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  4. Turbo car. Cat or no cat.

Turbo car. Cat or no cat.

Scheduled Pinned Locked Moved Car Tech
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  • 24valvenotak2 Offline
    24valvenotak2 Offline
    24valvenotak
    wrote on last edited by
    #4

    gotcha

    just take it out and leave the muffler hanging there :icon_thumleft:

    Getcher green hat, we are goin fishin.

    > 63vette;288530 wrote:
    > I dont know shit about building cars.

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    • 94NDTA9 Offline
      94NDTA9 Offline
      94NDTA
      wrote on last edited by
      #5

      92BlackTT wrote:
      gotcha

      just take it out and leave the muffler hanging there :icon_thumleft:
      Thats what I am trying to get him to do. I told him he should just ditch the cat, but I don't think he will.

      legacy image

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      • ticklemedalyT Offline
        ticklemedalyT Offline
        ticklemedaly
        wrote on last edited by
        #6

        if he's from around here, he shouldn't have too many problems legal wise as long as it is quite enough. As for the Hp difference, yes there will be a difference, but his main goal should be fuel management. If he doesn't have a decent way of managing the proper air/fuel going into the engine, he wont see the maximum power potentials. What year Dat is it? OBD2 is the question I have about it....dont remember if they made it that far to have OBD2 or not, but i'm pretty sure it doesn't.

        XBL G-tag: TickleMeDaly83

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        • 94NDTA9 Offline
          94NDTA9 Offline
          94NDTA
          wrote on last edited by
          #7

          it's 89 tII daytona.

          legacy image

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          • JoelJ Offline
            JoelJ Offline
            Joel
            wrote on last edited by
            #8

            nope, i think daytonas stopped being made in 92 or 93

            no race car? becuz homeowner...

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            • K Offline
              K Offline
              KA-T_240
              wrote on last edited by
              #9

              no matter what its still illegal to not have a cat on a street vehicle in the us unless it like pre 71 or something like that. but you probably wont have a problem if you dont as long as you dont go on the internet and go hey guys i took my cat off today YAY

              PM me for:
              Sandblasting(I use glass beads)
              Diesel repairs or performance products.

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              • ? This user is from outside of this forum
                ? This user is from outside of this forum
                Guest
                wrote on last edited by
                #10

                97jeep wrote:
                no matter what its still illegal to not have a cat on a street vehicle in the us unless it like pre 71 or something like that. but you probably wont have a problem if you dont as long as you dont go on the internet and go hey guys i took my cat off today YAY

                So I shouldn't say "Hey guys, I took all 3 cats off 4 years ago" then either I suppose?

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                • Turbo5OhT Offline
                  Turbo5OhT Offline
                  Turbo5Oh
                  wrote on last edited by
                  #11

                  tell him to gut the cat and put a 3inch o.d. pipe (or what ever size i.d. is on the exhuast) inside of it so it doesnt resonate it will look legal and not restrict flow and the cop will have no way to prove it not legal

                  LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING ' HOLY SHIT.....WHAT A RIDE'

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                  • mx6phanM Offline
                    mx6phanM Offline
                    mx6phan
                    wrote on last edited by
                    #12

                    I just took mine off before I pulled in. They owner said the law states that they only have to put one on if it came in with one.

                    Earl Stanley MSN- [email protected]
                    93 Mazda MX-6 2.0 13.6@104mph (9psi) Daily Driver
                    94 Ford Probe GT (new project)

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                    • ? This user is from outside of this forum
                      ? This user is from outside of this forum
                      Guest
                      wrote on last edited by
                      #13

                      94NDTA wrote:
                      What is the difference (HP wise) between a turbo car with a high flow cat or no cat at all. The reason I ask is my buddy got a new 3 inch exhaust for his turbo daytona, but had the put on a high flow cat. Is there a big difference in hp?

                      I think he should stick with the cats. I think its going tobe kinda loud. To the point where he's going to wish he left the cats on.

                      Take the cats off and see how he likes it?

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                      • K Offline
                        K Offline
                        KA-T_240
                        wrote on last edited by
                        #14

                        gunmaster wrote:
                        I think he should stick with the cats. I think its going tobe kinda loud. To the point where he's going to wish he left the cats on.

