What size turbo is adequate for the 3800? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-19-2006, 04:53 PM   #1
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Default What size turbo is adequate for the 3800?

Just curious.
I was looking on ebay and a Garrett GT42 is like $296 BIN and they're stating it is the right size for a RX7 or Supra. I'm not sure of the size of the RX7 engine, but the Supra has a 3.0, so although it'd be a little bit small it states that the turbo is good for 650 HP in a RX7. I'm curious if this turbo could be good for 400 in the 3800.
If not what would?
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Old 08-19-2006, 06:25 PM   #2
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A GT42 is a LARGE turbo. If you're looking for a car to drive on the street you don't want a GT42. On ATP'* site their GT42R'* have 850hp and 1000hp turbine options. You should be looking at GT35 and smaller turbo'*. For a 3800 powered car I think I'd probably go GT3076R for a 400hp application but thats just me.

http://www.atpturbo.com/Merchant2/me...egory_Code=GRT

It is a $2300 turbo though.
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Old 08-20-2006, 12:57 AM   #3
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There'* a dude with an XR4Ti, and he mounted a Caterpillar diesel turbo he found...
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Old 08-20-2006, 01:13 AM   #4
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Quote:
Originally Posted by F14CRAZY
There'* a dude with an XR4Ti, and he mounted a Caterpillar diesel turbo he found...
That would take eons to spool... unless it was from some tiny skid steer, but it'* still not a great idea.
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Old 08-20-2006, 01:49 PM   #5
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The fastest way to get an answer would be to find out what the Buick Grand Nationals are running.

An other option is go get Corky Bell'* book. It will explain housing designs, trims, how to read compressor maps...
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Old 08-20-2006, 02:30 PM   #6
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A friend of mine sized his turbo using this calculator:
http://www.not2fast.com/turbo/glossary/turbo_calc.shtml
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Old 08-20-2006, 05:35 PM   #7
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Quote:
Originally Posted by Greyhare
The fastest way to get an answer would be to find out what the Buick Grand Nationals are running.

An other option is go get Corky Bell'* book. It will explain housing designs, trims, how to read compressor maps...
GN would be a good base, but that older, and simpler engine flows better then a 3800, something to consider.
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Old 08-21-2006, 05:35 PM   #8
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Ok, not really about size, but does a turbo have to be mounted level? Every one I've seen, whether it'* a diesel or a gas, the turbo has been mounted horizontal. I'm guessing that'* so it get'* oiled correctly?
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