Procharger Stage 2 Help With Knock

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

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    5hlucky

    5hlucky Well-Known Member

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    Is that due to the extra heat --> detonation when running more than ~12psi?

    What wound up being the issue the motor?
     
  2. ahl395

    ahl395 Well-Known Member

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    Running 93 you cant usually go over 12psi because yes detonation will cause you to have to retard timing a ton. Not really related to heat though.

    More octane will let you run more boost/timing. Gen 3's have higher compression so cant even run 12psi on the same fuel (but the extra compression makes up for it too)

    My only comment about heat is more time at WOT = more heat = more stress on the rings. E85 does run a bit cooler than 93 does but thats not the cause of ~12psi being the limit on 93.
     
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    5hlucky

    5hlucky Well-Known Member

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    ok, makes sense, appreciate the explanation. so in theory i could pulley down further and log it to see if there's knock retard, and either go back to a 4.25 or run the car with some torco or boostane.
     
  4. ahl395

    ahl395 Well-Known Member

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    Yes you could do that. I would only try it if your current setup maxes the timing on several different tanks of gas. Then pulley down and see how it responds and add torco if needed. Running more than 12 on 93 is risky though and the more boost you run the more risk your taking. You can blow a motor from a bad tank of gas if the knock sensors cant react in time. If you add Torco each tannk you will be safer though.

    The main issue is pump gas varies tremendously. When I was running 12psi I would see a 3 degree sway on timing depending on the tank of gas I had in it. So if you do that I would be religious about adding Torco.
     
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    5hlucky

    5hlucky Well-Known Member

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    OK I'll keep an eye and a log with each tank. The last log I nabbed pulled 1 degree very briefly on this current tank. I'll generally only fill up from Shell or BP, but even then I'm sure there's variances. And like others have done, I can also try and DYI a wastegate setup.
     
  6. ahl395

    ahl395 Well-Known Member

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    Very brief could be false knock if it started adding again after.

    Wastegate setup made a big difference for midrange on my car. It wont help your peak number though
     
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    5hlucky

    5hlucky Well-Known Member

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    Yeah it pulled timing for a couple hundred rpm, and only 1 degree so nothing crazy.

    I'm mostly interested in more mid-range since that's where I spend a majority of the time driving.

    One drawback to a WG setup though is having to switch to the red race valve, i'm not super interested in a ton of noise at idle/cruise.
     
  8. ahl395

    ahl395 Well-Known Member

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    A P1SC is maxed at 14-15psi. The Pro-flo valve can probably handle that so you wouldnt need to upgrade. Otherwise the gate will only make noise after it opens in high RPMs.
     
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    5hlucky

    5hlucky Well-Known Member

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    sounds like one more thing i can test out with just going to a 3.85. thanks for all the help!
     
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  10. whatsup62

    whatsup62 Well-Known Member

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    Correction - the P1SC-1 is MAXED out at 65000 impeller RPM...Boost will vary depending on the set-up. Once you hit 65000 you are not gaining a thing after that. I saw 13.5ish at that impeller speed.
     
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    5hlucky

    5hlucky Well-Known Member

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    what engine rpm did you see the ~13.5psi? from my research with my setup on a 3.85 i'd max out the blower (65,000rpm) at 7500 engine rpm.

    do you have any exhaust mods?
     
  12. whatsup62

    whatsup62 Well-Known Member

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    You are correct - I also ran the 3.85 and 7500 it was done. Long tubes, full 3" to the back, no cats, MBRP exhaust, not restrictive at all.
     
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    5hlucky

    5hlucky Well-Known Member

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    when you say it was "done" you mean you could tell the blower was maxed out?

    man with a full exhaust and 13.5psi you had to be moving some air...my exhaust is still stock and I kinda like it that way, i'd consider some mufflers for a deeper sound but i'm definitely not interested in anything that loud.
     
  14. Jay-rod427

    Jay-rod427 Well-Known Member

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    Shortly after maxing out the rpm the efficiency range drops off big time, and you're just making more heat without little to no gain.
     
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    5hlucky Well-Known Member

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    Minor update...had some runs against a friends 996 turbo that's basically FBO stock turbos. He generally traps 125-127 and has done about 150mph in the 1/2 mile depending on conditions. Pretty consistently he would jump out on me like a car length off the hit and then I'd basically stay even with him through the top of 3 and part of 4. I would have thought I'd have pulled a few cars on him...

    I had a dyno day scheduled unfortunately the dyno operator called me last minute to cancel as they were having issues with the rpm pickup. I know that's not hard data like actual trap speeds or hp numbers from a dyno, but still very telling imo.
     
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