Page 1 of 2 12 LastLast
Results 1 to 15 of 25

Thread: Fuel Cut Defender, FCD

  1. #1
    I'm part of the furniture Club Member Ian C's Avatar
    Join Date
    May 2001
    Location
    England - East Anglia
    Posts
    15,114
    Feedback
    13 (100%)

    Technical Glossary Fuel Cut Defender, FCD

    Name:
    Fuel Cut Defender

    Also known as:
    FCD
    Boost cut controller

    What is it?
    It's a bit of electronics that changes the airflow signal to the ECU so that it never sees more than 1 bar of boost. This is to avoid Fuel Cut.

    Pros:
    No more fuel cut when hitting over 1.0bar of boost as the pressure signal to the ECU is clamped just under 1 bar of boost.

    Cons:
    Crap FCDs scale the airflow input so that when the stock sensor hits 1.25bar (it's maximum) the ECU gets a shade under 1.0bar. This also has the effect of scaling the ENTIRE airflow signal so the ECU always receives a lower airflow value than the engine is really getting. Messes up the whole fuelling map towards the lean end of the spectrum and is therefore highly not recommended.
    I love my job. It pays for my Supra.

  2. #2
    I'm a newbie
    Join Date
    Apr 2004
    Location
    (Top Secret)
    Posts
    19
    Feedback
    0
    hello, does an n/a have a fuel cut device as standard?

  3. #3
    Project Stealth lives! Club Member Robert's Avatar
    Join Date
    May 2004
    Location
    England - Greater London
    Posts
    5,944
    Feedback
    79 (100%)
    N/A's dont need a fuel cut device as they dont make any boost....hence the fact its a N/A ( non-turbo)

  4. #4
    I'm a newbie
    Join Date
    Apr 2004
    Location
    (Top Secret)
    Posts
    19
    Feedback
    0
    thanks, thats what i thought!!

  5. #5
    Work... what work? MEMBERSHIP EXPIRED lambertpig's Avatar
    Join Date
    Dec 2005
    Location
    England - Suffolk
    Posts
    846
    Feedback
    1 (100%)
    are there any cons for the thor unit ill be fitting next week?

  6. #6
    Never fast enough Club Member JohnK's Avatar
    Join Date
    May 2002
    Location
    England - Hampshire
    Posts
    2,945
    Feedback
    27 (97%)
    The thor unit is considered to be the best on the market.
    JohnK

    www.efter-stormen.net - Fitting a single with a budget manifold, fitting a single with a cast manifold, e-manage base map download, DIY wheel refurb. Coming soon auto to manual conversion.

  7. #7
    jedi Club Member spidermonkey's Avatar
    Join Date
    Apr 2006
    Location
    England - Gloucestershire
    Posts
    3,520
    Feedback
    2 (100%)
    oh s**t i have one of these fitted

  8. #8
    Me? Post? Never! MEMBERSHIP EXPIRED Lucifer's Avatar
    Join Date
    Oct 2004
    Location
    England - Avon
    Posts
    7,784
    Feedback
    88 (96%)
    Quote Originally Posted by spidermonkey
    oh s**t i have one of these fitted
    We can always replace it with the grddy unit next week if you like.

    PArt ex availalbe!

  9. #9
    What search button? Club Member Sandy-m2's Avatar
    Join Date
    Oct 2005
    Location
    Scotland - Lothian
    Posts
    1,515
    Feedback
    12 (100%)
    what is a good way to tell if you have one?

    PS. i cant drive the car at the moment so can only look at stuff
    I may be bad... But i'm good at it!

  10. #10
    Never fast enough Club Member JohnK's Avatar
    Join Date
    May 2002
    Location
    England - Hampshire
    Posts
    2,945
    Feedback
    27 (97%)
    check the wireing by the ECU, (pin 68 rings a bell but i could be way off, do a search) see if you have any little boxes attached.
    JohnK

    www.efter-stormen.net - Fitting a single with a budget manifold, fitting a single with a cast manifold, e-manage base map download, DIY wheel refurb. Coming soon auto to manual conversion.

  11. #11
    Work... what work? Club Member tango's Avatar
    Join Date
    Feb 2004
    Location
    England - Cumbria
    Posts
    201
    Feedback
    1 (100%)
    Hi there, when my car hit about 14-15 psi, I did some times get the sudden loss power an then back on afterward, but no warning light come on, is that fuel cut?
    If so, how much is one of the fuel cut defencer?
    cheers

  12. #12
    Supraless Club Member Jake's Avatar
    Join Date
    Mar 2003
    Location
    England - Hampshire
    Posts
    26,356
    Feedback
    22 (100%)
    Quote Originally Posted by tango
    Hi there, when my car hit about 14-15 psi, I did some times get the sudden loss power an then back on afterward, but no warning light come on, is that fuel cut?
    If so, how much is one of the fuel cut defencer?
    cheers
    Yes. My warning light never used to come on either, contary to what most people seem to get.
    Try Thor Racing's website for FCDs
    Fast, Reliable, Cheap. Pick Two.
    '03 Estoril Blue 53 plate BMW ///M3 6sp manual
    '93 Thunderstorm RZ Auto BPU 116.27mph mile Sold
    '95 Black RZ 6sp TT Sold
    '98 White VVTi Tiptronic BPU 4.993sec 0-60mph Sold
    '00 RSP VVTi 6sp GT40 single turbo 130.0mph mile 544.7 BHP, 520 Lbs/Ft torque Sold

  13. #13
    Work... what work? Club Member tango's Avatar
    Join Date
    Feb 2004
    Location
    England - Cumbria
    Posts
    201
    Feedback
    1 (100%)
    Hi Guys, I thought the fuel cut dont come in till 17psi, Im only set it at 15psi, looks like I have to reduce it, may be?
    or if I have a FCD, what psi can I go up to, mine is stock TT with manual boost controler.
    cheers

  14. #14
    I can post! MEMBERSHIP EXPIRED
    Join Date
    Sep 2007
    Location
    Latvia
    Posts
    65
    Feedback
    1 (100%)
    Quote Originally Posted by Ian C View Post
    ... This also has the effect of scaling the ENTIRE airflow signal so the ECU always receives a lower airflow value than the engine is really getting. Messes up the whole fuelling map towards the lean end of the spectrum and is therefore highly not recommended.
    Are you sure that the voltage is "scaled" in the entire range and not "clamped" after some value..

  15. #15
    Day Zero Member Club Member Alex's Avatar
    Join Date
    Jun 2001
    Location
    England - Norfolk
    Posts
    15,804
    Feedback
    13 (100%)
    Quote Originally Posted by xxcat View Post
    Are you sure that the voltage is "scaled" in the entire range and not "clamped" after some value..
    As noted it's version specific. Crap one's scale.
    - Alex

    2017 BMW S1000RR
    ex - 2012 BMW S1000RR Black
    ex - 1996 TT Gunmetal Facelift Auto, ex - 1998 RSP TT6 VVT-i BL-T61, ex - 1993 MSB TT6 w/ MINES ECU / BBS LM's, ex - 1995 S13 200SX Facelift
    ______________________________________

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •