T3/T4 Question

[espinelli]

I'm consider purchasing a used t3/t4 turbo from someone. Unfortunetly this person does not know what the specs are. Basically, its a really good deal and I don't think I'm going to be able to pass up this opportunity. I need help identifing and figure out the specs for this turbo.

Here is what I know. Looking down the mouth of the turbine side it looks like its a .48ar. I'm okay with that. I need help determining the compressor side trim. I believe its a T04E housing, 3 inch opening and 2 inch discharge...compressor side is marked with .70ar

Given that info. How would one determine the size of the trim for this turbo? Is it a 48, 50, 54, 57, 60 etc.? I know I've provided limited information and I apologize for that. So which trim or trims do you think could possibly match up to the info provided?

 

[boostedinaz]

It could be all of them. The only way to know for sure is to take the cover off and measure the wheel inside. I am not sure on the specs for each wheel so I cant help you there but I am sure that someone will chime in or give a link.

Michael

 

[espinelli]

It could be all of them. The only way to know for sure is to take the cover off and measure the wheel inside. I am not sure on the specs for each wheel so I cant help you there but I am sure that someone will chime in or give a link.

Michael

Thanks Michael. Would I cause any problems by removing the compressor housing in order to measure the wheel? My concern is that if I remove the compressor housing I could have a potential boost leak issue and after doing so would the turbo have to be rebalanced?

 

[kpt4321]

0.48 is on the small side for a turbine housing.

You can take the compressor cover off with no problems.

 

[espinelli]

0.48 is on the small side for a turbine housing.

You can take the compressor cover off with no problems.

Thanks kpt4321

Will I need to replace a gasket when taking off the compressor housing? Do I need to seal it with something to prevent boost leak?

Given that its a .48 hot side. Would you recommend a .63 or larger?

I prefer that the turbo have a relatively fast spool. Given that its a .48 hotside, I'm not expecting the compressor side to have a huge trim.

 

[espinelli]

anyone else have any thoughts

 

[kpt4321]

The size of the turbine housing doesn't really matter compared to the size of the compressor. In addition, all of the T4 compressors that are likely to be in there (46/50/54/57/60/60-1) are pretty damned big wheels.

If you're going to use a compressor wheel that big, you're going to want a bigger turbine housing. If you want a smaller turbine housing because lag is a problem, then you should look into buying a smaller turbo like a 16g.

 

[FearceDSM]

I just went through this with a Turbonetics T3/TO4B H-3 that a friend gave me. If you are looking to swap out for a larger turbine housing, measure the turbine wheel and see what stage wheel you have. From the information I gathered, .48 is almost equivelant to a Mitsu 7cm turbine housing. You will get less lag, but you sacrifice top end. I just swapped out my turbine housing for the Bulleseye turbine housing to make my turbo a direct bolt on set up.