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General Supercharger Thread

Discussion in 'Performance and Tuning' started by snivilous, Mar 18, 2021.

  1. Jan 7, 2025 at 9:05 AM
    snivilous

    snivilous [OP] snivspeedshop.com

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    Maybe it's like saying you do sprints when really you go jogging and sometimes sprint. If you go up against someone that actually sprints you get railed, but you both are into running, you just run a lot slower :D
     
  2. Jan 7, 2025 at 9:08 AM
    helidave

    helidave Hellacopter

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    Magnuson 2650 w/76mm pulley, ADS suspension, 35's, misc overlanding bro-trophies
    Blue line is a smoothed out boost reading like you would see on the gauge, yellow line is the raw data from the prolink, which refreshes 12x a second or something like that. Just to illustrate how much it jumps around

    edit: this is over less than a second

    1.jpg
     
    Last edited: Jan 7, 2025
  3. Jan 7, 2025 at 9:10 AM
    Abell207

    Abell207 New Member

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    What supercharger are you running? What size pulley? And what elevation?
     
  4. Jan 7, 2025 at 9:11 AM
    helidave

    helidave Hellacopter

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    mag 2650, 76mm, 7000'
     
  5. Jan 7, 2025 at 9:12 AM
    Abell207

    Abell207 New Member

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    The 7000’ explains why the numbers are so low but you’d think it would raise as rpm climb.
     
    e30cabrio likes this.
  6. Jan 7, 2025 at 9:12 AM
    snivilous

    snivilous [OP] snivspeedshop.com

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    Got a 65mm with your name on it Dave :D
     
  7. Jan 7, 2025 at 9:13 AM
    armyoffoo

    armyoffoo Member

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    Boost should move with RPM, so that might explain the spikes if they line up with RPM
     
    e30cabrio likes this.
  8. Jan 7, 2025 at 9:14 AM
    snivilous

    snivilous [OP] snivspeedshop.com

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    The supercharger spins a fixed amount relative to the crank (crank pulley divided by supercharger pulley). Even at higher rpm the ratio is the same, so the airflow is roughly the same. The difference in pressure at varying rpms is a byproduct of efficiency changes from the aerodynamics as the rotor speed changes.
     
    Abell207[QUOTED] likes this.
  9. Jan 7, 2025 at 9:14 AM
    helidave

    helidave Hellacopter

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    I bet that would be a lot of fun until I went down to Phoenix and blew the transmission to pieces :nuclear:
     
  10. Jan 7, 2025 at 9:15 AM
    snivilous

    snivilous [OP] snivspeedshop.com

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    Good thing it's only 4 bolts to change it around!
     
    HulkSmurf14 and helidave[QUOTED] like this.
  11. Jan 7, 2025 at 9:21 AM
    helidave

    helidave Hellacopter

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    What i really need is the 65 and that smoothboost controller. Then I wouldnt have to change any bolts
     
  12. Jan 7, 2025 at 2:11 PM
    reywcms

    reywcms New Member

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    Too many mods to come
    Think we need to add air filter part numbers to the first page
     
  13. Jan 7, 2025 at 2:34 PM
    Ponderosa_Pine

    Ponderosa_Pine

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    Magnuson Supercharged, Dobinson Lift, 315/70r17 on Rockwarriors, Heftyfab bumper, Dirty Deeds 3” race exhaust
    Well unfortunately I bumped Silver out of the #3 spot today haha!

    First run with new transmission. Was 10.3psi. Flat farm road. Had on 35” studded tires which likely didn’t help lol.

    IMG_5816.jpg IMG_5817.jpg
     
  14. Jan 7, 2025 at 2:38 PM
    snivilous

    snivilous [OP] snivspeedshop.com

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    That's nasty! I need to try and claim 4th spot, this shit of .01s being back two places :mad: might have to drive to Nevada just to get that thiccq air
     
  15. Jan 7, 2025 at 2:55 PM
    NatesNightMare

    NatesNightMare Is what it is

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    Pro comp 7", 35" tires, method wheels, brush guard, light bar, roof rack, pedal commander, magnuson 2650 supercharger
    thays odd because im at 7k and my analog gauge shows a lot higher than his. i also have the 2650 and 75mm
     
    HulkSmurf14 and Abell207[QUOTED] like this.
  16. Jan 7, 2025 at 2:55 PM
    Silver17

    Silver17 Used, but returned and sold as new member

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    Eibach pro 2.0s, toytec progressive mini AAL, ARE CX cap, Airlift bags, Harrop Supercharger, 650cc injectors, 77.5mm pulley, SABM, TRD Dual exhaust, Solid Offroad motor mounts, J&L catchcan, Powertrax LSD, FN BFDs with 285/75r18 Kenda R/Ts.
  17. Jan 7, 2025 at 4:48 PM
    blenton

    blenton New Member

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    When I installed my SC, I was under the impression that boost increased with RPM, but looking at my boost curve, it was essentially flat. I was perplexed and asked around, including asking Whipple if that was an issue. But after a few exchanges, I was made to understand that positive displacement blowers operate as @snivilous explains - a fixed amount of air is captured with each rotation of the supercharger so it becomes a fixed ratio between crank and blower. Changing a pulley changes that ratio and creates more boost, but a good flowing engine should see roughly the same boost throughout the RPM range with a PD blower. I assume…

