Procharger Stage 2 Help With Knock

Discussion in 'Forced Induction - 5.0L V8 Engine' started by 5hlucky, May 9, 2019.

  1. OP
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    5hlucky

    5hlucky Well-Known Member

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    #136 5hlucky, Jul 30, 2019
    Last edited: Jul 31, 2019
    Wound up buying a new bypass valve due to another thread where i saw SolarFlare had success with increasing his maf lb/min running a turbosmart...now I'm sure I'll get some static for this but I wound up going with a knock off tial 50mm from Amazon. For $70 it was too hard of a deal to pass up for something I could easily return if it didn't function properly, and in theory shouldn't f'k the motor because if it gets stuck open, well I just don't get any boost. On top of all that I'm just tired of chasing down these small issues as I keep spending time and money trying to figure this out.

    I didn't feel like removing and taking the discharge pipe to a shop to weld on the flange so I improvised by picking up some heater hose from Napa and using the stock port, in essence nothing changed except for the valve. I was only able to make one run/log tonight and I had to cut it short at ~6500rpm tonight, so I don't have data all the way to ~7500 where I'll generally shift, but so far it's better than the stock proflo valve. On average I picked up more boost per rpm, as well as a few additional maf lb/min...that said I'm still no where near maxing the maf out, and I have a hard time seeing it be maxed out even at 7500rpm. Right now I'm definitely at a loss for what's going on with my setup. I threw my log up on datazap if anybody cares to take a peek and chime in!

    https://datazap.me/u/5hlucky/tial-knockoff-50mm?log=0&data=2-23
     
  2. Jay-rod427

    Jay-rod427 Well-Known Member

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    You've got an issue at 6500 or so. Boost drops off a bit, did you partially get out of the gas? Don't have the pedal commanded logged. Also your load is still really soft.
     
  3. sloride

    sloride Active Member

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    477FDE47-B639-49B4-A047-DB59547C762F.jpeg
    I’m running a P1X, 2018 Manifold etc and my MAF and loads seem fairly comparable to 5hlucky at 10+psi. When you say load is soft what should the air load be at 10psi. I was under the impression 1.5-1.6 should be close. I also hear mention of max out MAF. What psi or combinations max out the MAF. Thanks
     
  4. Jay-rod427

    Jay-rod427 Well-Known Member

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    Umm your load is %150-%160, his is %50..... unless for some weird reason his log profile doesn't factor from 0.

    My MAF maxes out at 6,800 with p1x and 4.13" pulley in the heat.

    https://datazap.me/u/jay-rod427/413?log=0&data=1-5-9-10
     
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    5hlucky

    5hlucky Well-Known Member

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    I started to back off the throttle at about 6500 due to traffic, so i'm not terribly concerned with the boost at that point.

    So at this point the load is soft, as well as the continuation of my maf lb/min also being low. I looked at some of my older logs and maf lb/min as well as load are both up a couple points after this bypass valve upgrade, so at least it's trending in the right direction. Is load impacted by what gear the logs are done in?
     
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    5hlucky

    5hlucky Well-Known Member

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    also it looks like both yours and sloride load goes up with rpm, whereas mine decreases...
     
  7. Jay-rod427

    Jay-rod427 Well-Known Member

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    small boost/maf/load increase is likely just different weather conditions from one log to the next. Swapping bypass valve was a waste of time and money imo. You've got a larger issue at play.


    Something seems squirrely in the tune. Your maf and load is really weak, but the maf frequency is about what would be expected. load and lbs/min are calculations from fuel and maf freq. or a hardware problem causing a software miscalculation.
     
  8. Jay-rod427

    Jay-rod427 Well-Known Member

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    agreed it should go up
     
  9. sloride

    sloride Active Member

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    Ah I see the 50%. Not 100% sure what that is representing. His logs have the air load ratio and that looks correct in the 1.5ish range.

    My MAF might be in the ballpark I’m only running the 4.75” pulley. Assuming same diameter crank pulley your spinning the blower 7,000rpm more. Nice!!!
     
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    5hlucky

    5hlucky Well-Known Member

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    not sure if you're directing this to jay-rod427 or me...but i'm on the stage 2 bracketry, pullied down on the p1sc to 4.25.
     
  11. sloride

    sloride Active Member

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    Kind of both. Your airload starts out around .99 and rises similar to mine up to about 1.6. There is a small dip at 6000rpm. Since you’re pulled down a bit is that why you are expecting either/or more MAF and boost?
     
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    5hlucky

    5hlucky Well-Known Member

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    the amount of boost i'm getting seems to be about right for the pulley combo and blower, but the maf lb/min seems to be pretty low, by a fair margin too ~15+lb/min. my next step is scheduling some time on a dyno so i can at least get some hard numbers to match the log data.
     
  13. sloride

    sloride Active Member

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    Yes I’d be interested in seeing the dyno numbers. Not sure how accurate but thrown around a lot is the 10hp per lbm/min. Do you think the car is down 100+hp? Or should be making into the 800+ crank hp range? I’m still trying to dial mine in but hope to dyno it in the next month or so.
     
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    5hlucky

    5hlucky Well-Known Member

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    My gut is telling me the car is making sub 600whp, which would probably be missing roughly 100hp for the setup. Only one way to find out...I'll update once I can get it on a dyno. Maybe the combination of the 3.31 + centri just doesn't make it feel all that fast?
     
  15. sloride

    sloride Active Member

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    Definitely the way to go to find out for sure. Mine has 3.73 gears so don’t have a sense for the 3.31 gears.
     
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