gothspeed's new 355 monster flow exhaust is completed!!! by-pass valve is history!!!! | Page 3 | FerrariChat

gothspeed's new 355 monster flow exhaust is completed!!! by-pass valve is history!!!!

Discussion in '348/355' started by gothspeed, Apr 21, 2009.

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  1. hezgon

    hezgon Formula Junior

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    Stan
    #51 hezgon, Apr 22, 2009
    Magnificent
     
  2. 355

    355 F1 Rookie
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    #52 355, Apr 22, 2009
    That sound exactly like my system. OEM headers with straight pipes and the bypass valve iliminated with installation of the Challenge pipe.
    Your car sounds awsome Goth. Over the years I have been tolled by many that there is no 355 they have heard that sounds like that.
     
  3. J. Salmon

    J. Salmon F1 Rookie
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    #53 J. Salmon, Apr 22, 2009
    I am going to have to find a quiet place to be alone and collect my thoughts.
     
  4. Oengus

    Oengus F1 World Champ
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    #54 Oengus, Apr 22, 2009
    Holy ****E!!!!
     
  5. vvassallo

    vvassallo F1 Veteran
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    #55 vvassallo, Apr 22, 2009
    LOL I do remember it sounding better than that in person... ;) The video loses the smooth purr as the throttle increases at lower rpm, transferring to a metallic trumpeting before the banshee wail at full throttle and max revs. Somewhere in there you can hear a piece of sheet metal being torn in half by a lightening bolt. We'll work on a proper representation. I told goth that it reminds more of a sport motorcycle exhaust (think Ducati or something really dangerous), but of course much much more potent.
     
  6. nizam

    nizam Formula 3
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    #56 nizam, Apr 22, 2009
    I'm not local, but I would like to go to a Cars and Coffee in Irvine so make an announcement (or PM me) and I'll make an effort to come down (from NorCal).

    O M G


    That's fantabulous. I've got to see this thing in person.
     
  7. James-NZ

    James-NZ F1 Veteran

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    #57 James-NZ, Apr 22, 2009
    Oz man, I love your car! Great video, makes me want to do a late night run to some tunnels and video the trip. She sounds super hot. Was the a cackle on over run I heard?

    Well done on the video too brother, I would love to make something like that of my car.
     
  8. fatbillybob

    fatbillybob Two Time F1 World Champ
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    #58 fatbillybob, Apr 22, 2009
    I gotta say something is lost in the video. The video is like just seeing a picture of a pretty girl. It is so much more in person. It is just the best sounding 355 I have heard.
     
  9. Loser

    Loser Formula Junior

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    #59 Loser, Apr 23, 2009
    Maybe we should have a NorCal pilgrimage to worship the new God!
     
  10. Night life

    Night life F1 Veteran
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    #60 Night life, Apr 23, 2009
    OMG OMG OMG

    Don't take this the wrong way but I got a chubby listening to that...:eek:.... WOW how intoxicating.....
     
  11. PizzaPrince

    PizzaPrince Karting

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    #61 PizzaPrince, Apr 23, 2009
    Goth.......... truly music to anyone's ears........Bravo brother, you are without a doubt gifted.
     
  12. darrenliu

    darrenliu Formula Junior

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    #62 darrenliu, Apr 23, 2009
    Goth

    is 'gothspeed' short for 'got the speed'?

    Your exhaust system sounds awesome. I have a couple of questions:

    There's no bypass valves at all, not even 360/430 style. This means your system may be a bit noisey when cruising. Any comment?
    Also, did you design the muffler and internal baffling? Does it meet your states noise regs? Probably not!
    What about the cat bypass ecu and thermocouple? How did you deal with this?

    Thanks

    Darren Liu
     
  13. davehelms

    davehelms F1 Rookie

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    #63 davehelms, Apr 23, 2009
    Well done Oz, hats off to you for the effort!
     
  14. VTChris

    VTChris F1 World Champ

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    #64 VTChris, Apr 23, 2009
    Now THAT's what I'm talking about!

    Sounds great!
     
  15. f355jimv

    f355jimv Formula Junior

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    #65 f355jimv, Apr 23, 2009
    Hey Goth.... We can hear you down in Orange County.

    Nice........
     
  16. johnny boy

    johnny boy Rookie

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    #66 johnny boy, Apr 23, 2009
    Try Nouvalari Eng Ltd they do a lightweight Sports exhaust and a Super sports and they sound mind blowing 00 44 115 9386115 or mobile 07784689418
     
  17. bcwawright

    bcwawright F1 Veteran

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    #67 bcwawright, Apr 23, 2009
    Hey buddy...DON'T you have some work to complete???...lol

    MAY 1....its' got to be purring
     
  18. 285ferrari

    285ferrari Two Time F1 World Champ
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    #68 285ferrari, Apr 23, 2009
    OUTSTANDING!!!!!!!!!!
     
