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View Full Version : External wastegate question. help!

RED_P1LL
09-03-2011, 11:34 AM
Ok I just got my 240 and it has a gt2871r .86 turbo with 740cc injectors, but I was thinking about going external wastegate. But I'm unsure as to which one. I'm thinking tial 38mm or maybe 40mm? Idk and what spring combo should I do? Any help would be greatly appreciated thank you.
adam s
09-03-2011, 09:33 PM
Try here buddy:
http://zilvia.net/f/chat/297481-small-questions-thread-search-first-use-instead-making-new-threads-252.html

That question is not new, and should be searched before posting in the small questions thread, but it definitely doesn't deserve it's own thread.
fliprayzin240sx
09-03-2011, 10:23 PM
Well, what are you planning on getting for a manifold? Depending on the manifold will usually dictate the wastegate you'd run.

Personally, run the stock manifold. Just get it extrude honed, then have a machine shop drill and weld a v-band flange on it, then run a v-band 44mm tial MVS on it.
harrypotter
09-03-2011, 11:10 PM
There is also a huge thread dedicated to SR and 2871 users. I am posting from iPhone or I would include a link. I think that would be the beat place to look.
S14DB
09-03-2011, 11:22 PM
http://zilvia.net/f/tech-talk/124925-gt2871-users-sr-motor.html
anton1o
09-03-2011, 11:50 PM
In regards to spring choice ive always tried to keep the spring within a few PSI of the intended boost level, that way you get the closest boost curve and the external gate is actually doing its best job.

Some people have said a spring is good for double the amount so a 10PSI spring would be good for upto 20PSI but ive always prefered if its within 2PSI!
S14DB
09-03-2011, 11:55 PM
In regards to spring choice ive always tried to keep the spring within a few PSI of the intended boost level, that way you get the closest boost curve and the external gate is actually doing its best job.

Some people have said a spring is good for double the amount so a 10PSI spring would be good for upto 20PSI but ive always prefered if its within 2PSI!

I agree with this. A quality spring will always produce an idea boost curve. EBCs start getting harry the more you try to increase the boost over the spring pressure.