Announcement

Collapse
No announcement yet.

Modified URS6 running rich

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • S4Marc
    started a topic Modified URS6 running rich

    Modified URS6 running rich

    I have recently acquired a 1996 URS6 running circa 400whp with a Gt3071R, I'm struggling to pass the UK exhaust emissions test as it is running very rich indeed


    Parts checked so far..........(updated as I check)
    ECU coolant temp sensor
    Lambda sensor
    FPR 4bar
    Vacuum lines
    Pressure tested intercooler pipes and hoses


    Does this leave me with the MAF, MAP and FPR?

    When unplugging the MAF at idle the engine changes note and speed significantly


    I plan to fit a Wideband to see what the actual AFR is but before this any help is greatfully appreciated
    Last edited by S4Marc; 2nd July 2018, 09:03.

  • S4Marc
    replied
    Originally posted by S4Marc View Post

    This is all correct Sir

    I appreciate everyones help and input thus far as I certainly couldn't have got to this point without you guys and gals


    Getting a standard ECU and injectors is a backwards but I concur logical step.......just waiting for a reasonably priced set to turn up as it will only be used for a short period of time to prove our theory

    Tonight I will measure the resistor resisitanr to ascertain if a have an RS2 modified ECU and find a way of accessing block 000

    I can use my aeromotive regulator to get stock fuel pressure
    I checked this resistor out with a multi meter and physical inspection

    It's running AAN software

    Leave a comment:


  • S4Marc
    replied
    She's now completely legal, onto getting the old Gal remapped to allow boost again

    One advisory was surface rust on some suspension components, over winter I will be wire brushing it off and added a layer of protection




    One thing I did wonder was can the standard ECU and injectors cope with standard AAN boost pressure or is it wise to keep her safe and maintain negative or zero inlet manifold pressure

    Leave a comment:


  • Vorsprung durch Technik
    replied
    Excellent result.

    Leave a comment:


  • newsh
    replied
    Nice one

    Leave a comment:


  • Tractor Dave
    replied

    Leave a comment:


  • S4Marc
    replied
    Little update for you peeps

    A new 3" magnaflow cat has been fitted along with a wideband bung just incase it's required further down the line, aswell as a sytec adjustable FPR which is set to 4bar without vacuum

    Emissions passed!!! Not just scraped through either the CO is now 0.029%

    Just a couple of rear brake pipes to change now and she's roadworthy and working



    Thank you for all of your input so far, I literally couldn't have done it without you
    Last edited by S4Marc; 9th August 2018, 19:07.

    Leave a comment:


  • prj
    replied
    Either standard motronic with prjmod, or .... well... it's even trickier with "experts" tuning standalones
    Pick who is going to map your car and then buy the ECU they are most comfortable with.

    For me it's Ecumaster PnP, but I am not going to tune your car

    Leave a comment:


  • S4Marc
    replied
    Originally posted by prj View Post
    Yeah need to see 000 blocks, but if it's in closed loop and regulating then it should indeed be the cat.
    Get a proper big size 200 cell cat, a 5" one or so.
    Now the decision of which ECU route to go down

    I've lost faith in "experts" tuning the standard motronic

    Leave a comment:


  • prj
    replied
    Yeah need to see 000 blocks, but if it's in closed loop and regulating then it should indeed be the cat.
    Get a proper big size 200 cell cat, a 5" one or so.

    Leave a comment:


  • Colesy
    replied
    Good to hear they have done the trick

    Leave a comment:


  • Tractor Dave
    replied
    Well done. Sounds like you are getting there

    Leave a comment:


  • S4Marc
    replied
    Mild update

    Fitted a standard "AA" ECU and standard injectors which I purchased from another member on this great forum. Had no joy getting VagCom working yet to check the 000 blocks


    The CO has dropped incredibly from 7.2% to 0.6%.......this is still not a pass but extremely close. The MOT chap states that the issue now is the small "race cat" which is fitted




    This only leaves a bad map or poorly deka injectors to blame





    NB: I am very aware I must not use boost in its current setup, making sure I don't go above 1bar (absolute)

    Leave a comment:


  • prj
    replied
    Again, the test is done at fast idle (~ 2000 rpm) where the fuel pressure is most likely normal, who cares about pressure at idle?
    I mean go on, do more useless things

    Factory specs for MAF are way too conservative, because they have to account for AC on and so on. ADU over 22 and AAN over 25 = screwed.

    Leave a comment:


  • S4Marc
    replied
    Originally posted by twoqu View Post
    The reasoning behind albeit temporarily getting the fuel pressure down is to get the car back to as stock condition as possible for the MOT test. Ideally we would want the stock fuel pressure, stock injectors, stock sw and a maf that based on its history is still within spec. That gives us the maximum chance of success.
    It is a good opportunity to get a base comparsion via VCDS between the two mafs which I have suggested previously. If the OP tested the ecu to see what resistor it has then we would know which range was applicable. Not that it makes a lot of dfference as the factory specs are 15-24 for ADU and 20-26 for AAN then anything above the top limits suggests the maf.
    I understand the lambda is a new replacement.
    This is all correct Sir

    I appreciate everyones help and input thus far as I certainly couldn't have got to this point without you guys and gals


    Getting a standard ECU and injectors is a backwards but I concur logical step.......just waiting for a reasonably priced set to turn up as it will only be used for a short period of time to prove our theory

    Tonight I will measure the resistor resisitanr to ascertain if a have an RS2 modified ECU and find a way of accessing block 000

    I can use my aeromotive regulator to get stock fuel pressure

    Leave a comment:

Working...
X