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Thread: Boost lag test, 24.1psi result in 1.074 second.

  1. #1
    turbo addict
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    Boost lag test, 24.1psi result in 1.074 second.

    Since I can do all kind of logging with MS, I thought I would do a boost lag test. Test was done in third gear.

    39.915 seconds since log started, 4475RPM, -3psi (vacuum)


    40.989 seconds since log started, 4973RPM, 24.1psi


    Boost Lag, 1.074 second from -3psi to 24.1psi in 3rd gear.

  2. #2
    Garrett booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Damn man. My SRT-4 doesn't even boost that fast.

  3. #3
    turbo addict Turbo Mopar Contributor
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Directly feeding knock sensor or teeing off?
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0 The Junkyard- [I]Now[/I] - Megasquirt II/Extra. OEM 10:1 3.0 + funny business -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 516whp 519wtq 20psi 91 oct [U]built[/U] 3.0 stock n/a computer [/I] 1994 Spirit 3.0 - 12.3@113 15 psi - Daily :eyebrows: Holset He341 - Now SBEC2 MPflash - 316whp 349ft/lb @12psi 1994 Spirit 3.0 a670 - Wife's - kids building a 3.0T 1990 Spirit 3.0 E.S. 41TE 1993 Spirit 3.0 E.S. 41TE 1994 Duster 3.0 A543 1990 Lebaron Coupe 2.2 TII non IC, T1 31TH 1981 Starlet KP61 Potential driver, 1981 Starlet KP61 Parts, 1983 Starlet KP61 Drag 2005 Durango Hemi Limited 1998 Dodge 12v Cummins 47re 4x4 4dr longbed. No fuel plate. Mack plug, AFC & Spring mods. Boost elbow.

  4. #4
    turbo addict
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Ondonti View Post
    Directly feeding knock sensor or teeing off?
    Neither.
    http://www.turbo-mopar.com/forums/sh...=1#post1131177

  5. #5
    Hybrid booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by tryingbe View Post
    Since I can do all kind of logging with MS, I thought I would do a boost lag test. Test was done in third gear.

    39.915 seconds since log started, 4475RPM, -3psi (vacuum)


    40.989 seconds since log started, 4973RPM, 24.1psi


    Boost Lag, 1.074 second from -3psi to 24.1psi in 3rd gear.
    have a hard time understanding how that turbo can spool that fast...

  6. #6
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Not sure what you guys are looking at to quantify "fast". An SRT-4 stock turbo spools 3x as fast as what is shown here.

    What I'm looking at seems about average for what this turbo with the supporting mods Should spool at..........

  7. #7
    Hybrid booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Shadow View Post
    Not sure what you guys are looking at to quantify "fast". An SRT-4 stock turbo spools 3x as fast as what is shown here.

    What I'm looking at seems about average for what this turbo with the supporting mods Should spool at..........
    That's what I was meaning, on an 8 valve I think that's a pretty quick spool up

    Sent from my SM-S903VL using Tapatalk

  8. #8
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    And don't get me wrong, this is in No way a shot at tryingbe, as I think he's doing an Excellent job of working things out to the point where he should be close to laying down some Good #'s on his set-up.

    If anything, I think this just highlights that Most Struggle to get things sorted out and never seen the kind of success others have had and so it all Seems smoke and mirrors.

  9. #9
    Hybrid booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by Shadow View Post
    And don't get me wrong, this is in No way a shot at tryingbe, as I think he's doing an Excellent job of working things out to the point where he should be close to laying down some Good #'s on his set-up.

    If anything, I think this just highlights that Most Struggle to get things sorted out and never seen the kind of success others have had and so it all Seems smoke and mirrors.
    Me either. I can't data log my Lancer, but I guarantee that it does not spool that quick even with the big valve ported head, ported 2 piece intake, TU exhaust manifold, and triple BB Comp turbo.

  10. #10
    Hybrid booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Just remember, -3 psi is pretty much spooled up already, it'd probably take if he were at 10-20 inHG
    Last edited by EaZyE426; 10-24-2017 at 07:51 PM.

  11. #11
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    What was the start RPM of your test?
    I think what you've shown here is pretty good.
    I'm sure one second feels longer in the car!
    Wayne H.

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  12. #12
    Hybrid booster
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Quote Originally Posted by wheming View Post
    What was the start RPM of your test?
    I think what you've shown here is pretty good.
    I'm sure one second feels longer in the car!
    39.915 seconds since log started, 4475RPM, -3psi (vacuum)
    40.989 seconds since log started, 4973RPM, 24.1psi

  13. #13
    turbo addict
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    I think this will give you a more accurate depiction of what is going on;

    Boost starts, 0.1psi hits at 1554RPM in third gear.
    5psi hits at 2977RPM in third gear.
    10psi hits at 3629RPM in third gear.
    23.6psi in fourth gear at 3993RPM

    Other than that, you'd have to go for a spin and hold it in third @ 4500rpm and nail it to compare what's being shown here. Remember, any turbo that reaches full spool sooner than the "Go" rpm Should be Instant ON!

  14. #14
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    Re: Boost lag test, 24.1psi result in 1.074 second.

    Anyone want to add to Tryingbe's original thread on boost response?

    http://www.turbo-mopar.com/forums/sh...ght=full+boost

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