Join Today
Page 2 of 3 FirstFirst 123 LastLast
Results 21 to 40 of 41
  1. #21
    Ghost Rider
    If I want your opinion, I'll
    ask you to fill out the
    necessary forms
    oblark's Avatar
    Join Date
    Jul 2005
    Location
    Romsey, Hampshire
    Posts
    4,481
    Thanks
    982
    Thanked 1,921 Times in 1,186 Posts
    Quote Originally Posted by Redbrick View Post
    You lot all commenting on your magical MPG's please tell me you're not quoting your dashboard figures!
    Where else are we going to get are mpg figures from ?

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

  2. #22
    Senior Member
    855r 6sp lives
    Ettienne's Avatar
    Join Date
    Jun 2014
    Location
    Waterlooville
    Posts
    4,554
    Thanks
    517
    Thanked 1,004 Times in 790 Posts
    Filling up at the pump, but to be fair I wasn't far off at all on the run on Saturday.

    But at least by the clocks you can get an idea if your better or worse.

  3. #23
    Senior Member
    No replacement for
    displacement!
    Redbrick's Avatar
    Join Date
    Mar 2005
    Location
    Bristol
    Posts
    1,537
    Thanks
    35
    Thanked 269 Times in 206 Posts
    Quote Originally Posted by oblark View Post
    Where else are we going to get are mpg figures from ?
    Work it out!

    http://www.calculate-mpg.co.uk/index.php?intro=known

    The dash is calibrated for stock injectors.

  4. #24
    Senior Member
    VPCUK Car of the Year 2013
    Jim
    Jamest5r's Avatar
    Join Date
    Feb 2009
    Location
    Kangaroo land
    Posts
    11,131
    Thanks
    7,069
    Thanked 5,282 Times in 3,549 Posts
    Quote Originally Posted by Redbrick View Post
    You lot all commenting on your magical MPG's please tell me you're not quoting your dashboard figures!
    My dashboard tell's me 41mpg on it's last run out, can't be arsed working it out properly just put v-power in when needed

    Edit...that's a M56L2 box with vxr injectors


    T35, 556Nm/410lbft & 361BHP/317WHP

  5. #25
    Ghost Rider
    If I want your opinion, I'll
    ask you to fill out the
    necessary forms
    oblark's Avatar
    Join Date
    Jul 2005
    Location
    Romsey, Hampshire
    Posts
    4,481
    Thanks
    982
    Thanked 1,921 Times in 1,186 Posts
    Quote Originally Posted by Redbrick View Post
    Work it out!

    http://www.calculate-mpg.co.uk/index.php?intro=known

    The dash is calibrated for stock injectors.
    The ECU works out mpg from this formula.

    X= Vehicle speed (MPH)
    Y= Engine speed (RPM)
    Z= injection time
    C= injector flowrate (lbs/hr)
    D = nr of cyliners / 2 (2.5)
    formula: X/(Y*Z*C*D*(1/6.073)*(1/3600000)*60)

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

  6. #26
    Senior Member
    a 19t just isn't laggy enough
    p fandango's Avatar
    Join Date
    Aug 2004
    Posts
    19,785
    Thanks
    4,216
    Thanked 5,021 Times in 4,072 Posts
    Quote Originally Posted by oblark View Post
    The ECU works out mpg from this formula.

    X= Vehicle speed (MPH)
    Y= Engine speed (RPM)
    Z= injection time
    C= injector flowrate (lbs/hr)
    D = nr of cyliners / 2 (2.5)
    formula: X/(Y*Z*C*D*(1/6.073)*(1/3600000)*60)
    & how many maps bother to change C?

  7. #27
    Senior Member
    No replacement for
    displacement!
    Redbrick's Avatar
    Join Date
    Mar 2005
    Location
    Bristol
    Posts
    1,537
    Thanks
    35
    Thanked 269 Times in 206 Posts
    Quote Originally Posted by oblark View Post
    The ECU works out mpg from this formula.

    X= Vehicle speed (MPH)
    Y= Engine speed (RPM)
    Z= injection time
    C= injector flowrate (lbs/hr)
    D = nr of cyliners / 2 (2.5)
    formula: X/(Y*Z*C*D*(1/6.073)*(1/3600000)*60)

    Umm thanks for that... so you understand the dashboard isn't right?

