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  • which chip

    hi all

    i have been reading up in the ecu tuning section, the various chips available for E30 M3.

    from what i have read majority all members from USA. with chips from the likes of Tuner/dinan/iigomotiv etc.

    is anybody from the UK used any chip that they can recommend? any remap companies from the UK? there is one i can think of but they are pricey, really pricey.

    I think my car has been chipped before, the chip has some numbers on it and non-cat written on it by hand? The s14 also is heavy on fuel and i think it runs rich as you can smell fumes. I was thinking along the lines that installing a of the shelf chip would hopefully solve this. The S14 currently idles at around 1000rpm, which in my opinion is to high. Can the idle be Adjusted? what can i check for?

    apologies for the long boring post. any help/information is muchos appreicted.

    thanks:battle:

  • #2
    Is this with the A/C on or off? The ECU will bump up the idle to 900-950 rpm with the AC on. Otherwise it should be close to 850 rpm.

    -Luis

    Comment


    • #3
      Originally posted by marques
      Is this with the A/C on or off? The ECU will bump up the idle to 900-950 rpm with the AC on. Otherwise it should be close to 850 rpm.

      -Luis
      hi luis,

      thanks for reply

      this is with A/C off. if i turn a/c the rev/engine sound decreases, by i would say 100rpm.

      i would like it close to 850, bet it would help the fuel consumption.

      last couple days i have connected the blue and black ecu connectors (before it was just blue using normal unleaded fuel) and been using super unleaded 98 and 99 ron tesco super. i felt noticiable difference with the 99ron on throttle response and middle range pull. but idle just over 1000rpm.

      i got a sneaky feeling its down to the chip,

      anybody from UK, can you lend me a 215bhp m3 chip? please

      Comment


      • #4
        Have you tried to reset the idle speed? It's controlled by the ECU, within limits. If you change anything that could affect idle speed (chip), you could be operating outside the limits of the ECU. If this is the case, you need to adjust how much air bypasses the ICV so that it's within range again. You may have to turn in the adjustment screw a couple of turns before the idle comes down and the ECU starts regulating it again.

        HTH,

        -Luis

        Comment


        • #5
          Originally posted by marques
          Have you tried to reset the idle speed? It's controlled by the ECU, within limits. If you change anything that could affect idle speed (chip), you could be operating outside the limits of the ECU. If this is the case, you need to adjust how much air bypasses the ICV so that it's within range again. You may have to turn in the adjustment screw a couple of turns before the idle comes down and the ECU starts regulating it again.

          HTH,

          -Luis
          hi marques

          i got this from a search on your posts.

          The first thing to do is to reset the idle. The fancy procedure involves shorting the pins of the TPS plug on a warmed-up engine with the AC off to force the ICV to a fixed duty cycle, then turning the idle bypass screw untill you hit ~850 rpm.
          can i use this method? before i bought the car i remember the previous owner mentioning the t/bodies were syncd.

          if i was to set base idle would i need to adjust anything else? dont really want to knock any measurements/adjustments out of place.

          thank you.

          Comment


          • #6
            Hello mate,

            I went to "Motorsport Developments" Way up north in Blackpool! they know their stuff!

            They do Live mapping or their own chip!

            I`m well impressed with the result!

            Comment


            • #7
              UPDATE

              i just came back from work, with a nice warm engine.

              i set the base idle via the adjustment screw, i did not short out the wire harness pins on the tps? is this ok?

              anyway i started to turn the idle screw clock wise and the idle started decreasing, got it to about 800 _+ 850.

              noticed from before i adjusted the screw, the screw position was along the top, i screwed (pardon the pun) the screw down to reduce the idle.

              now any s14 experts can you tell me from what i did, can this screw up my engine?
              i simply reduced the idle using the screw on a warm engine? do i need to make any other adjustment which i dont know of?

              appreciate any input please. thank you.

              Comment


              • #8
                For the time being this will be fine. Does your engine idle remain constant under load? i.e when you put all the electrics on does it remain the same or does it drop?

                If it drops excessively the idle control valve may be kaputt and this can damage the ECU. Do a search for ICV on this forum, I'm sure there is plenty to read.

                Also, I think trhe UK spec engines are supposed to have a 900rpm idle.

                Steve

                P.S where are you in the UK?
                Sport Evo No.47

                My Sport Evo Restoration

                Comment


                • #9
                  Can someone explain the theory behind shorting out the TPS. From what I gather, this makes the ICV think it's in part-throttle mode (off-mode) so it won't try to compensate as you adjust the idle screw. But then when you reconnect the TPS wouldn't it go back to correcting the idle to what it was before?
                  "It is needless to say that self-propelling vehicles, like other machines, will never do as much for one who does not understand them as for one who does."

                  Comment


                  • #10
                    That's about the size of it.

                    Steve
                    Sport Evo No.47

                    My Sport Evo Restoration

                    Comment


                    • #11
                      Originally posted by stevesingo
                      For the time being this will be fine. Does your engine idle remain constant under load? i.e when you put all the electrics on does it remain the same or does it drop?

                      If it drops excessively the idle control valve may be kaputt and this can damage the ECU. Do a search for ICV on this forum, I'm sure there is plenty to read.

                      Also, I think trhe UK spec engines are supposed to have a 900rpm idle.

                      Steve

                      P.S where are you in the UK?
                      hey steve

                      when i turn on electrics, lights etc there no dramatic drop, its very little engine note change.
                      but when i turn the A/C on while idle the rpm drops, again its a small drop but slightly more than the noraml electrics lights, blower fan on 4 :rolleyes: confused? lol

                      another thing ive just noticed, is how quick the engine speed drops while you change gear, especially on cold, its not quick but quicker than before the idle was adjusted. ? could this be because the idle is set lower than before?

                      otherwise:-

                      start the same, 1st go,
                      better idle,
                      miltek just hums, smooth noise,
                      and not sure but maybe performance is more peeky, :rolleyes:

                      steve im round berkshire/london area.


                      thanks

                      Comment


                      • #12
                        Miles away from me in Cumbria, but there are a few specialists down that way if you are still not happy.

                        Try this....With the car idling pull the parkbrake on good and hard and put in 5th gear. Slowly come up on the clutch whilst keeping off the throttle. The Idle Control Valve (ICV) should try to maintain the idle speed. When the idle starts dropping, quickly push the clutch fully down and the revs should rise above idle and then return to idle. This will prove that the ICV is functioning.

                        Also with the engine off, put your ear to the Throttle Position Sensor (TPS) and slowly open the throttle. You should hear a faint tick as throttle moves off it's closed stop. This is the switch in the TPS that tells the ECU to turn on the ICV.

                        Steve
                        Sport Evo No.47

                        My Sport Evo Restoration

                        Comment

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