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    Thread: All about AFTERMARKET HEADERS & FFE.

    1. #61
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      Quote Originally Posted by targa View Post
      Wouldnt that complicate things, 4 fold ... an aftermarket ECU that runs 4 cylinders individually, how do we program that ?? (forgive my ignorance but i had never read of such extreme ecus before)
      yes it would complicate things. but I dont reckon by much. typically you take a sensor reading and associate it with all four [six, eight, ...] cylinders.

      in this case, you check which cylinder is "active" and pull readings from the sensor corresponding to that cylinder to determine the injector open time and spark advance.

    2. #62
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      Quote Originally Posted by 007 View Post
      typically you take a sensor reading and associate it with all four [six, eight, ...] cylinders.
      didnt know that !! Thank You.

    3. #63
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      Quote Originally Posted by targa View Post
      didnt know that !! Thank You.
      yeah. if you notice, there is one MAP sensor on the throttle body. its value is considered for all 4 cylinders. in reality, each cylinder might be operating at a different pressure. same thing with the O2 sensor. it is placed after the collector and the value it reports is the average of all four cylinders. lots of assumptions are in operation here. these assumptions simplify a lot of things and keep production costs down. in most cases, they also serve pretty well.

      but then you have extreme cases when nutters build high tech engines. like Keshav and his NASCAR port job on mclaren1885's Baleno. in cases like that you need to tune individual cylinders.

    4. #64
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      Quote Originally Posted by 007 View Post
      these assumptions simplify a lot of things and keep production costs down.
      If more values are tailored in then the engines might work more efficient. So, the cost of extra sensors can be justified, cant it be ? or may be it isnt worth the RnD and the production costs ?

      Quote Originally Posted by 007 View Post
      like Keshav and his NASCAR port job on mclaren1885 's Baleno. in cases like that you need to tune individual cylinders.
      Porting's been an art form, fluid dynamics. I'm glad we have people who know such things. I'm sure Independent Throttle Bodies have it way more complex and lot more effective.

    5. #65
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      Sorry to hijack this thread

      Guys. I have a doubt w.r.t the Exhaust End cans. I have a Cosworth End can in my Fiesta 1.6. The very first time I got this fitted, we removed the resonator and stock exhaust and replaced it with Cosworth end can. Drove the car for close to a month. It was too loud, though I had a baffle fitted, the car was loud (read tractor) at idling. Then, placed the stock resonator in place. The sound reduced a bit. Now, the car has a deep growl and likes being pushed.

      But, I can sense few vibrations or a kind of swaying effect (unable to get the right technical term) at speeds of 30-40km. Is this due to the end can?

      I maintain tyre pressure (Nitrogen) at 30psi.

      Gurus, please help.

      Tagging 007 and mclaren1885.
      Ertiga VXi (2014)
      Ritz VDi ABS (2012)

      Fiesta 1.6S (2010)
      Alto K10 Vxi (2010)
      Nissan Sentra 1.8S (2005)
      Swift Vxi (2006)
      Santro XG(2006)
      Alto Lxi(2005)

    6. #66
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      an exhaust will not cause issues with handling Prodigy. I'm not sure I get the effect you are trying to describe. does the car sway sideways or gently jerk back and forth?

      PS: you mind if I move our posts here? All about AFTERMARKET HEADERS FFE.

    7. #67
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      007 - Sure sir. You can move my posts.

      Yes. the car does jerk back and forth!
      Ertiga VXi (2014)
      Ritz VDi ABS (2012)

      Fiesta 1.6S (2010)
      Alto K10 Vxi (2010)
      Nissan Sentra 1.8S (2005)
      Swift Vxi (2006)
      Santro XG(2006)
      Alto Lxi(2005)

    8. #68
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      Quote Originally Posted by Prodigy View Post
      Yes. the car does jerk back and forth!
      it is a long shot but the resonator could be causing some detrimental backpressure or similar effect in a certain rev band. try replacing it with a straight pipe, driving around and checking if the jerking goes away. don't touch anything else; just the resonator.

    9. #69
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      Quote Originally Posted by 007 View Post
      try replacing it with a straight pipe, driving around and checking if the jerking goes away. don't touch anything else; just the resonator.
      Thanks 007 Let me try that out. Also, the inner layer of the straight pipe should have wool right?

      unnecessary if all you want to do is test. if that does take care of the problem, then you may want to ask somebody specializing in exhausts to calculate a resonator with proper dimensions for your engine.
      Last edited by 007; 29th Aug 2012 at 17:35.
      Ertiga VXi (2014)
      Ritz VDi ABS (2012)

      Fiesta 1.6S (2010)
      Alto K10 Vxi (2010)
      Nissan Sentra 1.8S (2005)
      Swift Vxi (2006)
      Santro XG(2006)
      Alto Lxi(2005)

    10. #70

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      My friend is looking for an end can replacement on his Alto, the end can has developed a vibration and has gone kaput (mechanic said its a regular complaint in the Alto- spot welding has given up on the end muffler) and he is looking for a cheap and best solution which can give him some decent note (not interested in performance gain..) any pointers? how much could it cost?

      Tagging mclaren1885 007

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