Where can I find specs for rebuilding turbochargers? Specifically the stock one, but is there some sort of database for all (or most)?

By specs, I mean stuff like clearances, torque values, runouts, etc. Not trim, A/R, etc.

I was fiddling around with an old turbine shaft piston ring seal and a bearing housing, and decided that I'd see how much gap there was. So just like when rebuilding a piston engine, you have to gap the rings by putting them in the cylinders one at a time and measure the ring gap with a feeler gauge. I found that the turbine ring seal had about .004" of gap. That's great, but with no spec to compare it to I have no clue if it's good or not.

 

What kind of turbo?

Distributors and rebuilders should have this information. It all comes from the manufacturer.

 

I have a S5/TO4B hybrid, so everything should be the same since it's only the TO4B compressor on it. The only difference is that it has a 360 thrust bearing and dynamic compressor seal.

 

im also curious on this, i would def like to know what the clearance between the wheels and housings are.

 

Thats something you would need to go to the builder for. Manufacturer specs will be different from a custom unit.

For example, if you have a Garrett GT35R and you send it to Precision for a billet compressor, they have their own specs for clearance between the wheel and housing.

 

I don't know who built it. I bought it used from someone who didn't know who made it either. Possibly a panspeed or knightsports was what he said, but nobody really knows.

I found something from GPopShop. They apparently gave me a "how-to" sheet for rebuilding a garrett T3. I found it while rummaging through some of my stuff today.

Compressor Wheel
- Bore diameter .2498 - .2501
Backplate
- Piston ring bore diameter .4995 - .5005
Bearing Housing
- Bearing bore diameter .6220 - .6223
- Piston ring bore diameter .709 - .711
Turbine Wheel
-Journal Diameter .3997 - .4000
-Seal hub diameter .679 - .684
-Piston ring groove diameter .567 - .572
-Piston ring groove width .0645 - .0685
-Eccentricity .0005
Thrust Collar
-Bore diameter .2501 .2505
-Thrust bearing groove width .1740 - .1748
-Thrust bearing groove diamter .370 - .380
-Piston ring groove width .638 - .653
-Piston ring groove diamter .405 - .410
Clearance
-Radial bearing clearance .0030 - .0065
-Axial end play .0005 - .0040
Bolt torque specs
-Backplate 75 - 90 in/lbs
-Turbine housing 164 - 181 in/lbs
-Compressor housing 145- 165 in/lbs
-Shaft nut 28 in/lbs + 90 degrees



That's straight from GPopShop for the T3/T4 rebuild kit. I don't have anything for the piston ring gap, but I guess if the bore diameter and piston ring groove diameter fall within spec, then the ring won't allow any leakage.