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Gt42 Questions

Old 08-14-2005, 12:11 PM
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I'm curious about this particular turbo; I am not well educated on turbo specs, etc. can anyone describe what to expect for the powerband on a large streetported engine with a 42 with these specs:

56 Trim Compressor Wheel

2.770 in. (70mm) Inducer

3.700 in. (94mm) Major



0.66 A/R Comp. Housing

4" Inlet, 2.5" Outlet



84 Trim Turbine Wheel

3.220 in. (82mm) Major

2.947 in. (75mm) Exducer



1.12 A/R Turbine Housing

Large Frame Inlet



If set for 10 psi, what would one expect for output? Would this need different fuel from, say, a T04 or other turbo? Like I said, I'm not well versed in turbo terminology so any help would be appreciated. This is my first turbo project...I cross-posted this at the other forum...
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Old 08-14-2005, 03:45 PM
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http://www.lextreme.com/GT.html



GT42 is TOO big for just about everything rotary except maybe a large port 20b. That is unless you have a full drag car.
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Old 08-14-2005, 03:51 PM
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Old 08-14-2005, 06:40 PM
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My overall HP expectations are only in the 3-350 range. I want to shoot for reliability and longevity as much as possible.



That being said, what puts me in that range? I definitely look for more midrange than sheer top end. I understand the need for fuel, etc. but not matching the turbo.
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Old 08-14-2005, 06:45 PM
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I think an Apex'i RX6 would be good for you...but then again I'm an idiot when it comes to turbos.
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Old 08-14-2005, 06:57 PM
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yeah an rx6 would work really well, or a to4e
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Old 08-14-2005, 09:39 PM
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60-1 with a .81 A/R is a great street turbo and would be good for your power range easy. In the GT series the 28 or 30 would also be about what you are looking for. With an A/R of .8x-.9x, you could go a smaller A/R and have a quicker spool you just need to make sure you have a large enough wastegate to avoid boost creep.



If you really want to know what would work well for you call Garret or Turbonetics or go talk to a local turbo shop. They would be more than willing to help you size a turbo.
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Old 08-14-2005, 09:55 PM
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Yeah, nothing beats custom sizing for the application.
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Old 08-16-2005, 10:04 PM
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[quote name='psyclo' date='Aug 14 2005, 08:39 PM']If you really want to know what would work well for you call Garret or Turbonetics or go talk to a local turbo shop. They would be more than willing to help you size a turbo.

[snapback]748527[/snapback]

[/quote]



<---"Wyoming" Not much in the way of turbo shops. I will try calling the ones you've listed, thanks.
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Old 08-20-2005, 01:39 AM
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Yeah a gt42 is much too large for your application. It is better suited for a BP or PP. The three turbos listed are better suited for what you want. They will spool quicker, and are also much more efficient at 10psi than a GT42 would be.



- Hand
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