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Front DE- Precat Problems Perhaps ???

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  • Front DE- Precat Problems Perhaps ???

    Just fitted this pipe this pm. Observatons so far :

    Feels not as responsive as before ??? WHY

    First time ever under pressure felt that it went into limp mode ???

    More exhaust noise, expected a bit i guess

    More clicking noise from rear silencer on deaccleration ???

    Anyone else noticed these points ???

    I might just put the precat back on. Before it was responsive as hell with the sports button on. I wonder if the ECU realises there is less back pressure and cuts back etc.

    All in all at this stage not really happy at all

    Any advice would be appreciated !!!

    :? :? :?

  • #2
    Cant really help you as mine is sitting waiting to be fitted but what exhaust are you running? Precat and cat back or pre cat and standard cat back system?

    Comment


    • #3
      Standard exhaust except for the precat removal pipe fitted today.

      The next stage would be the remap, the type of stage 1.5 map etc.

      Just do not know if the probs will sort out etc.
      I will of course have to give it a bit of time, although a limp mode i have never had before tonight directly after fitting the pipe.

      Hope it will all sort out, maybe the ECU needs to come to terms with it fitted. I really hope that is the case etc.

      :? :? :?

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      • #4
        Is the Lamba (oxygen sensor) connected ?

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        • #5
          I did connect it back up correctly. I checked this twice.

          There is no eng management light on either which i assume would be if such a sensor was disconneected.


          :? :? :?

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          • #6
            Just a couple of questions.

            I assume you didn't touch the main cat lambda. If you did , is there a chance you got them back to front, without sounding insulting.

            Did the lambda get any dirt inside whilst out and all the wires are OK

            No leaks ? as this will cause mis reading between the 2 lambda.

            Best idea may be to call the supplier to discuss.

            As the precat gone some of the clicking as you put it is unspent fuel in the system being more noticeable.

            Comment


            • #7
              Originally posted by Sparky
              Just a couple of questions.

              I assume you didn't touch the main cat lambda. If you did , is there a chance you got them back to front, without sounding insulting.

              Did the lambda get any dirt inside whilst out and all the wires are OK

              No leaks ? as this will cause mis reading between the 2 lambda.

              Best idea may be to call the supplier to discuss.

              As the precat gone some of the clicking as you put it is unspent fuel in the system being more noticeable.

              Yes all of the above seemed ok. It was done very carefully, only the one front lambda was removed and definately not contaminated. If there was a problem there would it not show on the ECU light ??? or not.


              I will give the car a run this am to see if any difference. Does the ECU need to adjust for this fitment in any way?. I assume there must be something as all the extra pressure is going to the furthest sensor {catback}, but what about the fornt sensor? will there be less of a reading there as the gases are now passing it at a higher rate {not hanging around before the precat etc ???

              :? :? :?

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              • #8
                should have been fine.

                turbos dont have a lot of back pressure as they run on a positive charge.

                Was the ignition turned on with the sensor disconected as this will cause limp home mode.

                Try disconecting the battery for about 5-10 mins then put it back on this should clear the fault code if there is on, not all faults put a light on the dash.

                Comment


                • #9
                  Give it good go this morning and feels about the same to be honest.
                  It also now pops when accelerating hard at gear change {Is this normal ???}

                  I somehow feel now that if i whack the car heavily it feels as if the boost then needs to recover a bit before allowing full boost again.

                  I wonder if the extra flow through actually affects the rear lambda temp/ flow / mix etc & then causes problems for continuously heavy boost driving. Maybe causing the ECU then to hold back until temp is more normal ???

                  Hmmmmm i just do not know at this stage if all is ok !!!

                  :? :? :?

                  Comment


                  • #10
                    ref the poping that is normal.

                    as for the other stuff nor to sure.

                    ecu should read that boost is now quicker to pressure and compensate.

                    You might also be expecting tooo much.

                    Mine has the full miltek and is not that much quicker over the std one but i do notice a bit more in the mid range.

                    If your still not sure get it on a set of rollers like Courtenays and have it power run this should sholve any worries you have.

                    Comment


                    • #11
                      Originally posted by alex_c
                      ref the poping that is normal.

                      as for the other stuff nor to sure.

                      ecu should read that boost is now quicker to pressure and compensate.

                      You might also be expecting tooo much.

                      Mine has the full miltek and is not that much quicker over the std one but i do notice a bit more in the mid range.

                      If your still not sure get it on a set of rollers like Courtenays and have it power run this should sholve any worries you have.

                      The car feels not as responsive though, i was not expecting vast power gains to be honest but this feels lumpier and not as smooth, slower even.

                      The trouble i have is no dyno runs before or after fitment and a specialist like Courtney or TMS are a long way away. I do however want a stage 1 remap but do i ditch this pipe and go back to the precat. The car felt awesome like that !!!

                      This is really frustraing has no one that upgraded just this front pipe noticed this change of response and smoothness ???

                      I just do not know !!!

                      :? :? :?

                      Comment


                      • #12
                        keep the front pipe.

                        Get the full exhaust then go for the map.

                        Comment


                        • #13
                          Loads more testing today & ???

                          Still not convinced at all.

                          Maybe i have got it wrong and the front pipe only comes into its own
                          with a remap. Hmmmm guess that is a possibility. Although i have not seen anyone say on the forums about such a problem.

                          Just maybe they have had a remap straight away & not noticed these little things.

                          Need a remap soon i guess or take the Bl**dy front pipe off.

                          Another thing my MPG has gone down by 2 mpg ??? Why ???


                          :? :? :?

                          Comment


                          • #14
                            It doesn't sound like its a lambda issue as you'd get fault codes and an EML light come on. Its possible the actuator is having a few issues with the extra flow but it shouldn't be as bad as that. Pop to local dealer and ask them for a quick Tech 2 analysis, they shouldn't charge (we don't) and will only take a few minutes so that will at least confirm what it isn't. The popping and banging is normal with a full system but a little surprising with just a precat removed tbh but I don't think its a problem.

                            Comment


                            • #15
                              Originally posted by Turbowayne
                              Loads more testing today & ???

                              Still not convinced at all.

                              Maybe i have got it wrong and the front pipe only comes into its own
                              with a remap. Hmmmm guess that is a possibility. Although i have not seen anyone say on the forums about such a problem.

                              Just maybe they have had a remap straight away & not noticed these little things.

                              Need a remap soon i guess or take the Bl**dy front pipe off.

                              Another thing my MPG has gone down by 2 mpg ??? Why ???


                              :? :? :?

                              my old Z20LET gained 19 bhp over std with the front pipe and the air box mods and with iridium pluge.

                              Z20LEH's have iridium plugs and mod'd air box's.

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