JamesRB25280zx Posted April 28, 2017 Share Posted April 28, 2017 I'm running an rb25.need to make a pipe for the hot side. Is 3" overkill for my engine? With the L28 I used 2 1/4 on the hot side and 3" on the cold. Thanks Quote Link to comment Share on other sites More sharing options...
baggedgoods Posted April 28, 2017 Share Posted April 28, 2017 Depending on your power goals. I've got a 3.0 with a 2.5" down pipe. I believe 2.5" exhaust is rated for 500-600 bhp. I personally believe that using 3" wouldn't hurt anything. A lot of people think the exhaust back pressure would be too low and yada yada. Back pressure is bad for any vehicle. Im pretty sure back pressure has something to do with having a catalytic converter(which I'm sure you dont.) Just make sure you're getting adequate air and you'll be fine. Here's a link about back pressure http://www.dsmtuners.com/threads/exhaust-the-straight-scoop-on-backpressure.168578/ Quote Link to comment Share on other sites More sharing options...
JamesRB25280zx Posted April 28, 2017 Author Share Posted April 28, 2017 Thanks. No cat, 3"exhaust, stock turbo at 11psi. Will get bigger turbo later. Greddy style intake and q45 tb. Quote Link to comment Share on other sites More sharing options...
jessejames Posted April 29, 2017 Share Posted April 29, 2017 James, Are you asking about exhaust piping or intercooler piping? For intercooler piping, shorter and smaller will be more responsive to a point, alot of it will depend on the turbo size. For exhaust I would go 3". For intercooler piping I would say go 2.5". Quote Link to comment Share on other sites More sharing options...
baggedgoods Posted April 30, 2017 Share Posted April 30, 2017 I was actually wondering that myself, but the hotside of a turbo goes to the exhaust, so I'm assuming that he meant exhaust. Might have made things a bit simpler had he said exhaust and not hotside of turbo. Also, James is right about running 2.5" intercooler piping. A lot better volume for the amount of psi you plan on running. Quote Link to comment Share on other sites More sharing options...
JamesRB25280zx Posted May 2, 2017 Author Share Posted May 2, 2017 Thanks. I was meaning the intercooler pipe from turbo to intercooler. Currently I have a 3" pipe from intercooler to tb. I need to get one made for the other side and was wondering what size would be more beneficial. Quote Link to comment Share on other sites More sharing options...
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