                        Take the cats off and see how he likes it?

                        but if you do this youll need a test tipe or something there a HUGE differance in running open DP or no cat.

                        PM me for:
                        Sandblasting(I use glass beads)
                        Diesel repairs or performance products.

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                        • JohnWJ Offline
                          JohnWJ Offline
                          JohnW
                          wrote on last edited by
                          #15

                          In my personal experience, I like my car alot better with a cat on. I had a small round magnaflow high flow cat put on, and it made my car quite a bit quieter, especially at idle. Also it stinks alot less at stoplights, and I think I got a little low end back (lost some top end, but I don't really use the top end that much)
                          A cat may affect horsepower a bit, but not much, and unless you are squeezing every last bit out of the car already, you could get that back somewhere else. I think for me, the cat was a great decision and i'm very happy with it. YMMV

                          90 Civic DX hatch
                          D16a6/y8 mini me

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                          • D Offline
                            D Offline
                            dynotune
                            wrote on last edited by
                            #16

                            depending on application you WILL NOT lose much power at all if you have a GOOD converter. I have made 600 plus to the wheels w/ them and alot of cars sound better with them in place. People that pick up horsepower w/ no converter is generally due to the cats being plugged. Good converters on a supercharged car will INCREASE the HP. I would advise him to leave the converter alone.

                            DynoTune Speed & Performance
                            Custom EFI Programming for Ford, GM, and all others
                            Mobile chassis dyno service
                            www.dynotuneusa.com
                            (605) 753-1101

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                            • SmitEvoS Offline
                              SmitEvoS Offline
                              SmitEvo
                              wrote on last edited by
                              #17

                              I love my car with no cat and it isnt even that loud.....:p I am guessing once I put on the 3inch turbo back I gained 20-30 hp.

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                              • Sweet-WRX-LovinS Offline
                                Sweet-WRX-LovinS Offline
                                Sweet-WRX-Lovin
                                wrote on last edited by
                                #18

                                dynotune wrote:
                                depending on application you WILL NOT lose much power at all if you have a GOOD converter. I have made 600 plus to the wheels w/ them and alot of cars sound better with them in place. People that pick up horsepower w/ no converter is generally due to the cats being plugged. Good converters on a supercharged car will INCREASE the HP. I would advise him to leave the converter alone.

                                There's the answer you were looking for. A really good high flow cat only becomes a significant restriction at ridiculous amounts of power and up. I grew up around the smell of unburnt gas so it's no cats for me. I love it. I said I love it.

                                One time...

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                                • ? This user is from outside of this forum
                                  ? This user is from outside of this forum
                                  Guest
                                  wrote on last edited by
                                  #19

                                  Sweet-WRX-Lovin wrote:
                                  I love it. I said I love it.

                                  This moment brought to you by Mr. Bartz (only Harvey people will have any idea what I'm talking about):icon_rr:

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                                  • ZeroZ Offline
                                    ZeroZ Offline
                                    Zero
                                    wrote on last edited by
                                    #20

                                    BAH! you might notice a slight difference without a cat. There aren't any tests, so you don;t have to worry about emissions. while you're at it, put a spark plug in the tail pipe.

                                    600 whp on a dynojet doesn't get my pants tight. 😉

                                    Chocolate Rain ;)

                                    MPI conquest

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                                    • ? This user is from outside of this forum
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                                      Guest
                                      wrote on last edited by
                                      #21

                                      Lose the cat., put in a test pipe. Chances are you'll melt the catalyst and end up with a plugged exhaust, if you're looking at a bigger turbo and most likely fueling adjustments.

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                                      • ErikE Offline
                                        ErikE Offline
                                        Erik
                                        wrote on last edited by
                                        #22

                                        Cats are for Californians.

                                        They call me, old man...

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                                        • 94NDTA9 Offline
                                          94NDTA9 Offline
                                          94NDTA
                                          wrote on last edited by
                                          #23

                                          He is shooting for the 425-450 whp mark. IT is allready really quiet for a 3 inch exhaust, I don't think it would be much louder without a cat.

                                          legacy image

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