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Low end torque capability of 7.3 idi vs p7100 cummins 5.9

Discussion in 'General, Performance, Upgrades & Accessories' started by Daniel McCurdy, Sep 26, 2020.

  1. Daniel McCurdy

    Daniel McCurdy Registered User

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    So witch engine has more capability of making the most torque below 1800rpm the 7.3idi or the 12v cummins. what if the 7.3 had a p7100 would it make the low end more capable.
     
  2. Clb

    Clb Another old truck Supporting Member

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    Oye-vey
     
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  3. Daniel McCurdy

    Daniel McCurdy Registered User

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    What is it a crazy question? I figured that the 7.3 has a very large displacement advantage witch helps low rpm torque but the cummins is a straight 6 witch naturally makes better torque. I'm not talking about stock engines. The 7.3 would have something like a rd4 150 pump and matching turbo
     
  4. Philip1

    Philip1 Supporting Member Supporting Member

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    I cant say much for modified, however stock the turbo 7.3 idi makes 388ft-lbs @ 1400rpm. The 12v cummins makes 400-440ft-lbs @ 1600 rpm (depending on year)
     
  5. 79jasper

    79jasper Chickenhawk

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    Iirc, lower rpm + more power = high cylinder pressure. The cummins will handle that better.
    For either engine, a vgt style turbo will help. Dps turbonator would be my choice.

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  6. 03wr250f

    03wr250f Full Access Member

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    If your planning on a rd150 the motor will not like low rpm lugging
    That pump is more geared toward high airflow from a turbo and stage 1 camshaft and that camshaft doesnt like to be below 1800. It is oriented much more towards high rpm
    For low rpm it's going to be likely no bigger than a 90cc pump and a typ4 torque cam


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  7. oregon96psd

    oregon96psd Full Access Member

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    Like for like, the only way to make the idi pull down low like a 5.9 would be to bolt the 5.9 to the front of it. :rotflmao
     
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