View Poll Results: Single or Twin Turbo

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  • Single

    8 50.00%
  • Twin

    8 50.00%
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Thread: Turbo Help

  1. #1
    Junior Member APPRENTICE
    Join Date
    Nov 2007
    Posts
    21

    Turbo Help

    I wanna building a turbo sbc!!!!! Its goin to be a street/strip car! I dont know much about turbos!! Whats better for my set up twins or single! HELP

    Its a 355 SBC

    these internals:

    http://store.summitracing.com/partde...%2D300&FROM=MG

    other than

    Stock Crank

    Stock Rods

    These Heads:

    http://store.summitracing.com/partde...5&autoview=sku


    I dont know what to do for a cam, intake ,& carb.. If you see something i should change let me know.

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Montvale, VA
    Posts
    1,431
    What will your compression ratio be?
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Feb 2006
    Location
    Lenoir City Tennessee
    Posts
    865
    what kind of boost you planning on running? i think id change the rods and pistons if it were me. i dont think stock parts would hold up to long.

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Aug 2005
    Location
    Tell City, IN
    Posts
    356
    I think the twin turbo would make too much power for a stock crank and rods...I have seen a single turbo setup run 5.66 in the 1/8th with a stock 400sbc block (aftermarket internals) didn't make too many passes and split the block in half. You could play with a single turbo for awhile if RPM's were kept down.. Just my opinion. Turbo's are the way to go as far as HP but the cost is outragous.

  5. #5
    Junior Member APPRENTICE
    Join Date
    Nov 2007
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    21
    I know alot of import guys and they are all switching from twins to one BIG single! Whats better for the track? 9 to 1 and boosting @ 5 to 8 psi!

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Montvale, VA
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    1,431
    I know very little about turbos,but have read alot about them concerning diesel trucks.Far as I can tell,the idea with them is a 2 stage turbo.One smaller one to help spool up quicker and then a larger one to carry it out with the upper rpms,when you need more airflow.I wouls think that a twin turbo would probably be better.2 small ones that spool up quick,bit together can move some serious air.Of course two cocts more than one.A guy at my track has a 302 fox body Mustang and he adapted a Ford 7.3L Powerstroke turbo to his.HE LITERALLY USES A COFFEE CAN FOR THE AIR BONNET :shock: .I looks crude buy he runs low 6s.And that truck turbo really screams.It is awesome.For the track,with a loose converter,I'd say one biggun.For the street,I'd say stay small.Just my $.02
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  7. #7
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658

    Re: Turbo Help

    Quote Originally Posted by Grimace
    I wanna building a turbo sbc!!!!! Its goin to be a street/strip car! I dont know much about turbos!! Whats better for my set up twins or single! HELP

    Its a 355 SBC

    these internals:

    http://store.summitracing.com/partde...%2D300&FROM=MG

    other than

    Stock Crank

    Stock Rods

    These Heads:

    http://store.summitracing.com/partde...5&autoview=sku


    I dont know what to do for a cam, intake ,& carb.. If you see something i should change let me know.
    You just want to build one to say you did it, or do you actually want it to run like it has a turbo?

    If it runs like it has a turbo with those parts, it won't run long.

  8. #8
    Junior Member JOURNEYMAN
    Join Date
    Oct 2004
    Posts
    29
    Twins should build boost quicker.
    A single should maintain the boost better on gear changes.
    I personally like twins because they simplify the plumbing on a V-8.
    Check out ebay for cheap twin turbo kits that will make the kind of boost you're looking for.

  9. #9
    Junior Member APPRENTICE
    Join Date
    Nov 2007
    Posts
    21
    Car Craft had Marty Stromberger's stock-block SBC, twin-turbo 1988 Pontiac Firebird GTA . See "Hard Core, in the November 2007 Car Craft at pp. 76-80. Its went 9.75 at 141 with an ancient, used, 150,000-mile two-bolt/cast crank short-block and crappy 487X heads ." Thats what gave me the idea! Im not lookin to go that fast i just want to run some mid 11s!

  10. #10
    Junior Member APPRENTICE
    Join Date
    Nov 2007
    Posts
    21
    Thanks for all the comments! What will be good size turbos to go with? Like i said its just goin to be a street/trip car low to mid 11s would be ideal!


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