GT4202 on LQ4? 1.15 or 1.25?
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GT4202 on LQ4? 1.15 or 1.25?
Just found a great deal on T4 or T6 new Garrett GT4202 turbo. I have an LQ4 (6.0) going in a Foxbody. I believe the turbo measures 74mm comp, 88 turbine. It comes standard T6 flange, or for $200 more you can get a T4 with 1.15ar or 1.25.
I'm thinking of running the T4 with 1.15 ar. My question is.. will this end up being too small for a stock 6.0? Should I get the larger ar turbine housing? My goal is 650-700 rwhp through a 4l80e.
I'm thinking of running the T4 with 1.15 ar. My question is.. will this end up being too small for a stock 6.0? Should I get the larger ar turbine housing? My goal is 650-700 rwhp through a 4l80e.
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Here are the dimensions for the GT4202 I pulled off the website:
Compressor Specs:
Inducer = 74.3mm
Exducer = 102.3mm
Trim = 53
AR = 0.60
Turbine Specs:
Wheel dia = 82mm
Trim = 84
AR = 1.01, 1.15, 1.28, 1.44
These specs look very close to a standard S475 if I'm looking at it right...? Looks like most S475 are 74.7mm compressor inducer, 100mm inducer, 88?mm exhaust wheel, available in similar T4 or T6 housings.
Compressor Specs:
Inducer = 74.3mm
Exducer = 102.3mm
Trim = 53
AR = 0.60
Turbine Specs:
Wheel dia = 82mm
Trim = 84
AR = 1.01, 1.15, 1.28, 1.44
These specs look very close to a standard S475 if I'm looking at it right...? Looks like most S475 are 74.7mm compressor inducer, 100mm inducer, 88?mm exhaust wheel, available in similar T4 or T6 housings.
#7
TECH Apprentice
This is not me questioning your expertise, but isn't it pressure that drives the turbine in the first place? Wouldn't added pressure decrease spool time, but then obviously make less power up top? What you said seems backwards, but then again, you're the cam//turbo expert haha
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#8
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Exhaust pressure drives the turbine. Back pressure is pretty much excess pressure building up when you are creating more exhaust pressure than the turbo can effectively use. A bigger exhaust housing can use more exhaust pressure before it starts to "pile up" creating back pressure.
Having a properly matched system is what decreases spool time and makes power.
Having a properly matched system is what decreases spool time and makes power.