T3 60 with 0.42 A/R compressor housing - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-04-2007, 11:42 PM   #1
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Default T3 60 with 0.42 A/R compressor housing

Hi all,

What are the differences between a T3 60trim with a 0.42 A/R compressor housing and a T3 60 trim with a 0.60 A/R compressor housing? Turbines are the same...0.48 A/R.
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Old 10-05-2007, 12:04 AM   #2
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do a simple search with keyword 0.42 A/R or 0.60 A/R adn read everything braineack ever wrote...
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Old 10-05-2007, 09:45 AM   #3
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Quote:
Originally Posted by hksmx5 View Post
Hi all,

What are the differences between a T3 60trim with a 0.42 A/R compressor housing and a T3 60 trim with a 0.60 A/R compressor housing? Turbines are the same...0.48 A/R.


nothing. you will never feel or be able to log a difference, if everything else is truly equal.

because it's on the compressor side, the a/r doesn't effect anything, boosted air will travel just a fast to the TB through a small a/r or large a/r.

the turbine's A/R on the other hand...
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Old 10-05-2007, 11:42 AM   #4
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The power output will not be reduced by using a smaller A/R compressor housing?
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Old 10-05-2007, 11:48 AM   #5
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no, compressor output is insensitive to changes in A/R.
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Old 10-05-2007, 01:32 PM   #6
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The main advantage to a larger AR compressor is it looks cool having a 4" inlet and a 2.5" outlet vs. having a 2.25" in and a 2" out. (#s pulled from ***)
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Old 10-05-2007, 09:42 PM   #7
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ok so like the T3s from the 85 turbo thunder bird, the automatic uses a .60/.48 A/R and the manuel uses .60/.63A/R does this mean i can use either, with out worrying about additional lag.
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Old 10-06-2007, 03:09 AM   #8
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no, the turbine is VERY senstive to A/R changes.

for a 1.6L you'd want the .48 like me. at 200rwhp i wasnt seeing any torque dropping off due to it choking.
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