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    Thread: ??? Digi lag

    1. Member
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      04-07-2012 08:28 PM #1
      I believe i have what is know as digi lag. My ques is does anyone have suggestions on correcting or fixing this. I know i can adjust the MAF sensor screw. Will that be sufficient or a waste of time. and is there anything else i can do besides a swap? Thanks
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    2. Member B4S's Avatar
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      04-07-2012 09:28 PM #2
      the only way to eliminate digi-lag is with a chip.
      Negative scene points

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      04-07-2012 10:19 PM #3
      I have the digifast chip. Maybe another issue? When i go to take off in first. It doesnt want to move. It takes a while to get up to 2000 rpm then finally picks up. Same thing if say im taking a turn in second and then mash the throttle to pick up speed. It doesnt wanna move like im tied to a tree.
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    4. Member ps2375's Avatar
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      04-08-2012 01:32 AM #4
      Do you have the timing set correctly?
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

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      04-08-2012 12:25 PM #5
      Almost 100%. Does that sound retard or advace to you?
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    6. Member ps2375's Avatar
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      04-08-2012 12:27 PM #6
      It sounds like it is retarded. Hence no power.
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

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      04-08-2012 12:45 PM #7
      So that produce no power at low rpm or all the way through
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    8. Member ps2375's Avatar
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      04-08-2012 12:55 PM #8
      reduced power at all engine speeds, but more pronounced at low rpm's cause the ecu is adding less at low rpm's.
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

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      04-08-2012 12:59 PM #9
      K im gonna go mess with it. Ill let u know. Thanks man
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    10. Member ps2375's Avatar
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      04-08-2012 01:02 PM #10
      Don't "mess with it", set it following the proper procedure. I have not had to deal with many digi cars, but I do know that it has a specific procedure for setting the timing, and if that is not followed, the timing will be wrong.
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

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      04-08-2012 01:55 PM #11
      Quote Originally Posted by duscrub20 View Post
      I have the digifast chip.
      The DigiFast chip will not fix the lag. In fact no home brewed trick will fix it as it is programmed into the ECU. There are two chip sellers that I know of that know what causes the lag, explain it to their customers and sell chips that are supposed to remove it. SNS is one and AK Racing is the other, maybe there are more. The chips are not cheap, AK is about 450 and the SNS I don't know, but if they correct the problem I guess they are worth the money. Both companies advertise there products for Digifant I, but the programming is I believe is done to all Digifant based systems, Digifant II and DigiJet. I am still waiting for a 100% positive answer to that part.

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      04-08-2012 02:29 PM #12
      I advance the timing a lil bit by using the didtributor. It helped a lil but now im pinging. I already run 93 in it so im not running 110. Maybe ill just back it back off and leave it alone. I pulled the plastic cap off of the MAF. Which screw do you adjust the phillips on top or the bolt on the side.
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    13. Member ps2375's Avatar
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      04-08-2012 03:00 PM #13
      There is only one method for setting the timing on digifant, did you use that method? It is described in detail in the Bently Manual for this car.
      Tradition is the art of making the same mistake repeatedly, on purpose.

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      04-08-2012 03:39 PM #14
      you have to do the timing a VERY specific way. its not like setting the timing on an old VW, or a small block chevy..

      you gotta dis-connect the blue CTS
      rev the engine past 3k rpms 3x
      stand on your head
      shotgun a beer
      pull out timing light
      fart
      set timing to the mark, and there should only be one mark on a DIGI flywheel
      curse your timing light because its not working right
      throw timing light across garage
      tighten down your distributor
      and your done!!!

      seriously tho, with digifant, if you dont set the timing to the spec the computer tune is set up for, then it can NEVER run right. because the ECU knows that timing should be set to 6*, and when its not, it freaks out..

