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My turboed 308 exhaust system

Discussion in '308/328' started by Norpower, Dec 10, 2009.

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  1. Norpower

    Norpower Rookie

    Dec 20, 2005
    25
    Mtl. Canada
    Full Name:
    Dino Giar
    #1 Norpower, Dec 10, 2009
    Last edited by a moderator: Sep 7, 2017
    Just finished up my own exhaust system on my Cavalino. My first system was an ANSA which I purchased many years ago, it looked ok but resonated badly at 3-4k rpm kind of annoying when cruising but sounded nice before and after.Then I replaced it with a Borla S/S system which was nice and that resonance was gone!! It ran for a few years but the HP bug bit me again so I upgraded turbo, motec etc. and found it restrictive past 450hp. So I replaced it with a 3in straight through muffler and single 3.5in tip which wasnt too great in the looks department and way too loud in the lower rpms. Kind of like those hopped up Hondas & Subies. So I decided to fab up my own with 4 tips using 304 ss and a 3in Corsa muffler. This is a real nice piece with a special resonance chamber and smooth high flowing straight through tube. It is rather large compared to my previous 3in muffler, 8x 10x12in. Check out their website. But the sound blew me away, absolutely no resonance, the lower frequencies were well attenuated and all that is left is a smooth high pitched sound better than the 430 imho!!! Finally i'm satisfied!!!
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  2. GrayTA

    GrayTA F1 World Champ
    Owner Rossa Subscribed

    Jun 25, 2006
    15,130
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    PDG
    #2 GrayTA, Dec 10, 2009
    Very cool looking!!!

    What turbo setup are you using? What is your HP rating?


    PDG
     
  3. pad

    pad Formula 3

    Sep 30, 2004
    1,426
    Tequesta, FL
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    Paul Delatush
    #3 pad, Dec 10, 2009
    Looks good. How about a write up on the turbo setup? I'm sure there are people interested in what you have under the hood (myself included).
     
  4. t3thomas

    t3thomas Formula Junior

    May 9, 2008
    427
    North Carolina
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    GThomas
    #4 t3thomas, Dec 11, 2009
    I'd like to hear a sound clip too!! You certainly do nice work, the pipes look sharp!!
     
  5. Indy430

    Indy430 Karting

    Dec 5, 2007
    210
    Indianapolis
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    RJ
    #5 Indy430, Dec 11, 2009
    Looks great! Nice work!!
     
  6. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
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    Mike
    #6 miketuason, Dec 11, 2009
    Can't wait to watch the video sound clip:)
     
  7. shmark

    shmark F1 Rookie

    Oct 31, 2003
    2,968
    Atlanta
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    Mark
    #7 shmark, Dec 11, 2009
    Don't you love it when someone just casually throws off a statement like that? :) Beautiful car and definitely tell us more about the turbo system.
     
  8. hanknum

    hanknum Formula 3

    Nov 1, 2003
    2,050
    Santa Barbara
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    Henry
    #8 hanknum, Dec 11, 2009
    +1
     
  9. Norpower

    Norpower Rookie

    Dec 20, 2005
    25
    Mtl. Canada
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    Dino Giar
    #9 Norpower, Dec 11, 2009
    Last edited by a moderator: Sep 7, 2017
    I am using a Turbonetics T-66 compressor a with .69a/r turbine housing and 3in downpipe. A Spearco air/water intercooler with its own radiator up front.Motec M8 standalone controlling 46 lb/h Bosch injectors, Tial comp wastgate, dual MSD 6A CDI, Magnecore 10mm ign wires and Blaster coils. Over bored throttlebody to 70mm and 3in aluminum cold air intake. JE 10:1 comp pistons which really help the motor pull through before boost gets in at 3K rpm.Solid copper headgaskets and o ringed liners. Heads were fully ported and polished with 2mm os intake, 1mm os exh valves,titanium retainers. Lightweight flywheel and a twin disc carbon/carbon 7 1/4 in Tilton clutch.Both clutch and flywheel weigh 16 lbs. Stock gtsi cams with Nicks beautiful adj. timing gears and upgraded belt system. Bob Norwood fabricated the rear exhaust manifold which bolts up to the turbo, front manifold is stock. I mapped the motor myself on the road (scary!!) Still haven't dynoed the current setup but had it on a dyno 8 years ago just running a Haltech, small 57 series turbo, borla exhaust 32lb injectors which pretty much maxed out at 6200rpm and put out 395rwhp@6000rpm and 360 ft/lbs @4400rpm. It ran real nice but compared to my current setup it now pulls much harder at same 15lbs boost and also past 8K. As far as estimating my hp, I am using 46 lb injectors at 50lb fp which are at near max flow at peak tq (11:1afr) it should support 600hp??? But I will hit the Dynapack in the spring and get some real numbers.
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  10. Hans

    Hans F1 Veteran

    Feb 17, 2006
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    Hilversum, Netherlands
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    Hans Teijgeler
    #10 Hans, Dec 12, 2009
    Sweeeeeet!

