Does a blowing exhaust make car slower?
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Thread: Does a blowing exhaust make car slower?

  1. #1
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    Does a blowing exhaust make car slower?

    There's something not quite right with my engine at the moment. It still feels quite fast but not quite as fast as it was.

    I've noticed that that crappy join between the downpipe and centre section is blowing a bit. I can hear it.
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    Unhappy

    yeah, when i had a hole in the downpipe i lost most of the power and the car struggled to keep above 50mph

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    Right. It will be sorted tomorrow.
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    Joy
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    Not only will it make it slower, fuel economy will aslo be affected.

    R Joy
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    Unhappy

    Yea, something to do with a reduction of pressure, My centre section is blowing a bit but its in the join so all it needs is a bit of exhaust paste. That'll be sorted some time this week (i hope).
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    you remember at santapod i was under my car with socket set, well i was tightening up a bolt in the same joint you are on about, i did most of my runs with that damn thing rasping and burping as the engine rocked between gear changes. I went to exhaust place but its still not right.

    The thread was stripped, and the thread is the downpipe side, so cant even whinge or blame the notoriously crappy sportex exhaust.

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    must be an 8v trait

    my mate had 2 8v gte's a 1.8 and a 2.0

    both either lost, snapped, or had loose bolts on the downpipe joint, causing blowing

    Its suprising who much power you do loose.

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    I was standing there tonight and it's really obvious now. Want to sort it before my rolling road visit on Saturday.
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    Yeah, exact same problem with my Nova

    Thread stripped at the centre section/downpipe joint causing blowing....Tried everything to sort it, re threading, new bolts, loads of instant gasket, nothing worked..

    Eventually the strian of it blowing was causing the exhaust to flex a little and in thew end the centre section snapped at the back and the backbox fell clean off

    Ended up renewing the centre section and obviously refitting the back box and everything is quiet again

    You really do lose a good bit of power and it does drink a good bit more fuel
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    My exhaust has actually snapped at the moment, getting the centre section replaced tonight. I have been driving it though and the performance is definately down and the fuel consumption is horrendous! Filled up my petrol tank on saturday morning and I have only done about 150 miles, the petrol needle is just over half a tank!!

    MattJ

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    Unhappy whats wrong with that?

    i rarely get more than 100 miles on half a tank

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    That is bad on my car, that equates(?) to 300 miles approx on a full tank. Before the exhaust went pop it could easily do 400+ on a good run.

    MattJ

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    if the nut is stripped, just drill them out and use normal nuts bolts and washers with the springs, but use a second nut as a locking nut when the joint is tight enough. a leak in the exhaust destroys the scavenging effect flucking up performance

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    No threads have been stripped.

    I thought it was the squashy seal thing. So I went round the motor factors to buy one. I was in the process of shininh my torch down onto the joint when I noticed a shiny patch on the exhaust pipe.
    It looks like the joint just downstream of the flex coupling is loose. So I bought some new exhaust clamps.

    About to go out and fix it. The car sounds like a tractor at the moment and is definitely slower.
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