Full 3" turbo exhaust?
Full 3" turbo exhaust? I'm going back and forth on my exhaust plan and I'm running out of time.
Ls1 with ls6 cam, Turbonetics tc78 in a BMW 528i. I don't plan on running a cut out or a dump at any time. I want a full exhaust, all the way to the back bumper. It won't have a catalytic converter. The down pipe is 3". A single 3" all the way back would be ideal due to a lack of space to run the tail pipe. I also have been considering running 3" past the transmission, then splitting into twin 2.5" pipes. May be possible to go from 3" to 3.5" behind the transmission. I could run an open wastegate to help offset the smaller 3" exhaust if I went that route. Planning to run 8-10 psi at this point and hoping for low 500's at the tire. Down the road I may go for 600, I would love some insite from guys who have done some testing this!
Ls1 with ls6 cam, Turbonetics tc78 in a BMW 528i. I don't plan on running a cut out or a dump at any time. I want a full exhaust, all the way to the back bumper. It won't have a catalytic converter. The down pipe is 3". A single 3" all the way back would be ideal due to a lack of space to run the tail pipe. I also have been considering running 3" past the transmission, then splitting into twin 2.5" pipes. May be possible to go from 3" to 3.5" behind the transmission. I could run an open wastegate to help offset the smaller 3" exhaust if I went that route. Planning to run 8-10 psi at this point and hoping for low 500's at the tire. Down the road I may go for 600, I would love some insite from guys who have done some testing this!
I plan to dump my wastegate into open air, run 4" dp from the turbo down to 3" through the k member all yhe way back through a magnaflow catback w a cut out just past the trans where it meeta the catback.
Open gate. The car is a fox body. I have about 3' of 3.5" pipe then the rest is all 3". I have a cut out just before the muffler. In my situation I think that my turbine is more of a restriction than the exhaust. I'm running a little mpt70 with a .96ar. I will have some more comparisons with my s475.
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TECH Enthusiast
Joined: Oct 2012
Posts: 581
Likes: 0
From: Arkansas
I run 3 inch exhaust with a one chamber flowmaster on a LT1 a long time ago. It did fine . I wouldn't run a flowmaster on a turbo setup anymore but it will work with full exhaust. My corvette has full exhaust it made 670 to the wheels on a stock ls6 on 14 psi.
