Compressor Wheel Trim?

[eleclipse99]

ok guys i have a garrett turbo and i need to know the compressor wheel trim and whats the compressor cover?

it has a 2.75" compressor inlet
and 2" compressor outlet

i want to know if this is a 57 trim or a 60 trim? with compressor B, E, or S,

this is the turbo

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thanks guys for the help!

 

[turboglenn]

Those measurements show it being a to4b H trim, that's from an older turbonetics catalogue but from a time that they shared basically all the same components in the t3/t4 hybrid family

A 57 trim would have more swept back blades on the major inducers, a slight curving to them before the tip kinda. Now some say the to4b all had the odd 7 blade combo but i've seen them come in all sorts and forms dependiong if it was an actual garrett or turbonetics garrett clone part.

The 2.75 major diameter is what is making me take this shot at what you're running, the only to4 series wheels running a major diameter of 2.750 are the "H", "V" , "S" and T5/6 wheels (all being t04b wheels) the rest of the wheels in the to4 family (both E and B series have major diamteters of either 2.950 or 3.0")

the inducer or minor size can vary depending on how you hold the calipers but the measurement of 2.299 comes closest to the 2.298 spec of the "H" trim wheel.. the 60trim had a minor wheel size of 2.290 but the major was still up in the 2.950 area exluding you from that.

So all in all i think it's a t3/to4b "H" trim turbo (the compressor housing is to4b as well), the t04e would have a 3" inlet and be larger in diameter as well. Overall that's not a bad turbo, although laggy and sometimes possible to surge quite a bit on a 4g63 on the highway but all these issues can be tuned out with the ECU or cam timing as i've dealt with them first hand when i ran a 57 trim (this turbo's mapshows similar charchteristics as the 57 trim) but hell it's rated for a good 49 lb/min but the problem with this turbo on a smaller engine is that it doesn't like being ran past about 24-25psi before it's no where near efficient any more.

you could probably run it and push the 22-24psi envelope and expect about 400-430whp out of it with a good tune and a properly matched setup of the rest of the hardware but that would be pushing it...

I'm sure justin will chime in with some thoughts if not first hand experience with that exact wheel on a DSM though so i could be wrong on my thoughts as to how it will react, i'm just going off my experiences with similar turbos the 4g63 and what i would expect that one to do from it's compressor map.

 

[JusMX141]

Balls, Glenn.

To go a little further with Glenn's info, that's a .70 a/r T04B cover, which is the largest offered in the T04B lineup. A higher a/r number on a compressor cover means more airflow.

Here's a map and a decent paragraph on the H-Trim's potential from another site; the highest efficiency island is definitely in the lower boost levels:

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T04B H-trim

Let's look at the compressor map that we posted first: the H-trim. The "box" does run into the upper half of the top-most efficiency plateau (74%). In fact, 3/4th's of the box lands within the 70%+ efficiency plateaus - not bad. At it's best efficiency, 74%, boost levels are within the 1.40 to 2.10 pressure ratios - between 6psi and 17psi. So, this turbo was designed for lower boost pressures, as it's best efficiency is centered around 10psi. We know from experience, that this H-trim makes about 300 to 350 hp to the wheels on a DynoJet with very good boost response. If you're going to keep boost levels relatively low around 15psi, this is a very good turbo up to about 350hp at the wheels. The box is completely away from the surge limit line. This compressor wheel is one step down from the 60-1.

 

[eleclipse99]

wow! that's what i'm talking about, you guys thanks guys for the info, that helps me alot

 

[eleclipse99]

ok, i have one more question, can i put a anti surge compressor housing on it?

 

[eclipsalon]

turbo guru^^^