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what to expect from a T3/T04 .50 A/R 48 trim with a '63 turbine housing (trim 74.2) on my 2.9 stroker?


A to Z

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Hello!

 

Since my turbo project is going well, I wanted to ask if any of you have any thoughts as to what I can expect from my T3/T04 turbo with  .50 A/R 48 trim) with a .63 turbine housing (trim 74.2) on my 2.9 stroker?  Since I like quick spool, I think a turbine with more vanes might be nice.

 

Thoughts? Thanks in advance.

 

Edited by A to Z
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I don't think you have your trim specs right.

 

Trims are usually whole numbers.  The 74.2 just so happens to be the measure of one particular turbo e wheel's inducer diameter - and it is for a GT3076 turbo.

 

A 50 trim compressor section is one of the just right compressors for our size engines in the normal journal T3/T4 series turbos.

 

If you want lower spool the the T350 turbine (stage III) would be perfect.  If you want more top end power then go with a stage V turbine.

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17 hours ago, Brad-ManQ45 said:

I don't think you have your trim specs right.

 

Trims are usually whole numbers.  The 74.2 just so happens to be the measure of one particular turbo e wheel's inducer diameter - and it is for a GT3076 turbo.

 

A 50 trim compressor section is one of the just right compressors for our size engines in the normal journal T3/T4 series turbos.

 

If you want lower spool the the T350 turbine (stage III) would be perfect.  If you want more top end power then go with a stage V turbine.

 

here are my T3/T04 Turbo specifics:
Turbine Side:
Turbine Trim: 74.2
Turbine A/R: 0.63
Turbine Inducer: 64.8mm
Turbine Exducer: 55.8mm
Turbine exhaust outlet : 79mm
Turbine exhaust inlet: 44.7mm(length)/85.8mm(width)
Compressor Side:
Compressor Trim: 48.1
Compressor A/R: 0.5
Compressor Inducer: 52.7mm
Compressor Exducer: 76mm
Compressor outlet:78 mm
Compressor inlet:51.5 mm

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It'll be choked off a bit and start to spool around 2800 with full spool around 3200(estimated). Stage III turbine is like a 68 mm inducer and 62.35 mm exducer.

 

The compressor wheel you are describing is awfully close to the 50 trim T04E and is a good match for the engine if not turning over 6k.

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I don't really like taking her over 5000 RPM really anyway.  The cam is stock, and its a stroker with all the power where I like it.... mid range.  If this is going to give me that type of power, frankly I couldn't ask for more. :)  Its a high compression engine (11.5 to 1), and this is meant to just lightly turbocharge it.  I am at 6035 ft. elevation, so basically lose a point and a half on the thin air.  This is a Draw through setup on an old crown turbo kit that has been updated.  I have a snow performance water/methanol kit with 2 nozzles to cool it down and give it a bit more octane....and a J&S Safeguard Knock sensor with individual cylinder timing pull.  It's mainly for looks and a little bit extra push....it's a cruiser. :)

 

Edited by A to Z
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