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  1. #1
    Mothman's Avatar
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    2.75 inch intercooler pipe

    Decided to swap the 2.5inch intercooler piping to 2.75inch.
    Ran it today in 97F air.
    IAT's were constant 86-87F. (Garrett 1000hp core keeps IAT's rock solid a few degrees over water temp)
    Didn't see any gains...
    Has anyone else changed piping diameter?
    Next year I'm building it up to turn 9200, and thought this may benefit a higher rpm build.


  2. #2
    Autism Speaks. Its Time To Listen gOt BoOsT's Avatar
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    imo the larger diameter piping would slow you down, unless you were moving serious air. it takes longer to fill the pipe with compressed air resulting in slower throttle response.
    how much boost you running and where are you taking you iat's from?

  3. #3
    Mothman's Avatar
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    Almost 16. First temp sensor is on hot side of intercooler, the other is on the stock ic block off plate on the manifold.
    It did seem not to 'hit' as hard midrange, but it pulled hard-more linear than normal. The 61mm throttle body makes it come on very strong in the middle as boost builds up. Imagine a a poorly ported two stroke, on/off type power. Today it felt more 'normal', if that makes sense.
    Sure glad I didn't lose anything.
    It's a pita switching pipes with that big damn intercooler wedged in there... I may switch back for comparison. hmmm

  4. #4
    imp0ster's Avatar
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    I take my temps from the same place and 2.5 is fine. It's the size of the SC and TB. My Iats are 91-92 in 82-83 degree water and 97-100 degree air. CXR eBay IC But it's massive compared to garret cores so there is a trade off

  5. #5
    Mothman's Avatar
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    This ic is overkill for now, buuuut I'm working toward a future filled with monstrous boost and cheek-flapping, butt-puckering speeds! lol
    If switching back to 2.5inch pipes doesn't hurt/help, I'll keep the 2.75in on the shelf and test next year.
    If it doesn't blow up this summer, she's going in for some serious port work next year. Slow91 seems to know his way around this head.

  6. #6
    I'm not a mechanical engineer or anything, but I do know that an engine is all about "velocity". Larger diameters = slower air movement. Get it in as equally as you can get it out. Like a math equation - what you do to one side, you do to the other. Too much of a good thing is too much.

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