Hi, i bought a bunch of parts a few week ago. Came with an oem new (refurbish maybe?) mitsubishi 20g turbo.
Turbo came disassemble, i'm going to put it together with a new rebuild kit and have it balance by a shop.

My question are;

-the compressor housing have 2 bolt screw in the housing(passing thru), Is it Ok or it can cause any restriction? (have a tig welder, can weld to block if its a concern)

-On the compressor housing, there is a tiny hole? like this, its gonna leak, is it for drilling and taping for a vacum nipple? Can i weld it to block the hole?

-On the turbine housing, it still look new (look to have been refurbish, there is an helicoil on the flange and wastegate flap welded) but there is some crack inside, is it still good or no?

Right now i have a small 16g on the car. Was thinking to swap for the 20g if everything is OK. i can used spare part from the s16g if there is something wrong with the 20g (turbine housing).

Yes you can get the holes welded. The bolts are for the internal waste gate actuator mounting. The small hole is the boost source port & would have a nipple pressed into it. It can be tapped for a barb fitting. That compressor wheel is damaged from rubbing on the compressor housing but looks minor & may be salvageable but I would buy a new wheel. The turbine housing is cracking & is only going to crack more but you could run it still. If the turbine wheel is a TD05H (many 20G's are) it would be the same as your S16G turbine wheel & you could assemble this onto your existing S16G turbine housing if you wanted

Edit: Some center cartridges mount the turbine housing with a big c-clip. The center cartridge & turbine housing in your pictures assembly with a v-band. If your S16G turbine housing is a c-clip style minor machining modification is needed on the center cartridge to make the c-clip fit.

1- Put some Teflon tape on the bolts and leave them in. Don't weld up the holes.

2- This was for a boost reference, most likely the wastegate. You can plug it up or use it if you would like. A press fit Barb should have gone there.

3- The cracks will be ok for now. But they won't get better.

I welded the actuator mount holes on my housing & tapped the boost source hole for a barb fitting. I run an external waste gate I did not need the internal waste gate actuator ever. Welding is permanent.

thank you all for the reply!

As a replacement for comp wheel, wich type of wheel should i look? billet? and number/style of blade?

Bock said:

As a replacement for comp wheel, which type of wheel should i look? billet? and number/style of blade?

Click to expand...

This would be up to you & your preferences & what turbine wheel that is. Personally I would get another MHI original Cast wheel especially with a TD05H turbine wheel.

Mounting holes on the cover are for the wastegate actuator on the turbo's original intended application (forklift)...you can leave the bolts in place or weld them closed if you desire.

The small hole in the compressor housing is where a hose nipple would've been pressed in from the factory. Either plug the hole with a bolt or weld it as well.

Turbine housing is fine as long as none of the cracks are through to the exterior of the housing. You can swap the 16G turbine housing in place as long as this turbo uses a TD05H turbine but the 16G wastegate actuator will not fit. If yours has a turbine larger than TD05H then the 16G housing will not fit.

On the stock TD05H turbine a standard cast 20G compressor works fine...if yours has a larger turbine, which it's hard to tell in the photos but I believe it may have a TD06 or 06H, you'll benefit much more from a billet upgrade. On the stock 05H turbine billet will net a small increase in airflow and efficiency but it may not be ideal for everyone and the cost is about 3x or 4x a cast replacement.