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Thread: Anyone with duel exhausts on their DTI?

  1. #1
    Regular Member Innes's Avatar
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    Default Anyone with duel exhausts on their DTI?

    I may have an opportunity to upgrade my 2.2DTI SRI from a single to a duel exhaust system from a 3.2 GSI.

    I was wondering if anyone else has done this to their DTI as I have heard that it could potentially make the low-down accleration SLOWER.

    Something to do with the exahust back presuure?

    I just wanted someones feedback on how they got on with theirs and if they noticed any ill effects?

  2. #2
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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9CDTi

    Year : 2005

    Mileage : Lots

    Default

    Mine needs a few more revs to get going but after a while you don't notice it, then again mine has no middle box either.

  3. #3
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

    Engine : Petrol

    Year : 2003

    Default

    I have a quad exit exhaust on my 2.2DTI with the de-cat mod and it has increased performance.
    Your original catalytic converter will typically have 400 or 600 cells per square inch (cpsi), these original cats are restrictive in their flow, typically allowing an open area of around 55-65%.

    A Hi-flow Sports Cat which can be fully integrated into a large bore downpipe, has only 100-200 cpsi depending on application. These cats have an open area of between 75-85%, thus reducing back pressure substantially and increasing flow rates, all very desirable for extracting more performance, especially on turbocharged engines.

    Removing the cat does much the same thing, reduces back pressure = more power?

    I spoke to the bloke from OX Power tuning the other day (I'm looking to put my car on the RR they have). After several questions I then asked him what sort of gains can be made by just the de-cat alone? To which he told me and I quote "you can expect around 14 BHP". He then went on to his pc and showed me the graph just with the de-cat, before and after results. The car was an octavia TDI. The increase was indeed 14 BHP. I have seen this with my own eyes so I'm sold on the de-cat mod. Just as well as I have done that very mod a good while back.
    Last edited by Signum-Steve; 18th August 2011 at 13:30.

  4. #4
    Regular Member Innes's Avatar
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    Default

    I was wondering weather to decat if there needed to be back pressure for the turbo with a duel exhaust

    So you are saying do a decat and have the exhaust and I should see gains? What about the enitial lowdown grunt. Does that improve or weaken?

  5. #5
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

    Engine : Petrol

    Year : 2003

    Default

    Quote Originally Posted by Innes View Post
    I was wondering weather to decat if there needed to be back pressure for the turbo with a duel exhaust

    So you are saying do a decat and have the exhaust and I should see gains? What about the enitial lowdown grunt. Does that improve or weaken?
    Your turbo will spoole up sooner, mine does. If anything I have found improvements low down too. I also have done the airbox mod with a pipercross filter just to help with air flow.

    These are my findings with my car. When I put the car on the RR I will post the results.
    I estimate my car to be running at 139 BHP at the mo. The RR will confirm or or prove this fals.
    It won't go on the RR until next month.
    Ps I still have the cat box on with no guts in it. I have no center box.

  6. #6
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    I had a pipe front to back with just tips no boxes at all on my Vectra dti sounded awesome for a diesel there was some piks on a thread last years crispy vreame meet
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  7. #7
    Regular Member tditony's Avatar
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    Vehicle : 2007 sri xpnav

    Trim : sri xpnav

    Engine : 1.9 150

    Year : 2007

    Default

    i have a quad set up on my 2.2 dti and knocked the cat out sounds awesome and goes like stink do it bud

  8. #8
    Regular Member Innes's Avatar
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    Default

    I might be being a bit of a sado but i'm not to fussed about making it louder. I like the look of the duel pipes and the de-cat interests me because of the MPG increase. The rumble of the duel exhaust is just a added bonus.

  9. #9
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

    Engine : Petrol

    Year : 2003

    Default

    The primary function of a vehicle's exhaust system is to muffle the sound coming out from cylinder head and to direct the exhaust gas out the back of the vehicle. The objective of a properly-engineered turbo exhaust system is to provide additional performance while still delivering adequate sound control. Unlike an all-motor exhaust system, a turbo exhaust system suffers no ill effects from going as big as possible. Essentially on a turbocharged vehicle, the turbine section acts as a very effective muffler.

    The larger diameter or de-restricted exhaust pipes allow the back pressure to be significantly less than the factory exhausts system. As a result, the difference in exhaust pressure before and after the turbocharger is increased. The increase in the magnitude of the pressure difference allows the turbocharger to reach higher shaft speeds at lower engine operating rpms. As a result, boost response increases and boost pressures increase. More boost pressure at the intake manifold results more power at the wheels.

  10. #10
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    "The objective of a properly-engineered turbo exhaust system is to provide additional performance while still delivering adequate sound control."


    You got that off a petrol engine forum (Miata Turbo) where they have first of all ensured that the exhaust actually comes out of the cylinder head in a "properly-engineered" fashion. LOL

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