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Thread: Rear suspension

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    Rear suspension

    IRS(sierra or BMW) V.s Soild axle(english) what r the benefits n disadvantages of both??

    tarmac n circuit race car with full race xflow.

    looking for a good setup for the rear of my new car.
    1973 mk1 escort
    1982 Toyota corolla ke70
    1988 mk4 escort

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    Re: Rear suspension

    might have to move this to the chassis section.
    1973 mk1 escort
    1982 Toyota corolla ke70
    1988 mk4 escort

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    Way too much free time Decade Plus User Retromotorsport's Avatar
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    Re: Rear suspension

    Nope move it to the muppets... the BMW rear suspension is better than the Sierra one, but its heavy... both would require a lot of fabrication for very little gain. The problem with passenger car suspensions is they are not designed for race cars, they have a lot of compremises built into them, ie rear passengers. A race car rear IRS has the upper and lower wishbones almost meeting in the middle, which would mean attaching them to the middle rear seat passengers hips.

    The Sierra has terrible camber control, and also toe problems when on droop. the BMW has the same, but not as much. And the idea behind the weight saving on unsprung weight goes right out the window when you weigh the componants on both cars. I had to rebuild the diff mounts in a M3 that had ripped them out, that BMW rear end is seriously heavy

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    Re: Rear suspension

    ok...there is a mk1 escort here with IRS so was jus wondering, why he might have done it cause i was considering it also. But the weight of it turns me off.
    1973 mk1 escort
    1982 Toyota corolla ke70
    1988 mk4 escort

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