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Thread: Tech 2

  1. #1
    Regular Member padawun's Avatar
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    Default Tech 2

    Re a thread that I posted recently, I will be
    changing tyres on my from 215/50-17 to 225/45-17.
    Does anyone have access to a tech 2 to calibrate the ecu
    for me.

    Many thanks.

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    Regular Member P3tchy's Avatar
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    Those tyres are the same rolling radius.... why would think you would need to calibrate the ecu????

    215 = Width in mm's
    50 = Aspect ratio (side wall height) of 75% of the width
    17 = You take a guess.

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    also the tyre info is stored in the clocks

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    Default

    Quote Originally Posted by P3tchy View Post
    Those tyres are the same rolling radius....
    They're not.

    There is a marginal difference between the 215/50/17 & 225/45/17 size.

    Plug the sizes into any tyre calulator and you'll see the difference.

    Since fitting 225/45/17's on th front of my Vectra, my speedo now reads slightly more than it did previously when 215/50/17's were fitted.

    When I asked the garage to change the settings via Tech2, they told me the setting is the same for both sizes of tyre. Someone on here said it's not though (possibly Plasma, but could be wrong).

  5. #5
    Administrator plasma's Avatar
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    Default

    Quote Originally Posted by padawun View Post
    Re a thread that I posted recently, I will be
    changing tyres on my from 215/50-17 to 225/45-17.
    Does anyone have access to a tech 2 to calibrate the ecu
    for me.

    Many thanks.
    If Ian and myself have our usual 'Lakeside' meet just the other side of xmas for them bargain sales I'll be in attendence with the tech2
    Plasma's Tech2 services are now open and able to provide services

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    Regular Member Tadpole's Avatar
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    Quote Originally Posted by plasma View Post
    If myself and Ian have our usual 'Lakeside' meet just the other side of xmas for them bargain sales I'll be in attendence with the tech2
    Quote Originally Posted by plasma View Post
    If Ian and myself have our usual 'Lakeside' meet just the other side of xmas for them bargain sales I'll be in attendence with the tech2
    So good he told us twice well it is a tech two ...................

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    Regular Member Lao's Avatar
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    Default

    Anything between 0 and 2.5% difference is acceptable.

    Try this calculator:
    http://www.rims-n-tires.com/rt_specs.jsp

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    Regular Member padawun's Avatar
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    Quote Originally Posted by plasma View Post
    If Ian and myself have our usual 'Lakeside' meet just the other side of xmas for them bargain sales I'll be in attendence with the tech2
    Many thanks, I will have to get the MOT carried out in December, but will leave
    changing the tyres until later, the old ones should be oaky for a couple more weeks!

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    Don’t forget, just because you change tyres doesn’t mean your speedo will be ‘out’; it might be ‘out’ with the 215’s and putting the 225’s on makes it go more ‘in’ ?!?!

    Do a test – stick cruise on at 70mph and see what speed a sat nav is telling you (CD70 can tell you speed in test mode).

    Also don’t forget as tyres wear, their circumference reduces.

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    Regular Member Ste's Avatar
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    Does CD70 use speed from the same sensors and tyre size data that speedo works from, if so, it will only show up speedo inaccuracies. Sat Nav will be much better to get accurate road speed. Or is CD70 a sat nav system???

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