Need help understanding turbo specs(Searched and no results)

[marleyskater420]

Hey, I've been reading these forums for a few months now and have learned things here and there, and recently I have tried to start understanding turbo's and I have read about 6 other tutorial sites and whatnot explaining how they work,but I could not get what the specs on the turbo mean. For example

A Garrett GT35r 56 trim=

FULL STEEL BALLBEARING CENTER SECTION

compressor specs: TO4S housing -How does this affect the turbo, please elaborate other than "it changes how fast it spools up" Please incule other refrence sizes and their spool-up characteristics.

TO4S: .70a/r -I know the a/r has to do with the housing?and how fast the turbo will spool up?

compressor wheel trim: 56 trim wheel - please elaborate as with the others

compressor flow: 60 LB/MIN -Does this mean that it will flow 60lbs of pressure into the engine per minute?I have no idea what this is..

turbine specs:T3 -is that the turbine itself?

.63 a/r, .82 a/r or 1.06 a/r -available a/r's..I got that

84 trim wheel -Does this mean the turbine wheel is 84 trim?

Water cooled and oil lubricated bearing housing standard.

full steel ball bearing cartridge, not ceramic...

So I would just like it if someone,out of the kindness of their heart would explain this stuff to me. Im not just coming here asking blindly, I have done the best research I could find on turbos, and I guess I just havent looked long and hard enough though.

Your explanations are greatly appreciated,

-Tyler

[Nismo_Freak]

compressor specs: TO4S housing -How does this affect the turbo, please elaborate other than "it changes how fast it spools up" Please incule other refrence sizes and their spool-up characteristics.

T04S is the compressor's class. Most GT series turbos feature a T04S compressor, which is generally more efficient than the T04E series. Spool up times have little bearing on this side of the turbo, generally most effective spool up happens exhaust side.

TO4S: .70a/r -I know the a/r has to do with the housing?and how fast the turbo will spool up?

T04S is the housing's identification... a sort of "family" so to speak. A T04S has a 4" inlet and a 2.5" outlet, and usually lends towards greater efficiency and greater flow than a comparable T04E housing.

The .70 a/r is a ratio of area / radius for the housing. The larger the a/r the larger the area withen the housing, and thus the flow. Lag also can be present on larger a/rs on the compressor side, but it is affected moreso on the exhaust side.

compressor flow: 60 LB/MIN -Does this mean that it will flow 60lbs of pressure into the engine per minute?I have no idea what this is..

This is a peak flow rating of the compressor, you can deduce rough power output from the airflow.

turbine specs:T3 -is that the turbine itself?

.63 a/r, .82 a/r or 1.06 a/r -available a/r's..I got that

84 trim wheel -Does this mean the turbine wheel is 84 trim?

T3 is indeed the turbine class itself.

Yes, 84 trim means the turbine wheel is an 84 trim.

I would suggest a .82 a/r with at least a 38mm Tial wastegate (40mm would be ideal, however is significantly more expensive).

Water cooled and oil lubricated bearing housing standard.

full steel ball bearing cartridge, not ceramic...

Water cooled = good.

Full steel ball bearing = good for longevity, not good for spool up. Ceramic ball bearings will yield faster spool up but have less resistance to shaft ocellations and movement.

Spool-up on an SR would occure after 4000 rpms with this large of a turbo.

[marleyskater420]

T04S is the compressor's class. Most GT series turbos feature a T04S compressor, which is generally more efficient than the T04E series. Spool up times have little bearing on this side of the turbo, generally most effective spool up happens exhaust side.



T04S is the housing's identification... a sort of "family" so to speak. A T04S has a 4" inlet and a 2.5" outlet, and usually lends towards greater efficiency and greater flow than a comparable T04E housing.

The .70 a/r is a ratio of area / radius for the housing. The larger the a/r the larger the area withen the housing, and thus the flow. Lag also can be present on larger a/rs on the compressor side, but it is affected moreso on the exhaust side. What is a large a/r?

This is a peak flow rating of the compressor, you can deduce rough power output from the airflow. How so?What kind of figures can you deduce from certain lbs/per minute?



T3 is indeed the turbine class itself. What are the different classes of turbines?

Yes, 84 trim means the turbine wheel is an 84 trim.

I would suggest a .82 a/r with at least a 38mm Tial wastegate (40mm would be ideal, however is significantly more expensive). How do I determine what size the wastegate is? Is that on the turbo description itself?

Water cooled = good.

Full steel ball bearing = good for longevity, not good for spool up. Ceramic ball bearings will yield faster spool up but have less resistance to shaft ocellations and movement. So full steel would be a better long term decision?

Spool-up on an SR would occure after 4000 rpms with this large of a turbo.

Thanks for the reply.

[marleyskater420]

T04S is the compressor's class. Most GT series turbos feature a T04S compressor, which is generally more efficient than the T04E series. Spool up times have little bearing on this side of the turbo, generally most effective spool up happens exhaust side.



T04S is the housing's identification... a sort of "family" so to speak. A T04S has a 4" inlet and a 2.5" outlet, and usually lends towards greater efficiency and greater flow than a comparable T04E housing.

The .70 a/r is a ratio of area / radius for the housing. The larger the a/r the larger the area withen the housing, and thus the flow. Lag also can be present on larger a/rs on the compressor side, but it is affected moreso on the exhaust side.

What is a large a/r?

This is a peak flow rating of the compressor, you can deduce rough power output from the airflow.

How so?What kind of figures can you deduce from certain lbs/per minute?



T3 is indeed the turbine class itself. What are the different classes of turbines?

Yes, 84 trim means the turbine wheel is an 84 trim.

I would suggest a .82 a/r with at least a 38mm Tial wastegate (40mm would be ideal, however is significantly more expensive).

How do I determine what size the wastegate is? Is that on the turbo description itself?

Water cooled = good.

Full steel ball bearing = good for longevity, not good for spool up. Ceramic ball bearings will yield faster spool up but have less resistance to shaft ocellations and movement.

So full steel would be a better long term decision?

Spool-up on an SR would occure after 4000 rpms with this large of a turbo.

I tried to edit my post and in return 2x posted....grrr@ the inconvinence.

I responded to your answers within the post, but I couldnt figure out how to change the font without screwing up. My responses are spaced apart from your answers if that helps.