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95 Or 98?

Discussion in 'New A3/S3 (8V Chassis)' started by m2srt, Aug 26, 2014.

  1. m2srt

    m2srt Member

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    With the S3 not being your run of the mill car, is it better to run super unleaded? I know it shouldn't knock on 95 but is there a discernable difference between running on 98?
     
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  3. NotquiteWelsh

    NotquiteWelsh Active Member
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  4. A3_Rider

    A3_Rider Active Member

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    Endless debate, research and threads. So I made a thread here and will be doing what the majority do (easier that way!)

    In terms of cost its something like £160 more a year over the normal fuel.
     
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  5. veeeight

    veeeight I am a very pretty girl
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  6. Bristle Hound

    Bristle Hound Barking At The Moon ...
    Staff Member Moderator Audi S4

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    Don't search just fill with Shell V-Power & enjoy :)
     
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  7. Pulp84

    Pulp84 Well-Known Member
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    :sign omg:

    Not another fuel thread!
     
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  8. cuke2u

    cuke2u Well-Known Member

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    Groan...
     
  9. tankclark

    tankclark Active Member

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    My final thoughts are: spend 30k+ on a high end sports car and then try and save a few pence a litre on fuel? why
     
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  10. The Challinor

    The Challinor Well-Known Member
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    Momentum FTW!
     
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  11. Bristle Hound

    Bristle Hound Barking At The Moon ...
    Staff Member Moderator Audi S4

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    Noooooooooooooooo :keule:

    Not Tesco sh1te :banghead:
     
  12. steeve

    steeve Well-Known Member

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    Not the first to ask and you wont be the last....................................
     
  13. P40ULW

    P40ULW single and skint? how? oh cars!!!
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    Thats what i use! and have done im many of my cars,
     
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  14. The Challinor

    The Challinor Well-Known Member
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    I'm really not getting into this
     
  15. Gazwould

    Gazwould Well-Known Member

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    Had a map that exclusively has to use 98 ron minium.

    No det with the Momentum.
     
  16. Bristle Hound

    Bristle Hound Barking At The Moon ...
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    LOL ;)
     
  17. veeeight

    veeeight I am a very pretty girl
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    .

    Note:


    Your particular car will only benefit if it has knock sensor(s), and can advance the iginition sufficiently to take advantage of 98RON. It will say in the handbook what fuel is recommended.



     
  18. cuke2u

    cuke2u Well-Known Member

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    Lol really scientific that and so impartial...
     
  19. veeeight

    veeeight I am a very pretty girl
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    You're such a cynic ;)
     
  20. tankclark

    tankclark Active Member

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    Here's the 5th gear one

    5th Gear - High Octane Fuels:
     
  21. veeeight

    veeeight I am a very pretty girl
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    There's a much more recent fifth gear episode on this topic.
     
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  23. tankclark

    tankclark Active Member

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    Fifth Gear Fuel test:
     
  24. cuke2u

    cuke2u Well-Known Member

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    :D:jester: It's just all cars made today have anti-knock sensors, and they have variable valve timing as well..
     
  25. veeeight

    veeeight I am a very pretty girl
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    Most cars will have knock sensors
    Most engine ECU's will have the instruction to Retard the timing when knock is detected

    Not all engines will have higher than usual compression ratios
    Not all engines will have ECU instructions to Advance the timing to take advantage of higher RON fuels
     
  26. cuke2u

    cuke2u Well-Known Member

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    Kinda verifies what I've been saying...
     
  27. cuke2u

    cuke2u Well-Known Member

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    Give a gold star to that man ;) Again one of the points I was making is that, because not all cars can do this then in everyday motoring in every day cars, there is no advantage...
     
  28. veeeight

    veeeight I am a very pretty girl
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    Hence why, only S3's recommend 98RON (or better) ;)

    AFAIK all the other A3's specify 95RON on the inside of the fuel flap (can anyone provide a photo if not the case?) - with no Performance advantage if they fill with 98RON.
     
  29. cuke2u

    cuke2u Well-Known Member

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    I don't seem to remember seeing anything about using higher octane fuel inside my fuel flap, however you will hard pushed to generate any increase in power into making your journey home any quicker. Strange how everyone goes on about increases in power when it is torque that really counts. I guess it's all just pub talk.
     
  30. M1ke H

    M1ke H Active Member
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    All this talk of torque reminds me of Carroll Shelby, who once said "BHP is a measure of how hard you hit the tyre wall, torque is a measure of how far you push the tyre wall."

    The full quote was something like:

    "BHP sells cars, Torque wins races.

    or put it another way:

    Oversteer is when the rear of the car hits the tyre wall.

    Understeer is when the front of the car hits the tyre wall.

    BHP is a measure of how hard you hit the tyre wall.

    Torque is a measure of how far you push the tyre wall."

    :):):)
     
  31. Liquidfusion-S3

    Liquidfusion-S3 I fall to peer pressure!

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    A tractor has a load of torque, can't see it winning any races.... lol
     
  32. cuke2u

    cuke2u Well-Known Member

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    Err, maybe because it was designed that way? If you look at modern direct injection turbo charged engines the torque has become quite diesel like thus top speed, acceleration and mpg have all improved over larger engines that don't have the same technology but similar bhp.
     
  33. Liquidfusion-S3

    Liquidfusion-S3 I fall to peer pressure!

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    Just responding to '"BHP sells cars, Torque wins races.'

    Torque doesn't always win races
     
  34. cuke2u

    cuke2u Well-Known Member

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    Ceho likes this.
  35. cuke2u

    cuke2u Well-Known Member

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    That is correct as for their size of engine and power output the last f1 engines didn't proportionately have a great deal of torque, however the cars were very light and very powerful so bhp per ton was extremely high. But then you look at today's f1 engines, 1.6 turbo v6 with ers , similar weight, have far more torque and top speeds are far higher....
     

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