This topic contains 7 replies, has 2 voices, and was last updated by  hsv084 5 years, 5 months ago.

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  • #2064

    hsv084
    Member

    Hi All,

    Just wondering has anyone put into consideration lifting the current X275 class single turbo from 80mm to 88mm?
    In the rules section it says you can run 2 X 62mm which has approx 1450hp pontential or a single 80mm which has about 1230hp potential.
    Lifting the single up to 88mm which would level the playing field to 1450hp potential and line up with the X275 class in the US.

    Jeff

    #12496

    bln355
    Member

    Plenty of singles making closer to 1400hp, even at the current weights a 80mm turbo combo in a well setup car will smash past the 8.50 index

    #12498

    hsv084
    Member

    Having an index of 8.5 is a great idea for x275 class but unfortunately for people like me who want to join in on the action with a late model commodore or falcon that is still street rego’d, An 80mm turbo just ain’t going to cut it. To heavy of a vehicle, but that is our choice.

    #12500

    bln355
    Member

    How heavy is your car?

    #12501

    bln355
    Member

    Even at 4000lb (1800kg) you should be able to go sub 8.50 with a good single 80mm.

    #12504

    hsv084
    Member

    Would be close to 4200lb with driver and cage. With good traction might go 8.75@150ish with an 80mm turbo, It would all depend if I could get it to hook. There is a lot of weight to transition in an irs car unfortunately. If it was up’d to 88mm, Could keep the boost low of the line then use the bigger wheel to bring it home. Nether the less 80mm it is.

    #12525

    hsv084
    Member

    Have weight breaks been considered for the X275 class.
    Eg. The bigger the turbo the higher the minimum weight.

    #12018

    bln355
    Member

    Blokes have been 155mph on a 4450lb Chev a truck (brick) with a single 80mm a borg Warner on a mild 383 23 degree Chev.
    Anything running sub 9’s will be competitive on the day without a doubt. I have no doubt a mid 9 sec car if consistent could snag a win.

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