TRUE DUALS WITH X PIPE?????????
Originally Posted by Cal
I did some calculations on the cross sectional area of different tubes, since flow is proportional to that. Flow is not proportional to diameter. Here's the results in order of flow potential:
Single 3.0" = 7.07 sq. inches
Single 3.5" = 9.62 sq. inches
dual 2.5" = 9.80 sq. inches
Single 4" = 12.56 sq. inches
dual 3.0" = 14.14 sq. inches
dual 3.5" = 19.24 sq. inches
I think a dual 3.0" is what I want!
Single 3.0" = 7.07 sq. inches
Single 3.5" = 9.62 sq. inches
dual 2.5" = 9.80 sq. inches
Single 4" = 12.56 sq. inches
dual 3.0" = 14.14 sq. inches
dual 3.5" = 19.24 sq. inches
I think a dual 3.0" is what I want!
Had a 2000SS that dynoed around 350HP/370TQ with pacesetter headers and a pacesetter y-pipe THEN an absolutely stock muffler and tailpipes (no cats). With JUST true duals, X-PIPE, Magnaflow mufflers (3" X with 2.5" out X), the car dynoed 370HP and 410TQ. Yeah it made a huge difference. This is with stock heads and a small cam (Speedtek S1)
Originally Posted by FAST LS1
For an NA car would you really need more than dual 2.5 exhaust? The throttle body is only a single 3in hole, so dual 2.5in pipe can still flow more than the intake can ever take in. I'm getting ready to do true duals and it seems that 2.5 should be more than enough even if I step up to heads and cam. They only reason to go to dual 3in exhaust would be for forced induction or nitrous.
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I think 2.5's are more than enough for a bolt on or cam only setup.
Once you cam, head, and go up in ci. you need the 3".
For those of us who are progressively modding the car with a certain end in sight (yeah right- hehe), 3" is a worthy investment.
Once you cam, head, and go up in ci. you need the 3".
For those of us who are progressively modding the car with a certain end in sight (yeah right- hehe), 3" is a worthy investment.
i really like the dual setups alot of guys are running right now
i just wanted something different so i did the setup i have. a single 3.5" flows as much as a dual 2.5" which is what i would have gone with anywyas
i just wanted something different so i did the setup i have. a single 3.5" flows as much as a dual 2.5" which is what i would have gone with anywyas
Originally Posted by Cal
Keep in mind, there is more going out the exhaust than what cam in the TB because you have all the gasses from the burned fuel. Also, the exhaust tract is much longer than the intake tract, so it is more important for it to be free flowing than the intake.
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I have the Speed Inc. custom 3" duals w/ bullets. It is hard to tell how much it helped, if any, because at the same time I also had a cage, xtreme tq arm and boxed subframes put on, which all added a lot of weight. Then again, I also had 4.10s installed too. The first time back to the drag strip I was running 4 tenths slower than my best but the weather was hot and humid. After installing the C1 cam, dropping another 130 lbs and smacking on a new set of slicks that were too tall, I finally improved 2 tenths and 3 mph over my previous set up. Overall, way too many changes to even guess how much it helped/hut. After reading this thread, I do feel a little more convinced that I purchased the right exhaust, though.