    Looking at changes folks have made to intakes, exhausts, and tunes, I’m left to surmise three things about boost:

    - a good flowing exhaust and intake will enable a flat boost curve;

    - a poor flowing (I.e. - inadequately sized or restrictive) exhaust will increase boost pressure with RPM simply as a measure of restriction pressure and not power potential;

    - a poor flowing intake will decrease boost with RPM as you run out of air, causing that fixed ratio to droop at the top end.

    Concerning tuning, I suppose there are several things that could affect boost fluctuations, but I think two of the most significant things would be VVT adjustment and timing. Having valves open too early/late/long would cause disruption in flow, poor exhaust pulse timing, etc. More timing typically makes more power until it doesn’t; flirting with that line should yield optimal power which should equate to optimal flow.

    These are suppositions. I am happy to be wrong, but it’s what makes sense to me. Curious to know if I am misunderstanding things.
     
  18. Jan 7, 2025 at 5:14 PM
    Ponderosa_Pine

    Ponderosa_Pine

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  19. Jan 7, 2025 at 5:57 PM
    Tundra Texan

    Tundra Texan New Member

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    None at this point.
    Nice!!!
    Nothing better than that Supercharger Whine!!!!
    It's funny to see the faces of those who dont recognize it for what it is!!
    I left a lot of O faces behind with my 98 Tacoma with the TRD Blower!!!
    It's now time for the Magnuson Whine from my Tundra!!!!
     
  20. Jan 7, 2025 at 6:36 PM
    Tundra Texan

    Tundra Texan New Member

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    None at this point.
    No issues with crap getting past your inner fender?
    Obviously if it's mainly driven on the street thats not an issue.
     
  21. Jan 7, 2025 at 6:42 PM
    armyoffoo

    armyoffoo Member

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    No issues so far, only driven on the street.
     
  22. Jan 7, 2025 at 6:50 PM
    Wynnded

    Wynnded What MPG...

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    :monocle:I'd ask you if you had more than one, but I'm currently running very close to the 5V/512grams MAF max with the TurboKits MAF. Then I'd have to open up the intake, then I'd have to go belt hunting to find the right length scratching the shit outta my forearms again and having everyone looking at me like I'm self-harming.:lalala:
     
  23. Jan 7, 2025 at 7:08 PM
    Mdl

    Mdl Hey there...

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    Ever have one of those days? So I'm taking a few thousandth off the pinion on the front diff. I pulled the rag that had my top pinion bearing which goes flying hits the corner of my engine puller and I hear bearings bouncing on the garage floor. Guess I'm delayed a day or 2 until new bearing shows from down south...:frusty:
     
    Last edited: Jan 7, 2025
    blenton, Wynnded and Ponderosa_Pine like this.
  24. Jan 7, 2025 at 7:12 PM
    Mdl

    Mdl Hey there...

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    I hit it at 5600. I just blindly dump fuel at it.
     
    e30cabrio and Wynnded[QUOTED] like this.
  25. Jan 7, 2025 at 7:14 PM
    Mdl

    Mdl Hey there...

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    Do you set up an account on the draggy? You got me by a tenth...
     
    e30cabrio likes this.
  26. Jan 7, 2025 at 7:25 PM
    Wynnded

    Wynnded What MPG...

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    Seems okay as long as you're seeing the AFRs that you want.:rofl:
     
    e30cabrio and Mdl[QUOTED] like this.
  27. Jan 7, 2025 at 7:28 PM
    Ponderosa_Pine

    Ponderosa_Pine

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    Yes sir! The account setup was pretty quick and you pick what times to share. Tested my 4runner out and it got this amazing result haha (wild to think this is double the time of a Tundra and still faster than my first Mustang).

    IMG_5826.jpg
     
  28. Jan 7, 2025 at 8:01 PM
    snivilous

    snivilous [OP] snivspeedshop.com

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    I have a whole box of 2650 pullies, everyone bought the ones I had so I ordered more and no one ever ordered any more after that :rofl:
     
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  29. Jan 7, 2025 at 8:27 PM
    Wynnded

    Wynnded What MPG...

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    Oh, okay. So my rationalization for buying one is "only" to see if I can get away with the same belt that I'm using for the 70mm. :D
     
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  30. Jan 7, 2025 at 8:28 PM
    snivilous

    snivilous [OP] snivspeedshop.com

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    Order it now so I can drop it off with some other parts tomorrow, you'll also get the new Sniv Speed Shop fridge magnets :rofl:
     
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