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  • omg pipes, pipes, pipes, im so confussed...

    after all the talk i guess flomasters the best but the system they make for 3.8s is 2.5, most of u guys have custom 2.75 or even 3in. Isn't there a reason they only make 2.5in for our cars? We need a certain amount of backpressure. What size catback will give me the most hp gain? And if 3" is the case, will the 3"american thunder for the v8 fit my 3.8??
    **P.S. the only performance mods on my car right now is the slp cold air scoop, and whisper lid and all i wanna do is make my car faster, if that helps)

    [ April 09, 2003: Message edited by: SlimJim1284 ]</p>

  • #2
    Anybody?????

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    • #3
      My friend and I have the same car...just his is 98 and mine is 99...mods are the same where he has 2.5 and I have 2.75" and I can beat him rather easily.

      Also I have track proven that enlarging the catback yielded 0.1sec quicker ET and a 1.5MPH increase

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      • #4
        bigger is better IMO... i'd go 3".
        Sounds better and i honestly believe you will get better performance overall. Some will say you lose some low end torque. My experience.... maybe a little, but it is made up for and then some in the upper rpm range. [img]graemlins/thumbsup.gif[/img]

        -Justin
        2001 Camaro Z28 (A4) Sunset Orange Metallic w/ T-tops, Monsoon Stereo, factory GFX, BMR STB from the v6, 18K miles<br /><a href=\"http://www.cardomain.com/id/jhkcam22\" target=\"_blank\">2001 Camaro Z28</a><br /><br />Dads car: 2002 35th aniv. Bright red Z28, fully loaded<br /><br />R.I.P.<br />1995 3.4L Camaro (A4) Bright Red<br /><a href=\"http://www.cardomain.com/id/jhkcam\" target=\"_blank\">1995 3.4 Camaro</a>

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        • #5
          hmmmm... i see ur point where can I get a 2.75 catback?

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          • #6
            refer to this about hp gains and this for the theory of 3'' vs. 2.5''

            Many V6 drivers upgrade to 2.5" systems all the way through - this will provide a solid power gain and a mean sound. Many more go with the 3" all the way, and there is a common myth that you lose torque with this one. NOT TRUE! The reason a lot of people with 3" exhaust think that they have lost torque is because the engine is more efficient--it is producing the power more smoothly, resulting in less of a noticeable kick when they stomp on the gas. The power is still there, even if it feels like it is not. Little things like this prove the point that the only way to accurately determine the gains from a modification are strict before and after dyno tests. The feel of your engine can be deceiving.

            [ April 10, 2003: Message edited by: naptown ]</p>

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            • #7
              3" is overdoing it unless you're either running nitrous, supercharger, or turbo.

              Think about it...LS1 is 5.7L and most of their common catbacks are 3". I dont' see too many of them straying to a larger exhaust to get free-er flowing exhaust. We're running a much smaller motor with only 3.8L of displacement. But hey look buddy, do what you want, it's your car. I'm telling you tho that you DO NOT need 3" piping.

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              • #8
                how do you go about getting a 2.75 inch if the american thunder is 2.5. PLease list prices, I want the same mods.
                \'96 M5 Camaro White<br />Flowmaster Full Catback<br />SLP CAI<br />180* Thermo<br /><br />Stereo: H/U - Clarion DXZ725 <br />Alipne Type-R 6.5 Components (front), <br />Alpine Alpine SPS-1629S 6.5 <br />2 10\" JL 10w0<br /><br />\"One Love\" -Bob Marley

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                • #9
                  <blockquote>quote:</font><hr>Originally posted by 99Camaro99:
                  3" is overdoing it unless you're either running nitrous, supercharger, or turbo.

