20G td06 - can i swap in a 16g hotside?

[Spades]

OK here is the deal, I have a 20G td06 setup for an external gate, I was wondering if I could just swap over the turbine wheel and housing from a 16G (with internal wastegate of course)? Would that make it a TD05h-20G turbo? Are there any differences in the center section? Id love to keep the turbo but I really dont want the external setup

 

[fwdeclipse]

Yeah the 16g hotside will work just fine. The center section also is the same so it should work for you. Is the turbine wheel in it now a td06. If so I would not change out for the smaller wheel. If you do then you should have it clipped to help with top end flow. Mine is clipped 15* and its not very laggy at all.

 

[turboking15]

if you change out the wheels you will also have to get the turbo re-balanced. you would be better off finding an internal td06 turbine housing.

 

[fwdeclipse]

If they are mitsu wheels you should not need to rebalance them. Maybe jsmux will chime in and confirm this but this is what I understood. I was under the impression if you werent making a frank or mix matching wheels you dont have to.

 

[aero_sallee]

THe TDO6H 20g has much more potential than a 5h variant. If you really want to cripple the hotside flow of that one, just sell the 6h and buy another used 5h. You should be able to get more for the 6h since they are less common, and a much better match for the compressor.

 

[Spades]

Is the turbine wheel in it now a td06. If so I would not change out for the smaller wheel.

Are you saying I can just swap the td05h housing and leave the td06 turbine wheel? The physical dimension is different and would interfere with the smaller housing wouldnt it?

THe TDO6H 20g has much more potential than a 5h variant. If you really want to cripple the hotside flow of that one, just sell the 6h and buy another used 5h. You should be able to get more for the 6h since they are less common, and a much better match for the compressor.

I dont have a td06h, i have the td06. I almost had it sold couple weeks ago but the buyer said he wanted a 5h or 6h, and of course I had the one he didnt want

 

[JusMX141]

OK here is the deal, I have a 20G td06 setup for an external gate, I was wondering if I could just swap over the turbine wheel and housing from a 16G (with internal wastegate of course)? Would that make it a TD05h-20G turbo? Are there any differences in the center section? Id love to keep the turbo but I really dont want the external setup

The turbine wheels must be the same (TD05H turbine to a TD05H housing, TD06 turbine to a TD06 housing, TD06H turbine to a TD06H housing) or what you're planning on doing will not fly. Sometimes folks refer to 20G's as their compressor housing size not realizing that there are 3 different turbine possibilities.

As far as balance is concerned; it's my understanding that all Mitsubishi journal-bearing turbos are component-balanced from the factory, meaning that the compressor wheel and turbine assemblies are balanced individually, therefore their alignment upon installation doesn't matter. I've been assembling turbos under this assumption for years and have never had a single failure....even with turbos installed on my own cars.

 

[aero_sallee]

I dont have a td06h, i have the td06. I almost had it sold couple weeks ago but the buyer said he wanted a 5h or 6h, and of course I had the one he didnt want

Reading comprehension > me

 

[Steve93Talon]

The turbine wheels must be the same (TD05H turbine to a TD05H housing, TD06 turbine to a TD06 housing, TD06H turbine to a TD06H housing) or what you're planning on doing will not fly. Sometimes folks refer to 20G's as their compressor housing size not realizing that there are 3 different turbine possibilities.

Read that very carefully. Your "TD06" 20g may very well have a TD05H turbine wheel.

 

[Spades]

Read that very carefully. Your "TD06" 20g may very well have a TD05H turbine wheel.

How so? I dont see what you're trying to say

 

[JusMX141]

A TD06 20G (meaning the size of the compressor housing) has the possibility of having a TD05H, TD06, or TD06H turbine wheel on the hot side. About 70% of these turbos have the TD05H turbine wheel, which would mean the 16G exhaust housing would fit.

Post pics of the turbo with the exhaust housing off if you want me to tell you what turbine it has.

 

[Spades]

A TD06 20G (meaning the size of the compressor housing) has the possibility of having a TD05H, TD06, or TD06H turbine wheel on the hot side. About 70% of these turbos have the TD05H turbine wheel, which would mean the 16G exhaust housing would fit.

Doesnt that conflict with what you just said here?

The turbine wheels must be the same (TD05H turbine to a TD05H housing, TD06 turbine to a TD06 housing, TD06H turbine to a TD06H housing) or what you're planning on doing will not fly.

Here is a pic

 

[JusMX141]

That's NOT a TD05H wheel, so a 16G turbine housing <b>will not</b> fit.

To determine if it's a TD06 or a TD06H, you'll probably need a more accurate measuring device than a tape measure:

TD06 = 2.175 exducer O.D. , 2.560 inducer O.D.
TD06H = 2.315 exducer O.D. , 2.650 inducer O.D.

 

[Spades]

I know its NOT a td05h wheel, I already know that I have a td06, my topic title was td06 20G. And i wanted to know if I could swap a 16g turbine wheel and housing (td05h)

Steve93Talon is the one that said that I "may" have a td05h

 

[JusMX141]

That's fine- I was just expressing that many guys don't realize what turbine their 20G really has. Apparently I got caught up in reading everyone else's posts and missed the point of the question.

Yes you can swap the TD05H turbine and housing onto it, and you'll gain a bit of spool time at the cost of some top end pull. We ran an internally-gated TD05H 20G on my buddy's '95 TSi AWD for one summer and hit really hard and pulled like crazy in the mid....WAY more than a 16G. It was an EXCELLENT street turbo. Of course, on his quest for more power, he found a good deal on an FP Green and the 20G is long gone.

I would recommend a 15 degree clip to the TD05H turbine if you're planning on running much over 18psi. Most turbo shops charge $75-$100 for a clip and a rebalance.

 

[Spades]

What do you think of the stock 31mm wastegate flapper from a S16g together with my 20G? Im targeting around 18-21 psi, would it be able to control the boost properly?

 

[JusMX141]

Boost control was the one issue we ran into with the 20G that was formerly on my buddy's 2G.

We had it swapped into an EvoIII 16G exhaust housing because all the bolts were trying to break off in the housing when we went to remove the EvoIII to install the 20G. It was my bright idea to leave the exhaust housing attached and remove the EvoIII at the v-band and install the 20G in it's place. The EvoIII exhaust housing had a 31mm flapper.

All worked well at 18psi....but once he upped it to 22psi for the track it couldn't keep it steady. I guess the increased airflow couldn't be handled by such a small wastegate. It started spiking to 25psi then falling to 18 before it settled at 21 or 22 to redline. I tried shimming the wastegate; even removing preload didn't help. The biggest problem we ran into was spark blowout when the boost spiked to 25psi. It was a huge problem....we solved it temporarily by narrowing the plug gap to .024" but eventually he bought coil-on-plug and the blowout was a thing of the past.

I knew the wastegate hole and flapper were too small, I just didn't want to change it while it was on the car because I knew I'd snap all 4 flange bolts if I tried to remove the turbo to install a bigger flapper. This was another reason he wanted to upgrade the turbo....because of the poor boost control.

The FP Green has a 34mm flapper and it's currently holding boost rock-steady to redline. No spikes, no drops. FP also does a mod to the throat of the turbine housing that sort-of directs airflow toward the wastegate hole....I don't have a pic of the FP Green because it's on the car, but I recently ported a 20G in a similar manner:

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You can see how the uppermost portion of the housing is "D" shaped, and you can see how there's a little shelf of the wastegate passage sticking out. This is an exact copy of how FP ported the housing on his Green....and it holds boost like crazy.