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      04-08-2012 07:10 PM #15
      Best info ive got ever shotgun a beer. I knew thats why i couldnt get it right!! Nah. Thanks man your info is spot on from what i just read in the bentley. What a pain in the ass. Never used the timing gun on mk2 vw. Mostly pretty easy to get i right without it. But im gonna try doing it the right way. I have it dialed pretty good now from trial and error. But i want it perfect. Thanks for the motivation
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    16. Member ps2375's Avatar
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      04-08-2012 07:52 PM #16
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

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      04-09-2012 03:13 AM #17
      Quote Originally Posted by duscrub20 View Post
      . . . What a pain in the ass. . . . But im gonna try doing it the right way. . . But i want it perfect.
      Yes, "setting the ignition timing on Digifant" is a messy procedure and time consuming. But it is just that, setting the ignition timing and has nothing to do with minor adjustments. Once the basic setting is done you can make minor adjustment just like any other car. After all, the ignition distributor is really no different from many other VW models and the ECU does not and has now way of knowing the degree of advance you have set it to. Digifant seems to work just like the other VW engines in these year cars in that 8 - 10 degrees works better that the factory 6 degrees.

      Problem is that the lag can not be removed by playing with timing or mixture. Yes you can mask it a little and reduce the feel by doing some tinkering, but it will always remain. It is in the programing and not the fuel or ignition timing MAP. VW programmed the system to keep reading the Lambda sensor (O2 sensor) for 1 to 3 seconds after the wide open throttle switch has been activated. At that point it will go into open-loop and run off the programmed MAP for fuel. Once the WOT switch has been released it "re-sets" and the next time you go full throttle it does the delay again. Some kind of safety feature I guess which was maybe well intended but stupid.

      "I pulled the plastic cap off of the MAF. Which screw do you adjust the phillips on top or the bolt on the side."

      I suggest you please do a search and read up on this before going any deeper. It does have an effect on system which use vain type air flow meters but with everything in life there are two sides to every coin. Before you make a mistake which can not be corrected, read a few articles and be sure of what you are doing.

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      04-09-2012 01:44 PM #18
      Wbat you are describing does not sound like typical Digifant lag.

      Vacuum leaks? Does it do it cold and hot?
      I really suck at smog.

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      04-09-2012 06:29 PM #19
      I do alot of reading and research and asking and trying. I think i went to far into this to get rid of lag. The timing is good. Its just that lil tinkering to get it perfect. If the lag i feel cannot be eliminated due to a stock map at WOT. then i consider it to be running perfect. Throttle response was good and and got a little better by turning the gear three clicks in the MAF. The reason imgoing to far is i just want it dialed in before i throw my 2.0 16v on digi in my car thats all. Im not an engineer but i have plenty of experience with mk2. Ive done 16v digi once before and i have everything laying around to do it again. I want that xtra 30 HP im not getting with it on the eng stand. Thanks for all your helps guys.
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

    20. Member
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      04-10-2012 12:03 PM #20
      Quote Originally Posted by duscrub20 View Post
      I do alot of reading and research and asking and trying. I think i went to far into this to get rid of lag. The timing is good. Its just that lil tinkering to get it perfect. If the lag i feel cannot be eliminated due to a stock map at WOT. then i consider it to be running perfect. Throttle response was good and and got a little better by turning the gear three clicks in the MAF. The reason imgoing to far is i just want it dialed in before i throw my 2.0 16v on digi in my car thats all. Im not an engineer but i have plenty of experience with mk2. Ive done 16v digi once before and i have everything laying around to do it again. I want that xtra 30 HP im not getting with it on the eng stand. Thanks for all your helps guys.
      the 16v is going to need a different, more aggressive tune anyways.. so your kinda wasting your time tuning the 8v, if you ask me..

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      04-10-2012 08:11 PM #21
      Ease up cowboy im takin my time! My MS is being wired together in the meantime!
      Trades: The only trade I値l consider will be a Mk3 Golf or Jetta with cut springs, steelies, and a rusted hood. If you have this I値l give you this car plus $5,000. Thanks for looking.

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