Which Induction kit????

Discussion in 'K11 Tuning Mechanical Servicing and Modifications' started by pap29, Oct 18, 2007.

  1. pap29

    pap29 Club Member

    hi i have a basic k and n replacement panel filter for my k11 but want abit more power and sound so i am thinking about getting a induction kit,
    problem is i dont know what im better of getting?
    please comment on all different kits
    i want to know bout ones that look the part, ones that sound the part, ones that perform the part and the one that just takes the biscuit!
    remember to leave information such as the make and model, the price, where it can be found and if anyone got pics then bring it on
  2. ollyc98

    ollyc98 Ex. Club Member

    You could do an olly special (tho other people have done the same)

    What you do is buy a 90 degree aluminium intercooler pipe, ram it on the TB and stick a cone filter on the end.

    I'll have pics up at some point.
  3. sonic

    sonic Club Member

  4. ollyc98

    ollyc98 Ex. Club Member

    DRAINPIPE!!! love it lol. I was going to suggest it but couldn't remember who did it.
  5. sonic

    sonic Club Member

    the whole thing cost under £15, there's a few members use/have used drainpipe, I'd change it for an aluminium pipe and Samco bends, but I'm so tight that I make a ducks A-hole look porous.
  6. frank

    frank Club Member

  7. sonic

    sonic Club Member

    love it Frank, functionality over form, brilliant, What's the bend on the TB off ?
  8. Alienfish360

    Alienfish360 Awesome Dawson

    best gains are with the panel filter with a bigger supply of cold air
  9. Napster

    Napster And the Wide Green Bug

    these prices are not from ebay.....so you may find them cheaper on there

    K&N 57i Induction Kit Nissan Micra K11
    £60 - 70
    sounds good
    "Unlike other factory intake filters that restrict incoming airflow, the K&N induction kits drastically reduces intake restriction while smoothing and straightening airflow. This allows your engine to inhale larger quantities of air, enhancing usable power and torque throughout the engines RPM range. If your engine is turbocharged or supercharged, the power gains can be phenomenal."
    http://www.potn.co.uk/watermark1~POTN~images/kandn/imkandninductionkit-425x425.jpg

    green cotton
    around £70
    sound good
    "Direct Induction kits are as used by top rally teams such as Peugeot and Citroen direct from France from Europes biggest cotton air filter manufacturer"
    http://www.potn.co.uk/watermark1~POTN~images/green/imgreeninductionkit-425x425.jpg

    pipercross
    £70 - 80
    sound really good
    "Pipercross Induction kits have a uniquely designed Air Filter Inlet, made from a spun aluminium base incorporating a full raidius air inlet bell mouth, allowing air to smoothly pass into the engine inlet - maximising power output"
    http://www.potn.co.uk/watermark1~POTN~images/pipercross/im_pipercross and cleaning kit-425x425.jpg

    universal cone filter (halfords / motorworld)
    £10 - 30
    sound good

    best setup is with a cold air feed and NOT postioned on the throttle body

    napster
  10. frank

    frank Club Member

    sonic

    that bend ? i honestly ca,nt remember ! 30 ft garage full of car tat going back 20 odd yrs , lost track of whats what !!
  11. ollyc98

    ollyc98 Ex. Club Member

    Looks like a boot off sommat
  12. pap29

    pap29 Club Member

    im amazed by the drainpipe :wow:
    but anyway ive seen inductions like Retepetsir avatar and they look nice but what do they sound like and performance and how much we talking?

    so are people telling me that what ive got at the moment is the best way to do it but i need to get a better cool air feed? est way to go about cool air feed?
  13. Demarest

    Demarest Ex. Club Member

    hmm. i might have to try the drain pipe idea, looks good.
    at the moment i just have a K&N cone bolted directly on top of the throttle body, sounds beasty !!
  14. Napster

    Napster And the Wide Green Bug

    may sound "beasty" mate but you may missing out on some power......main cause heat. but then maybe not!!

    ive tryed all sorts of different positions (hey, stop the rude thoughts right now :grinning: lol) for my induction kit!

    the drain pipe was good!!! but ive changed it back now!
  15. Chrisxn

    Chrisxn Ex. Club Member

  16. Retepetsir

    Retepetsir King of Subsonic

    [​IMG]

    :)

    Edit: The previous owner (Dan - MicraCharge) tuned this intake setup for the best power and torque gains. It takes advantage of the 2nd and 4th harmonic to increase torque lower down in the rev range (it peaks between 2000 and 3000rpm, as proven on a dyno run).

