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Traction from Standing Start

Discussing the current generation Z4
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AER86
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Traction from Standing Start

Post by AER86 » Fri Jan 06, 2023 4:01 pm

Hi All,

just wondered if anybody else with a M40i experiences some traction loss when they accelerate hard from a standing start from traffic lights etc.
Using sport plus, I was a bit surprised that the car didnt hook up straight away, it definitely shifts but not before a bit of sideways movement.
I am in Canada so have the 382bhp power, so particularly curious of others experience with similar power.
I checked the tyres and they seem to have decent tread left.
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Argyll Andy
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Traction from Standing Start

Post by Argyll Andy » Fri Jan 06, 2023 5:00 pm

I’m in the Uk so slightly lower power but on a whole no, I don’t find it loses traction even under very heavy acceleration. The only caveats to that are unless the tread was down on the tyres and I don’t mean legal requirements (1.6mm here) I found anything below 3 mm livened things up immensely and also if the tyre was cold (up to 15 mins to get up to temp)

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    Traction from Standing Start

    Post by B21 » Fri Jan 06, 2023 5:58 pm

    I suspect in sport mode plus you’ve disabled the normal stability control system so it will tend to go sideways as the wheels spin , relatively uncontrolled..after a bit of sideways movement the DCS system will intervene to save you from binning it..

    I understand the MP4SS tyres fitted are bit less than grippy when cold.. :tumbleweed: :thumbsdown:
    Last edited by B21 on Sat Jan 07, 2023 10:27 am, edited 1 time in total.
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    sars
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    Traction from Standing Start

    Post by sars » Fri Jan 06, 2023 10:01 pm

    In sport plus, DSC is off and DTC is on, allowing some traction slippage and given that you have 386 lb.ft of torque from 1,500 rpm, your are going to get some slippage. You may also may feel the LSD switching between wheels, which also feels like tail is twitching.
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    Traction from Standing Start

    Post by F1SpaceMonkey » Sat Jan 07, 2023 6:55 am

    Have a UK M40i and yes, I have experienced loss of traction from standing start. The weather and temps plays a big part, obviously. Even suffered traction loss from 40mph-50mph when flooring it. Just physics i suppose.

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    StanDiego
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    Traction from Standing Start

    Post by StanDiego » Sat Jan 07, 2023 9:43 am

    Yes, you've pretty much reached the limits with the amount of torque (not horsepower) generated in the M40i in a 2WD vehicle, especially at cold temperatures. The 4 series handles it better in the AWD configuration for obvious reasons but with the penalty of added weight. It's one of the reasons I chose the s30i over the M40i. Even the s30i has enough torque to spin the wheels on quick acceleration. Wider rear tires would help a bit but not completely.
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    Traction from Standing Start

    Post by ori » Sat Jan 07, 2023 12:34 pm

    Yup. I lose traction on acceleration from standing start. It’s usually because the tyres are cold. The Michelin require temp like no other tyre I’ve had before.

    When it comes to changing tyres I think I may go for something better.

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    Traction from Standing Start

    Post by Rockhopper » Sat Jan 07, 2023 6:32 pm

    The tread pattern doesn’t give you grip, it’s just for getting water out of the way. Deep tread can actually affect handling as the tread blocks can move around, that why car racers who compete in classes that require road tyres put them in a machine that scrubs most of the tread off leaving them almost like slicks.
    If you want less sliding about you need tyres with a stickier compound.

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    Traction from Standing Start

    Post by AER86 » Tue Jan 10, 2023 2:36 pm

    Thanks everyone for the responses.

    my Z/28 had 470lb/-ft of torque through the rear wheels but it also had 305 tyres on it so hooked up quite a bit better, so i think as you ve all suggested its probably a relationship between torque and the stock tyres grip and width.

    i had contintental extreme contact on the z28 which were a good tyre, iv also had pilot supersports on a focus rs which i liked as well. For me personally with it being a summer only car i will probably switch to a more performance summer orientated tyre when i next change them and see how much of a difference that makes.
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    2011-2013: 2005 Mustang GT
    2013-2017: 2014 Mustang GT
    2018-2020: 2017 Focus RS
    2020- Now: 2019 F150
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    2022- Now: 2020 G29 M40i

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    Traction from Standing Start

    Post by B21 » Tue Jan 10, 2023 2:41 pm

    An all season tyre is going to struggle given the weight/power/drive train of the G29..

    I think a move to say Conti Sports 7s would make a dramatic change to matters.. :thumbsup:
    We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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