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Thread: Placebo effect or quicker car?

  1. #1
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    Vehicle : BMW

    Trim : 320D

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    Year : 2009

    Default Placebo effect or quicker car?

    Hi guys,

    Since taking my DT UK box off, my car has obviously felt a fair bit slower/less grunt.

    Since fitting my eBay bargain Powerflow exhaust, it's felt a fair bit more grunty again?!

    Through diesel tuning experience you see VERY little difference with just an exhaust, so I'm guessing this is just the placebo effect?

    This is my exhaust..



    Cheers, Jordan

  2. #2
    Regular Member Phil881's Avatar
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    Default

    I know the feeling, I've just fitted an induction kit to my GSi

    It just seems quicker because you're using more right foot just to hear the noise for a little longer

  3. #3
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

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    the heart of diesel tuning is a good exhaust mate straight through is the way to go no cats ect

  4. #4
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

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    Default

    I don't trust the bum at all for measuring performance. I know other 1.9CDTIs have gone from completely standard to full stainless exhaust and seen no difference at all on the rollers.

    Because demand is based on torque, unless you were torque limited by lambda calculations you would not see any difference in output from the engine. Torque is damanded by the accelerator, compared to the torque limiter, converted to an IQ based on rpm, that is limited by airflow, lambda, temperatures, vehicle speed, traction control, e.t.c; the IQ is then convered into a fuel pressure and duration and fuel is delivered with VNT duty adjusted to match the rpm and IQ while also monitoring the boost pressure for demand and limits and the ECU then measures the acceleration of the engine....

    Changing any part of the engine without changing the mapping is unlikely to show real performance gains.

  5. #5
    Regular Member Teapot's Avatar
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    Vehicle : Signum

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    Default

    I tend to agree with Nutron. However intake and exhaust modifications can reduce lag by improving airflow and so getting away from the smoke limiter quicker - hence allowing maximum fuel to be reached in a shorter time after planting the throtle. But for sustained full throttle, you'll see no difference without a remap.

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    Vehicle : VECTRA C

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    Quote Originally Posted by paulvectrac View Post
    the heart of diesel tuning is a good exhaust mate straight through is the way to go no cats ect
    and one of your quality remaps as well

  7. #7
    VIP-Member Z80's Avatar
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    Vehicle : Opel Vectra GTS

    Trim : Elegance

    Engine : 2.2 DTi 16V

    Year : 2003

    Mileage : 75 000

    Default

    Free flow exhaust and intake will probably help the turbo spooling sooner (so do I actually hope), but other than that...

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