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Old 02-09-2011 | 11:11 AM
  #21  
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kbracing96
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Originally Posted by warsteiner
I'm trying to make this same decision... i can't decide whether to stay streetable with something like a PT76 or change my flange to a T6 and go for the S475 or GT88 for all out power. I have 2.5" discharge piping... is that gonna be too small for a large frame turbo like that?
Stock LQ4 for the moment with a 72mm frt mount. Circle D 258mm 2B in a 4L80E. Possibly going to a 408 LSX soon.
Both S475 and GT88 need a 4" down pipe. 2 1/2" would be WAY to small. I don't build anything with smaller then a 3" and that's only on T70's and some T76's.
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Old 02-09-2011 | 11:39 AM
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Originally Posted by bud8fan
what ever you get dont choke down the exhaust side with a .98 ar....go with something bigger.
A/R is only a ratio, not a size. HUGE difference between a .96 a/r like you have on your MP T76 and a .96 a/r on a PT88. The turbine wheel is much bigger on the PT-88 letting it flow a lot more exhaust gas See pic below, both are T4 .96 a/r's...



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Old 02-10-2011 | 12:23 AM
  #23  
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that looks like an easy upgrade. that thing trumps the tc78 big time.
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Old 02-10-2011 | 08:11 PM
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well im going with the gt91 the guys over at forced inductions were good dealing with so thats what he talked me into
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Old 02-10-2011 | 08:42 PM
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Originally Posted by teamblackandred
well im going with the gt91 the guys over at forced inductions were good dealing with so thats what he talked me into
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