vdrive twin turbo blowthrough
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vdrive twin turbo blowthrough

  1. #1
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    Default vdrive twin turbo blowthrough

    ok guys setting up a 18 foot flat bottom v drive thinkin about doing a twin turbo setup ive done alot of car/bike building racing with power adders
    but havent done any boat setup looking at 2 different size turbo setups dont kow if one is to small or to big any advise.. engine will be at first mild smallblock chevy intake mild cam slight head work etc..
    then within a year build it up to full out race as in big solid roller cam big heads etc etc prolly use a 750 4150 carb i dont want to get the small turbos then outgrow them and i dont want to get to big a turbo and never be able to use them ...anythought on these two diffent sizes
    ill be using 2 of these...

    heres the two turbos im lookin at
    t3-t4
    .57 compressor
    .72 trim turbine
    .60 a.r compressor
    .63 ar turbinehousing

    or 2 gt45,s
    Inlet: 4 3/16" / Intake (ID/OD): 2.25"/3.25"
    Inducer: 68.7mm / Exducer: 97.8mm
    Trim: 69 / A/R: 0.66
    Turbine:
    Outlet: 4"
    Downpipe flange: 3.5" V-band
    Inducer: 87.4mm / Exducer: 77mm
    Trim: 92 / A/R: 1.05


    anythought on these ..if i need more info let me know..

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    gt45's those others look like ebay turbs

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    gn7
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    If there is one thing I have learned from Impatient, when it comes to turbos, you have to stepp up the big stuff for the big HP.





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    [QUOTE=gn7;1248023]If there is one thing I have learned from Impatient, when it comes to turbos, you have to stepp up the big stuff for the big HP.

    [/QUOTE

    Only you could find that!

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    lol boat would prolly sink if it even had that turbo aboard...
    might as well use it for a turbine and leave the engine out of the equation.....


    so i guess the answer im lookin for is will a small block be able to spool up 2 gt45 turbos ? or would 2 be over kill... i dont have a problem runnin just one but i had everything routed in my head for 2(exhuast.etc )

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    Along that line here's a small block with twin 88 MM turbo's,

    http://www.yellowbullet.com/forum/sh...d.php?t=270050
    41# of boost with only 32# of back pressure.
    Doesn't look like the lag was a problem for them as the front tires were off the ground.


    That's considerably larger than I run on a 540 big block but I'm just a lake boater. Racers are much more serious.
    Last edited by Unchained; 10-04-2010 at 09:40 AM.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

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    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  9. #7
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by jasony View Post
    lol boat would prolly sink if it even had that turbo aboard...
    might as well use it for a turbine and leave the engine out of the equation.....


    so i guess the answer im lookin for is will a small block be able to spool up 2 gt45 turbos ? or would 2 be over kill... i dont have a problem runnin just one but i had everything routed in my head for 2(exhuast.etc )
    id go with jus 1 s475 or s480 if it were mine, i used a hybrid built turb for my lil ls turb engine, 1.1 ar with smallll turbine and bigggg compressor wheel (80mm et-r) from jose at forced inductions. twins are cool and all but your runnin a sbc, and a single will spool faster and easier than twins well unless you jus buy tiny twins, then itll be bout the same.

    buy a set of stainless sbc turbo headers off ebay for 160bucks, build yourself a merge pipe and mount a big single
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    Last edited by IMPATIENT 1; 10-04-2010 at 01:29 PM.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by gn7 View Post
    If there is one thing I have learned from Impatient, when it comes to turbos, you have to stepp up the big stuff for the big HP.

    lol u aint rite gn7 i've gotta big ass turbo from a locomotive i need to go by and pick up, was gna jus get it for a conversational piece, gta buddy who does locomotive work and he got me a compressor wheel off 1 awhile back, sob was hugeeeeee

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    buy a set of stainless sbc turbo headers off ebay for 160bucks, build yourself a merge pipe and mount a big single[/QUOTE]

    yea i was think something along the lines of that

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    Quote Originally Posted by jasony View Post
    buy a set of stainless sbc turbo headers off ebay for 160bucks, build yourself a merge pipe and mount a big single
    yea i was think something along the lines of that[/QUOTE]

    call turbodaves in dallas texas, order up 1 s475 1.32ar turb for 625 delivered, build a nice 383sbc, and get r done it'd make 20lbs easily and be pretty damn responsive, plenty nuff to burn the hell outta a prop leaving

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    how much power/mph u think that setup above would net.. i know depending on tuneup cam heads etc.. lets just use say roughly 450-500hp engine before turbo is added

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by jasony View Post
    how much power/mph u think that setup above would net.. i know depending on tuneup cam heads etc.. lets just use say roughly 450-500hp engine before turbo is added
    at 16lbs otta be making at least 800+ if intake air temps are kept in check, a 383 with the proper sized turb and carb is gna be sik in a vdrive, keep at it and you'll prove alot of vdrivers here wrong about a long standing dispute about wether it'll work or not in a flat.us turb guys say it will and then some, the naysayers are clueless bout blowthru tech and thinks its as laggy as drawthru types. if you chose to go the turb route, we'll be glad to help ya

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    yea i plan on doing it as i want something that i dont have to refill all the time and will be there when i want it..
    it will be a blow thru carb for sure and a small block chevy for sure
    i already have a brand new dynojet wideband2 with lcd display that i never used on one of my turbo bikes so i plan on using that for tuning and datalogging

    twin or single will be the dispute and which turbo/or turbos will be used


    my drawthru bike i had seemed very responsive .. may have just been the application its had a 60 45 area split on it dont rember exact number

    and i also had a blow thru f.i mustang 302 with a 76 mm on it and it just seemed like i could have had a bigger turbo on it .. i had it maxed at 30 lbs..

    ill be glad to take the help as i have a ton more questions and anymore insight will be gladly taken..

    why does some not think it wil work in a flat?

    heres the test bed..lol i have totaly stripped it and am doing body work as wee speek

    Last edited by jasony; 10-04-2010 at 01:14 PM.

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    Quote Originally Posted by IMPATIENT 1 View Post
    yea i was think something along the lines of that
    call turbodaves in dallas texas, order up 1 s475 1.32ar turb for 625 delivered, build a nice 383sbc, and get r done it'd make 20lbs easily and be pretty damn responsive, plenty nuff to burn the hell outta a prop leaving[/QUOTE]

    What about turbos off a buick 3.8,GN would two of them be to much.? Also Chrysler had a 2.2 that was turbo'd.

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