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Thread: exhaust pressure

  1. #1
    Regular Member LAV6Y's Avatar
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    Default exhaust pressure

    Can anyone shed light on this:

    MESSAGE: I have just purchased a Vauxhall Omega 2.2 DTi CD 4dr manual, decently speedy @ about 125bhp and 205lbft torque and one of the jobs i would like to do at some point is fit a perfromance exhaust system from the cat or maybe just the backbox, to improve both the look and sound of my new mile munching luxobarge Thing is, im not 100% sure about the tech' side of things...ive read somewhere that removing back pressure from an engine that produces its torque in a narrow band (like DTi's do) can destroy the torque and power delivery...but i also read that on Turbo equipped car's, removing all back pressure helps the Turbo spin up quicker and delivers much more power...anyone shed any light onto the issue? Many thanks

    I have just cut and pasted it from powerflows site and there were no replies to it. I'm asking cause i'm thinking of changing the back box on my DTI and i would imagine the same would apply to my veccy.

  2. #2
    Regular Member parapaul's Avatar
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    AJA has a cat back system on his CDTi....i think....

  3. #3
    Regular Member dervdoc's Avatar
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    well iv a straight pipe on my wagon from the turbo to the rear where iv a y piece fitted with 2 magnex rear silencers with a 4inch slash cut exit,(all stainless) need to put her on the roaling road to see exactly what gains are achieved but ''_ZS_'' has his 2.0dti astra decated etc.. producing 6bhp and 40lbs of torque i think
    as for my 2.0dti yes i think ya can notice a difference in acceleration and she diffinately sounds absolutly brilliat for a derv

  4. #4
    Regular Member LAV6Y's Avatar
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    where did ya get the work done derv and for how much????
    as you know i'm not too far from ya

  5. #5
    Regular Member dervdoc's Avatar
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    right well i got the y piece from roarrunner motorsport england, was£260 delivered and fitted myself(bought back splitter from jdl to suit dual exit), then went to dee's exhausts near the abbey centre and got the straight pipe done for £110 but make sure and keep your CAT as they will try and keep it to sell it on m8 so the hole lot set me back £370, as i said i need tor put her on the rolling road and see what she shows in increase/decrease(hopefully not a decrease but it can surprise ya some times m8)

  6. #6
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    I gained 6hp and 49lb/ft by removing the cat off my 2.0Dti and replacing the 2" system with a 2.25" system

    Torque is mad now, 204lb/ft at 1530rpm - should be 170lb/ft.

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