  8. #28
    Senior Member
    Yes I will be behind you but
    thats for the benefit of your
    health.
    martin_r_smith's Avatar
    Join Date
    May 2013
    Location
    wiltshire
    Posts
    995
    Thanks
    585
    Thanked 371 Times in 275 Posts
    My dash says 62.1mpg right now lol.
    854 T5 - The new project.

    850 tdi - sorely missed.

  9. The Following User Says Thank You to martin_r_smith For This Useful Post:

    daza-b (Saturday 18th October 2014)

  10. #29
    Senior Member
    Lashing it up with binding
    twine.
    Saaamon's Avatar
    Join Date
    Sep 2008
    Location
    Essex
    Posts
    1,448
    Thanks
    699
    Thanked 547 Times in 340 Posts
    On a trip i get about 700km to a full tank.

  11. #30
    Senior Member
    Blah Blah Blah!
    Volvostorm's Avatar
    Join Date
    Nov 2008
    Location
    Condover
    Posts
    4,124
    Thanks
    92
    Thanked 917 Times in 807 Posts
    I'm sure you can tell the computer what injectors to are running, might reckons I'm getting 18, which seems about right going on the mileage I clock between fuel stops.




  12. The Following User Says Thank You to Volvostorm For This Useful Post:

    oblark (Tuesday 7th October 2014)

  13. #31
    Senior Member
    OH DEAR
    t5 pete's Avatar
    Join Date
    Jul 2008
    Location
    barnsley s.yorkshire
    Posts
    12,470
    Thanks
    2,138
    Thanked 3,711 Times in 2,752 Posts
    when I had my t5 I used to work it out on trips by filling tank to brim doing the mileage the filling it to brim again always was around 35mpg.
    Also on the gauge when full dropping from 15gallon to 10gallon ide get between 150-200miles

  14. #32
    Senior Member
    This user has no status

    Join Date
    Jul 2008
    Posts
    846
    Thanks
    126
    Thanked 178 Times in 140 Posts
    There will be a correction map for larger injectors so the MPG is right. You can also play with it to get the factory crap right too

  15. The Following User Says Thank You to Dream3r For This Useful Post:

    oblark (Tuesday 7th October 2014)

  16. #33
    Senior Member
    855r 6sp lives
    Ettienne's Avatar
    Join Date
    Jun 2014
    Location
    Waterlooville
    Posts
    4,554
    Thanks
    517
    Thanked 1,004 Times in 790 Posts
    Here you go, I took this for you the other night, just to annoy you until your diesel box is fitted.

    Give or take 2,350 / 2,400 rpm is 80.
    Attached Images Attached Images  

  17. #34
    Senior Member
    This user has no status

    Join Date
    Jul 2008
    Posts
    6,300
    Thanks
    2,869
    Thanked 2,643 Times in 1,928 Posts
    Quote Originally Posted by Redbrick View Post
    Work it out!

    http://www.calculate-mpg.co.uk/index.php?intro=known

    The dash is calibrated for stock injectors.
    I tend to ignore the dash read out and calculate it based on fuel used between full ups and mileage covered, the computer reads about 37 so around 2mpg out compared to my calculations but then it is running greens and not the standard injectors. As for the calculations I get to they're based on the mileage the car has covered according to the odometer so naturally there will be a margin of inaccuracy there but then I'm sure it's not a phenomenal difference from reality and gives me a rough idea what the car is doing mpg wise.


    Gun Metal Grey - Volvo 850R - Saloon
    Thanks to Russ and team www.rtmechanics.co.uk

