Popping coming from exhaust. Downshifting
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This is a discussion on Popping coming from exhaust. Downshifting within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hi I've noticed sometimes (not always) I get a popping sound from the exhaust when Im downshifting from 2 to ...

  1. #1
    Registered User DorBink's Avatar
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    Popping coming from exhaust. Downshifting

    Hi
    I've noticed sometimes (not always) I get a popping sound from the exhaust when Im downshifting from 2 to 3 usually coming off the freeway. Just wondering if I should worry about this? Or does anyone know what this would be?
    Mods: turbo back exhaust, cat less up pipe and I have had it pro tuned.
    I never noticed this until I did the last mod for the up pipe and pro tune but I never noticed this immediately. Like 3 - 4 months later

    Thoughts?

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  3. #2
    Registered User nsibanez's Avatar
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    How do you downshift from 2nd to 3rd?

    Depending on what type of popping, more then likely normal. A lot of aftermarket exhaust sytems do this...don;t know why, would love to if someone wants to fill that part in

    But worse case scenario it's misfiring. But you would throw a CEL if it's misfiring

  4. #3
    Registered User shadowpr's Avatar
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    is it a little backfire?

  5. #4
    Registered User nsibanez's Avatar
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    Quote Originally Posted by shadowpr View Post
    is it a little backfire?
    Sounds like it would be. Especially if there's no CEL codes.

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    ClubWRX.net Vendor adam@kronosperformance's Avatar
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    Catless downpipe?
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  7. #6
    Registered User Terminal Kuz's Avatar
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    You are probably running rich. Mine does the same thing but it depends on the mods you have and the tune.
    2005 WRX (Silver) SoCal Subie
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  8. #7
    Registered User nsibanez's Avatar
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    Beats running lean

    Just out of curiosity, how does running rich cause it to pop?
    I can see, kind of, without a tune due to the extra air flow causing the ECU to need more fuel, and eventually it gets a memory for this

  9. #8
    ClubWRX.net Vendor adam@kronosperformance's Avatar
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    Quote Originally Posted by nsibanez View Post
    Beats running lean

    Just out of curiosity, how does running rich cause it to pop?
    I can see, kind of, without a tune due to the extra air flow causing the ECU to need more fuel, and eventually it gets a memory for this
    Excess fuel will carry along in the exhaust. Exhaust travels through the exhaust piping and fuel of course is flamable, so with a hot exhaust and fuel touching the piping, it will burn or pop.
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  10. #9
    Registered User nsibanez's Avatar
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    That's pretty cool. Personally, I like the sound =p

  11. #10
    Registered User Front Kick's Avatar
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    I'm catless and getting backfiring all the time. AP Stage 2 as well.
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  12. #11
    Registered User DorBink's Avatar
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    Hi
    No CELs. No misfire Yes cat less up and down pipes.
    The tuner did state and I have the graph that he tuned it more rich bc he said it was running lean. I was figuring it was un spent fuel making it out into the exhaust. Typically happens in high revs from 3 to 2. Saying that I think it's odd that maybe I should change my spark plugs since they are about a year old. I figure that should improve ignition?
    But overall based on the comments this doesn't sound like an issue

    Thanks for all of the comments

  13. #12
    Registered User nsibanez's Avatar
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    It really shouldn't be an issue. Wouldn't see why....lower gas mileage at the worst maybe?

  14. #13
    Registered User Terminal Kuz's Avatar
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    Took a look at your profile to see if you listed your mods. Definetly because of what you are running i have pretty much the same mods on my Rex also stage 2.
    2005 WRX (Silver) SoCal Subie
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  15. #14
    Registered User 11blackwrx's Avatar
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    yeah this is probably nothing more than backfire and not a major issue
    2011 Subaru WRX Premium
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