What does a nero 348SS sound like with an x-pipe exhaust? | Page 2 | FerrariChat
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What does a nero 348SS sound like with an x-pipe exhaust?

Discussion in '348/355' started by gothspeed, Apr 26, 2008.

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  1. copterjon

    copterjon Formula 3
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    #26 copterjon, Apr 30, 2008
    So let me get this right, I can't use my Hyperflow cats with this muffler? I need to buy a whole system all over again? When will these be available and how much of savings will there be? This sounds like a killer set up for someone without any exhaust mods but for us guys that already blew the wad on hyperflows and Tubi or whatever muffler I'm not sure this makes sense for a little more noise and a puff of performance. Hmmm, maybe someone will liberate my system and I'll pick up one of these.
     
  2. gothspeed

    gothspeed F1 World Champ

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    #27 gothspeed, Apr 30, 2008
    You will be able to use your hypers.......... ;) . Just say you need a hyper/stock cat 'compatible' system........ :)!

    Since Vince had stock cats he wanted them replaced w/hi-flow metallics. So we made the whole system 2.25" tubing throughout, on his 'new' cats and exhaust.

    The stock cats and hypers use the slightly smaller 2.125" exit tubing size.
     
  3. copterjon

    copterjon Formula 3
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    #28 copterjon, Apr 30, 2008
    Awesome, Thanks Goth. I want one!!
     
  4. gothspeed

    gothspeed F1 World Champ

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    #29 gothspeed, May 1, 2008
    Here is a video of idle and some revs........ :D

    General note: the air injection valves are open (start up sequence) and givin it some extra noise at idle, that will go away after a full warm up. Make sure you turn up those speakers.. :) ........and don't mind the peacocks squawking in the background....... ;).

    http://www.youtube.com/watch?v=CM9KBDFoC9g

    The tunnel runs and dead stop accelerations to come..... :)
     
  5. ernie

    ernie Two Time F1 World Champ
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    #30 ernie, May 1, 2008
    Sweet!!!!

    I can hardly wait until I get my set up.
     
  6. No Doubt

    No Doubt Seven Time F1 World Champ

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    #31 No Doubt, May 2, 2008


    Yeah, Baby! Yeah!
     
  7. FandLcars

    FandLcars F1 Rookie

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    #32 FandLcars, May 6, 2008
    Goth & Guys - I guess you've seen today's posts by Nick of Nick's Forza Ferrari re: the stock 355 Y pipe. Kind of sounds like another 355 guide issue controversy, but maybe not. I'm interested in following discussions on the topic.

    Without having looked at 355 exhaust in detail, isn't the X-Exhaust in many ways the same as the stock Y pipe? I know there's a bypass valve, but it's still 2 into 1 into 2, right? Any thoughts at this point on the topic? Thanks.
     
  8. PAP 348

    PAP 348 Ten Time F1 World Champ
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    #33 PAP 348, May 6, 2008
    Sounds marvellous mate!! :):)

    It also looks very cool!! :D:D
     
  9. hank sound

    hank sound F1 Veteran

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    #34 hank sound, May 6, 2008
    That bloody thing has a "howl" that I've not heard before. Great results, I'd say :) :) :)

    Cheers, Hank
     
  10. FandLcars

    FandLcars F1 Rookie

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    #35 FandLcars, May 6, 2008
    But Nick is saying the stock Y pipe exhaust on '96 and newer 355's is the root cause of ALL of the 355 header and cat problems. If I'm understanding his threads correctly, I believe he's even of the opinion that valve guide problems may also be related to the Y exhaust. That may be a stretch, but makes me wonder if caution may be in order on the X-exhaust.
     
  11. speedy_sam

    speedy_sam F1 Veteran

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    #36 speedy_sam, May 6, 2008
    +100000000000000000000000000000000000000000000000000
     
  12. gothspeed

    gothspeed F1 World Champ

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    #37 gothspeed, May 6, 2008
    It may seem similar but looking at the whole picture it is thoroughly different....... here are some points of comparison to the 355 vs 348 engines/exhaust:

    (This is only from exhaust perspective only .... intakes ITBs vs TBs vs more fuel.....etc.... will not be factored in to simplify this post)



    348 is 7500rpm and 300HP..................... 355 is 8500rpm and 375HP.......... first problem is they both use the same size header 'collector' tubing size of 2.125" O.D. or 2.0" I.D. :eek:..( cross-sectional flow area of 3.14")......... it does not take much to understand the collector on the 355 has to flow over 25% more air through the same orifice size as the 348................ can you say 'increased backpressure'????? This restriction causes 'increased heat' in the 355's primaries and heat causes tubing failure... :( ......... IMO one of ferraris way of trying to increase the flow for the new 355 motor was making the 'bypass' exhaust. But sadly they did not change the collector size from the 348 headers to the new 355 headers .... :( ....