  18. #35
    Senior Member
    This user has no status
    GregE102's Avatar
    Join Date
    Aug 2006
    Location
    Norfolk Gt Yarmouth
    Posts
    783
    Thanks
    96
    Thanked 203 Times in 131 Posts
    I have an M66 box from the 2.4 T5 and have just done a full tank nearly the light came on and said 60 miles to empty and at that point it had done 320 miles 180 of that was cruising at 80 on the motorway the rest has been round town and A road blasts.
    For my M66 80 mph is just under 3000 rpm 70 is just over 2500 rpm.
    I will only get another 30 miles at the most before I fill up even though the computer says 60 miles to empty, It lies like a man with a forked tongue lol
    So that will be 23 Mpg for that tank of fuel, now that is a good week lol if it's town then its in the region of 260 miles between fill ups.
    Owning a modified T5 is not cheap to run, so no one should ever think it is lol Even if you fit an M66D box!
    Do what I am in the process of doing keep the 850 for when you want to go fast and to track days and get a Modern car petrol or Diesel!
    According to sat nav with a tuned 300+bhp the most I have had out of it on the Autobahn 178mph
    I Reckon I am Perilously close to 592 Bhp With all my non dangerous Mods

  19. #36
    Ghost Rider
    If I want your opinion, I'll
    ask you to fill out the
    necessary forms
    oblark's Avatar
    Join Date
    Jul 2005
    Location
    Romsey, Hampshire
    Posts
    4,481
    Thanks
    982
    Thanked 1,921 Times in 1,186 Posts
    I`ve mite have found out why my mpg is so bad,

    When setting up the AFR`s you have to remove the "lambda threshold" from the map,

    Once to AFR`s are stable the "lambda threshold" is set to 4ms across the rev range.

    At normal motorway driving the load is just above 4ms so the car goes from closed loop to open loop which can cause a high mpg.

    So tonight I`ll be raising the "lambda threshold" to 4.5ms across the rev range and hopefully this improve my mpg
    Last edited by oblark; Monday 13th October 2014 at 11:19. Reason: missed a "

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

  20. #37
    Senior Member
    Still more fettling needed,
    will it never end?
    stribo's Avatar
    Join Date
    Jan 2012
    Location
    Tadley
    Posts
    13,326
    Thanks
    2,620
    Thanked 4,587 Times in 3,404 Posts
    Another way to improve you mpg would be to fit a diesel engine.

  21. The Following User Says Thank You to stribo For This Useful Post:

    daza-b (Saturday 18th October 2014)

  22. #38
    Ghost Rider
    If I want your opinion, I'll
    ask you to fill out the
    necessary forms
    oblark's Avatar
    Join Date
    Jul 2005
    Location
    Romsey, Hampshire
    Posts
    4,481
    Thanks
    982
    Thanked 1,921 Times in 1,186 Posts
    Quote Originally Posted by stribo View Post
    Another way to improve you mpg would be to fit a diesel engine.
    HaHa.

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

  23. #39
    Ghost Rider
    If I want your opinion, I'll
    ask you to fill out the
    necessary forms
    oblark's Avatar
    Join Date
    Jul 2005
    Location
    Romsey, Hampshire
    Posts
    4,481
    Thanks
    982
    Thanked 1,921 Times in 1,186 Posts
    Quote Originally Posted by oblark View Post
    I`ve mite have found out why my mpg is so bad,

    When setting up the AFR`s you have to remove the "lambda threshold" from the map,

    Once to AFR`s are stable the "lambda threshold" is set to 4ms across the rev range.

    At normal motorway driving the load is just above 4ms so the car goes from closed loop to open loop which can cause a high mpg.

    So tonight I`ll be raising the "lambda threshold" to 4.5ms across the rev range and hopefully this improve my mpg
    I have checked some data runs and have raised the lambda threshold to 4.5ms.

    I also had a look at other parameters regarding the lambda and when you reduce the amount of Start Basic Injection Quantity to a more civilised value, you will be surprised, with the amount of fuel you can save.

    If you reduce this Delay time to lambba regulation on time as well, you will be surprised of the reduction in fuel consumption you can make for short trips, without affecting the behaviour of your tuned car.
    Last edited by oblark; Tuesday 14th October 2014 at 18:50.

    1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,

  24. The Following User Says Thank You to oblark For This Useful Post:

    Dangerous Dave (Friday 17th October 2014)

  25. #40
    New Identity
    Back in an AWD....Oh the grip!
    Dangerous Dave's Avatar
    Join Date
    Dec 2006
    Location
    West Midlands
    Posts
    8,921
    Thanks
    2,491
    Thanked 2,582 Times in 2,051 Posts
    Can't remember, is the lambda threshold a single value or is it variable across the rev range?
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.


 

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.
     
ipv6 ready