Chris NottMonster Motorsport
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  1. #1
    mattyboy199's Avatar
    6th Gear

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    Best Fuel additive ?

    Whats the best stuff to raise the Octane rating. I ve heard the stuff in Halfords is a load of rubbish.
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  3. #2
    1animal1's Avatar
    The Clar!! it mouves!!!

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    i saw a test conducted on TV where they setup a Rover K series engine under strict conditions, trying all of the 'main' additive brands...and it showed alomst no change...infact, a couple gave negative results!!

    Not sure what it would do on this engine with it being turbo'd and uprated..... I am actually apprehensive about touching any additive now after seeing that
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  4. #3
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    yea that was on 5th gear and they said that all additives actually gav a decrease in power by 2%! id leave the additives and just go for the optimax!

  5. #4
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    Millers CVL and CVL plus are octane boosters that do seem to work, as well as Silkolene Proboost, but be aware of the possibilities of MMT fouling when using them. (dirty plugs etc)

    But you would need your car mapped to suit any increase in octane to be able to advance the timing in the midrange for more torque. On a stock engine you would see little benefit apart from perhaps some increased "smoothness".

  6. #5
    S3 Dave's Avatar
    Now running on Heavy Oil

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    Try BP ultimate "102" if you can find it...........
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    Churchill August 20th 1940

  7. #6
    ANDYTQ's Avatar
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    Millers cvl works for me with ignition timing altered with sps3 to suit,only used a couple of times a year to avoid cat damage,millers normal octane boost can be used all the time.
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