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    Quote Originally Posted by clearhope36 View Post
    its all in ya head ,, no difference in performance im sure
    Oh please God no, not again!
     
     

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    I run mine on either Tesco Momentum or Shell V-Power all the time. For the extra few pence, it's worth it in my opinion, if only to keep things a little cleaner.

    It's one of those things that you really don't notice much of a difference until you then get low on fuel and have to fill up with standard petrol after using premium for months. Then it's definitely noticeable!

    It won't make a difference on a lot of cars, but it does say in the owner's manual of mine to run it on premium if at all possible for best performance, so that's what I do.
    ~ Steve

     
     

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    Quote Originally Posted by Foxy328 View Post
    I run mine on either Tesco Momentum or Shell V-Power all the time. For the extra few pence, it's worth it in my opinion, if only to keep things a little cleaner.

    It's one of those things that you really don't notice much of a difference until you then get low on fuel and have to fill up with standard petrol after using premium for months. Then it's definitely noticeable!

    It won't make a difference on a lot of cars, but it does say in the owner's manual of mine to run it on premium if at all possible for best performance, so that's what I do.
    Couldnt agree more, it doesnt cost that much more, is better for the engine and there is a noticable difference when on a full tank! i only use V-power

    1991 E34 518i
    1994 E36 318i se Project
     
     

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    True, it won't matter one bit if the ECU has not been tuned for it.

    On a turbo car, it makes more sense as it reduces the possibility of detonation

    Quote Originally Posted by clearhope36 View Post
    its all in ya head ,, no difference in performance im sure
     
     

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    Quote Originally Posted by anees View Post
    True, it won't matter one bit if the ECU has not been tuned for it.

    On a turbo car, it makes more sense as it reduces the possibility of detonation
    isn't that what the knock sensors are for so the engine can adjust itself accordingly for whatever grade of fuel being used
     
     

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    5th gear did a test where they tested 3 different grades of petrol on 3 different cars and it did make a difference on the golf gti and impreza but it made no difference on the clio

     
     

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    Quote Originally Posted by anees View Post
    True, it won't matter one bit if the ECU has not been tuned for it.
    Modern ECU's are adaptive, thats why we can remap rather than having to 'chip' like the old days and thats why it takes a few tankfulls and then regular use of higher octane petrol to have any effect.

    Quote Originally Posted by anees View Post
    On a turbo car, it makes more sense as it reduces the possibility of detonation
    This is true but the benefits are not to be ignored on n/a cars.

    Quote Originally Posted by mark beardmore View Post
    isn't that what the knock sensors are for so the engine can adjust itself accordingly for whatever grade of fuel being used
    Correct, thats what knock sensors are for but too much timing pull (correction factor) from using cack petrol is a bad thing. Using higher octane fuel reduces knock and therefore timing pull, fact!
     
     

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    Have used the Tesco Momentum and whether imagination or not the car does feel smoother and more responsive, not much change mpg wise but have not measured over long period.
     
     

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    bmws use vanos aswell, which alters the timings which is a benifit when using good fuel!, also bm 6 pots are designed to run best on high octain fuel. The test was on a car that is designed for ecconemy and can't adjust for different grade fuel. also even the turbo cars need re tuning to match the higher fuel. and the proof that a high performance na car like the golf also had improvements!, the torque figuare was also an improvment!
    it reminds me of the test they did on fuel additives, and not 1 of them did the cars bhp any good!, infact they all zapped power as they altered the mix to much!!!
     
     

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    i know what you mean theres one tesco and i found a shell garage friday, and by the way a 330 is 220bhp on normal unleaded the e46 is clever enough to tell the difference
     
     

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