    Putting a filter straight on top of the TB is pointless, and this setup gave the best gains.

    Hope that helps!
  17. Demarest

    Demarest Ex. Club Member

    yea i suppose but its just like fitting a huge big bore exhaust sacrifice some power for some Loud Noise !!!
  18. Retepetsir

    Retepetsir King of Subsonic

    Not necessarily! If you fit the right size you can see some gains :)
  19. Napster

    Napster And the Wide Green Bug

    true, but isnt "back pressure" a tiny insignificances compared to the denisty of the air entering the engine and combustion process ect?
  20. Demarest

    Demarest Ex. Club Member

    As long as it isnt too big? o_O

    Even with the K&N Cone bolted directly onto the the TB i have noticed a little more tourque and BHP, car seems more willing than before. :grinning:, but yea your right, it would be better if more cold air got to the filter
  21. ollyc98

    ollyc98 Ex. Club Member

    I cut a hole in my airpan and noticed... nothing, at all.
    So next I'm trying a £7 max power filter and see how that goes. But noise is a big thing, more important than a few extra BHP, so as long as my induction roar can be heard over my exhaust I'm happy.
  22. Stani1029

    Stani1029 Club Member

    You could have a bonnet vent directly above the throttle body, and cut a hole in the top of your air box which works as i have done this!
  23. Soixantaine

    Soixantaine Club Member

  24. pap29

    pap29 Club Member

    so the really secret to all the best inductions and airfilters is to got the best posible air to them, aka- Cold air and lots of it. BUT what is the best way to do this on the micra????
  25. Napster

    Napster And the Wide Green Bug

    best way......:

    pre-Facelift micra:
    1. make the grill an "open mouth grill" to let more air into the engine bay and feed a cold air pipe from this grill around the drivers side headlight. around the left hand side of the engine. and wrap it round so it points to induction kit on TB!

    2. feed a pipe from the bottom bumper grill around the drivers side headlight. around the left hand side of the engine. and wrap it round so it points to induction kit on TB!

    3. bonnet vent positined just above TB

    facelift:

    1. cut out bonnet slats so they are open and fit cold air feed behind. then take it around the drivers side headlight. around the left hand side of the engine. and wrap it round so it points to induction kit on TB!

    2. cut out bonnet slats so they are open and fit cold air feed behind. then stick it to the bonnet in direction of TB! then when you close it, it will sit just above the engine!! although will probably conduct heat!!!

    there are other places! (like to the right) stand back and look inside your engine bay! if you have the cold air feed pipe when you look its even better and more practical as then you "see" an idea of where it may go....and then can actually try it!!

    hope that helps
  26. pap29

    pap29 Club Member

    this is all great stuff thanks
    the feedback as been rreally good for giving me idea's and learning more.

    what if you have a standard air box like me with a k & N panel? what would be best to use for the cold air feed pipe? ways to secure pipe?
  27. ollyc98

    ollyc98 Ex. Club Member

    Get some induction hose for a stupidly expensive price, or if you wanna be cool like me vandalise your hoover and use the pipe off that. Secure with cable ties.
  28. Napster

    Napster And the Wide Green Bug


    couple of ways!

    1. keep standard air feed pipe there and add a new one from front grill round drivers headlight and cut into the airbox on top and secure in this way

    2. get two tubes of cold air feed foil and add both, one from front grill round drivers headlight and cut into the airbox on top and secure in this way the other using orignal hole but across engine bay!!

    3. have a look your self for ideas mate? try new things out! experiement! some havent been tryed some have. some people say its a good idea others disagree? trial and error! ive said before ive had tryed differnt layouts for my induction kit till i was happy!

    hope this helps again!

    naps
  29. Soixantaine

    Soixantaine Club Member

    Another Option

    I think Nissan got it right with the airbox, panel filter and the intake tubing routed down behind the headlight. The amount of incoming cool air is restricted, however, by the diameter of the tubing and opening in the airbox.

    The airbox of an Almera fits the throttle perfectly and has a 70mm intake opening and a filter that's about 50% larger than the Micra's. It is longer than the Micra's and the carbon canister gets in the way of a perfect fit. The canister can be dropped about three inches, however, with a little work on the mounting bracket. Also, a bit of fettling on the airbox bracket and hose from the cam cover and a new flex induction hose will be needed but should be easy to sort out.

