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Thread: Z18XER 6 speed gearbox

  1. #1
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    Vehicle : Caravan

    Trim : Standart

    Engine : 1.8 16v Z18XER

    Year : 2007

    Default Z18XER 6 speed gearbox

    Can I build a 6 speed gearbox in my vectra c with a Z18XER engine.

    if yes.
    what do I need.

  2. #2
    Regular Member Das's Avatar
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    Vehicle : Honda Civic

    Trim : ES with Honda Image and City Packs

    Engine : 1.8 iVtec

    Year : 2009

    Mileage : 74000

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    Its never been done, its been talked about, well not that ive seen on the site. The Insignia 1.8 has a 6 speed box, so it should technically be doable as its the same engine.

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    Regular Member Chris SRi's Avatar
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    Don't think the 1.8 has enough torque to make proper use of a 6th gear to be honest.

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    Regular Member Das's Avatar
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    Vehicle : Honda Civic

    Trim : ES with Honda Image and City Packs

    Engine : 1.8 iVtec

    Year : 2009

    Mileage : 74000

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    Quite possibly as even the diesel guys notice they can get better mpg by leaving it in 5th. A 6th gear would most likely just leave the engine labouring. @Mark Evison

  5. #5
    Regular Member Mark Evison's Avatar
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    Vehicle : Astra

    Trim : GTC VXR

    Engine : 2.0 Turbo Petrol

    Year : 2015

    Mileage : 3,200

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    6th gear makes the car struggle in my insignia i get better mpg in 5th, i only put it in 6th on the motorway on a long run

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    Vehicle : Caravan

    Trim : Standart

    Engine : 1.8 16v Z18XER

    Year : 2007

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    When I drive 100 km / h in Denmark "about 60mph" in fifth gear.
    Seems I the car is very noisy and I need a gear more ..

    Think I will have great benefit of a 6 speed gear box on the motorway..
    We have a speed limit of 80mph on motorway..

    My tires are 205/55-16

  7. #7
    Regular Member Ben50n's Avatar
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    @ Kent A, to increase the gearing on your car, fit some larger rolling radius tyres.

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    Vehicle : Caravan

    Trim : Standart

    Engine : 1.8 16v Z18XER

    Year : 2007

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    My summer tires are 225/45-17.

  9. #9
    Regular Member Ben50n's Avatar
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    Here is a tyre comparrison calculator

    http://www.kouki.co.uk/utilities/vis...ize-calculator

    My car originally had 215/55/16 and I have fitted 235/45/17 as they have almost identical rolling radius.

    To increase the gearing you can try a larger rolling radius tyre, however, it will affect your speedo reading, unless the tyres are within those specified by Vauxhall.

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    The forbidden software can program a custom rolling radius for the speedo, but if your after the ultimate in MPG then fit good quality tires that are designed to save fuel with low rolling resistance, alter driving style etc, the 1.8 just doesn't have the torque to pull a 6th gear

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