15 Gen 4 Whipple PBD Cal...What will it make?

Discussion in 'Forced Induction - 5.0L V8 Engine' started by Roh92cp, May 27, 2019.

  1. markmurfie

    markmurfie Well-Known Member

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    You would do the test dry, to start with. The psi should be near 15 x cr. If any cylinders come up low, you put a small amount of oil in and check again. If the numbers come up is a ring issue for taking apart the bottom end. If they don't it's a head gasket/valve issue your taking the top end apart.

    That's what I mean by wet and dry test. Wet increases cr, so psi would get higher during the test.

    The v config kinda throws this off, just like out didn't work at all in a boxer engine.
     
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  2. ahl395

    ahl395 Well-Known Member

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    Glad to see compression test came out good.
     
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  3. lxh89

    lxh89 Well-Known Member

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    What's important to remember about positive displacement superchargers is that they move a fixed volume of air. The pulley ratio determines this. The gains one will get from opening the intake, opening the exhaust, etc, all boils down to removing parasitic losses that "steal" power produced by the supercharger. You can only make it so efficient before the pulley ratio becomes the primary power limiter. This looks like an example where you've maximized the blower efficiency; therefore, any other things you do to minimize parasitic losses is shaving fractions of a percent.

    My advise, pulley down if you want more power. You'll find as you turn the blower more, those tiny improvements to efficiency start to pay off more and the blower can be turned harder producing more power with less heat/pump loss.
     
  4. Burkey

    Burkey Well-Known Member

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    The thing that stands out to me is that you’re making 700whp by the time you hit 6700.
    Torque is falling off quite rapidly (which doesn’t seem to line up with other charts I’ve seen)and you’re netting something like an extra 5% power for all the work of the next 1300rpm.
    To my eyes, that’s entirely consistent with a system that has either a restriction in the exhaust or the intake. In your case, I’m going to guess that the 132mm TB isn’t the limiting factor here.
    They flow something like 2200cfm right?
    On the flip side of that, I’d fully expect the 2.25” restrictor in the exhaust to be making things difficult.
    Plenty of exhaust size calculators will predict that you actually need a system slightly over 3” for what you’re trying to do.
    Could be wrong, but damn I’d be ditching that resonator quick-smart, if only for a test.
     
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    Roh92cp

    Roh92cp Well-Known Member

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    I've already ordered straight through 3" MBRP resonators and will be making it a complete 3" system soon. I've never liked that dam 2.25" neck down, but have 2 friends in Cali that have basically the same setup as me except Gen 3 whipple, but pulley, exhaust, 22 timing, but they run E85 and make 790 wheel. I think it will make maybe a small difference, but it still needs to be done.

    My thoughts are meth maybe killing the power so I'm going back to a smaller shot as well. Next dyno will have smaller meth nozzle, 3" exhaust and I'm pulling the lid on my airbox during the dyno and see what it gets. Next run will be 10 gallons of 93 with full can of BOOSTane and no meth.
     
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  6. Burkey

    Burkey Well-Known Member

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    Good stuff.
    It’d be great to see the results from those changes on an individual basis if time on the dyno permits.
     
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  7. jrsimon27

    jrsimon27 Well-Known Member

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    You neef to lower the pulley size for more boost.
     
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    Roh92cp

    Roh92cp Well-Known Member

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    :like:I wish it was that easy.
     
  9. jrsimon27

    jrsimon27 Well-Known Member

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    Here is the deal i have a freind with a 2016 GT auto whipple made on the stock whipple tune 696whp then he added catted headers and pbd tune and dynoed 714whp. He wanted more called pbd and they told him to go with a lower pulley 3.375 was using before the 3.5 pulley. On the 3.375 pulley he had to use vp109 made 750whp plus on an auto.
     
  10. markmurfie

    markmurfie Well-Known Member

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    Headers/removed cats, 4* more timing, a bit higher RPM pull, and a new gen more efficient blower.


    Less than 10whp gain.

    ...140$ pulley would have gotten you more power. SMH.
     
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  11. OP
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    Roh92cp

    Roh92cp Well-Known Member

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    I’m not going to run race fuel to make power on this car daily, it’s a street car. However it is worth a test run with it and no meth to see what happens to rule out meth as the power robbing culprit. As far as pullying down for power, it’s not a good idea with the amount of timing in this calibration. Running a 3.375” pulley would require me to run race fuel all the time, no E85 here, or I would have to lower timing significantly to run that pulley. Power through timing and boost is a balance and PBD has done this many times and knows what combinations of timing and boost make power. This combination I’m running is proven and makes 790-800 wheel all day long on many many other setups. Something is missing or off in my combo and throwing more boost at it isn’t advisable.
     
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  12. Whitedevil95

    Whitedevil95 Well-Known Member

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    Subscribing for updates.
     
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    Roh92cp

    Roh92cp Well-Known Member

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    I've worked on some possible weak links, not sure they were power robing, but they were needed none the less. Looking to hit the Dyno again in August with these changes. Also went down from 20 GPH meth nozzle to 7 GPH and still have no knock and full timing 22 with 93 and 10 oz boostane in each tank.

    Exhaust is now complete 3" no more 2 1/4" chock down to the Borla resonator. I know have complete 3" resonators and I cut out and welded in 3" extension on the mid pipes coming off the from the headers.

    FORE L2 fuel system installed with dual pumps and 1050 ID injectors. This was overkill for sure, but I was running out of fuel at 7800 rpm with BAP and 72's. 58282965289__80B6A3D6-78DD-4BB4-921B-93F17B5E378A.JPG sGinWwJWSTGaUkx5BGHxzg.jpg 4qwb27hUR3mOV5WaxVd5jA.jpg fullsizeoutput_ca7.jpeg fullsizeoutput_cbd.jpeg
     
  14. lx347cd

    lx347cd Well-Known Member

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    Good deal - keep us updated on the dyno. How does it feel on the street? Do you really need to run the meth with the boostane with the 3.5 pulley?
     
  15. OP
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    Roh92cp

    Roh92cp Well-Known Member

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    The car pulls like crazy especially on the hit. I could run more boostane I'm sure and take out the meth, but I'm not giving up on meth, but I will also test with more Boostane and no meth on the dyno to see if it makes power over meth and 10oz boostane.
     
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