Im soon runnin a turbo on my stock ls internals.... now the question is.... if i was to run turbo... should i have 2.25 piping for the exhaust? or a 3? now i know you guys are prolly gonna say " GO SEARCH you noob" or sumtin, but i have, and couldnt find what i was looking for....(if you guys can find the thread, come slap me and link me the thread.... thanks...) anywayz for those who want to tell me here.... i would like to know what diameter should i have? 2.25? or 3? oh yeah im runnin 6 -7 psi for now.... daily driven.... thanks allot for those that helped me towards my turbo...

 

the biggest you can fit is the best choice

 

2.5" becomes a limitation around 300whp or so, and you will always spool faster with a 3". It's up to you. I had a 2.5, so I left it. It works, but If I had to do it again, 3" all the way.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Johnyquest &raquo;</TD></TR><TR><TD CLASS="quote">2.5" becomes a limitation around 300whp or so, and you will always spool faster with a 3". It's up to you. I had a 2.5, so I left it. It works, but If I had to do it again, 3" all the way.</TD></TR></TABLE>
um no, larger piping will cause you to have less resistance and less exhaust pressure for build up so you will spool slower. bad part about 2.5" is that once you pass a certain flow rate you start to lose power. 3" is a good for mid to higher boost but for low boost and a faster spooling turbo stick with 2.5"

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked B16 &raquo;</TD></TR><TR><TD CLASS="quote">
um no, larger piping will cause you to have less resistance and less exhaust pressure for build up so you will spool slower. bad part about 2.5" is that once you pass a certain flow rate you start to lose power. 3" is a good for mid to higher boost but for low boost and a faster spooling turbo stick with 2.5"</TD></TR></TABLE>

how does that work??? If you have more back pressure then why would the turbo spin faster, seems a bit backwards to me. And besides, doesn't a majority of the spooling characteristics come from the design of the manifold. With less backpressure the exhaust can allow the manifold to do what is was designed to do. Maybe i am wrong on this so correct me somone if i am wrong.