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Difference between a/r .48 and a/r .63

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Old 03-28-2004, 03:24 PM   #1
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Default Difference between a/r .48 and a/r .63

When the description of a turbo says say t3/t4 50 trim a/r .48 what does all that mean. What does the trim mean and what does the a/r mean??? thanks in advance
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Old 03-28-2004, 03:45 PM   #2
 
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Default Re: Difference between a/r .48 and a/r .63 (xtremeness101)

It refers to the size of the compressor/turbine housing. The bigger the number the bigger the housing.
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Old 03-28-2004, 03:47 PM   #3
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Default Re: Difference between a/r .48 and a/r .63 (ITSTOCK)

trim is the size of the compressor fins. There's an equation for it. Basically you plug in the lenght of the inducer and exducer and you get the trim.
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Old 03-28-2004, 04:00 PM   #4
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so what is the benefits and disadvantages of a bigger compressor/housing compared to a smaller one
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Old 03-28-2004, 04:02 PM   #5
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Im looking for a quick spooling turbo for only about 12 psi MAX. I will probably run 8 psi daily and 12 psi for high boost. what would be the specs of a turbo that i should look for?

i was told a t3/t4 50 trim but not sure of the a/r
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Old 03-28-2004, 04:08 PM   #6
 
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Default Re: (xtremeness101)

What motor is it going on? I have a Precision SC50 off my totalled d16-T civic for sale. It's a 50 trim turbo with a .60 compressor side and i got the smaller optional .48 exhaust side so it spools pretty good even for a 1.6L sohc.
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Old 03-28-2004, 04:13 PM   #7
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Default Re: Difference between a/r .48 and a/r .63 (xtremeness101)

Quote:
Originally Posted by xtremeness101
When the description of a turbo says say t3/t4 50 trim a/r .48 what does all that mean. What does the trim mean and what does the a/r mean??? thanks in advance
that refers to turbine housing, theres usually 3 stages of wheels to choose from. for turbonetics 1 is smaller diameter, while 2 and 3 are same outer diameter but 3 has larger inducer.

theres a formula to calculate a/r based on your compressor trim. how much whp do you plan to have, what type of engine and redline.
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Old 03-28-2004, 04:21 PM   #8
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sorry i have a 1995 gsr 1.8 L. im planning around 250 whp
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Old 03-28-2004, 04:37 PM   #9
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Default Re: (xtremeness101)

for 250whp, you'd be good with .48 a/r. i'm running T04B 50 trim - .48 a/r stage 2 wheel, theres no concern with top end, although it peaks at redline at ~260whp, if i'm to run closer to 300-325whp, - it would probably peak a bit lower.. around 7500-8000rpm. the advantage is having torque come in much earlier and quicker response.
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Old 03-28-2004, 04:50 PM   #10
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Default Re: (vtec.dc2)

thats some good advice thank you
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Old 03-28-2004, 07:45 PM   #11
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What do you think about this turbo for my setup:
http://cgi.ebay.com/ebaymotors...50972
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Old 03-28-2004, 08:01 PM   #12
 
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PM'ed u
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