User Tag List

Thanks Thanks:  0
Likes Likes:  0
Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: 1.8 vvt simple changes for better MPG?

  1. #1
    Regular Member
    Join Date
    May 2012
    Location
    UK
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default 1.8 vvt simple changes for better MPG?

    Hi all



    Is there a consensus on easy tweaks to make to the 1.8 vvt to maximise MPG, particularly motorway MPG? Obviously aside from keeping speed to sensible level, not over-revving etc.. Doing 1k miles next week & I am planning to keep in the 70-75mph band.

    My car is an '06 Exclusiv with 31k miles on, been owned by an old chap who did 6k miles/year so I suspect a good motorway blast may clear it out a bit anyway. I've blown the tyres up to the 'eco' recommendation in the manual. Other things I was considering;

    • Air filter - any advantage in Pipercross, K&N etc or is a new standard part the best (was changed during service 1 year ago)?
    • Different plugs? Or are new standard plugs ok?
    • Does cruise control help or should it be avoided?
    • Redex - should I use injector cleaner or could this cause issues?
    • Does 'good' vs supermarket petrol actually make any real difference? I know it can with diesel but is petrol the same?


    Any advice appreciated!

  2. #2
    Regular Member wotsthestory's Avatar
    Join Date
    Jun 2007
    Location
    Carshalton
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Consider that after you've spent money on all these (or indeed any of these) you are severely offsetting any benefit from achieving better MPG. Additive is about £7 that's a gallon of fuel (give or take), so £7 to possibly achieve more MPG doesn't necessarily make sense.

  3. #3
    Regular Member
    Join Date
    May 2012
    Location
    UK
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Hi, yeah I know what you mean but I am thinking more cleaning it out for ongoing use, perhaps only doing the Redex a couple of times a year etc

  4. #4
    Regular Member wotsthestory's Avatar
    Join Date
    Jun 2007
    Location
    Carshalton
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Regular oil changes, reduces friction, but regular servicing even if it's just the basics.

  5. #5
    Regular Member
    Join Date
    Jul 2011
    Location
    teesside
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    dont use cruise control if you are going up hills, best used on the flat roads

  6. #6
    Regular Member TonyP2020's Avatar
    Join Date
    Dec 2009
    Location
    Wirral, UK
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    The spark plugs are supposed to last 40K miles, but mine were knackered at 28K. I fitted Bosch ones with 4 earth terminals.

    Shell advanced petrol does seem to give a better drive, but not sure economy wise if its a good move.

    Cruise control is too eager to keep the speed exact, so only only use it on long straight sections. where you would take your foot off the pedal when going downhill, the car wont and It will even use fuel to slow it down. The CC needs some fuzzy logic and more attention to fuel economy of to of use when going uphill or downhill.

    I fitted a K&N and did the airbox mod. It seems better. I also drilled some 19mm holes in the plastic bit that links the airbox to the front scoop, so air can be taken from the engine bay if the engine needs it, but the cold air from the ram effect also gets to the airbox.

    Not tried any additives.

    Do you have access to the onBoard Computer (BC) or do you have just 2 buttons on the display???
    If no BC consider fitting a GID display.
    If you have BC, then reset BC1, not BC2 at the start of the journey. BC1 is easier to select than BC2 when driving.

    My daily commute is only 7 miles each way, little bit of motorway, plus shops etc., and I am currently getting about 35MPG using shell extra.

  7. #7
    Regular Member
    Join Date
    Mar 2012
    Location
    elgin
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    i drive 16 miles to work and home again, and i manage 41 mpg in my 1.8 sitting at 60 mph.

  8. #8
    Regular Member Ben50n's Avatar
    Join Date
    Dec 2011
    Location
    Seaham
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Take all of the crap you dont need out of the car! We all carry things we dont need. I pefer not to fill the petrol tank as you are effectively carryong dead weight.

    Gentle acceleration and keep below 70 mph, I have mine in CC at around 60mph, its very relaxed at that speeds.

    I dont understand why someone said take it out of CC when going downhills? My car closes its throttles as can be seen by the instant MPG reading 999.9.

  9. #9
    Regular Member TonyP2020's Avatar
    Join Date
    Dec 2009
    Location
    Wirral, UK
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    I dont understand why someone said take it out of CC when going downhills?
    Yea, I said that. I agree that it should say 999.9, but I have seen the consumption, with CC on, saying 85mpg to 125mpg on downhill section. Turning the CC off saw the reading go to 999.9.

    Was'nt that impressed either.

  10. #10
    Regular Member sheepish's Avatar
    Join Date
    May 2010
    Location
    Yorkshire
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    StatsVehicle Info
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    I asked the same question in a previous post and got some interesting suggestions. No one could confirm/deny the effect of oil/spark plugs/air filter but I will shortly try a lower viscosity oil, different spark plugs, performance air filer and maybe a warm air intake. Other suggestions were change the gearbox oil and keep your car clean, its probably worth cleaning your throttle body as well.

    But the biggest things you can do is over inflate your tyres (which you've already done), reduce the weight of your car (ditch the spare, etc.) and by far the most important thing, alter your driving style, read the tips on this web site http://ecomodder.com/ its then up to you how far you go.

    I drive at 50-56mph, very gentle acceleration, change gear at 1750rpm, turn the engine off when stationary, etc... and I can consistently get over 50mpg out of a 1.8 non VVTi.

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Might be a simple question.
    By Alank in forum Troubleshooting
    Replies: 4
    Last Post: 13th September 2011, 21:59
  2. simple question ??
    By llcoolr in forum Engine & Drivetrain
    Replies: 7
    Last Post: 14th December 2009, 17:14
  3. Simple little sum....
    By danBoy in forum The 'Off Topic' room
    Replies: 16
    Last Post: 8th February 2009, 18:56
  4. Simple whats best...
    By Danwells72 in forum Detailing and Car Care Discussion
    Replies: 4
    Last Post: 6th July 2008, 15:23
  5. PC or Mac simple as that!
    By Brocks in forum General Chat
    Replies: 39
    Last Post: 11th January 2008, 21:56

Visitors found this page by searching for:

vectra c 1.8vvt does less mpg after oil change

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
  •