. Also, they are $hit, so that alone should be reason enough to avoid them.

-20G compressor wheel:
You can buy the super sexy billet wheels with extended tips and all that crap. Just know, you're probably wasting your money. The TD05 turbine just doesn't have the juice to push even the typical cast 6 blade 20G wheel. With that in mind, you likely won't see any of the real gains a nice billet wheel would normally net you. Now, pair that wheel up with lets say, a TD06 turbine, and you've got something. You might see slightly better spool on the TD05 turbine with a billet wheel (depending on the flavor), but taking the extra cost for the billet wheel into consideration, the regular cast wheel is the way to go if you ask me.

-TD05 turbine:
Pretty self explanatory. Make sure it's a legitimate MHI turbine for the reasons already mentioned above.

-7cm^2 turbine housing:
IMO, the 6cm^2 housing is too small, and the 8cm^2 is too large (that includes the 10cm^2 T3 housing). The larger housings will just hurt spool, and any gains you might see up top will be probably be cancelled out by the slower spool time down low. You'll get the best balance of flow and spool in the 7cm housing.

-20G compressor cover:
You can pick up a TD05 compressor cover machined out to accept the 20G wheel. I believe there are some downfiring 20G compressor covers available as well. Just search around and get whatever works for you.

-Rebuild kit:
A rebuild may or may not be required. I've heard it said that the 20G compressor wheel can put larger thrust loads on the turbine shaft and bearings (I have no real world evidence to back this up). As a solution to this, there are multiple rebuild kits out there with "upgraded" thrust components which are larger than the factory components. For these upgraded parts to work, you need machine work done to the 16G bearing housing. Also, some of the aftermarket thrust plates have larger oiling holes, which may change how/where you feed your turbo from. In summary, make sure you know what rebuild kit you're getting, how to assemble the parts in the kit, and how those parts may affect the turbo's operation and lubrication requirements.

Here's a pretty decent video tutorial on the rebuild process:

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[GST with PSI]

I know one thing is for sure the 20g extended tip won't fit on the 14b turbine shaft.I understand stand now about the maching,

The 14B uses the same turbine as the 16G. The 14B bearing housing is what will keep you from using the 20G wheel. Either you have an odd sized Chinese turbine, or an odd sized compressor wheel. There should't be any reason a 20G wheel won't mate to the TD05 turbine.

 

[JusMX141]

I know one thing is for sure the 20g extended tip won't fit on the 14b turbine shaft.I understand stand now about the maching,

It won't fit OLDER 14B shafts with the right-hand threaded nut because the shaft is too short. You shouldn't be using a right-hand threaded shaft on a performance 20G anyway or the nut will come loose.

 

[CrackedDSM]

Oooooh. Interesting. This is why you always message Justin with any and every possible turbo problem you will ever have. Even if he says he's busy, don't take no for an answer. Harass the hell out of him, he doesn't mind a bit. Do you Justin?