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M20 Header Options in 2019

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    #16
    AAF headers?

    I was up above it, Now I'm down in it ~ Entropy - A Build thread.
    @Zakspeed_US

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      #17
      I've never seen AAF headers before now. Are there any tests out there other than their own claims? I'm willing to buy that their 6-3-1 configuration might make more power than traditional 6-2 BMW headers, but I don't about 1 3/4" primaries, and I especially don't know about their dramatically unequal primary lengths.
      Last edited by vehicular; 05-22-2019, 05:28 AM.

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        #18
        Whats your HP goal?

        I was up above it, Now I'm down in it ~ Entropy - A Build thread.
        @Zakspeed_US

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          #19
          Who is AAF ?
          89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

          new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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            #20
            Advanced Auto Fabrication, out of Spokane, Washington, USA. Popular amongst the PRO-3 crowd.
            '72 2002 pickup | '88 M5 | '89 330is | '89 M3 | '01 Z3M | '11 328xi-t

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              #21
              Originally posted by moatilliatta View Post
              Whats your HP goal?
              Bout tree fiddy.

              I had about a novel typed up to explain that I'm not really the scrub that this thread probably makes me sounds like, but... I guess I just want whatever I can get out of a reasonable street motor? I'm not trying to do an F1 engine dev program, just build a warmed up street car with good manners, AC, low enough compression that I can run 89 without pinging it to death, etc.

              I'd be happy with 200-225whp, it sounding cool, and the motor looking like it belongs in the engine bay.

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                #22
                Originally posted by digger View Post
                Who is AAF ?
                This:

                AAF Racing is your number one racecar parts supplier and service. Get to the front!

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                  #23
                  Quality looks good construction wise and they don't have shitty bends right at the flange like some.

                  I dont get why make bold claims quoting exact numbers and not back them up with proper evidence about exactly what was compared (exhaust setup and engine specs) and the outcome in terms of dyno sheet overlays ? It would be much more credible. It always pays to remember the exhaust is a system and what happens after the primary is probably as important as the primary itself which comes back to what the comparison was and why any changes occurred.

                  Some casual observations are the pipe sizes are way larger than what is recommended by some of the best professional exhaust guys out there have found works best. Those sizes are capable of probably 500bhp atleast so how effective can they really be on a 250hp engine where the port is lucky to be 1-1/4"?

                  There are people that push 6-3, 6-2 or 6-1 but the differences are going to better in some areas and worse in others. There is no magic solution that bests all that's just how wave tuning works you get positive and negative waves.

                  6-2 is usually chosen because of easier packaiging plus with 240* separation of pulses there isn't much need for 360* separation that the 6-3 produces. 6-1 might be able to make more peak within a narrow rpm band as the strength of scavenging should be a bit higher but you lose out elsewhere.

                  I haven't tested all the different configurations but 1D simulations predict it's not worth deviating from a tried and true 6-2 when I do my custom set soon.
                  Last edited by digger; 05-21-2019, 08:48 PM.
                  89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                  new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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                    #24
                    Originally posted by digger View Post
                    when I do my custom set soon.

                    I just caught this. Any interest in selling those BTBs ;D

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                      #25
                      I just called IE, and the sales(?) girl said that they would have headers "within a month" for whatever that's worth.

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                        #26
                        Originally posted by vehicular View Post
                        I just caught this. Any interest in selling those BTBs ;D
                        At some point I'll unload one of the sets lol but not any time soon
                        Last edited by digger; 05-23-2019, 02:48 PM.
                        89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                        new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                        Comment


                          #27
                          Originally posted by vehicular View Post
                          I just called IE, and the sales(?) girl said that they would have headers "within a month" for whatever that's worth.
                          Contact Rama from RHD. At one point he was going make a batch. He made a prototype that looked better than anything currently on the market (pics/were are on his Facebook from a couple years back). I don't know if it's still planning to go ahead or whether it fell to the wayside
                          89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                          new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                          Comment


                            #28
                            Originally posted by digger View Post
                            At some point I'll unload one of the sets lol but not any time soon
                            ONE of the sets... guy...

                            Originally posted by digger View Post
                            Contact Rama from RHD. At one point he was going make a batch. He made a prototype that looked better than anything currently on the market (pics/were are on his Facebook from a couple years back). I don't know if it's still planning to go ahead or whether it fell to the wayside
                            I sent him a message on Facespace. He last posted pics of them in 2016. My hopes are not high.

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                              #29
                              Originally posted by vehicular View Post
                              ONE of the sets... guy...



                              I sent him a message on Facespace. He last posted pics of them in 2016. My hopes are not high.
                              Every time you get rid of something you realise that you wanted to keep it.
                              89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                              new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                              Comment


                                #30
                                Originally posted by digger View Post
                                Quality looks good construction wise and they don't have shitty bends right at the flange like some.
                                do you mean RD headers?

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