pampadori wrote:after some research, i found out some info on the gt25r...the part number listed above for the gt25r and gt28r are for the baby turbo gt25 and gt28 models.
they are only good to those hp claims mentioned in the same post.
but garrett also makes the gt25r with the much larger to4s compressor housing and wheels to fit them. these wheels flow the 44lbs/min mattback was mentioning. these are alo more expensive.
this gt25r is rated at 380-400hp....705330-0001this gt25r is rated at 400-440hp....705330-0002
the only difference is that 0002 has a .86 a/r on the turbine side. the 0001 is a .64 a/r. the wheels are identical, as is the compressor housing. (to4s. wheel flow 44lbs/min) c.h.r.a. is the same aswell.
btw, the to4s housing will probably not fit on the stock manifold. it will more then likely hit the manifold on the cyl1 and 2 runners.the exhaust side inlet flange is a t2. but the outlet may or may not be the same. the pics i saw did show a internal gate with a 5 bolt outlet. suggesting that this will be the same, or very very close.
i hope i helped some people out. the gt25r seems to be the name of many different turbos. so i suggest if anyone gets on of these, they order it and research it by part number.shaun
The GT25R iwth the .86 fits under the stock manifold.
