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Thread: Looking for ideas to make the car quieter

  1. #1
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    Default Looking for ideas to make the car quieter

    89 CRX ITA car

    I have the standard DC header with a cherry bomb muffler that ends in the center of the car
    Has anyone tried anything else that knocked the sound down without the loss of power?



    David

  2. #2
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    Talk to tGA. I think he runs a back to back resonators and is around upper 80 db.
    Demetrius Mossaidis aka 'Mickey' #12 ITA NESCCA
    '92 Honda Civic Si
    STFU and "Then write a letter. www.crbscca.com"
    2013 ITA NARRC Champion and I have not raced since.

  3. #3
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    Quote Originally Posted by mossaidis View Post
    Talk to tGA. I think he runs a back to back resonators and is around upper 80 db.
    I'm running a pair of these Walker Bullet Mufflers in series with a center dump in front of the tank, and I'm usually low- to mid-90s at NHMS. Dyno numbers are "very good".
    Not my circus...not my monkeys...

  4. #4
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    Default

    How much power is lost? How about lost top RPM?
    Thanks, MM
    Mike Ogren , FWDracingguide.com, 352.4288.983 ,http://www.ogren-engineering.com/

  5. #5
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    Quote Originally Posted by Flyinglizard View Post
    How much power is lost? How about lost top RPM?
    Versus what? I've never tested it any other way. No desire to get into any kind of significant development expenses, just wanna race.

    But when you do, please pass along the results!

    - Greg

    P.S., and no, I'm not spending money at Burns' Stainless; eBay China copies work good enough for me!
    Not my circus...not my monkeys...

  6. #6
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    The only info I had was from David Vizard's book "how to build HP vol. 1"

    He goes into how to test and which brand names had the best results

    Walker dynomax, Cyclone sonic, Thrush turbo (all V8 testing)

    Stuff like that

    Also hot rodding 101 was never use a cherry bomb muffler they are laud and they kill power

    David
    Last edited by Davegt74; 05-14-2013 at 12:40 AM.

  7. #7
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    Default

    What about earplugs?
    Art Jaso
    Former 1989 Toyota MR2 #55 ITB
    DC Region SCCA
    DC Region Board of Directors
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    PDX/TT Committee Member
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    http://vimeo.com/67177646

  8. #8
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    I like Hushpower by flowmaster. they shut the noise down enough and don't pull the dyno numbers down, at least on our MR2s. not the cheapest option out there, but they work. and they fit in absurdly tight spots, like the tunnel in a civic or anywhere in an MR2.
    Last edited by Chip42; 05-09-2013 at 01:07 PM.
    TrackSpeed

  9. #9
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    Thanks everyone for the input

    Hushpower by flowmaster

    [ame="http://www.youtube.com/watch?v=Zd4e8htvEfc"]http://www.youtube.com/watch?v=Zd4e8htvEfc[/ame]

    borla xr-1

    [ame="http://www.youtube.com/watch?v=r3pzr-MtZQo"]http://www.youtube.com/watch?v=r3pzr-MtZQo[/ame]


    David

  10. #10
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    Default Mufflers

    We always used two shorter thrush cherry bombs in series much like TgA's setup
    on our ITA CRX Si. Seemed to keep the car quiet enough for Waterford Hills 75DB rule.
    Todd Robbins. [email protected]

  11. #11
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    Oct 2005
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    Don't forget about the weight consideration! I've had a Magnaflow universal muffler under there for several years and it gets the job done, well built and inexpensive. Although a bit loud, 100db, it passes sound restrictions. Besides, Mario likes them.

    Check out the 4" 5" & 6" round.

    http://www.magnaflow.com/02product/universalmuffler.asp
    Art Jaso
    Former 1989 Toyota MR2 #55 ITB
    DC Region SCCA
    DC Region Board of Directors
    Coordinator of Racers Helping Racers Fund
    http://www.racershelpingracers.com/
    PDX/TT Committee Member
    PDX Co-Chief of Grid
    PDX Chief Technical Inspector
    SCCA Pit Marshall
    SCCA Pace Car
    SCCA F & C
    Producer of "Racing Summit Point" Video
    http://vimeo.com/67177646

  12. #12
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    Quote Originally Posted by trobbins View Post
    We always used two shorter thrush cherry bombs in series much like TgA's setup
    on our ITA CRX Si. Seemed to keep the car quiet enough for Waterford Hills 75DB rule.
    Wow a 75DB limit thatís like less then stock

    I ended up buying a Borla XR1

    The plan is to put flanges on and run it in series with the cherry bomb

    I plan on completely redoing the system so this will do for now



    Davegt74

  13. #13
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    All of my data/research shows the cherry bomb/straights to hurt power the most.

    Thrush 16755, (Discount/auto) is quiet and cheap. Runs about 90db with 10.5/1 engines.
    Nothing can touch the megaphone on the dyno or track tho.
    My Son's next research is to look into the rules for Prod and mufflers and see if we can fill in the rear lower valence with a " muffler" consisting of the megaphone into the diffuser.
    Mike Ogren , FWDracingguide.com, 352.4288.983 ,http://www.ogren-engineering.com/

  14. #14
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    I dont run any muffler's..mine just follows the tunnel and dumps down/slight bend to the right before the fuel tank. Given the day usually end up in the mid to high 90's for sound. Granted the tracks I race at all have the standard 102DB readings. Go to a place like Waterford hills and Id be kicked out
    Greg Vandersluis
    #4 1990 Honda Civic Si
    #97 2003 Chevrolet Corvette Z06
    #93 2006 Ford Mustang
    Carbotech/BFGoodrich/Vandersluis Motorsports
    2010 Great Lakes Division ITA Champion
    2012 Great Lakes Division T1 Champion

  15. #15
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    Yup. Waterford Hills is situated right next to a subdivision that has been competing for the same groud for the past 55 years. Our rules read that the cars must meet the 75db sound requirement at the property line and must run a muffler that is readily available to the public. There are ways to get creative to quiet a car down.
    There were some races that I'd have to pedal the car past the sound tower and other days I'd ding sound from across the track. Some cars exhaust might not be the problem, it maybe the whine of the gears or the intake sucking air. Some days the car will make sound if it is clear skies and some overcast "low ceiling" days the car won't pass.
    Todd Robbins. [email protected]

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