                  Think about it...LS1 is 5.7L and most of their common catbacks are 3". I dont' see too many of them straying to a larger exhaust to get free-er flowing exhaust. We're running a much smaller motor with only 3.8L of displacement. But hey look buddy, do what you want, it's your car. I'm telling you tho that you DO NOT need 3" piping.
                  <hr></blockquote>

                  3" is not overdoing it. i have a 3" catback. i made 170 hp / 207 tq with my "overdone" system and i only have a 3.4, not a 3.8.

                  also -- to prove that the theory of "engines need backpressure" is complete [img]graemlins/bs.gif[/img] - my car made 203 tq @ 4051 rpm with the cutout closed (air going thru the bend to the muffler and out the bends to the exhaust tips and out = restriction.)

                  and made 207 tq @ 3529 rpm with the cutout open (open exhaust system, no restriction whatsoever (i dont even have a cat))

                  so if engines need backpressure to make torque down low...then why did mine make torque lower with the exhaust system with 0 backpressure? (i have headers too)

                  if you dont believe me you can look here, i ocr'd the results and made a webpage:
                  http://camaro.adwire.com/dyno4.html
                  and the dynograph to go with it:
                  http://camaro.adwire.com/dyno1.2.jpg

                  theres proof that an open exhaust does better than one that creates backpressure. ;)

                  -R

                  hybrid - \'\'hI-br&d - The offspring of a cross between species.
                  Co-Founder West Coast F-Bodies
                  West Coast F-Bodies Car Club - WCFB Message Board

                  Comment


                  • #10
                    <blockquote>quote:</font><hr>Originally posted by Russell:

                    Above

                    <hr></blockquote>

                    [img]graemlins/thumbsup.gif[/img]
                    2001 Camaro Z28 (A4) Sunset Orange Metallic w/ T-tops, Monsoon Stereo, factory GFX, BMR STB from the v6, 18K miles<br /><a href=\"http://www.cardomain.com/id/jhkcam22\" target=\"_blank\">2001 Camaro Z28</a><br /><br />Dads car: 2002 35th aniv. Bright red Z28, fully loaded<br /><br />R.I.P.<br />1995 3.4L Camaro (A4) Bright Red<br /><a href=\"http://www.cardomain.com/id/jhkcam\" target=\"_blank\">1995 3.4 Camaro</a>

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                    • #11
                      <blockquote>quote:</font><hr>Originally posted by SlimJim1284:
                      hmmmm... i see ur point where can I get a 2.75 catback?<hr></blockquote>
                      That's just basically a bigger I pipe that's off a V8 fbody. Their stock pipes are 2.75".
                      <b>99 Camaro Z28 A4</b><br />R.I.P. 00 Firebird 3.8<br />14.89 @ 90, 2.03 60\'

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                      • #12
                        &lt;-- 3"
                        -Chad<br /><a href=\"http://members.cardomain.com/chiknz\" target=\"_blank\">2001 3.8L A4 Camaro</a>

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                        • #13
                          Here is some advice from some "experts"
                          http://www.dynomax.com/techsupport.stm
                          Dr Todd

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                          • #14
                            that chart on that site assumes that you will never get more than 250 hp out of a 3.4L engine. (note that the highest HP number is 250) any higher than that and it moves to the next size group up.

                            and if 3" and no backpressure is bad for our cars, then why did i gain more hp and drop rpm when i removed the cutout, as opposed to leaving it on and having the air bend through the muffler?

                            i know these "experts" seem to have all the answers. id like to have a few of them explain my car's hp / tq.

                            thank you, thats all i have to say on the matter.

                            -R

                            hybrid - \'\'hI-br&d - The offspring of a cross between species.
                            Co-Founder West Coast F-Bodies
                            West Coast F-Bodies Car Club - WCFB Message Board

                            Comment


                            • #15
                              <blockquote>quote:</font><hr> also -- to prove that the theory of "engines need backpressure" is complete - my car made 203 tq @ 4051 rpm with the cutout closed (air going thru the bend to the muffler and out the bends to the exhaust tips and out = restriction.) <hr></blockquote>
                              you can go too big! engines do have to have some backpressure, if you dont believe me, go ahead and put u a 3.5" I pipe, u'll slow down...also just because ur peak dyno number is higher doesnt mean you will run faster,to a point,w/a smaller exhaust the motor will accelerate faster in the lower RPM's making it run better times, it may not dyno as high of peak HP but it will be faster because the average HP is higher...
                              <b>Black</b> 1998 Pontiac <i>Firebird</i> A-4 swap<br />271.4rwhp/259.4rwtq NA<br />13.30@102.44 <br /><a href=\"http://www.freewebs.com/wickedsix98\" target=\"_blank\">www.freewebs.com/wickedsix98</a>

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