    Now compare the 360s same rpm as the 355s @8500 and only 25hp more....... they used a header collector that is 26% larger for a HP increase of only 6%.....:eek:!!!

    Quick Summary: 355 goes 25% more HP and gets the "same" collector as the 348
    360 goes 6% more HP and gets a 26% larger collector :eek:....... (360 headers rarely fail ;) )

    (note: I used tubing 'inside diameters' for the above calculations)

    Briefly....... the x-pipe exhaust on the nero 348 in the video has dual 2.25" OD tubes all the way through to atmosphere ......... so now the smallest 'cross-sectional' flow area is the two 348 collectors w/2.125" OD tubes. The merge point (x-pipe) is not..... 2 - 1 - 2 ...... it is more like..... 2 - 1.9 -2 and that '1.9' is still larger than the two 348/355 collectors combined!!..........and IMO the factory collectors are well suited to the 348 engine size, RPM and HP rating.... :)....... but not for the 355 :(.

    .....thanks mate..... :)!!!

    indeed it does..... :D!!!

    There are numerous I on which causes the 355 header failure and IMO almost as many actual 'causes'......... here is a quick one of mine that I believe is a contributer.........

    If one lets the cars sit....... I believe it is possible that the injectors would get gummy/clogged ............. injectors in this condition will not atomise fuel effectively ............. improperly atomised fuel will not burn 'fully' in the combustion chamber........... which is essentially running the affected cylinders lean........... lean = heat ................ then at the same time .......... the unburnt fuel is going into the exhaust.......... fuel in the exhaust (which finally gets to burn) will create even more heat in the exhaust....... all of which will cause the exhaust to be waaay too hot...... :(


    BTW........... I have also heard of 355 header failure with even a wide open 'challenge' type exhaust........... so it is my opinion that collectors are too small as well as the possibility of unburnt fuel going into the exhaust (as I have explained above). I have seen a blown bad header with black soot in the bad tubes and the other side had light tan/grey color which is good IMO.
     
  13. ernie

    ernie Two Time F1 World Champ
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    #38 ernie, May 6, 2008
    Last edited by a moderator: Sep 7, 2017
    It's a stretch in my opinion. The 355 insides are nothing like a true x-pipe exhaust. Here is a picture of the guts of a 355 muffler. You can see how the y-pipe just dumps into the top of the muffler.
    Image Unavailable, Please Login
     
  14. FandLcars

    FandLcars F1 Rookie

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    #39 FandLcars, May 7, 2008
    Thanks guys, since I hadn't tried to look at the actual 355 exhaust setup/design, I was just curious and a little concerned, after seeing Nick's posts. Appreciate the feedback and explanations.
     
  15. Ingenere

    Ingenere F1 Veteran
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    #40 Ingenere, May 7, 2008
    Oh John, you like it when she slaps you around a little! :)

    I have a Tubi and test pipes, and have to say that the 348 is one of the best sounding engines the boys from Maranello have made. Period!
     
  16. vvassallo

    vvassallo F1 Veteran

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    #41 vvassallo, May 7, 2008
    Small correction: The stock dual-can 348 is rated at 7200 rpm and 300 Hp. The single can Spiders and SS cars are at 7500 and 312 in US form. But you get the point... :)

    FYI, I'm estimating mine at 327 gross with the gothXpipe, intake mods and ND pink chip. :)
     
  17. gothspeed

    gothspeed F1 World Champ

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    #42 gothspeed, May 7, 2008
    +1 .......... true I forgot about the different redlines ... :eek:
     
  18. DLuxxx

    DLuxxx Karting

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    #43 DLuxxx, Jul 14, 2008
    bump... anything new about this? i just saw the video and am amazed at the sound. i am planning to pick up an exhaust sometime soon and i am trying to collect all the info i need.
     
  19. gothspeed

    gothspeed F1 World Champ

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    #44 gothspeed, Jul 14, 2008
    A couple of these are in the works for some fellow 348 owners. When they get installed....... there will be more pics, videos and dyno numbers ..........:cool:
     
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