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Fuel economy?

Discussion in 'Performance' started by Jenny Frappell, Oct 7, 2016.

  1. cbus

    cbus Well-Known Member

    Messages:
    13,362
    Location:
    sunshine coast
    Thanks Barry.
    I had trouble copying a link once downloaded.

    Chris.
    I'll go thru it this evening.
    Basically confirmed nose down attitude but rear diffuser not a benefit on a square back unless some camm effect can be created to balance.
    Smoothing underneath should still be worthwhile as the very messy chassis members are playing havoc with linear flow.
    Keeping air attached at sides and top worthwhile and a couple of things to note there.
     
    chris taylor likes this.
  2. bern

    bern Well-Known Member

    Messages:
    1,193
    Location:
    Fernvale, Qld
    Heard a few times red cars are faster too, he he
     
  3. David H

    David H Well-Known Member

    Messages:
    6,562
    Location:
    newcastle
    Do twin water tanks comprise a smoother underflow? They sit below the cross members & make it look smooth for air flow from the front.
    Cheers
     
  4. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    Not true ,,,,,,,, pink ones are though,,:p:p:oops:
     
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  5. cbus

    cbus Well-Known Member

    Messages:
    13,362
    Location:
    sunshine coast
    More a believer in ' wynns' stickers. :)
     
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  6. Grantus

    Grantus Well-Known Member

    Messages:
    18,094
    Location:
    Southern ACT
    I have noticed if you mount a red “P” plate to a vehicle............it seems to go faster. :confused:
     
  7. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    4,411
    Location:
    Seven hills
    Mount any colour plate on and they seem to go faster.
     
    bern likes this.
  8. KahunaKombi

    KahunaKombi Super Moderator Staff Member

    Messages:
    22,222
    Location:
    Bracken Ridge, Qld
    Good to see they maintain the level in Qld also ....... but then they did have a flexibility/allowance if exceeding the speed limit on their driving tests :eek:o_O
     
  9. Jurgen Grossmutter

    Jurgen Grossmutter Well-Known Member

    Messages:
    625
    Location:
    Ipswich
    My 90 Transporter was the Wynn's Rep car for Coffs and Port!
     
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  10. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    Did it go faster cos it was a Wynns,
     
  11. Jurgen Grossmutter

    Jurgen Grossmutter Well-Known Member

    Messages:
    625
    Location:
    Ipswich
    Out past Narranderra or Dubbo it did 145kmh.
     
  12. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    Prior to my trip to Remark n back I decided to make it a fuel usage check as well .
    So fueled up just prior to leaving making sure it was done on level ground ( some servo,s are not level ), and continued this process throughout the trip . After working it all out I afterwards I did 720 Klm and used 85.67 ltrs which which gave me a return of 8.37 klm per ltr. Now I still work in mpg so going a step further deviding the klm by 1.6 it worked out at 450 miles and deviding the ltrs 85.67 by 4.5 it worked out at 19 galls then deviding that into the miles it works out at 23 .67 mpg which is in my opinion it not bad or in klm 8.4 kpl ltr.Now in reality if this is correct (as im sure it is ) one should be able to do 470 klm per tank.
    Just something to think about .I know we all say fill up every 300 KS and i do as well so I'm just posting this for all to think about .
    Cheers Chris.
     
    Last edited: May 31, 2021
  13. Barry

    Barry Well-Known Member

    Messages:
    5,713
    Location:
    Abbotsford NSW
    That is about right in my opinion
    I wouldn't be going anywhere near 400kms per tank
     
  14. cbus

    cbus Well-Known Member

    Messages:
    13,362
    Location:
    sunshine coast
    About average for bays. :)

    I usualy fill every 400 on a trip.
    Spaces out the stops and always picking the prices on inland runs.
     
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  15. tintop

    tintop Well-Known Member

    Messages:
    920
    Location:
    Canberra
    Hi Chris, all my figures are litres per hundred kms - yours works out as 11.9 litres per hundred kms.

    I've kept records for a while and they vary depending on conditions (hill, wind etc.) for example one trip to Sydney I had a tailwind and used 11.3 litres per hundred km and on the way back I used 13.5 litres per hundred kms.

    Around town I use a bit more again...I still fill up at about 300km

    Patrick

    l/hkm potential distance
    11.51 487
    12.55 446
    13.36 419
    12.24 457
    13.39 418
    11.42 490
    12.14 461
    14.41 389 low
    13.33 420
    14.37 390
    12.32 455
    12.88 435
    11.22 499 high
    14.29 392
    14.10 397
    11.67 480
     
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  16. Mordred

    Mordred Super Moderator Staff Member

    Messages:
    2,979
    Location:
    Penna, Hobart
    My recent trip with a 2litre with twin IDF Webers and a monster exhaust in a 72 crossover pop top with a bull bar/tyre on the front and fully laden getting an average of around 13 litres per hundred km over 6500km of mostly highway running. I don’t reckon that is too bad an average.
    My 2 litre with standard solex carbs in good condition and with 137.5 main jets (I think I remember the standard ones are 132.5) which mean they run a little rich around town but better on the highway, and a standard exhaust runs an average of 12.5 over the past 30k km. I have a tin top and no bull bar or roof rack, so relatively clean airflow, but often with a fair load on board.

    The 1800s I have had tend to run about a litre or so less per hundred km. Their final drive is a bit shorter so they tended to rev a little higher for the same speed.

    Adrian
     
    Last edited: Jun 1, 2021
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  17. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    Well at 11.9 l p hundred i have to be happy with that tin top.
     
  18. MeMatt

    MeMatt Active Member

    Messages:
    121
    Location:
    Woonona
    What about a 1600 pushing a 77 bay….
    Most of my weekday driving is over 80kph. Bus feels like at 90kph it’s doing over 4000rpm. Makes me think it’s using a lot of fuel. On average I get 300kms at the red empty zone and about 12L/100…..
     
  19. Barry

    Barry Well-Known Member

    Messages:
    5,713
    Location:
    Abbotsford NSW
    I would be happy with that Matt
     
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  20. MeMatt

    MeMatt Active Member

    Messages:
    121
    Location:
    Woonona
    I am… being a flying brick that hates a cross wind, didn’t buy the kombi for fuel economy!
     
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