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New Front Tyres, ESP Warning Light & Turbo Lag Problems!

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  • New Front Tyres, ESP Warning Light & Turbo Lag Problems!

    Hi people, sorry if this has been covered before. I've just had my front 2 tyres replaced, 215/35/r18's. Loving the lower profile but the way. However, I noticed when I was heading home the ESP light is flashing for no reason. Normally it flashes up when I hammer it and cars struggling to grip, obviously... but now it's just flashing when I'm crusing along in 6th doing 40mph.

    I noticed when I put my foot down aswell, it's casuing the turbo to lag like **** so I pressed the dash button to deactivate and it was fine... At first I thought they might have hit something under the car with the jack...

    Any idea's people?

    Thanks in advance for the replies.

  • #2
    Y did u change the size for?
    Astra VXR GTC, Summit White, Aero Pack, Performance Seat Pack, AFL's, Sat Nav, Climate Control, Tints! SOLD

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    • #3
      Why would you change your 2 fronts to 215 and keep your backs 225?

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      • #4
        The ESP system works by comparing wheel speeds using the ABS sensors, so any difference in wheel speed will fool the system into thinking that there is a loss of traction/deflated tyre, and cause it to try and intervene. I suspect your problem will remain until you make sure that all four tyres are the same size.

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        • #5
          You haven't changed the profile.

          Standard profile is 225/35/18 so you have only changed the width which will make very little difference.
          M135i

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          • #6
            Originally posted by iDan x View Post
            You haven't changed the profile.

            Standard profile is 225/35/18 so you have only changed the width which will make very little difference.
            the 35 is a % of the width - so there is a difference in rolling radius of 1.15% or 22mm per rotation

            Astra

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            • #7
              You wheel speed sensors are picking up that the front wheels are rotating faster than the rears due to the smaller tyre being fitted. Got 2 options, change the front tyres back to the correct size or change the rears to match the front.

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              • #8
                Originally posted by IanJ View Post
                the 35 is a % of the width - so there is a difference in rolling radius of 1.15% or 22mm per rotation
                This is correct !

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                • #9
                  Originally posted by IanJ View Post
                  the 35 is a % of the width - so there is a difference in rolling radius of 1.15% or 22mm per rotation
                  +1
                  Astra VXR GTC, Summit White, Aero Pack, Performance Seat Pack, AFL's, Sat Nav, Climate Control, Tints! SOLD

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                  • #10
                    I've changed the front 2 as the previous owner out 40's on all round. I plan on changing the rears ASAP.

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                    • #11
                      Thanks for all the replies, gents. New tyres are getting fitted tomorrow!

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