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  1. #1

    Car exhaust burbles at cruse ROE 710 cam

    I this a normal function caused by the waisted spark and/or the valve timing overlap. It is only at light throttle cruse configuration. I have no decel popping and the plugs look perfect. short and long term fuel trims are within the 10% window.

    Under any acceleration it clears up. most of the time it is at 1500-2500 RPM when you here it.

    Parts in the motor
    710 cam
    Slow bleed lifters
    Beehive springs
    HD pushrods
    Gen 4 head gasket
    Stock valve size but bowl ported (.013 off the heads to make then flat and remove imperfection)CR should be 9.8-9.9
    ROE throttle body
    K&N intake with Unifilters
    Mopar racing 3 inch exhaust (no cats)
    170 Deg T-sat
    93 Roe tune for the above items

    I have not been to the dyno yet, and I can't locate my wideband O2. I may just pick up a new one.

    Thanks for any input!

  2. #2
    ...as in a miss-fire? Have a video?

  3. #3
    It's not a misfire, My ZX-10r has the same thing. It is only under light load, cruse. I just have never felt it in a car. If you start to accelerate any, it clears up.

  4. #4
    Moderator
    plumcrazy's Avatar
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    It's all in the tune
    THE IGNORE FEATURE WORKS, TRY IT...

  5. #5
    Enthusiast Hrysler's Avatar
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    Quote Originally Posted by plumcrazy View Post
    It's all in the tune
    I would call Roe. I know A+C performance does remote tunes. If they can't figure it out. Hopefully Roe can help you.

  6. #6
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    A&C > roe at tuning
    THE IGNORE FEATURE WORKS, TRY IT...

  7. #7
    VOA Member
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    Dan Cragin's Avatar
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    That's a fairly big cam that does not work too well at low rpm. Because of the overlap, you will get some surging/burbling at low rpm.

    Maybe you could give some more information about exactly what its doing.

    Good luck.
    specialtyperformanceteam.com
    310-597-6295

  8. #8
    Quote Originally Posted by Dan Cragin View Post
    That's a fairly big cam that does not work too well at low rpm. Because of the overlap, you will get some surging/burbling at low rpm.

    Maybe you could give some more information about exactly what its doing.

    Good luck.
    The car runs perfect as long as you accelerate (even under the lightest throttle) MAP shows less that 2, never any surge or burbling. As soon MAP is over 5-6 Hg (60-65 MPH at 1700-1900 RPM) you get the burb! No surging ever! I have seen the same in my ZX-10 motorcycle after a free flow cat-less exhaust and a preformance tune.

    I figured it was just the high Hg along with the valve overlap pulling hot gas back inside the intake. All the fuel trim data looks good I do not have a WB connected up yet.

  9. #9
    VOA Member
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    Dan Cragin's Avatar
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    If your fuel trims are good then burble is most likely not tune related. I think that cam runs around 240 degree's of exhaust duration, so most likely its just a combination of the cam and catless exhaust.
    specialtyperformanceteam.com
    310-597-6295


 

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