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Converters or Not?

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  • #16

    Re: Converters or Not?

    So if I add cats to the camaro so there is something to abuse then the EFI might work better?

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    • #17

      Re: Converters or Not?

      So if I add cats to the camaro so there is something to abuse then the EFI might work better?
      suffer the abuse of tuning....
      Doing it all wrong since 1966

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      • #18

        Re: Converters or Not?


        Cats need to be as close to the motor as possible, thus usually they're in the pipes coming down from the motor (which they are on my '40). Mufflers get every bit as hot as cats because the restriction builds heat... but the most important anti-fire device is the person who doesn't park in tall grass.... just sayin'

        I'm using these https://www.amazon.com/MagnaFlow-539...79411550&psc=1

        they've survived a lot of abuse - which is important when you're tuning EFI

        with that said, if you got the cats with the motor, use those - only 2 of them but you can mix and match, if you use the first position ones, you get manifold adapters as well and a leak-proof seal at the exhaust.....
        This is exactly what I was looking for. Thanks. I have shorty headers (ground clearance & truck manifolds don't fit) and have long since sent the donors cats down the road. I'll likely pick up a pair of these and mount them as close as possible to the header collector.

        Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
        74 Nova Project
        66 Mustang GT Project

        92 Camaro RS Convertible Project
        79 Chevy Truck Project

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        • #19

          Re: Converters or Not?

          These are what I added. Stainless 3.0L from Jegs. 2.5" in and 2.5" out.

          Click image for larger version  Name:	iwI1nO7.jpg Views:	0 Size:	286.6 KB ID:	1259066
          Last edited by STINEY; December 30th, 2019, 01:13 PM.
          Of all the paths you take in life - make sure a few of them are dirt.

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          • #20

            Re: Converters or Not?

            These are what I added. Stainless 3.0L from Jegs. 2.5" in and 2.5" out.

            Click image for larger version Name:	iwI1nO7.jpg Views:	0 Size:	286.6 KB ID:	1259066
            Do you have the part number for that? Thanks.
            Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
            74 Nova Project
            66 Mustang GT Project

            92 Camaro RS Convertible Project
            79 Chevy Truck Project

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            • #21

              Re: Converters or Not?

              Yep. https://www.jegs.com/i/Dynomax/289/15038/10002/-1

              The stainless Jegs brand clamps seem pretty good too. Have not fired engine with them on, but otherwise they pass muster.

              https://www.jegs.com/i/JEGS/555/30732/10002/-1

              74NovaMan likes this.
              Of all the paths you take in life - make sure a few of them are dirt.

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              • #22

                Re: Converters or Not?

                DynoMax is Walker which is an OEM supplier. Those ought to be excellent. They appear to be HC/CO cats loaded with (most likely) platinum (that's the wash cost on the substrate which is what makes them active). My guess is that they don't have a NoX brick in there but no one could accuse you of not trying. They probably won't do much until the engine warms but that doesn't take too long - don't be surprised if you get a little exhaust smell until they light off.

                EDIT: I reread the description it says its a 3-way so it should be active for NoX as well. Probably a bit of palladium or rhodium in there, too. But probably not too much as it says it's not CA legal but CA is a PITA on what they allow.

                Dan
                Last edited by DanStokes; December 31st, 2019, 02:48 PM.
                STINEY likes this.

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                • #23

                  Re: Converters or Not?

                  Guys - these are internal combustion engines - WHY would you want to get rid of their pheromones?
                  Deaf Bob and silver_bullet like this.

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                  • #24

                    Re: Converters or Not?


                    This is exactly what I was looking for. Thanks. I have shorty headers (ground clearance & truck manifolds don't fit) and have long since sent the donors cats down the road. I'll likely pick up a pair of these and mount them as close as possible to the header collector.
                    Will want to get your O2 sensors in and have someone do a PO420 Code delete it is for the after cat sensors which do not affect the tuning, but are a nuisance on the service engine soon indicator light...
                    Patrick & Tammy
                    - Long Haulin' 2008, 2009, 2010, 2011, 2012, 2014...Addicting isn't it...??

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                    • #25

                      Re: Converters or Not?


                      Will want to get your O2 sensors in and have someone do a PO420 Code delete it is for the after cat sensors which do not affect the tuning, but are a nuisance on the service engine soon indicator light...
                      HP Tuners, you just turn them off.
                      silver_bullet likes this.
                      Doing it all wrong since 1966

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                      • #26

                        Re: Converters or Not?

                        These are what I added. Stainless 3.0L from Jegs. 2.5" in and 2.5" out.

                        Click image for larger version Name:	iwI1nO7.jpg Views:	0 Size:	286.6 KB ID:	1259066
                        Cool, now add some heat reflecting material to the floor and under the seat, or better yet, build some sheet of aluminum over it to allow some air space between the floor.

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                        • #27

                          Re: Converters or Not?

                          Thanks for all the great feedback and part numbers. I'm currently looking into tuner options as I'll need to delete all sorts of stuff for my application (2003 motor into a 79 pickup).
                          Chris - HRPT Long Haul 03, 04, 05, 13, 14, 15,16 & 18
                          74 Nova Project
                          66 Mustang GT Project

                          92 Camaro RS Convertible Project
                          79 Chevy Truck Project

                          Comment

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