    Nice seats too!
     
  11. 246tasman

    246tasman Formula 3

    Jun 21, 2007
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    Will Tomkins
    #11 246tasman, Dec 12, 2009
    I assume you must have increased the combustion chamber volume to drop the CR down from 10:1. Do you know what the actual CR is now?

    The F40 CR for example is 7.8:1.
     
  12. Norpower

    Norpower Rookie

    Dec 20, 2005
    25
    Mtl. Canada
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    Dino Giar
    #12 Norpower, Dec 12, 2009
    My heads have been milled to reduce combustion chamber volume to 38cc.Then factoring in a 0.060 gasket and domed piston my compression was intenionally increased to 10:1. Which I know is contrary to the old school rule of lowering comp in forced ind motors. Low comp turbo motors are real dogs before the boost hit like the 911s but if you retard the timing accordingly you can get away with it and spool the turbo much quicker. Great mpg too! But I am limited to maybe 20lbs boost on 94 octane gas.
     
  13. mk e

    mk e F1 World Champ

    Oct 31, 2003
    13,735
    The twilight zone
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    Help me get this thing finished! https://gofund.me/39def36c
    #13 mk e, Dec 12, 2009
    +1

    I've been thinking I need something similar.....once my engine runs that is :(

    nice job! Must be a blast to drive!
     
  14. TURBOQV

    TURBOQV Formula Junior

    Mar 6, 2003
    838
    NV and Utah
    #14 TURBOQV, Dec 12, 2009
    Way cool. What part number did you use? I would like to do that to my setup.

    Cheers
     
  15. Pizzaman Chris

    Pizzaman Chris F1 Rookie

    Mar 13, 2005
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    New Hampshire
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    #15 Pizzaman Chris, Dec 12, 2009
    Very nice.

    Love the matching color you did on the cam covers and harmonic balancer.
     
  16. Hawaii

    Hawaii Formula Junior

    Jan 28, 2007
    847
    Maui
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    Emery
    #16 Hawaii, Dec 13, 2009
    Just beautiful!!! Please tell us more about the seats and where to get em!
     
  17. 246tasman

    246tasman Formula 3

    Jun 21, 2007
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    Will Tomkins
    #17 246tasman, Dec 13, 2009
    Very interesting. I've never heard of this approach before. Is it now commonplace?

    Does the retarded spark mean there's more unburnt fuel going out the exhaust?
     
  18. 328turbo

    328turbo Formula Junior

    Jun 15, 2009
    306
    nyc
    #18 328turbo, Dec 13, 2009
    hell yeah!!!
    my car is a hi-compression turbo as well!
    works especially well with high revving street motors.
    there is no downside in part throttle situations and the turbo spools up much quicker -no lag.
    Ferrari engine produce next to no torque in the first place, last thing you want to do is drop compression

    low compression turbo motors are awesome in low revving engines that always live very close to its powerband.

    incredible car, Norpower. looks great! :)
     
  19. Norpower

    Norpower Rookie

    Dec 20, 2005
    25
    Mtl. Canada
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    Dino Giar
    #19 Norpower, Dec 13, 2009
    Thanks!! Yes it is a blast, things happen real fast when you get on it. Feels as though the gearing is too short now. If I could only squeeze in a sixth gear !!! Still would like to lighten it up a little more with a CF rear lid with some lexan so I can see the motor. But who can put that together? I bought the seats from some guy with an RX7 racecar and don't know the brand, I just had them partially recovered with yellow Alcantara-like fabric.
     
  20. FJS308

    FJS308 Rookie

    Mar 15, 2009
    15
    Suffolk County, NY
    #20 FJS308, Dec 14, 2009
    Just came upon this thread AWESOME

    the mustang crowd makes use of hi compression motors with forced induction all the time, a great combo with a motec or similar sytem tying it all together.
     
  21. SMS

    SMS F1 Veteran

    Jan 7, 2004
    6,775
    Indy
    Full Name:
    Bill S.
    #21 SMS, Dec 14, 2009
    Neat, neat, neat.

    Great car, thanks for the write-up!
     

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