  19. zero

    zero Guest

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    #69 zero, Apr 23, 2009
    AH,are we talking about that place in Wattnal in Notts? I know that place, its near me. Anyway we as owners never fall short of offers for exhaust systems.
    Its just that Goth actually owns a F355 so he knows what standards, sounds and quality we expect, thus did this set up with a labour of love;) But thanks anyway.
     
  20. ernie

    ernie Two Time F1 World Champ
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    #70 ernie, Apr 23, 2009
    Last edited: Apr 23, 2009
    Nope not noisy at all.

    Like I said the, after we finished putting it in the first day I followed Ozzy to listen to it. I asked him to get up to speed then put it in 5th. We where just cruising at around 45 mph, it sounded quite mellow. It's the X design in the muffler. The cross pulses balance out the air flow from each bank, and thus the exhaust isn't very loud until he mashes the loud peddle down. Sitting at idling it is louder and deeper than stock, but while driving nothing over bearing.
     
  21. notbostrom

    notbostrom Formula Junior

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    #71 notbostrom, Apr 23, 2009
    goth,

    would you have any photos of the inside of the stock 348 spider muffler?
     
  22. cavlino

    cavlino Formula 3
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    #72 cavlino, Apr 23, 2009
    Bruce the distraction was my fault, sorry about that. I asked Dave to look at this thread since I thought he may have missed it.
     
  23. f355spider

    f355spider F1 World Champ
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    #73 f355spider, Apr 23, 2009
    Last edited: Apr 23, 2009
    Goth,
    looks and sounds awesome!

    1) How do you spoof the 5.2 Motronic to not throw a "check engine" light with the bypass valve removed?

    2) Are these oem 360 manifolds any different than the regular 360 manifolds? I ask because there are starting to be some threads of 360 manifold failures.
     
  24. gothspeed

    gothspeed F1 World Champ

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    #74 gothspeed, Apr 23, 2009
    Last edited: Apr 23, 2009
    Thank you guys for all the good words and encouragement :)!!!! It is really nice to have such a great group to share projects with :D!!! This system was made because as we all know the factory 355 setup could use some improvement to say the least. I used larger tubing to complement the larger 360/CS collector, located the o2 bungs on the larger diameter of the high-flow metallic cats (same position as factory 355) to maintain cross-sectional flow area throughout the exhaust path. The dyno will be next ............ but I can definitely say ......... I notice a considerable 'seat of the pants' acceleration improvement ......... :D!! The throttle response is also hugely improved ............ as soon as the pedal is pressed the power is there!! Now I cannot wait until I get my hi-flow air boxes done ................. :eek:!!!!

    This exhaust is comparable in loudness as the standard capristo level 1 I had on there a while back .......... actually from inside the car at 'normal' revs it seems very similar ......... Vince and I will be getting a lot more video covering a larger spectrum of its sound dynamics at the 'first annual stooge fest and BBQ' this coming saturday ....... :)!!! We will try to get a clip as zero specified too ...... ;)!

    The by-pass thermocouple is not used on the standard capristo either ........... I just rolled it neatly and zip tied it off to the side ......... leaving its respective ECU wire connections untouched .................................. the by-pass thermocouple is there to monitor excessive heat from the upper cats and will throw a CEL in the event the by-pass valve itself is 'stuck open' ............... so absolutely no CEL with the gothspeed monster flow exhaust :) .................... anyone can test or validate this by removing the thermocouple from the by-pass location on their muffler, capping the bung ........ and driving at full chat until convinced ...... :eek:

    Yes I used factory 360/CS manifolds ......... and I have heard examples of 355, 360, 430, 500 exhaust manifolds going bad .......... but since my factory manifolds were holding up just fine with no 'visual' evidence of unusual heat or any physical leaks ............... I have confidence these will last me a while ........... I especially like the factory shielding and the 4-2-1 merge design of these manifolds, which helps keep mid-range power ....... :)!!! If these ever go bad it will be time to either get some fabspeed 360 headers or make myself a set of monster 'stepped' 4-2-1 headers ........ :D ............. but for now we can dyno the difference with just this exhaust change ........... :cool:


    ..
     
  25. zero

    zero Guest

    Apr 24, 2007
    776
    #75 zero, Apr 23, 2009
    Sorry fell asleep while reading all that, will try again in the morning;)
     
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