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Thread: Twin Turbo hemi

  1. #1
    Mitsu booster
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    Jan 2021
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    Sheppey Kent
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    Twin Turbo hemi

    Hi Turbo Moparians.

    Happy new year from Limey John here in the UK.
    Many thanx to Frank for allowing me to post on this cold January day.

    I have driven my 'turbo van' for many years and marvelled at the power it has for a 2.0 litre engine.
    It can out run my friends 512ci 1965 Mopar around the country lanes of Kent with ease lol...

    So on to the new project, a twin turbo 528ci hemi with a four speed box.
    I am an avid drag racer and have run normally aspirated gassers for many years.
    But now want to run a twin turbo set up on my hemi road car.

    What do I need to look out for?
    Is an cheap over the counter T45 (x 2) universal turbo unit 'up to the job'???
    Will one intercooler be enough for 528 cubes of Mopower...

    Any tips and advice will be gratefully received!

    Best wishes for 2021 from the Limey
    Last edited by GtxJon; 01-11-2021 at 05:59 AM.

  2. #2
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Dec 2005
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    Sherwood Park Alberta, Canada
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    Re: Twin Turbo hemi

    Welcome!!

    Not exactly the best place for V8 Turbo info as were mostly 2.2/2.5 here.

    Someone much smarter than me will probably have some suggestions.

    Kind regards to 'Er Indoors

    Thanks
    Randy


    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
    83 Turbo Rampage : SOLD
    Edmonton,Alberta,Canada

  3. #3
    Mitsu booster
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    Re: Twin Turbo hemi

    Many thanx for the reply Randy!

    Its more turbo management I was concerned with?

    Most turbo cars I hear in the UK have 'waste-gate' hissing fits, whenever they go past me in my old Mopar!
    I assume they are venting excess manifold pressure from revving in low gears...

    Then there is Intercooler issues and folks say 'BIG is BEST'!
    A lot of turbo's I see for sale need complex electronics to control spark timing and manifold pressure at certain RPM's.

    Its a bit embarrassing when I go to 'open events' at Santa Pod raceway and the tiny 2 litre cars are running low tens with a dustbin sized turbo...

    Now I have seen you post I will stop calling Engines, MOTORS lol...

  4. #4
    Supporting Member Turbo Mopar Contributor GLHS60's Avatar
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    Re: Twin Turbo hemi

    Wastegates bypass some exhaust from the turbo to prevent Turbo overspeed.

    You usually don't hear them but if you did it would be an exhaust noise.

    What you're probably hearing is the blow off valve hissing.( BOV)

    They vent boost to the atmosphere when the throttle is closed.

    Youngsters like to impress by standers with their sound antics.

    Many think they protect the Turbo, that's a separate discussion.

    Rarely will you ever see a BOV on an actual race car.

    Chrysler didn't put them on their factory T-II's.

    They're used for for noise control.

    Ornoise enhancement if so desired!!

    Big as possible with intercoolers is generally accepted.

    Detonation and pre-ignition are the enemy and heat encourages both.

    Anything cooling the combustion chamber is desirable to prevent Engine damage.

    Our Electronics are excellent for our 4 cyls but not easily adaptable for a V8

    Something aftermarket is no doubt the ticket and essential.

    Large domestic production V8 Engines are only supercharged at the present.

    I don't think the Engine architecture is strong enough for Turbocharging, with warranty.

    122 CID 4 cyls make 500 HP easily, a 528 could make more power that it can safely handle.

    The A/F ratio must be spot on once the boost comes on or detonation busts things instantly.

    We monitor it religiously as most have broken pistons with the first hint of detonation.

    No doubt you have quality forged pistons as no others can absorb any detonation.

    Compression ratio is an important consideration in relation to boost.

    Lower compression allows for more boost and boost makes power.

    Turbo matching is important, smaller generally gives better low end.

    Large generally better top end, we often go oversize as we're traction limited.

    A 528 Hemi Turbo is going to be a handful and require a very strong driveline!!

    And very stout Engine block and internals with very precise tuning.

    Good luck!!

    Thanks
    Randy

    My good friend Mario RIP.

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    There is no logical reason to call an Engine a motor.

    Randy Hicks
    86 GLHS60
    86 GLHS 373 : SOLD, but never forgotten
    89 Turbo Minivan
    83 Turbo Rampage : SOLD
    Edmonton,Alberta,Canada

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