    Curious about the resonator. What exactly is it there for, other than to reduce the induction noise? Can someone clue me in on this?

    S

    Attached Files:

  30. Retepetsir

    Retepetsir King of Subsonic

    You've just answered your own question.
  31. Soixantaine

    Soixantaine Club Member

    Thanks, should have phrased that differently. As in, does it serve any other function? Really should disconnect it, plug up the hole and see what it sounds like just to satisfy my curiosity.

    Also, incidentally, any opinions on the waffle-like grid inside the top of the airbox? Does it serve any useful purpose other than to strengthen it?

    S

    Attached Files:

  32. frank

    frank Club Member

    soixantaine

    the resonator helps to iron out the pulses generated in the inlet tract when the valves snap open and shut (many high performance 2 strokes have them, because of their wild timing) i think.
    my car had better low/mid range when i grafted it to my drainpipe!
  33. Soixantaine

    Soixantaine Club Member

    Thanks, Frank, low and mid-range is what I'm after.

    S
  34. GT88

    GT88 Ex. Club Member

    the bets would be the st air box with a k&n panl filter for low and mid and for high you want a ram like my kit.
    but i would think about making the eng run better then anything else. cams pistons ex.

    the eng is a air pump if you can pump the air in why have a big air intake.
    Greig
  35. Floz

    Floz New Member

    can anybody tell me if the fuel system will compensate for the additional air-flow provided by a free flow induction and what the optimum diameter/length would be for a good trade-off between air velocity/quantity?
  36. frank

    frank Club Member

    floz

    yes the ecu controls the injectors, depending on the signals from the lamda in a closed loop.
    i would say stock dia plus 50% would be plenty big enough
  37. Floz

    Floz New Member

    Thanks Frank, just wanted to know if id be running to lean.

    I'm i right in thinking the length of the induction pipe dictates the pulse harmonics, e.g Short=increased high rpm power, long= low-mid power
    hence a lot of the "off the shelf" Induction kits not producing power increase across the hole rpm range, just shifting it around.
  38. frank

    frank Club Member

    floz

    i have found that a big bore induction will help the topend but at the expense of low/midrange, thats why i had to graft the resonator back on to my drainpipe (which helps with the harmonics i think)
    i would say length is less relevant (unlike a 2 stroke expansion chamber, where the reverse cone reflects the pulses and length is crutial)
  39. Floz

    Floz New Member

    The resonator has been designed for noise reduction i know this much so i'm sure this will have no preformance advantage as sound is air moving in waves and to reduce this would reduce the air moving into the throttle body would be negative. I think the reason for for your midrange drop is the drainpipe is just to wide to get any air velocity at lower rpm. But more than plenty at higher rpm.
    Anyways sorry to blab on but i have to vent my thoughts somewhere!
  40. frank

    frank Club Member

    floz

    i agree 100% with the velocity drop/big bore.
    i always understood the resonator disturbed the pulses like the one fitted to my kawazaki kx crosser .
    because its a sealed tube any pulses are bounced back into the air flow breaking them up !
    we,ll have to do a google search eh

    floz

    did some googling and it looks like youre right !
    but in my defence check this out.
    http://www.eindiancompanies.com/images/resonator.htm
  41. sonic

    sonic Club Member

    Interesting link Frank, my nephews old 2 stroke Yamaha trial bike had a boost bottle attatched to the inlet tract, not being sure what it did we took it off and blocked up the hole, it gained more power at high revs but suffered a lot on small throttle openings.
  42. frank

    frank Club Member

    sonic

    yes, looks like it has a torque effect when fitted AFTER the carburettor but a noise reduction BEFORE the throttle body, i should,ve known better ? :blush:
    the increase in torque that mine gained when i grafted the tube to my drainpipe was probably because i left 3 inches of the old induction pipe on, and shoved it in the drainpipe eh
  43. Floz

    Floz New Member

    Ah well the point in the forum is learning from others, maybe you should add an expansion chamber to your exhaust manifold?:laugh:

    Micky taking aside i think its great you guys with home made induction kits are
    giving the kids a better option that getting robbed blind by Halfords for a shiny air filter on a rubber hose(Y)

    I think for serious N/A tuners consider my old mans bm has a 3.8ltr block and i d be shocked if the diameter of the pipe from the air box was more that 80mil and that feeds 6 throttle bodies!

    Happy days

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