The exhaust tract and the fuel consumption
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  • 2 Post By sandalet
Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, The exhaust tract and the fuel consumption in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Maybe my question may seem silly, but after replacing the exhaust system in my Cadillac increased fuel consumption. What is ...
  1. #1
    sandalet's Avatar
    sandalet is offline Cadillac Owners Enthusiast
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    The exhaust tract and the fuel consumption

    Maybe my question may seem silly, but after replacing the exhaust system in my Cadillac increased fuel consumption. What is the reason in your opinion? I had a single muffler, I installed a full dual exhaust from the Cadillac SRX 4.6 Average fuel consumption increased by 3 liters per 100 km in mixed mode. Codes for errors are absent, the car became much faster.

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    Kingoftypos is online now Cadillac Owners Master
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    Quote Originally Posted by sandalet
    Maybe my question may seem silly, but after replacing the exhaust system in my Cadillac increased fuel consumption. What is the reason in your opinion? I had a single muffler, I installed a full dual exhaust from the Cadillac SRX 4.6 Average fuel consumption increased by 3 liters per 100 km in mixed mode. Codes for errors are absent, the car became much faster.
    You answered your own question in your question.


    The car is much faster, why? Because you like the sound of it, there for your on the pedal heavier to hear it. Therefore your mileage goes down.

    KOT

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    sandalet's Avatar
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    Re: The exhaust tract and the fuel consumption

    I'm not looking for a loud sound. Exhaust sound from my Cadillac disappeared, no sound, even at 4000 rpm. I pursued aesthetic purposes.

  5. #4
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: The exhaust tract and the fuel consumption

    Bigger diameter pipe means more gas volume so your pumping out more gas quicker than your single pipe and now having to fill 2 pipes which means you have to burn far more fuel.

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    sandalet's Avatar
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    Re: The exhaust tract and the fuel consumption

    I'm sorry, but if I delete all the exhaust system, fuel consumption will be like a space shuttle?
    Kad4Life and Kad4Life like this.

  7. #6
    A48WillyzGuy's Avatar
    A48WillyzGuy is offline Cadillac Owners Fanatic
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    Maybe the O2 sensors aren't calibrated for the increase in diameter? It could be reading the increased volume of air in the tubes as a lean condition and richening the fuel mixture to compensate. I would think they could compensate for it, but I really don't understand how an O2 actually works. It's a long shot, but maybe the O2's from 3.6 CTS will swap in and cure the problem?

    The only other thing I can think of that would cause this is your right foot enjoying the increased power. Lol

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    Kingoftypos is online now Cadillac Owners Master
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    I had a single exhaust. Now I have a dual exhaust, it's a stock 3.6 from just behind the second set of O2 sensors on back to the tips.

    I don't recall seeing a difference in mpg being in the negative. Getting the same or better is what I remember. It wasn't much of a change, so I'll say there was no change.

    The difference between the single exhaust and dual exhaust is from the back of the resonator. With the single, there's a single pipe. Dual, well there's two pipes, and of course another muffler. So the O2 sensors weren't even touched for my install.

    Check out my thread, I'll post it later unless one of you can find it and post via my profile.

    KOT

  9. #8
    Teedoe's Avatar
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    Well guys since we're speaking on exhaust systems, how much of a difference do you think I will notice if I installed a Borla cat back exhaust system rather than a CTS-v cat back exhaust system on my 03 base CTS?

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    Re: The exhaust tract and the fuel consumption

    Installed the CTS-V cat back exhaust system yesterday. I am very pleased with the sound and performance. Now to add a cold air intake. Highly considering Volant.

  11. #10
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    Re: The exhaust tract and the fuel consumption

    teedoe I have the CTSV from the cats back also, with the Volant, and youll love the noises they both make together...its wonderful music. I am considering adding magnaflow mufflers.

  12. #11
    san2cci's Avatar
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    Re: The exhaust tract and the fuel consumption

    Hey teedoe; do you get any check engine lights because of the exhaust? I keep getting P2096

  13. #12
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    I haven't gotten a check engine light because of the exhaust. All is well so far. Ima add the Volant ASAP and maybe Borla mufflers soon.

  14. #13
    RCVW's Avatar
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    Quote Originally Posted by Teedoe
    I haven't gotten a check engine light because of the exhaust. All is well so far. Ima add the Volant ASAP and maybe Borla mufflers soon.
    I have Borla ATAK from a Mustang and love em....Volant and RX Black Ice. The growl is awesome.

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    Teedoe's Avatar
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    RX black ice?

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    Re: The exhaust tract and the fuel consumption

    Quote Originally Posted by Teedoe View Post
    RX black ice?
    Caddy Mojo, mixed with Voodoo.
    Try it you'll like it.

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